Beast5spdGTA

I'm not talking about all of them, but it seems to me like the majority of sigs I see on here L98s are running between 96-99 mph and these guys have a list of mods. My little 100,000 mile 305 TPI runs 96mph with litte more than edelbrock headers and a chip. I'm just trying to figure out why everyone wants to swap out their 305 to only pick up 1-3 mph in the 1/4. That just plane sucks, I picked up 6mph for less than $500(3 of those mph were for a $70 chip). Just trying to stir up some constructive conversation b/c running 14s just isn't good enough anymore.

MrJ

Since when is a 99mph trap speed slow? Slow compared to what, an LS1? Gimme a ****in break dude, the newest thirdgens are a decade old, and the most powerful ones they made had 245 factory hp. Most non dual cat SD L98s are low 90mph cars to start with. The difference between 92 and 99mph is a lot of HP... like 30-40hp. The truth is, it takes $$ to go fast, the guys who are really serious about going fast are either swapping their TPIs out for Minirams or Superrams, or are going 4th gen. Myself, I plan to keep my car and mod it for at least a few more years, and possibly get a 4thgen somewhere down the road. I'm digressing here... the point is, 96-99 is about average for a lightly modded L98, and there's nothing wrong with that. Speed equals money, how fast you want to go equals how much you want to spend. With these cars, there is a point of diminishing returns when it comes to mild mods, and after that you are looking at spending major $$ for stuff like new heads and the Miniram or superram setups.

BTW, I don't by a 3mph gain from a $70 chip. What is it, an ADS superchip or something?

------------------
91 Trans Am WS6
Bright White
5.0 TPI auto
Flowmaster 3" 2 chamber catback
Trans Go shiftkit
2000 stall converter
ported TPI setup

Built on Wednesday

Tas

because the stock intake choke a 350. Upgrading it is expensive for smog legal stuff. $1200 Mini ram for example. More people should try the $255 Holley multi port itake and try to make it work with stock electronics

------------------
-Tas
'89 Formula WS.6

Got Beach?

Beast5spdGTA

99mph is slow compared to the honda you didn't beat, the DSM(eclipse/talon/laser) that handed you your a$$, old turbo RX7s, MUSTANGS. I'm just wondering why does everyone say junk the 305 when they can't make anymore power with a 350. If a lightly modded 350 goes 96-99mph and so does a 305 why ditch the 305, maybe their just embarressed to get beat by another 5.0. I think a lightly modded 350 w/a cam swap or whatever... Should be running in the 100-103mph range. And yes my chip for $70 from SLP gained me .5 sec and 3 mph. Before the chip I ran: 15.12@92.18, 15.18@92.71, and 15.11@93.65. After the chip (less than 2 weeks later) I ran: 14.85@94.10, 14.69@96.39, 14.62@95.33, and 15.81@94.46(missed 3rd gear) I do intend on running in the high 13s at 101+mph on the stock intake/heads in my 305. These boards are great, I learned priceless amounts of info here, but I feel sorry for that guy swapping out his 305 on a daily driver when he could've been perfectly happy with it and faster than the people with 350s telling him to do the swap in the first place.

JETHROIROC

With the same mods you have, I've seen several L98s 1/2 second faster than you. Are you attempting to defy the laws of physics here? The only reason people fail to make more power with a 350 is parts selection and tuning. Period.

So should I now forget about swapping in a 427 ?


------------------
1990 IROC 350
Mods: Too busy trying to make it run right to mod it.
Airfoil, Dynomax cat-back, MSD coil, 180 t-stat, Bald Eagle tires,
Hypertech fan switch, Accel 23# injectors, Holley module, ported plenum,
Ported Daytona Yellow stock base, Moroso valve covers, other stuff,
Streetdampr, Ruger P95DC, hot wife, new oil filter, !cats, !TBC, !AIR.
18.0 @ 85MPH since I'm one big-a$$ MF
"It's better to have and not need than to need and not have."

fly89gta

iTrader: (1)

hmmmm chip shiftkit headers exhaust and a few suspension goodies 13.89@99mph

bone stock motor haven't lifted the plenum.

Its a fact, you do the same mods to a 350 it will net you better results than a 305. The TPI was designed for a 305, thus it chokes a 350 more so.

sorry but a 14.6 isn't much to talk **** about, my L98 ran a 14.8 bone stock.

