stock motor TPI Vette: 13.16 at 103.58mph

[Mad-Mic]

thanks Chris!

i just don't understand why warren is so bent on saying our cars can't run these numbers when they can and are!

how can you say an 89 L98 vette with aluminum heads only can muster a 14.8 when an 89 Iroc with the same L98 but with iron heads can run 14.5's and faster bone stock?

BTW i never seen a LT1 vette run a 13.4 bone stock. 13.7's 13.8's yes but not 13.4's

this post went from an informative one for L98 owners showing them what a L98 car can do with mild bolt on's to a Flame war cause some don't want to believe a L98 can run as fast if not faster for very little money than their LT1 cars.

 

[*89x2*]

thanks Chris!

i just don't understand why warren is so bent on saying our cars can't run these numbers when they can and are!

how can you say an 89 L98 vette with aluminum heads only can muster a 14.8 when an 89 Iroc with the same L98 but with iron heads can run 14.5's and faster bone stock?

Considering my 89 GTA 5.7L ran 14.3 Bone Stock I highly doubt a Vette from the same year (89) would be slower :confused

FWIW - my friends 89 GTA ran 14.2 Bone Stock both cars were nearly identical with his having twin cats and mine having one large 3" cat - both had alumn driveshafts and the rest of the good stuff GM threw at the Birds that year

enjoy

 

[warren s]

MAD-MIC

You really have issues reading. I didnt want to make this a flame war nor do i consider it one now, but you keep either mis-quoting me or mis-understanding what I am saying.

1. I never said your cars cant go as fast as they do.

2. I dont care if anyone has a faster car than me.

3. My LT1 is not bone stock, and I dont care if a L98 car or a Toyota Supra is faster.

4. I got the 14.8 ET for a 1989 Corvette from SPECS & PERFORMANCE LISTED ON THIS SITE, and an old Motor trend lists 14.5, Hot Rodding magazine lists 14.5 and Road & Track list 14.7

5. ALL I KEPT SAYING FROM POST ONE IS THE CAR HAS MORE POWER THAN STOCK, and i find it very "interesting" that it goes so much faster than stock with the small mods listed.

 

[tpivette89]

I got the 14.8 ET for a 1989 Corvette from SPECS & PERFORMANCE LISTED ON THIS SITE, and an old Motor trend lists 14.5, Hot Rodding magazine lists 14.5 and Road & Track list 14.7

these times are obviously wrong. my bone stock L98 went 13.9 at 99 with a 2.0 60ft. a far cry from the published figures, but this is what happens when an experienced driver gets behind the wheel. i took the full potential of my car and brought it out. i did things to it that MT and the like dont do at a dragstrip.

for example:
- i deflate the rear tires to 20psi for a better launch.
- i let the motor cool down between passes and ice the intake manifold.
- i launch the car at 1000rpms instead of just flooring it off idle.

these are the kind of techniques it takes to get a stock L98 to run high 13s. nothing was done to the car mod wise, but im willing to bet C&D dont do these things to bring out the best in their test vehicles.

Franks car ran a best of 12.99, there is trememdous differance between a 95 that stock runs a 13.6, hitting 12.9, and a car that runs 14.8 stock running 13.1. And I never said LT1 Vettes can only run mid to high 13 second times, I said that was their stock published times. (mid 13s)

hmmm, now youre comparing my modded car to Mojos stock one. i used his LT1 Vette to prove that cars do run outside their published output. when you compare stock to stock performance between his car and mine, they both add up.

published stock LT1 - mid 13s
Mojos car - high 12s (about a half second difference)
published stock L98 - mid 14s
my car - high 13s (same difference as above)

Good luck with 12.9s on Wens

thanks! itll be tough, but i think its possible as long as the weather cooperates

 

[Mad-Mic]

well warren your the one that started this. i can understand if tpivette89 came in here and said his car was bone stock with no mods and beating down LS1's all the time. something way out in left field and had no witnesses BUT you still can't believe what we say and act if we are lying about the times. so who is mis understanding who?

this went from basically you calling us "liars" to a "misunderstanding" not knowing how these cars can run as fast on a stock motor, stock TPI, stock gears.

if i didn't see the timeslip and evidence (by looking at his car) i would be doubting him also as you are BUT i seen it and believe it and been here long enough you should know me by now and my racing background and yet you still won't believe it.

