My Iroc is a 1988 with a 5.7 L98 backed by a T5 trans.

It has the following:
High flow cat
3" flowmaster cat back
Exhaust cutout
K&N Air Filters
Completely sealed ram air setup that pulls air where the fog lights were


Say the driver is a pro and gets a near perfect run. Lets also say that the T5 is bullet proof just for argument's sake, therefore the possibility of breakage isn't a variable.

So in 1/4 mile what do you guys think my time would be?

I am asking because my brother thinks poorly of the thirdgens.(16sec cars) And I don't drag race, so it won't ever see a track.

 

I don't see why you couldn't get a high 13, I had a similar combo when my GTA was mostly stock but with headers. After the t-5 install and some good low altitude air I was able to get like 13.7 on the g-tech, my g-tech was about 0.1 sec quick compared to the track. Anyways I believe the camaro's are a lighter car then a GTA so yeah if you have a good running car I would expect some high 13's or low 14's at the very least.

 

I would guess between a 14.0 and a 14.2 at best. LT1 cars have another 50-60hp on L98 cars, better gearing ( 3.42 stock with a T56 ) and can still barely pull off a 13. They also don't fall on their face past 4000rpms.

 

I couldn't imagine using 3.42 gears on a t-56, my 3.7's are bad enough... Well for first gear anyways. Idk having lot of torque is not a bad thing, I used to beat a lot of lt1's when my car was mostly stock.

 

I would agree with a 14.0-14.2 is on the money. The T5 will help you a lot compared the the auto that they came with. Best way to tell is run it at the track. My brother has a T56 with 3.70's and yes 1st is pretty useless without a slick.

 

I think you may have typed that out wrong. 3.42s are the factory gears for T56 F-Bodies.

 

That is interesting, so no 3rd gen came with those gears or better. And yes an lt1 has more HP then a L98 but in a heavier car.
Now when my car had the stock L98 backed with a 5 speed and 3.23 gear ran 13.8X with out any problems, So I don't see why the Op can't do the same.
Maybe the problem is a 4th gen person needs to learn more about 3rd gens before making incorrect statements.

 

Yup I know, the 2.66 in the tranny I feel is pretty tall even mixed with my 3.7 rear let alone a 3.42 rear. Least the t-5 will have 2.95 first and would work ok with the 3.27 rear he has I'm assuming.

I looked into the weights of 4th gens before and most were in the 3400 lbs area, which is lighter then my GTA when it was stock, 3550 lbs. Of course it all depends on your options and model, but still you might be talking 100-150lbs difference which is really not a whole lot.

 

3rd and 4th gens weigh within 100-200lbs of each other. Its a really negligible difference. The quarter panels were made of plastic in addition to the car itself being smaller. A 1993 Z28 weighs in at 3400 even. The 98-02 models dropped a good bit of weight by using the Aluminum LS1 but made the difference back up in other areas.

Secondly, I'm going to confidently call bullshit on a stock L98 car with a 5 speed running 13s. The LT1 cars have a much better powerband with more power to back it up, along with better gearing and a 13.8 is a damn perfect run,

Lastly, my first F-Body was a L98 powered 88 GTA Trans Am. Oh and 87s didn't have 3.23 gears. They had 3.27s. Negligible but still. Don't try and call others out while running your own mouth.

 

I'll call some one out when ever I want. And at no time did I say the rest of my car was as it came in 87. And I did not say that it was with my current Tran Am. As most 3rd gen owner know a 5 speed never was put behind a L98. That right there should tell you the rest of my combo was not as it came from the factory. Was the car fully loaded? No, it was stripped down only having a drivers seat. no carpet or anything else inside I did not need. Fiberglass hood, fiberglass front and rear bumpers, notch back,fiberglass GFX, and before you say they never made them in fiberglass, I do, I have the molds and make my own. The car was lighter than factory and the only thing stock was the L98 engine.
The heavier the car the more power you need to get it off the line and down the track.
Now you can call B.S. all you want, You have that right. But your wrong And really that's all that needs to be known. And everything I said was true. So like I said you need to learn more, like what HP all stock L98's have. what is possible when tuned properly. Or maybe you just don't like the fact a stock engine L98 in a third gen F body can keep up with and even defeat a 4th gen.

 

The problem with your post is that you came on here and said " Now when my car had the stock L98 backed with a 5 speed and 3.23 gear ran 13.8X with out any problems " without saying anything else about modifications. That sentence implys that your car is otherwise stock.

Thats like me coming in here and saying " Yea my stock LS1 runs low 12s. Its stock except for the supercharger "

And why would you change out 3.27s for 3.23s? Sounds like you made a mistake and are trying to cover your ***.

You also thought a 4th gen weighs more than a 3rd gen, which you were also wrong about.

And finally, no stock weight, stock L98 powered thirdgen will beat any 4th gens. They have a very slight weight advantage, but also have usable power bands. Both the LT1 and LS1 make almost all of their torque before 3000rpm and hold it steady for most of the rev range when the HP finally catches back up around 5k rpms. The L98 falls off after 4000rpm. In short, they make their torque sooner than the L98 and hold it at near peak for most of the rev range.