Now i don't brag about my times, today's standards a 13.89 isn't all that fast, so i say buh-bye to a SBC hello turbo 3.8 i can be running 11's spending much less $$$ and being WAY more streetable...

------------------
Check out MyGTA Nicknamed:The Big Red Machine
***AOL IM ClarkeMustGoNow***
Moderator at www.transamgta.com
"What does not kill us only makes us stronger"

Tony

90Form350

Because we're stuck with your crappy 305 TPI setup.

------------------
1990 Pontiac Formula 350
Rebuilt 355
COMPCAMS 212/212 .440/.440 cam
Flowmasters 80 series.

Mark 89Formula

Apples to oranges. All L98s were auto from the factory. The 5 speed is worth at least 2 MPH over an auto for the same power level IMHO. Kind of moot since highest MPH doesn't win races; lowest ET does. Most of those L98s running 96-99 MPH are turning ETs in the high 13 to low 14 sec range. If your 305 makes you happy, by all means build it up. It's very satisfying to play giant killer, it's just going to take more money to get the same ET as compared to a 350.

------------------
89 Formula 350, Accel Tri-Ys, 3" SLP, Jacobs, SLP cold air, Probuilt tranny, Vigilante, 3.27s, Spohn torque arm & LCAs w/brackets, GW Subs

Beast5spdGTA

JETHROIROC had the message i was trying to convey here with parts selection and TUNING. I realize my ET is slow and it should be closer to 14.3 if i knew how to drive. I saw a post about what to buy for $1000 and people are putting high flow runners and manifold base ~$300 each, over things like a chip and camshaft. I know some 350s are quick, hell when i ran those times another GTA 350 was running 14.1-14.2 at 99mph with just a cat-back. I think everyone is stuck on this whole manifold base/runners thing, when i don't believe it's the restriction until at least high 13s and 100 mph. These guys should be saving that $600 and getting a set of heads for that price. I know that there are plenty of 350s runner faster than myself, but there are also plenty(seems like about 50% of the sigs) that run very similar MPH to me with more mods. Just stirring things up a little and i think my 305 will be more cost efficent(spell?) until mid 13's N/A. Since I don't own a 350. After that then I agree a 350 would/should be needed to go faster w/o breaking the bank, but so would the crappy TPI that we're all stuck with(damn long intake runners to hell)

ImportsRsloths

I agree with Beast.... people are always preaching go 350 when then have a perfect 305 for a decent buildup (and when they swap the 350 all the stuff they did will just be that much more beneficiary) They need to say **** runners/manifold and say swap 2.73/3.08 gears for 3.42/3.73 and say **** little peanut cams cheap ZZ3/ZZ4/LT4 or anything else to gain power.... gears and a cam will make you decently faster than a 350. ANd about the MPH here is proof that a auto mph is slower than a manual..... he lost 3mph from the swap... http://www.discussion-board.com/Grea...ML/001604.html

Ed Maher

Actually, in a way beast is right. Of course you guys with good running cars are taking offense. He's not talking about you. If you look around though, there do seem to be a bunch of folks who aren't running nearly what they should. Like he said, head/cam 350s running 99mph or so. That is sad, and i'd say is very rarely due to it just being old and worn out.
Thats one of the great things about these boards though. Hopefully, people learn by example. Just hanging out for a while and you should be smarter about your ride.

------------------
Ed Maher - Moderator @ The TPI & Carb Boards
92 Z28 Convertible - Quasar blue / Tan top
305 TPI A4 2.73 - 14.7 @ 93.6
Stock except ported plenum and dual cats
-=ICON Motorsports=-

- Definitely prototypes, high powered mutants of some kind. Too weird to live, too cool to die

mckenzie

Hello all. i have a 86 iroc with a 305tpi. rebuilt motor with a mild cam. haven't been to the track yet, but i'm very happy with the results from a fresh engine rebuild. if i was really worried about big hp, i would remove the tpi and go carb. i like the way the tpi looks and runs... best of luck.

------------------
86 iroc 305tpi auto. mild cam

8Mike9

Hmmn, never thought anyone would have to explain "why"...