BTW those times in the magazines are always bumped up atleast 4 tenths do to full tank of gas and not heating the tires at all and probably not stalling out the trans or launching on a manual at optimum rpm. heat them up on a 1/4 tank of gas and you will see 14.2-'s to 13.9's easily so you see where i'm going with this right? add a few mods and DR's and you can see low 13's easily. add a stall converter and you can see 13.1's to 13.2's easily and maybe even a high 12.9x or 13 flat with good air and good track prep.

 

[Mart]

Stock ????

Well The car obviously is not what I would call STOCK. The motor is getting a little breathing help (both in and out) that does make a difference.

But I will say that the L98 was always known as a torque monster.

My stock 86' with open filter usually takes C5's off the line, oh yeah I have 88' wheels with 275's on them, so that helps.

I have even smoked one of them new Porsche Boxtster S. Man was he surprised, all that money and no low to midrange.

My 86' is also Z51, which comes stock with 3.07 rearend, and stiffer than normal sway bars and shocks.

So in conclusion I guess "Stock" is a term that everybody has thier own definition of.

I do not doubt the times you posted, although they are hard to believe, if the conditions are right.....WHY NOT.

I think some people may get upset at the fact that they spent alot of money on a new C5 and just dont get the big picture.

TORQUE RULES

Congrats on your time.
Mart[

 

[Ken]

This whole thing is as old as automobiles themselves. :eyerole

 

[warren s]

well warren your the one that started this. i can understand if tpivette89 came in here and said his car was bone stock with no mods and beating down LS1's all the time. something way out in left field and had no witnesses BUT you still can't believe what we say and act if we are lying about the times. so who is mis understanding who?

this went from basically you calling us "liars" to a "misunderstanding" not knowing how these cars can run as fast on a stock motor, stock TPI, stock gears.

Once again Mad Mic, I must state that reading comprehension is not you strong point.

Please find my post where I say you or TPIVETTE89 are liers and I dont believe the time of 13.1 Actually a few posts back I clearly said that if you and the owner say it ran a 13.1 i accept that it did,... and as for me being the one who "Started this", started what??

What I have been saying all along is that the car must be putting out alot more power than stock and I doubt the mods listed and driving technique are soley responsible. Again I said I doubt it, that is a personal opinion, not calling some one a liar. I did ask if tpivette89 was the origional owner, as I was wondering about a possible cam change that would not be known at this time., for example. just a guess.

 

[Mad-Mic]

Once again Mad Mic, I must state that reading comprehension is not you strong point.

Please find my post where I say you or TPIVETTE89 are liers and I dont believe the time of 13.1 Actually a few posts back I clearly said that if you and the owner say it ran a 13.1 i accept that it did,... and as for me being the one who "Started this", started what??

What I have been saying all along is that the car must be putting out alot more power than stock and I doubt the mods listed and driving technique are soley responsible. Again I said I doubt it, that is a personal opinion, not calling some one a liar. I did ask if tpivette89 was the origional owner, as I was wondering about a possible cam change that would not be known at this time., for example. just a guess.

every person each his own....

believe what you will. from the beginning of this post you critisized this car and what it runs. you act like he's squeezing the juice or superchared on the 14.8 car that you say it can only run dead stock.

i can't wait till tpivette89 hits 12.9x or 12.8x with just mild porting. gives me something to look forward too

 

[warren s]

believe what you will. from the beginning of this post you critisized this car and what it runs. you act like he's squeezing the juice or superchared on the 14.8 car that you say it can only run dead stock.

Or maybe you just took it that way?

I never had one bad word to say about the car, or any Corvette for that matter.

I hope he does run a 12.9, if thats his goal. It takes nothing away from me, I am very happy with my 13.4.