So in addition to a 3rd gen being heavier, the most powerful L98 has a 40hp deficit against an LT1 and a 100hp deficit against an LS1. It isn't even coming close to beating either of those. The ONLY chance an otherwise stock L98 car would have is with a T56 against an automatic LT1. An LS1 car would beat it like Kunta Kinte. To me, it just sounds like you're upset that 4th gens are faster, which is something stupid to be upset about. The 4th gens are advancements. They're SUPPOSED to be faster. Hell, GM is STILL using the LS platform 16 years after its debut, they obviously did something right.

Sure the L98 can be made to be faster, but that just comes down to $$. With enough money, a golfcart could outrun a Bugatti Veyron.

 

My carbed TPI 5.7 with headers, t5 and 4.10s went 13.88 at 101 mph. My current car traps 100 on the 1/8th all motor, funny how that works.

 

my best run this year was a 14.06 at 97mph. carbed 5.7 L98, ST-10 with a 3.08 open diff

 

First I would not care if a 4th gen or any car beat me in a 1/4 mile race, I used the drags for tuning wide open, I don't have a problem with the ls or lt platform to bad gm is leaving the ls behind and is going back to the lt for 2014,
Now yes the only thing stock on my car was the 1991 C4 L98. it was backed up by a richmond 5 speed . and suspension upgrades. I did do what ever I could to lighten up that car.The times I thought was slow considering the tune in the chip. And removing so much weight. And not every T/A or third gen weigh 3500+ lbs. that is a fully loaded thirdgen. I put the car together to see how fast I could make it go. The weight reduction was the biggest thing,
Anyone that knows about thirdgens, knows a L98 was never offered with a 5 speed in a third gen.So if you assume the rest is stock shows what you do not know, In fact you should assume that the rest has bean modified because its backed by a 5 speed. You can't blame others if you do not understand what someone else states when they say a stock engine then adds what is not stock about the car like trans, gears.
What I don't get is why your so up in arms about a stock engine L98 making those times. It kind of sound like your car would not make a 1/4mile in that slow of time , And I know a 4th gen LS1 car should be in the lower 13s.And with a proper tune should be high 12's
I do understand that you are into 4th gens. And that's cool. it's a very good platform, with lots of potential.

 

Hmmm, some misinformation here. 1st of all my 92 T/A came from the factory with 3.42 gears. 2nd, 4th gen cars are mostly metal. The doors, fenders and bumpers are the only plastic parts. Quarters are metal.

OP, my T/A with a 305 TPI, T5 went 14.5's. Only mods were 3" exhaust and K&N filter.

 

4th gens are heavier wider and longer then thirdgens....a fully loaded ls1 ws6 t/a weighs about 3550....I have had one weighed before. My z28 without power options but full interior,a/c,heat,radio and sub weighed in at 3380.....does it seem like a lot of 4th gen guys hate thirdgens to anyone else?

 

Going back to the LT? The name is only a designation change, they aren't using a LT1, its a completely new motor.

 

My point was that the LS was being replaced. And they are going back to the LT platform. And if you reread what I wrote, I never said they are going back to the LT1. I said LT.
Personally I don't really consider the LT1 from the 90's to be a true LT1.

 

the new lt is really a evolution of the ls. not in any way shape or form related to the old lt motors. its just gm speak of recycled names. I think they just ran thin on ls names. although lq were also ls akong w others. but still ls motors. lt is just the new ls evolution.
alot of similarities. not goin back to any of the lt platforms. just recycling the name w is common for gm

 

@ T/A Performance : I go off by what has been posted. If someone lists their mods, I assume that is all of their mods. Why? Because it makes no sense to omit mods. Someone says their car has a 5 speed, the logical thing to think would be that they simply threw in a T5 since it bolts right in with as little work as possible. Secondly, most people who swap in Manuals opt for a T56. A T5 or T56 swap covers probably 99% of the people who have mated a manual to a TPI engine. Its the safest assumption since the first mention of it did not say exactly what transmission was swapped in.

Secondly, I am not " up in arms " over anything. There has been false information posted, I made sure that the correct information was posted.

Thirdly, just stop posting. All of your posts in this thread have been full of fail. Incorrect information, talking out the ***, etc.

Lastly, you failed to mention that your L98 was in a C4. Thats a lighter car than a Thirdgen. If you're going to post what your car ran, etc. INCLUDE ALL OF THE RELEVANT INFO FFS. I can say my stock LS1 ran a 11.XX on a F-Body forum and everyone will assume its in an F-Body and call BS. The entire story changes when I tell them its in a Miata.

That **** does not make you seem clever. In fact, it makes you seem like a moron. You're on an F-Body forum with the username " T/A performance " while listing your car as a 5 speed 355 Trans Am. Now you come on here and say that your used to be stock 5-speed swapped L98 car with 3.23 gears ran a 13. There are issues with this statement.