One word -potential-

When your 305's time is up, and you want to run low 13's/high 12's, what's the easiest, most cost effective way to do it? Well, start with cubic inches.

I do agree, I see no reason in the world to change from a 305 to a 350 ... and leave it at 230 hp, unless the cost of the 350 is less (most likely is too?)

Now what would you do is you were shooting for 330hp for you build? Wanna be different and rebuild a 305 to 330 hp?

Dollar for dollar, you'll make more power with cubic inches.

Kevin91Z

iTrader: (1)

There arent any speed density L98's with a single cat. All 90-92 L98 F-bodies have dual-cats standard. And they should all be running mid 14's at 97 MPH at sea level with traction.

Every 1 MPH is about 10 HP. 99-92 = 7 = 70 HP. But thirdgens dont use horsepower, they use torque. So yah, you're right, its about 30-40 HP.

The difference between a stock 89-92 dual cat 305 5-speed and a stock 89-92 dual cat 350 automatic is only a few tenths and a few mph. But as you start modding them, the difference becomes greater and greater. I dont know anyone who would replace a 305 with a stock 350. Why bother? Unless you're cheap.


------------------
1991 Camaro Z28
5.7L 5-Speed (originally 305)
317 RWHP, 418 RWTQ
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Member: SoCal F-Bodies
-=ICON Motorsports=-

Bird_of_Prey

put a blower on a 305 and there you go, a 5.7 killer that's not 4000$ to build..
my way of thinking.

------------------
87 formula
LB9, Automatic
K&N
3" catback v-force muffler
Hypertech preformance chip

fly89gta

iTrader: (1)

See the problem is doing upgrades in the right order, buying nice flowing heads IMO wouldn't be the first thing to do on a L98, yeah its an upgrade over the stockers but the TPI in stock form would still choke them. Case and point:I know someone with an 89 Iroc Edlebrock aluminum heads, ZZ9 cam and a few other little things but threw the stock TPI back on and can only turn a 13.7, now with those heads and cam he should be runing A LOT quicker than that, if he were to updgrade some of the intake components he'd fly.

Now i'm sure are gonna say "Well you didn't touch your intake before doing all the mods" You're right, i never got around to porting my intake or anything, i have all the means to get the air out, just not in, though i'm VERY happy with my times, i'll probably port the intake and see if i can drop a few more tenths before i go to the dark side of the turbo 3.8 world.

What helps you is your combo, i don't recal what year your car is, but if its 88-89 the 305 T5 combo got the L98 cam which is nice for a 305. As stated before with a 5speed your trap speed might be a mph or 2 higher than an automatic with the same ET. Also keep in mind that a LB9/T5 and a L98/auto had almost the same ET down the 1/4 strip, this according to GM's "official" times. Now if u had a 700r4 behind that LB9 thats a WHOLE different story

drain89

iTrader: (10)

Beast, I see now where you were trying to go with this, I would suggest being more tactful next time.

[This message has been edited by drain89 (edited October 21, 2001).]

u r sofa king we tah did

not all of them are slow though. the difference between two stock cars can be like night and day. ive drove a few L98 thirdgens that were stock, and some of em just felt like pure dogs. mine with the 2.77s felt faster than a couple of em i drove that had the 3.27s. it just depends on the car. bone stock, my car turned a 14.3 at 98, and my corvette L98 bone stock, ran a best of a 13.8 at 101, but building a 350 to replace a 305 is very logical due to the fact that it will produce more torque cause it is bigger, and it costs less to build than a 305

GofasterFirebird

iTrader: (3)

When I put an L98 with an exhaust behing my five speed it went 14 flat at 100.5. My bone stock 305 tbi went almost 90 in the quarter. When you realize that even with a power adder you probably will still be in the 13's, a 350 starts to look a bunch better. Go times for a 305 though.

Kevin, I know you know what you are taliking about but tpi engines do use hp.

------------------
1991 Firebird
350 L98 (was a 305 TBI),T-5,Edelbrock TES and cat back,Accel manifold
NOS,subframes,jegster torque arm,MSD Digital 6
AFPR,Lakewood lcas
Hurst linelock,SLP cam (206 212 .480 .486),relocated battery,cold air,Hypertech chip,centerforce df,clutch
poly bushings and mounts
AFR 190s
Harland sharp 1.5 rockers
autopower rollbar

12.33 @ 114.83 juiced uncorrected

13.510 @ 102 non juiced uncorrected

IROCZTWENTYGR8

iTrader: (1)

There are some FAST stock L98's out there dude.