 

[MagikDraggin]

i can't wait till tpivette89 hits 12.9x or 12.8x with just mild porting. gives me something to look forward too

Is it just me or is there some reason why all these (what appear to be) unnaturally low track times are all from tracks on the east coast?

I have never run on the east coast, but I can say there is a big difference between tracks on the west coast and those in the midwest.

Iwould like to see the track times for a "stock" L98 from a midwest or west coast track, just for comparison, if nothing else.

Really, I didn't mean to kick over this can of worms earlier with anything I might have said and I hope this post doesn't serve to inflame anyone either. But I DO question the wisdom of MY spending nearly 5 grand to get my LT1 to run (only) as fast as a stock L98, or (only) as fast as Mojo's stock LT1.

Or maybe what I REALLY should do, is drive it out to one of the East coast tracks and see what it can really do, huh?

 

[warren s]

5 grand? what did you do? and what time does your car turn?

 

[MagikDraggin]

5 grand? what did you do? and what time does your car turn?

I took a stock C4 LT1 A4 that ran 14.1 @ 100.9 mph and did the following mods to make it go 13.02 - 12.97 @ 104 - 106 mph.

Short times went from 2.2 sec down to 2.0 sec on 285 street skins with 26 lbs air. Air temp 72° hum 46% at a track in Xenia Ohio which was nicely prepped.

ZZ409 cam, 1.5 RR's, springs, etc
Ported and aligned intake/heads
Larger valves in heads
TPIS 52mm TB
BW 2600 stall lock-up converter
TPIS coated longtube headers
3.54 heavy duty gears while keeping the D36 casing
Corsa exhaust system
TPIS Hi flo cats
K&N open lid air filter
160° Hypertech Tstat
Programmed by TPIS

It now dynos out at 390hp at the crank, 310 at the wheels at 6100 rpm, with 300 ft lbs torque at 4100 rpm

From what I've read here, I could have simply bought a stock '85 L98, gone just as fast and been money ahead.

 

[warren s]

What rear end gears did you have before the change to 3.54s?

My 95 Lt1 A4 with the 3.07s ran a 13.6 at 102, almost exaclty what the times listed on this sites "Spec and performance" by years shows.

I did the throttle body coolent bypass, 160 therm, opened up the lid, and put a fan overide switch in so I could keep the temp around 170. My usual times are now a 13.39 to 13.42. I dont do anything at the track like ice down the intake or run drag slicks. I do get tire spin though. I like to keep it "street" so I know what i will run when the light turns green. I may pick up a tenth on better tires and a cooler intake.

I felt the Corsa exhaust was a waste of almost a grand from a performance stand point.

From what I've read here, I could have simply bought a stock '85 L98, gone just as fast and been money ahead.

Not going to touch that one.

 

[Mad-Mic]

what altitude is your track at? we are less than 50 feet above sea level which is why we are getting these times most likely.

BTW how do you like the ZZ409 cam? i think that is the cam i am going to go with.

 

[MagikDraggin]

What rear end gears did you have before the change to 3.54s?


I felt the Corsa exhaust was a waste of almost a grand from a performance stand point.

Mine had the 2.59 gears. Not a hint of a "scratch" off the line, but considerable "bogg" until the "R's" got up to 2500, then it ran fairly decent. I could tell the power was dropping off at around 4800 rpms though.

Now it pulls strong, probably well beyond my self-imposed limit of 6 grand on that stock bottom end. I am NOT happy with the torque curve though, as it dropped off considerably at 4100 rpm. Gotta get that looked at. I am like you....it is a street car, not a drag car.....(not that I would actually "race it" on the street, mind you), heh, heh, heh.

Yeah, the Corsa looks good and sounds good, but why they felt the need to go from the 3" that the stock system was down to 2.5" is beyond my feeble comprehension. And WAY overpriced for what ya get too. If I had it all to do over again I would have gone with some Thrush glasspacs and some straight pipes. That is an underappreciated sound system in my opinion. Cannot STAND the hollow roaring sound of Flomasters and the like.....makes a Corvette sound like a Mustang, uunnngh!

