z28monster

iTrader: (1)

hey guys a while back i was informed by soem on ei think that my car would do 146 or so MPH off of the floor when brand new... is this right?

no i havent had the chance to realy max out my car but i have opend it up a couple times and i realy dont dout that it it could hit 146 MPH at all....

any way there are all kinds of peeps over here that dont believe a word i say when i try to tell them that my car will do close to 150 mph off of the floor....

it has :
engine: LB9 "305" TPI
tranny: 700r4
rear end: 323s with factory "posi"

car also has 4 wheel disc breaks and all the other bells and wistles you could get back in 86... pretty much this iroc of mine has evey option you could ever want in 86....

any way is there any truth that my car or ARE cars will hit around 150 MPH from the factlory?

id like to hope so because i have had my car dam near close to it and it was still gaining speed....

im told by every one no way your speedy isnt accrate any way blah blah blah.... but i have stock size tires, stock speedo, stock speedo gears .... so nuthing drive line wise has been changed so best to my knowledge it should be right on....

any way what kind of top speeds have you guys hit with your nearly stock cars?
i know its not safe to go that fast but hey they didnt make are cars to go slow... and yes i know there is a time and a place for that...

what i realy want to know is if it is true or not cause i have a family member that wants to bet me soem money that my car wont go that fast and he is going to have his wife who is a state trooper clock me with her radar gun at and old air port i guess.... so i dont want to go through with this untill i know for sure i can do it and win the bet...... i win the bet at 140 MPH anything after that they are just going to gibe me tat much more respect.... because they dont think it will happen cause its an 80s camaro and they are real american muscle blah blah blah they say so i want to prove them wrong....

help me out guys...

kairles

iTrader: (2)

I have basicly the same car as you when I still had my lb9 and had my built tranny I went 145+

z28monster

iTrader: (1)

thats what i thought.... that mkes me feel much better but i asowant to hear from other on this one too.... like i said lol a friend of the family is going to have his wife that is a trooper clock me with her radar gun in the spring to find out who is truly the winner of the bet... because they dont want to go by my speedo cause they dont believe it is accurate just because my car is old....

i do realy believe in my car though that it will be able to touch that type of speed.... ive had it doing 140 mph before and it wanted more but the road wouldnt allow me to keep trying to top it out so i had to let off.......

BORLAZ06

i hit 150+ with four people in my car...the needle was PINNED!

anymethod

You should be fine then if you've already hit 140mph. Only thing you can do is check the speedo for accuracy. If I had the chance to run at an old airport I don't care if I topped out at 100mph or whatever speed I'd do it anyway.

~Matt

ShiftyCapone

iTrader: (7)

It will be close. Your speedo is off as is every 90's and 80's GM speedo. The faster you go the more it is off. You are going to need a lot of runway.

pvt num 11

I've never been that fast, I let off at 104 (if the digital GTA gages are any good...) but the car was starting to get a bit squirrely - I've never had issues around eighty or so, but I guess having a good suspension and correct wheel alignment starts to become a strong stability factor when you get gong faster. I would also hate to see a worn-out tire disintegrate at those kinds of speeds, I can see a car flipping if the driver lost control at 140+... Not a pretty mental picture to contemplate.

ShiftyCapone

iTrader: (7)

I agree. One should really make sure their tires are rated to sustain speeds that high. You should also consider a drive shaft loop. Your steel shaft will be way beyond its critical speed and can break off sending you flying end over end.

pvt num 11

I've seen a driveshaft snap, but it was becasue the mega-tard was doing neutral-drops from 4500 RPM (his '96 3.8 Camaro was DA BOMB, yo!) and lo and behold something snapped - differential yoke flew apart.

What's the typical critical speed for a stock steel driveshaft, anyway? Would it be wise to upgrade to aluminum? (Aside from the other benefits, like less rotating mass)

ShiftyCapone

iTrader: (7)

Not sure what the critical speed is but aluminum shafts are typically balanced to run up to 160mph or so. Tire sizes and gear rartios will effect this number drastically however.

pvt num 11

Hmmm. Thanks, another part I may tack on my GTA wish-list...