------------------
89 RS

STILL Looking For:
An 87 IROC-Z28 350 TPI

Yeah I have an RS, but I want an IROC-Z!!

MrJ

dude you read my post wrong. I've been on this site for what feels like forever. I know that there are no single cat SD L98s, I don't need anyone to explain that to me. What I said was 'non dual cat SD L98s'. In other words, non SD L98s.

Rob P

iTrader: (1)

I think you have a point. My L98, 3:23 posi rear/auto with totally ported stock intake, runners and plenum, underdrive pulleys, alum drive shaft, stock dual cats, adj FPR, home made cold air and some suspension mods ran 13.81 @ 98.96MPH. My 305 TPI 92 Z28 5spd convt with a like ported intake, plenum and runners, hollow single cat ran 14.21 @96mph with an alum drive shaft. coolant bypass and 3:08 rear.
No adj FPR, and I never touched the timing.
The 305 put 220 to the rear wheels on the dyno at Super Chevy in Gainesvillea. Not bad for a motor rated at 205 flywheel from the factory. The L98 had about 45K and the 305 had about 20K when run.
So my 305 is not far behind my old 350 TPI with no suspension mods etc. I think if you modded both equally, the race would have been very close, perhaps even the 5spd equipped 305 coming out in front.

------------------
Rob P
89RSconvtZZ4TPI Edelbrock Intake
SLP Dual Cold Air Intake 1 5/8" Headers Semi-Siamesed Runners, IROC
suspension, alum shaft. Numerous mods.
92Z28convt5spd (stock)
71Impala convt 402BB
BETTER DRIVING THRU SUPERIOR HORSEPOWER!

[This message has been edited by Rob P (edited October 21, 2001).]

[This message has been edited by Rob P (edited October 21, 2001).]

Z03Z28

You do know that the auto weights
more than a 5 speed car.If you put a 5speed on a 350 you'd see a whole new outcome.
Also the TPI was made for 305's not 350's.
No one should get rid of they are 305 if they are happy going hi 13s & lo 14's.But
most people who mod there cars tend to want more than 13's be it hi or lo 13s.

Drakar

Also autos in general are far more parasitic then T-5's so we lose power there.

------------------
1989 Trans Am GTA

Beast5spdGTA

Most people tend not to get to 12s N/A regardless the money the shell out for miss matched untuned combos. I'm not saying all and I'm not saying I won't be one of those people stuck in the 13s, but I do know I won't shell out $$$ for a superram or LTR pieces only to get stuck in the 13s.

CobraKiller

My L98 which doesn't have many mods has run a best of 13.8@104 mph and that time compared with the mph to me is saying my car still has a better run than that in it now. If you've got a good L98 in good shape it's gonna put up some good times,no way around it unless you got some factory mutant.I'm not trying to say my car is extremely fast by today's standards but for the money i've spent if I put it into a 305 I'd have half the results maybe posting a mid 14 if I was lucky or a low 14 with a 5 speed and gears which I don't have..GM went wrong with the 305..peanut cams..restrictive intakes which have a small powerband(same for the 350). And a ford motor with similar displacement can walk on alot of 350's...It's all in the engineering in most cases.


------------------
"Turn a 12 second dream into a 10 second reality"

406 SB coming soon..

Kevin91Z

iTrader: (1)

Willie and Tim Burgess are the only blown/nitrous 305's faster than me that I can think of. And I certainly havent spent $4000 to build my 350.

MrJ, I didnt mean to correct you like that, I was simply adding more info to your post for those other people who would get confused. Yah, thats what I was doing...

88blkiroc

I have noticed that there are a lot of L98s on here that are a heck of a lot slower then i am with a bunch more mods. Is it driver? Is it bad combo? Is it traction? who knows. cars are too unpredictable. you can have a big HP variance between 2 cars with the same mods. I think that people do the wrong mods a lot of the time on L98s though. Biggest things that i would point to that make a fast L98 are great exhaust, trans, ignition, and suspension. Like every quick L98 i see has these 4 things done and they all move very well. I see a bunch of cars that have heads, cam, intake, etc, that just dont move cause they forgot about the basics. You have to make sure your **** matches and then you have to make sure your car hooks.

