L98 Peaked out?
Thread Starter
Drifting
Joined: Jan 2003
Posts: 1,894
Likes: 3
From: Reading PA.
L98 Peaked out?
I bracket race my 90 Auto. coupe it has a 52mm TB Headers w/no cat and flowmasters 160 stat no air pump and good coil and wires. The block, heads and intake are completely stock. It has 3.07 gears and I run it with skinnies and MT ET Streets It's an Automatic. The best it ran was a 13.23 at 104 is it done or is there a little more left?
Team Owner
Joined: Sep 2001
Posts: 62,153
Likes: 1,731
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
If you mean by keeping the intake and all stock, yes youre there. I cant see any way to get more out of that.
If youre willing to start headwork, cam changes, intake changes....youre only limited by money.
If youre willing to start headwork, cam changes, intake changes....youre only limited by money.
Melting Slicks
Joined: May 2004
Posts: 2,524
Likes: 10
From: Lufkin Texas
St. Jude Donor '05-'06
Originally Posted by vader86
If you mean by keeping the intake and all stock, yes youre there. I cant see any way to get more out of that.
If youre willing to start headwork, cam changes, intake changes....youre only limited by money.
If youre willing to start headwork, cam changes, intake changes....youre only limited by money.
With vader86. You are there. Thats actually very good #'s for what you describe. Now if you dont want to do cam, head, and intake work, with the #'s you already have you could easily and safely get into the mid 12's with a little ol' 50 shot of nitrous. Probably high 11's with a 125 shot. 
I'm running low 12's with a 125 shot with basically the same mods you have except I'm still dragging my butt with the 2:59 gears. 
I was running like 13.7-8 without the juice.
Thread Starter
Drifting
Joined: Jan 2003
Posts: 1,894
Likes: 3
From: Reading PA.
Thanks for the replys. I have another motor i'm building for the car that will go in over the winter. I also had 2.59s in my car and switched to the 3.07s then the car got slower due to the fact it spun like hell off the line. Thats when I bought the drag tires. I thought there may be another tenth or two left. I have a MSD box to install yet and maype a chip change might get me that tenth? Just a thought. Pipe
Team Owner
Joined: Dec 2000
Posts: 21,094
Likes: 282
From: Phila., PA burbs
Are you still running the stock torque converter. If not a 2500 stall converter would yield a nice gain. I'd also consider an Accel intake, aftermarket runners, 1.6 RRs. I'm not sure what mods you've already done, but there are a ton of bolt-on type mods that will give small gains on an L98. So my answer to your question is yes there is still more improvement to be had.............just ask Vic'89. 
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
My Crossfire runs 13.80s with 160,000 miles and a totally, factory original long block. I can tell you from experience, it's the intake manifold. Granted, the Crossfire is worse than the TPI, but not as much as some would think. I picked up substantially more than a half second, with only, home porting my intake. I don't know how much room for improvement there is in the TPI, but I guarantee you that heads, cams, etc, will be of little help with a stock intake.
Send that MSD box back. It will do nothing until you do a whole bunch more.
RACE ON!!!
Send that MSD box back. It will do nothing until you do a whole bunch more.
RACE ON!!!
Team Owner
Joined: Dec 2000
Posts: 21,094
Likes: 282
From: Phila., PA burbs
I would also probably switch the 52mm TB out for the original. I doubt your engine breaths enough to warrant the bigger TB and its probably hurting your times a bit. I know in my case the stock TB has been good down to 12.49 
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by TA
I would also probably switch the 52mm TB out for the original. I doubt your engine breaths enough to warrant the bigger TB and its probably hurting your times a bit.
RACE ON!!!
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Drifting
Joined: May 2003
Posts: 1,730
Likes: 1
From: Charlotte NC
St. Jude Donor '05
Originally Posted by pipe
I bracket race my 90 Auto. coupe it has a 52mm TB Headers w/no cat and flowmasters 160 stat no air pump and good coil and wires. The block, heads and intake are completely stock. It has 3.07 gears and I run it with skinnies and MT ET Streets It's an Automatic. The best it ran was a 13.23 at 104 is it done or is there a little more left?
I have a few running 12.50's or so but its going to take a convertor to get you there.
Team Owner
Joined: Dec 2000
Posts: 21,094
Likes: 282
From: Phila., PA burbs
Originally Posted by Alvin
I have a few running 12.50's or so but its going to take a convertor to get you there.
Hey Alvin. I'm not sure who it was, but someone from pcmforless burned a chip for me at JD's performance in PA. I've been very happy with it and it netted me a pretty nice gain.
Thread Starter
Drifting
Joined: Jan 2003
Posts: 1,894
Likes: 3
From: Reading PA.
Hey TA I race with you at E Town! The car has a 2,000 stall convertor in it no air pump Hooker long tubes without any cats w/ Flowmasters on a 52mm TB 160 t stat chip changed hypertech coil and taylor wires BPP air rammer 3.07 gears The shortblock heads and intake are completely stock. I know I could get more out of it with heads intake and cam but I just wondered if there was anything small to do to it and get it to run 13.00 before I put the good one under the hood? THANKS TO EVERYONE FOR THE HELP Pipe
Le Mans Master
Joined: Apr 2000
Posts: 6,341
Likes: 1
From: Shelton CT
Port the heck out of your plenum/runners/lower intake.. Gasket match them too. You could get a ram air system, A/C bypass belt, Airpump eliminator kit, custom chip/tuning, Power pulleys.
That should net you another 2-3 tenths if not more..
That should net you another 2-3 tenths if not more..
Burning Brakes
Joined: Apr 2005
Posts: 1,110
Likes: 0
From: JUPITER FLORIDA
Originally Posted by skateparkdave
With vader86. You are there. Thats actually very good #'s for what you describe. Now if you dont want to do cam, head, and intake work, with the #'s you already have you could easily and safely get into the mid 12's with a little ol' 50 shot of nitrous. Probably high 11's with a 125 shot. I'm running low 12's with a 125 shot with basically the same mods you have except I'm still dragging my butt with the 2:59 gears. I was running like 13.7-8 without the juice.
Drifting
Joined: May 2003
Posts: 1,730
Likes: 1
From: Charlotte NC
St. Jude Donor '05
Originally Posted by TA
Hey Alvin. I'm not sure who it was, but someone from pcmforless burned a chip for me at JD's performance in PA. I've been very happy with it and it netted me a pretty nice gain.
Awesome, yeah that would have been me. I read your sig, your car is runing very well!