 

[Mad-Mic]

Mine had the 2.59 gears. Not a hint of a "scratch" off the line, but considerable "bogg" until the "R's" got up to 2500, then it ran fairly decent. I could tell the power was dropping off at around 4800 rpms though.

my 87 was doing the same thing until i bumped timing up to 12 degrees advanced. if i didn't launch it right (1 out of 10 were good launches) it fell flat on it's face. now with the mods or lack there of i can pull sub 2.0 60' times on old GSC's (best is a 1.94 60') on a 2.59 gear and stock 1600 rpm stall. only thing i did was drop the psi down to 20. best mods so far IMO were bumping the timing and eliminating the pre-cats and going with a high flow cat. in a month i dropped a full second on my average ET's!

 

[MagikDraggin]

what altitude is your track at? we are less than 50 feet above sea level which is why we are getting these times most likely.

BTW how do you like the ZZ409 cam? i think that is the cam i am going to go with.

Don't know the altitude for sure, but I would guess around 800 above sea level, give or take a hundred or so. The vette ran much as it did here in Iowa and this elevation is near 800 feet.

While on the West Coast just last month (Bakersfield and Carmel), where the elevation posted was only 80 feet, I couldn't get the rears to break loose on hard acceleration. Maybe it's their nasty 90-91 octane gas out there.

I really like the ZZ409 cam. I chose it over the Hotcam because according to the specs I could stay with the 1.5 RR's and have a flatter horsepower curve than what the Hotcam delivers, with a stronger top end, without sacrificing much low end torque.

It's got a pronounced lope at idle, but nothing excessive and it smooths right out with the A/C on. Only complaint is the drop in manifold vacuum interferes with the power brake booster during warm up.

If the weather holds, once I get the pooter back from TPIS, I'll be taking it up to Tricity raceway in Earlville Iowa for another crack at the 12's.

 

[warren s]

If I had it all to do over again I would have gone with some Thrush glasspacs and some straight pipes. That is an underappreciated sound system in my opinion. Cannot STAND the hollow roaring sound of Flomasters and the like.....makes a Corvette sound like a Mustang, uunnngh!

Wow! I used to have Hush Thrush glasspacks on almost all my old cars
(GTOs, 74 Grand AM 455, etc.) They were usually connected to a pair of $99 Cyclone Headers. Never sounded like the hallow 55 gallon drum of a rustang.

I wish it was that simple for the Vette. My 95 runs clean up to the rev limiter. If you are loosing power over 4 grand, I would say its the fuel system or the opti crap going bad.

I am thinking of going to a 3.73 gear set. Cam, new rockers and some mild porting. Its about all I feel confident doing on this car and i cant afford to pay some one else. (gears will be in an assembled carrier a friend is selling me - maybe) Should add some snap on the street.

 

[MagikDraggin]

Wow! I used to have Hush Thrush glasspacks on almost all my old cars
(GTOs, 74 Grand AM 455, etc.) They were usually connected to a pair of $99 Cyclone Headers. Never sounded like the hallow 55 gallon drum of a rustang.

I wish it was that simple for the Vette. My 95 runs clean up to the rev limiter. If you are loosing power over 4 grand, I would say its the fuel system or the opti crap going bad.

I am thinking of going to a 3.73 gear set. Cam, new rockers and some mild porting. Its about all I feel confident doing on this car and i cant afford to pay some one else. (gears will be in an assembled carrier a friend is selling me - maybe) Should add some snap on the street.

Ahhh, you misunderstood me. I actually LIKE the Thrush glasspacks and how they sound. If I had it to do again thats what I'd put on my vette instead of the Corsas. Its the Flowmasters and Dynomaxes that sound like hollow empty 35 gallon oil drums roaring down the road, (like a Mustang 5.0 sounds with them).

The 3.73 gears should make your '95 get up and kick some serious street butt.

I experienced the power loss when the vette was stock. It's not that way now after the mods. It pulls strong up to 6 grand and probable well above (but I'm afraid to take it there).

I have computer issues right now that need to be resolved before I get to messing with anything else.