------------------
1988 IROC-Z L98
Engine Mods:
Edlebrock TES Headers, Hypertech Chip, Flowmaster Muffler, Intake Airfoil, AFPR, MSD-6A, MSD Blaster 2 GM Coil, bored .030 over.
Nitrous System:
NOS Dual Fogger Nozzle Setup, Jetted @ 150hp.
Suspension Mods:
Lakewood Traction Action Lift Bars, Hal Rear Shocks
Trans Mods:
2,500 stall converter, Redline clutches,Heavy Duty Steels, Trans-Go reprograming kit, Heavy Duty 2-4 band, Corvette Servo, B&M Mega Shifter
ET: 13.833@99.30 N/A
No Juice Times Yet.
"Man you should put 2 bottles in, youd go faster" Nitrous advice from a 12 year old Fast and Furious fan.
www.mfba.org

quickL98

iTrader: (2)

my car started its life as a 305, i ported the heads, plenum, added, headers,slp,cam,gear,and a chip, and my 3800lb LB9 GTA beat a couple of LT1'S, surprised alot of LS1er's and never gave me a problem for 2yrs, the quickest 305 i've seen was a 91 Z it ran abest of 13.50 with 150K on the stock bottom end a cam and gear with headers and a chip...is this car an X-file? nah...just a exp driver, but i cant agree that 305's are faster, the negative affects of a tpi intake arent as magnified on a smaller motor ...wow your car runs 14.2's mines runs 14.2 @96 with a busted converter and 12.90's on radials @110 as best so far.
i was all about my 305 too .... but then i got tired of having to only race stock cars
nowadays a quick streetcar runs 6.90's !in the 1/8 there are bolt-on LS-1 cars running mids 7's at sunshine...yeah ....WTF is right ! i regret ever fixing my car everytime i see that szhit!

------------------
87GTA ,10.5:1,4-bolt 355,afr 190's, super ram ,stock poerted base,58mmTB,24 lb FMS inj. ed wright chip, .510/230 (nr) 1&5/8 hooker shorty's, flow master single 3", 2800 ameri-torque non lk-up, 3.73. best to date with stk 48mm tb and lack of traction in 1st gear netted me a 12.9 @110mph /91 TA daily driver LB9 A4 2.73

Greg90iroc

yes there are SD l98 single cat cars. I have one. well it used to be a dual cat but i went to a single cat setup because. i had originaly bought the exhaust for my RS and then i bought the iroc and guess where the exhaust went. oh BTW there is really no cat it is a mac offroad pipe.

------------------
90 IROC l98
last season best corected 13.62 @102
mods
full exhaust, AFPR, pulley, jet stage 1 chip, billet servo, 52mm throttle body, slp runners and some 1.6 RR's and a few other little things.
243 RWHP and 342 RWTQ with hot engine and 90 octain fuel

1991tealRSt-topGuy

try driving a 3.1



------------------
Slayer of the following:
1996 Riced-out Honda Civic (all show and no go!!!!!!)
2000 saturn
198? Ford Crown Vic, (no i don't know why he bothered)
1990 Buick LeSabre 3.8
1986 Camaro 2.8
Newer Ford Explorer
Food that makes me sick: RICE
1991 Camaro RS 3.1 V6 5-speed
1991 Z28 Rims with Firestone Firehawks
dual snorkel intake w/ slashed boxes, 2 K&N's, 180* t-stat, 80 series Flowmaster (sounds AWESOME)
my motto: I CAN'T DRIVE 55

RedFirebird

It all depends. Stock a 90-92 LB9/5-speed might be as fast as an L98/700r4 combo, but you have to take into account that the LB9 cars have the benefit of a manual tranny while l98 are bolted to a slushbox. I'd also assume an lb9/5-speed drive train is significantly lighter than an l98/700r4 combo. The LB9's can be nice and quick with a few bolt ons, but if you're specifically looking to knock down your ET, the L98 has much more potential. The carbed 305's are junk. I just got an l98 vette and its like night and day in comparison to my formula performance-wise.