ShiftyCapone

iTrader: (7)

That is why everyone goes with the LS1 shaft. Virtually vibration free at any speed.

Orr89RocZ

iTrader: (20)

i been 125-130 in the Iroc and it was smooth riding. FAST but not uncontrollable and no bad vibrations or feelings of any kind. quite stable. I had lots of rpms left too! LOL

f-crazy

iTrader: (-1)

anyone who thinks that an 86 peanut cammed auto 305 will hit 140 is hitting the pipe WAY TO HARD....aint gonna happen

itll take an L98 or a G92 LB9 to hit 140....the fastest of the thirdgens (excluding TTA's and firehawks) were the G92 L98's which hit 145 and the G92 LB9 which hit 143...both were SD cars and both were radar verified....an auto 305 car has no chance of hitting that speed...unless its a downhill road with tropical storm tailwinds =).....my G92 SD 305 hit 145+ speedo indicated, but the ticket from the state patrol said 142...the speed is also drag/no ***** on top limited..the Rpm's were at 4,500 just above were peak HP is produced (4,400)...


i coverd 12 miles in 5 minutes....

the critical speed for stock steel shafts is 134MPH...the 1LE shaft is 154 and the LS1 shaft is well above that...mostly due to the harmonic damper on the shaft itself

pvt num 11

12 miles in FIVE minutes... How much was your ticket worth? LS1 driveshaft... I like.

ridecamro

i was reading an article about a 86 i-roc vs the op of the line mustang. and the iroc out did it in every thing top speed was 147 mph. so it's very possible

f-crazy

iTrader: (-1)

Enough for me to keep it on the track =)

THEGENERAL

when i was younger....my wife and i bought an 89 iroc i believe it was in 94 anyway we bought it at a dealer for 9,000 really nice car only had 45,000 miles on it at the time ........anyway it was a 5.7 auto tpi
i had it up to 140 once and it wasnt too bad but not something i would have wanted to do all the time for one thing your not doing your engine any good by rapping it up that tight ....lol

our car didnt vibrate or anything at that speed ....had new tires on it but like i said its a dangerous speed to be at when you think of it anything can happen a blown tire a pot hole , deer, bird......you get the point ....

now im older and wiser i wouldnt think of driving that fast on the highway again .......too dangerous.....it belongs at the track for sure....

Orr89RocZ

iTrader: (20)

i hate to ask this, but what happens if you go above 134mph?

ShiftyCapone

iTrader: (7)

The shaft becomes unstable and you risk damage or failure to the shaft. A broken shaft without a safetly loop is like an olympic pole vaulter. Death to you.

Orr89RocZ

iTrader: (20)

.well, i figured that was coming. LOL thanks shifty for the news, i dont think i will be doing 135+ any time soon

BORLAZ06

omg....i did 135 with my stock steal driveshaft.....i didnt know ne better at the time..

350 TPI

iTrader: (2)

pvt num 11,its been my understanding that all the GTAs came factory with aluminum driveshafts.I also have an 88 and when i looked up the number of cars that got them i noticed it matched the GTA production for that year.I found the info on gtasourcepage.com.Check your RPOs to be sure.

Nate86

Jeeze, f-crazy... how did you manage to get away with that on a public road without being thrown in jail?

Isn't driving three times the speed limit "driving with intent to kill"?

anymethod

I'm guessing you weren't in VA when you got that ticket. Its a day in jail for every mph over 90. My friend at Virginia Tech found that out the hard way when he was doing 102mph.

~Matt

pvt num 11

I'd would've looked up my RPO codes a very long time ago, but the sticker is gone, darn it... I got the dealer invoice sticker thingy-bopper from GM, but that doens't list the RPO codes, only a few very basic things, like when it was made and how much it cost new. I'll have to crawl under the car and get the serial number off the shaft, would that tell me anything? Considering the car came with pretty much every stinking option known to Man at the time, I wouldn't be terribly suprised if it did have an aluminum shaft.

