Nasty_Bird_'90

are the TPI 305's capable of mid to high 13's with a cam and bolt ons? i want a 350, but i can get my hands on a 305 now. i want a good street/strip daily driver. can i get these times with a 305 with a cam, full exhaust, afpr, and other bolt ons?

new87

Yes, you are going to ethier work the stock heads or go after market. Gears and stall will help alot also. Lighten the car any way you can.

Hg

From what I've seen of people's 305 times on here, I figure with heads, cam, new intake(large tube runner, edelbrock base or the like), exhaust, CAI, etc, good tranny, stall, gears, pretty much all out, I figure 13's are possible for a 305. My plan for my LB9 is:

Vette Al heads
SLP cam: 51006
slp cai
58mm throttle
Edelbrock base
SLP runners
1.6 crane gold race rockers
hooker headers 2055
hooker catback
shift kit
saturday night special stall maybe?
3.42-3.73 gears, haven't made up my mind
LCA's, misc. suspension to get power to ground...
fast chip

Hrm... am I missing nething....

bjankuski

Yes it is possible to run 13's with a 305 and it can be done with bolt on's. My 305 has a stock cam, stock heads, stock manifold, stock runners, stock throttle body, and 112,000 miles on it and it run's 13's. My mods and times are in my sig.

brian89transam

Yes. I would say it's easily possible. Do all the free stuff first- like CAI, etc. Then ignition tune up and exhaust, headers, highflow or gutted cat. I would even do the cam before the major intake components. Gears would help a lot too if you have 2.73s or 2.77s. A new intake and runners will be very expensive unless you port them yourself, and you won't gain very much from them, even in a 350.

350s and 305s have the same size throttle body and a larger throttle body isn't needed on a 350 until you're well into LS1 range. Having too big of one will hurt your throttle response.(especially a 58mm)

If I were you I'd do the free stuff; ignition plugs, wires, coil, cap&rotor; cat-back exhaust; cat; headers; gears; rear suspension upgrades; and a 75hp shot of NX nitrous. But that's just me. Forget about the 350 and go for it.

Bort62

bjankuski



something dosent sit right with me on your combo


What does your car weigh 2500 lbs ?

Ed Maher

Don't be a hater Ian. There are such things as freak cars, and bjghjgghk sounds like one of 'em. I believe in things like 14.0 1LE cars (both engines) and an 88 formula 5 speed ain't doing too bad.

But really though. 13s are completely within the grasp of any 305 as long as you get it running right. With a basically stock parts engine I'm way into the low 14s, and that was with a screwed up tranny. Between the vigilante converter and fresh tranny i have waiting to go in, as well as a stock base that i'm working over i should be able to get my *** kicked out of any track around here (acn't run 13s in a vert without a cage)
If i intended to go to the next level on this 305 i'd run some used vette heads w/ guideplates and 1.6 rockers. And a big adjustabale shot of nitrous. Rag the 305 way into the 12s at the track, and in a year or 2 make way for a real engine. Maybe i reuse the vette heads, maybe i sell 'em. But i need bodywork before i think of the cage....

LimaBravoNiner

I'm going to try and get there too...

My car is a 93k mile 89 Formula with the factory 305 TPI/T5/3:45 9-Bolt combo. I'm hoping this car is a freak also. Haven't had it to the strip yet as I just bought it last fall after the track closed for the season. It's kinda light-weight (no T-tops) but it does have A/C, PW, PL, PH, etc.

Even with bad intake gaskets (which I'm replacing this weekend) it pulls pretty hard. Only previous -owner mods are a K&N, gutted MAF, and a Dynomax cat-back. SOTP is pretty close to the stock mid/low 14 second GN that I sold last summer.

After finishing the gaskets and a basic tune-up, I'll be hitting the strip for some baselines and to learn how to drive and tune it. Next step would possibly be the L98 Vette heads, ported early intake, and ZZ4 cam now sitting on my workbench. When I'm bored with that, it'll be time for the rest of the ZZ4 currently hanging on my engine stand.

I was going to go with the ZZ4 or a 383 right now, but the LB9 is running so good it has me curious...

Bjankuski, you have given me a goal. :hail:

Oh ya, almost forgot. This car is my 365 day a year driver.

Nasty_Bird_'90

well i have most of that stuff on my L03 now:
highflow cat, 3" catback with flowmaster 80 series, 3" K&N open element, MSD cap, rotor and 8.5mm SC wires.

heres what i plan on doing-either 305 or 350:

cam, headers with big y-pipe, 3.42 gears, b&m megashifter paired with a transgo shift kit.

will a cam and headers get the 305 into the low 13's in addition to what i have now?

SnkSknrZ28

iTrader: (2)

ya its easy like that other guy said with just bolt on's, u dont need any heads, cam, no nothing.. my LB9 stock was running 14.8's in the quarter, now as u can see in my sig i have alot of bolton's, i haven't had it to the track with them yet so i dontt know what it'll do but i bet i'm in the high 13's with is, i raced a couple of LT1's which generally pull 14.1-14-3 in the quarter and i beat them by like two car lengths, and we shut down at 80mph, in the quarter i'll be running closer to 100mph so with 20 more mph i would have at least anouther car length on them which should be some pretty decent times at the track.. plus when i run the NOS i'm planning on dipping into the 12's with just my stock bottom end and stock gears inthe car.. MUAHAHAH!! bring it on LS1.. but my car only has like 34k miles on it still, shes just broken in!! lol.. good luck, mike..

SnkSknrZ28

iTrader: (2)

OH YA I FORGOT, its also only an A4 !!

Ed Maher

You're on the wrong board mate. This is the TPI board, not TBI.

And no it will most likely take a bunch more than what you have listed to get an LO3 into the 13s. Your stock heads are as bad a head as you could possibly have so they have to go. Beyond that, actually tuning TBI to make any power at this point is all about voo doo magic and nothing about skill or hours invested. Some people can get a TBI car to run almost what it should, but the vast majority are at least a second or so behind where they should be given their work.

Bort62

Not a Hater, Just Skeptical )

bjankuski

Bort62, My car weighs 3375 and with me it weighs 3575. I drag race my car every weekend in the street class and it will consistently run high 13's to low 14's depending on the weather. The mods I have listed are what has been done to the car, it runs very well for a 305. I am currently installing a ZZ-4 cam and vortec heads and intake, with those changes I am hoping for mid to low 13's, time will tell.

Jim 86 IROC

bjankuski, that's some good driving; you're ETs are where they should be for that trap speed.

BTW, from your trap speed and weight I calculate that you're making about 255hp at the crank (about 10hp more than my 3800lb IROC!). With such a light F-body I'd say you can be in the 12s on the motor with some serious $$ mods.

Try a 160 deg stat & fan sw and cut back the spark plug ground electrodes for some "free" hp. These should be worth another 15-20hp; should get you to about 13.5 @101mph.

If you do time slip comparisons be aware that weather conditions can make a difference of 1-2mph at the big end.

Bort62

Good Call Man. Im impressed that you can Get that much power out of the Stock Manifolds. But then again, Im right Behind ya...

My best trap so far is a 98.6, So In theory I can bust myself into the 13.9 Range, But Traction Is the limiting Factor.

With those Vortec Heads, cam, and intake, You should See some Definate improvement. But Why Not Go with some SLP 1-5/8 or 1-3/4 First ?

The Stock Manifolds are really going to Hold you Back.


I think a 13.4 Is possible out of the stock Shortblock and heads, Myself. Especially if We have this guy Running high 13's on stock exhuast manifolds.


With reasonable street Manners. (no 5.13 ring and pinion)

But enough about 305's