------------------
Red '87Formula Firebird
-mostly stock 5.0L LG4 w/cowl induction setup borrowed from '83 TA and T5 tranny.

My newest Ride:

'85 Silver L98 Corvette w/4+3 manual tranny. not bad for $3500.

Kevin91Z

iTrader: (1)

Why did you post this? You said yourself your car was a dual-cat 90 IROC, so thats pointless. I dont go around saying my car is a stock 350 5-speed.

Sorry to be blunt. :-P

Beast5spdGTA

Kevin91Z I hope that guy understands your point, it's comments like that one he made, that start those rumors. should've deleted his post, then said you were sorry.

1988camaroZ

U have to experiment with the tpi cause surtin things do differntly for other cars like porting the intake made my friends 88 formula slower by a 2 tenths on the other hand i ported mine and it was good for 4-6 tenths so some things work on some cars and others it dosent....

pontiac

agree with Beast5spdGTA. 350 is slow. maybe it's due high weight and torque orientated LTR design? but i'm happy with less hp and my GTA has proved to have enough power to manage in normal trafic situations without problems.

for sure i'd like to have lot more power, but i just have to find a way to survive with car i already have.

peace,


-P


------------------
Pontiac Trans Am GTA'89

CC1 GW6 G80 JG1 L98 MXO N64 WS6 822

mods: firebird '89 four spoke steering wheel and i'm still not running low 13's yet!

Little GTA

No seems to have mentioned the fact that these 5 speed cars have a higher ratio rearend 3.45 or 3.42, or 3.73 in some cases vs the 3.27, 3.23s. Helps in the torque difference b/w 350L98 and 305LB9

All things being equal though, what idiot wouldn't want a 350 over a 305?

I personally have an L98 350 w/ auto...and will be purchasing (*** Willing) an LB9 5 speed GTA this month. Now I will fill more comfortable stripping my L98 GTA and throwing the kitchen sink at the motor, yet at the same time have the luxury of driving the manual trans. car to appease my control appetite...with a power adder of course...the quick, easy way to overcome cubic inch deficiecy disorder.

------------------
89 GTA Trans Am L98
Wins: 2 Early 90s Stang GT, 4 wheeler, Chevy Malibu
Losses: New Camaro...bastard

lancer5067

Weren't the L98's originally equipped on the 85 corvette?? In the eyes of GM the 305 TPI was a sissy spin off of the vette and was never in the mix for the TPI design.

------------------
'89 GTA
5.7L TPI
Bright Red w/T-Tops Edelbrock Headers
Edelbrock Catback

fly89gta

iTrader: (1)

formul8!!

I'll argue that. A friend of mine had a rear drum brake,single cat '92 Z28 with an original L98.

bigals87z28

hey fellas... i have been askin a lot of questions because im new at all this.. i have been reading like a savage about my car and what i can do... i usualy come up with the same stuff every time... it can only be used on a carb engine... can someone please tell me a good EMISIONS LEGAL cam and heads..im lookig to build up my 305 hey ive beatin out many of a-holes trying to race me... and i just want to totaly put them down.... i plan on doing things that are basic kn cone filter, 58mm tb, 180 t-stat, runners, headers, and cat back exaust... if someone could just tell me what i asked for... that would be fantastic... thanks

camaro6spd

Dude...hat is it with people and thinking they need a large TB....Your stock one is fine....and a 52 at the most. 58 is way overkill....If you want a strong 305 start with bringing up to specs with stock...new plugs wires etc. Then get a Cat-back...then port the plenum and get some runners, then headers...then try a chip....hopefully you can get a custom one. That should get you in the 14s. The 180 T stat does not offer any measurable HP....58 mm TBs (when all you need is the stock 48), a bunch of small $5 items suck as T Stats and stickers are what ricers do. Don't think that $5 is gonna get you 5 hp. I wish a 1 hp was a dollar...I could be pushing 1500 by now.

tpi_roc

Take it easy on him, he said he's new.