MDv6man

Crawl under there with a magnet-- easier than pulling a part #

f-crazy

iTrader: (-1)

if it breaks at the slip yoke or anywere but the rear end...then itll slide right out...and tumble down the road strking other cars...and the persuing person(s) whom were struck by said drivesahft will probly inflict bodily harm...

f-crazy

iTrader: (-1)

well it was 6AM in the morning and i was on my way back from NY to MI..i was on the ohio turnpike and being that there wasnt a car insight i decided to git er done....well mister ohio state patrol was just chilling in the median drinking his coffee or W/E and he got a wake up call...i came around the corner and BAM there he was...as soon as i saw him i slowed down, pulled over and waited for him to show up about 2 minutes later...i already had my keys laying on the roof and got out and put my hands on the hood as soon as he pulled up...he took me to jail and i called my mom and she came and paid the ticket and i was let go...spent about 8 hours in jail (and a few months paying her back)...not bad i guess but like i said wont ever do that again...it was a 4 figure ticket by the time it was all said and done...i dunno if thats whats its considered in ohio..maybe maybe not..i never would of thought of doing it if there was even the slightest amount of traffic..im stupid for doing it, but not stupid enough to endanger someone else

in order the get the JG1 driveshaft you had to have 1LE IIRC...my GTA has all the stuff except the JG1 shaft

pvt num 11

Well, at least you were responsible enough to face up to the ticket...

Yeah, Duh, of course a magnet would do it. Why didn't I think of that? Thanks a bunch, honest.

mjustdie

I've had 3 1986 camaro's so far, 2 iroc's and a regular z. the z topped out @ 147, had it pegged and wondered why it wouldn't go any further til i found out it was governed @ 147. that was the l69 305 and a straight open stretch about 1/2 mile long. my 1st iroc i never got the chance to get it over 125 before the wife wrecked it but it was still pulling. my car now, well 85 speedo is nearly always pegged when i hit the open highways and until i get a new one i can only go by tire size, gears, and rpms and i'v figured 120 but i don't like to go the speed without knowing what i'm at so hopefully this summer it will do over 160 with the mods. So anyone saying these cars won't do almost 150 from factory is more than just hittin the crack pipe, thier lickin the crack too!!! And the l98 compared to the lb9, please 20 extra hp is not enough to say it would take a 350 to do the task. technology today allows 4bangers to do those speeds.

Orr89RocZ

iTrader: (20)

when i did my 130 run in the L98 it was from a dig at the toll, onto the tollroad, and out the stretch that was over a 1/2mile long. more like 3/4 mile or so. I dont think a 86 Z will do 147, especially in a 1/2 mile stretch of road, but if it did, thats awesome.

mjustdie

i have 3 witnesses, 1 in car with me, and 2 in a blazer doing 120 and i was way past gone. the road is about a 1/2 mile, maybe closer to 3/4, dunno havent been out that way in a while. i pulled onto the road @ about 20 mph and punched it through the gears. had a 5 speed so that probably helped. plus it was carbed no tpi to dog out @ 4k.

Orr89RocZ

iTrader: (20)

what all mods did you have? Even if your car reved to 6000rpm, it might only be making 200hp which probly aint gonna carry you to 140+

Our cars do have some good aerodynamics, especially the 82-84.

nick418

oh for real? thats awesome, i want to hav your 305

z28monster

iTrader: (1)

for the reply a while back that only the G92 cars will go that fast ... if you read my info....i do have the G92 package..... my iroc is pretty much fully loaded with everything you could ever want/get that year....


i guess i have been cheating death alot then cause i have had my iroc 140MPH ish many times...... but again my breaks are allin great working condition and my alignment is right on... no shaking whats so ever at those speeds.....

and like i said my car came factory with the G92 package.... i looked up all of my RPO codes to verify every thing.. and i did rip off the rear end cover to make sure i do indeed have a posi.... so my RPOs dont lie lol.....like i said i have like every option with this car...