1. It implies that your car is 100% stock aside from the 5-speed
2. Automatic F-Bodies had 3.27 gears available. In conjunction with with #1, this leads us to think that you most likely made a typo.
3. You completely omit the fact that said car was a Corvette despite all signs pointing to F-Body.
4. You also omit that the car was completely gutted.

You really need to be clear on what you're trying to say before you post anymore. Reading your posts is like trying to make sense of a book while starting at the last page.
Had you said " My gutted 5 speed swapped C4 Corvette with an L98 and 3.23s ran a 13.8 " in the first damn post you made then we wouldn't be having this discussion. ( I agree, that IS a slow time BTW. Maybe you need more practice on the stick? )

P.S. nobody said all 3rd gens weigh 3500+, please learn how to hooked on phonics as well.

 

Really , Who are you to tell anyone on this site to stop posting. Your rants only show how much you don't know. You keep posting about what I wrote saying it's a fail and there is no way my car could have done what it did when most other know that it could have.
Now you have basically called me a liar. And you don't know what you are talking about. You sit there saying that this didn't come with that so it is B.S. So I guess no one swaps out part from other cars like rear diffs, engines, transmissions and such. Your jumping to conclusions and calling B.S. just shows how much you need to learn more and grow up.
If you don't like what I've written you can just put me on your block list so you won't ever have to read any of my post again. But I'm not going to stop posting, That is not your call to make or say.

 

Kevin Lee 487;] What's interesting is that you haven't brought anything positive or helpfull to this thread. Just disrespect and rudeness, Maybe you're one of those people that need to bad mouth others to feel like you are important, To feel like a big man. So I'm not going to tell you that you as a person is a fail. Your written words in this thread does that job for me.

 

You are all idiots arguing over stupid things with mis-information between both of you.

4th gens are near identical weight, some heavier, some lighter. Depends on options.

As for the original post in this thread. A mid 14 is likely depending on your skill as a driver. None of your mods listed add any appreciable power. A cat-back helps, but really doesn't provide any performance boost compared to the gain with headers and a tune.

 

Who are you calling idiots?

 

I'm done arguing with you. You are a moron who doesn't know how to read as you have continually proven in this thread. I will not waste my time explaining step by step as to why because, just like my last post, you will fail to read it properly and open your dim witted mouth again and say something stupid because you can't read.

I'm all for having a civil discussion, but its not possible with you until you actually pass a 3rd grade English course.

Edit : By the way, you are the one who came on here implying my information was wrong, when it has been correct from the start. I am sorry that you have been misinformed, but that is no reason to step into a thread with an attitude because you thought I was incorrect.

 

OK you've proven my point, I hope you have made your self feel better about who you are. You can call me what ever name you want to call me, Say I'm dim witted and can't pass 3rd grade English. You can sit there and say I'm a fail and say what I've written is wrong and I may have gotten some things about 4th gen wrong, I'm not perfect, I don't know everything I will admit that. But I'm not the one who called B.S. which is calling me a liar. But you can do that, You can say anything you want about me if that is what it takes to make your self feel better or an important person.
I'm finished with this thread it has become pointless and way off topic, And for that I say sorry to all but Kevin Lee 487.

 

Thanks for the input guys. So I know now that low 14's are likely, and a high 13 pass isn't to far out of reach.

As far as the arguments above, I didn't want this thread to get off topic like it has.

Its alright to attack one's argument and provide reasons why it is wrong. Then go back and forward to prove each others argument wrong. However it is not necessary to attack the person.

 

One last thing Kevin Lee 487. You say I'm a moron and can't read. Well maybe you need to re-read what has been written, No where does anything I have stated say's the car I built and made those times in was a C4 corvette or any corvette for that matter. I said the engine was a stock L98 from a corvette. That engine is only rated 5 hp over the f-body l98. As a matter of fact if you re-read what I wrote it all points to it be done in a third gen f-body. If you want to know what car exactly, It was a 84 T/A.
So am I the one who did not clearly comprehend what was written. Was I the one who assumed something else than what was written. Was I the person who came onto a thirdgen f-body website and put down those cars or the L98 engine in the first posting they made in this thread. This site isn't for all f-bodies, It is a third generation f-body forum.
Me needing hooked on phonics is funny. I can comprehend what I've read very well.
And third gens came in many different gear rations. They just didn't come in just a few. And it is why I said you needed to learn more. You can't assume because the 88 GTA someone had with an automatic came only with 3:27 and that was the only ratio available for all years, In 1987 they came with a 2:73. 2:77, 3:08, 3:23, and 3:42 but not the 3:27 that was offered in 88 and 89 only. In 84 threw 86 you could get 3:73. And this is just a few of the gear ratios offered to third gens.
So in the end not every thing you wrote was correct, And I'll admit I was wrong about the 4th gens being heavier cars, some of them are and some of them aren't. So if you take the time to re-read this thread and still have trouble comprehending what was written I'll let you barrow my hooked on phonics tape.