Not only that but I'm sure that even YOU learned the hard way about what parts NOT to buy. We all come from somewhere and he's coming from the begining.

berlinetta85

Speaking of new to this, I've got a dilema. I just tuned up my 89 350 bird with new spark plugs, accel super stock wires, accel cap & rotor, and a K&N filter. Also switch to pure synthetic mobil 1 oil & filter. The car is running great. The tranny is getting upgraded with a trans-go shift kit, 1qrt deeper pan with cooling holes, new filter & gasket, TCI flexplate, and a TCI 1900 stall converter. That should wake things up pretty good, but what do you guys suggest my next move be? Besides an exhaust system. Thats a given. I'm looking to be knee deep in the low 13's. I could use the advice as I'm new to the game as well...

nblanchard

Quite a little argument going on here. I have on ly one answer... which has been said already. GM put a system designed for a smaller displacement engine on the 350cid. Its like the old 2BBL Carb setups on 1970's 350cid's. Power gain is directly related to volumetric efficiency. If you set the engine up to pull more air in, its gonna push more out, thus people putting high lift cams and better flowing heads, then keeping stock manifoods and intake's.. totally defeats the mods internally (cam, heads etc.)

My game plan is to get the engine running as effecient as I can without messing with any internals. Come next season, My plenum will be ported, injectors flowed, blue-printed and matched, and computer chip installed. (really should get headers, butt thats a huge expense) And the most important mod in my view, boxed control arms and poly bushings. leaving stock suspension in the rear robs quite a bit of speed and ET from your runs. So, ultimately, I hope to be in the high 13's low 14's.... I may get the Edelbrock TES headers.. I don't know yet... If so, I want a 13.5 for sure... and I will tune and tune until I get it!!!! I am determined.. hehe



But... I agree with beast, stock, it was kinda slower than what I expected. But its still fun to drive.

------------------
1988 Pontiac Trans Am GTA L98 5.7L, Black on Black with 114,000kms.

Best ET 14.559 @ 95.25MPH
Custom 3" Stainless Exhaust Y-Pipe back (High flow Cat and Flowmaster Mufler)

ChevypickupTPI

Personally I havenever had any problem waxing any 305 in my 355 GTA, Still didint have any problem getting 2-4 cars on a 305tpi car when it was stock.12.93@114mph


[This message has been edited by ChevypickupTPI (edited November 29, 2001).]

deadbird

My Formula 305 5-speed has 3.08 gears. I can't speak for camaros,, but, from what I understand, the formula 5-speed 305's got the 350's cam, which is what made them run better than the auto 305 and close to the performance of the 350 autos.

------------------[*]my Formula Homepage [*]Collision P/Ns & Diagrams

"Always do sober what you said you'd do drunk. That will teach
you to keep your mouth shut."

anesthes

iTrader: (12)

I think everyone is missing the concept and
hobby of building hot-rods.



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1989 Formula 350 4-bolt mains, Forged .030 TRW pistons, SLP 51010 Roller Cam, Comp-cams roller lifters,
Summit 1.5 roller rockers, World Products Sportsman II 2.02/1.60 heads, Edelbrock TPI Intake,
Cloyes Double Roller timing chain, Mellings oil pump: 13.5 @ 100.23 MPH

Since close of track : Ported SLP runners, Ported Plenum, AFPR, Autometer 100lbs F/P gauge, A/F ratio gauge, MSD 6AL.

http://www.joesperformance.com

Beast5spdGTA

I was just trying to push people to improve the speed of their cars a little (maybe myself) and I really hate the people who tell guys with 305s to swap in a 350 as the only way to go fast. I see a lot of slow L98s and wonder why? Hell I beat a late 80's corvette last weekend, makes me wonder, I had to embarrass him a 2nd time b/c he couldn't believe I had a 305. I don't see why a L98 should be a high 14 sec or even a 15 sec car unless it's completely factory stock to the airfilter and exhaust. Tonight starts the cam swap into my car... 13s in a stock appearing 305 are coming LT1s beware. I know it's winter in areas other than FL, maybe get you fired up to do some mods to our cars. I just don't like seeing 3rd gens getting beat by imports. I'm glad the "swap in a 350" talk seems to died out some.

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14.62@96mph headers, muffler, chip, ghetto stuff, duct tape
89 GTA 305 TPI 5 speed 3.42 gears

87irocz350

DUDE, YA KNOW WHAT. I BET IF YOU RACE ANY HERE WITH A GOOD RUNNING L98 IT WOULD STOMP ALL OVER YOUR 5.SLOW