BORLAZ06

yea fireal ....my buddy has it on video. has to be at least a good 30 seconds at that speed if i remember correctly. but the dude doesnt know how to change it over to mpg format

nick418

oh well, i believe ya! I wish i was there in person tho... I havent even gone that fast in my L98

f-crazy

iTrader: (-1)

lmfao ohhhhhhhh kay buddy....you have the only f-body in history to be speed goverd at 147..ANNDDD hit 147 in less then a mile...hahahahahha sorry let me get off the floor...

im done with this thread..to many people "who know what there talking about"

Nate86

Don't feel bad. Topics like this almost always degenerate into a "Well, my car did this..." type of thread. Usually followed by others calling and then the thread being locked. Wouldn't be too surprised if it's nearing that stage.

ljnowell

I am an open minded person, but there is no way this is true. I just cant believe that you got to that speed in that distance. Why would you drive that way every time you hit the highway? Thats unsafe and irresponsible. But I am not here to start a flame war, so what are your mods on this car?

westman

So what about Spohn's HD driveshaft? How will that hold up?

Nate86

I'd like to know more about Spohn's peice as well. It doesn't seem too well worth the money if it doesn't offer some kind of signifigant advantage over an LS1 driveshaft... especially when going 150+ MPH is not a very common occurance for any street driven car.

mjustdie

well i did, maybe it wasn't stock, all i know is it was more than 120 and wouldn't pull anymore and the tach was up and i was in 5th. the previous owner worked for a gm dealership a few miles from my house, he babied it to death and it was quick. before i bought it he dropped over $1k in it but never told me in what. so if it wasn't stock then i'm wrong, if it was then i don't know how far the road is, like i said earlier it's been awhile since ive been back the road i was on. I ran a modded t/a with my iroc 2 years ago on about 1/3 of the road and we both nailed about 110. the road used to be used by the old heads for street draggin back i n the day so its a pretty long stretch. as for governed at 147, i am wrong, as far as i know that was the iroc w/ tpi. i found out only about a year ago that it had the l69, which was the more powerful carb'd engine for 86, over the lg4. rant and rave all you want, it shows your immaturity. that car is what turned me onto the 3rd gen camaros and is today my favorite car i ever owned. the highway speeds, well, when no one is around in the early morning all you have is a sunrise and open road, i like to push the car a little. so call me what you will, i don't care what you think. if your near by, its nice out, and ur not being a jerk, i'll take you to the road and we can have a little fun with our cars. i guess next someone is goin to tell me the newer camaros and birds aren't governed @ 167 too, right???

ljnowell

I dont see anyone ranting and raving, well except maybe you. I simply said that I didnt believe you made it to that speed. You yourself dont know, because the speedo stopped at 120. Im not near by, and I am usually a jerk , so I doubt that I will go out that way anyway.

I know my car isnt going to get that fast. I like it that way, cause how many dragstrips you see that are a mile long?

z28kindaguy

How someone got their car to 150 is beyond me. I have a strong running stock L98 and its hard work to get it to 130.

Orr89RocZ

iTrader: (20)

what kind of gears you got, cuz my 89 L98 with 2.77's gets to 100 real quick and 130 pretty easily too.

z28monster

iTrader: (1)

yeah i have a 145 mph speedo and i can get to 130 mph very easily.... sounds like your L98 has some issues man.... my other buddy with a 91 z28 with an L98/auto gets to 130 very very easily also

THEGENERAL

yeah 130 should be an easy reach....

not necessarily safe but definatly easy

nick418

yea 130 should be an easy reach, i read one time that a L98 hit 150mph stock... L98 is pretty impressive, but ppl like Orr hate the l98