13,91@99mph w mods...
Thread Starter
Racer
Joined: Sep 2000
Posts: 337
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13,91@99mph w mods...
I recently drove 13,91@99mph with my modified 91. I have Hooker headers and a true dual with high flow cats. AFPR, cut lid and a ported plenum.
Before I did all this my best time were 14,40 (no precats, K&N, no mufflers). I have a 2,59 gear.
Yesterday I ran it in a Dyno and the result was 218rwhp.
I have seen stock cars here that runs 13,90 and have 220 or more rwhp.
Is something wrong with my car?
:confused:
Before I did all this my best time were 14,40 (no precats, K&N, no mufflers). I have a 2,59 gear.
Yesterday I ran it in a Dyno and the result was 218rwhp.
I have seen stock cars here that runs 13,90 and have 220 or more rwhp.
Is something wrong with my car?
:confused:
Safety Car
Joined: Jun 2000
Posts: 4,870
Likes: 25
From: Long Island, NY
Re: 13,91@99mph w mods... (Cratzy)
I would think that your ET should be a little quicker, but you did manage to go from 14.4 to a 13.90. That's a nice 1/2 second gain.
The 2.59's will not hurt you with the L98 motor.
How was the traction ?
Vic
The 2.59's will not hurt you with the L98 motor.
How was the traction ?
Vic
Team Owner
Joined: Mar 2000
Posts: 83,383
Likes: 87
From: Boston, MA
How many miles on your car? Do you still have the main catalytic convertor on it? If so has it been inspected? When mine was plugged up I ran 14.6. @ ~ 94 I then got it replaced and ran 13.89 @ 98.17.
Thread Starter
Racer
Joined: Sep 2000
Posts: 337
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Re: (scorp508)
Ok, the gain was nice, but I had better traction this time, little less pressure in the tires. Still a little wheel spin though.
I have a true dual system, so I now have two free flowing Catco catalytic converters, so no plugged catalytic converter to blame.
So what about the 218rwhp? I was told that it should respond to 270hp on the crank? If so that is ok. But still I saw this guy here on the Forum with a 1990 stock that claimed he had 225rwhp (only K&N)!!
The car has been around for 68750 miles, so I am planning for a rebuild (383).
Thanks for your comments.
:cheers:
I have a true dual system, so I now have two free flowing Catco catalytic converters, so no plugged catalytic converter to blame.
So what about the 218rwhp? I was told that it should respond to 270hp on the crank? If so that is ok. But still I saw this guy here on the Forum with a 1990 stock that claimed he had 225rwhp (only K&N)!!
The car has been around for 68750 miles, so I am planning for a rebuild (383).
Thanks for your comments.
:cheers:
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: 13,91@99mph w mods... (Cratzy)
Though the ET is a little low for that trap speed (likely due to spin), trap speed corresponds well to the dyno numbers.
That 218hp out back is about 255hp at the crank.
Did the dyno operatore use a wide band O2 sensor?
Do you have the AFPR tuned to the inproved air flow?
What is the elevation and the weather at the strip?
What was your coolant temp during tests?
Is the "frisbee" still on the front of your water pump?
[Modified by 65Z01, 11:40 AM 8/26/2002]
That 218hp out back is about 255hp at the crank.
Did the dyno operatore use a wide band O2 sensor?
Do you have the AFPR tuned to the inproved air flow?
What is the elevation and the weather at the strip?
What was your coolant temp during tests?
Is the "frisbee" still on the front of your water pump?
[Modified by 65Z01, 11:40 AM 8/26/2002]
Team Owner
Joined: Sep 2001
Posts: 62,159
Likes: 1,733
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Re: 13,91@99mph w mods... (Cratzy)
What are your 60ft times? I wonder what the elevation is at your track?
You should be putting just about 270hp crank, i'm guessing an 17-18% loss from the A4.
You should be putting just about 270hp crank, i'm guessing an 17-18% loss from the A4.
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Instructor
Joined: Apr 2002
Posts: 243
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From: Hockessin DE
Re: 13,91@99mph w mods... (vader86)
whats your 60ft times? you have more mods than me, but im running about a half second faster, but my 60fts are pretty good for stock tires : 1.94. i think 3.07s would definately help a TPI motor, they helps me pass my brother mid track everytime we race (he has 2.59s). one more thing, what altitude is the track you are running at? that could effect E/T alot.
Thread Starter
Racer
Joined: Sep 2000
Posts: 337
Likes: 0
Re: 13,91@99mph w mods... (65Z01)
Did the dyno operatore use a wide band O2 sensor?
Do you have the AFPR tuned to the inproved air flow?
What is the elevation and the weather at the strip?
What was your coolant temp during tests?
Is the "frisbee" still on the front of your water pump?
- No AFPR tuning
- It was hot! ~250 degrees
- No "frisbee"
60ft = 2,23
I don't know the altitude, but it is not high. Sweden is flat :)
Thanks :cheers:
Le Mans Master
Joined: Aug 2000
Posts: 6,227
Likes: 0
From: Corona CA
Re: 13,91@99mph w mods... (Cratzy)
The car has been around for 68750 miles, so I am planning for a rebuild (383).
2.23 60' is not good for 2.59 gears. With a little practice that will be in the 1.9s. Say what you want about 2.59s but they make it easier to launch on street tires.
250 degrees!
Team Owner
Joined: Nov 1999
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From: This vette goes to 11 Milford MA
St. Jude Donor '03-'05
Re: 13,91@99mph w mods... (Cratzy)
The gears aren't helping. With Hooker headers, 2 1/2 duals, 3.07 gears,a 2600 stall 160T-stat and DR's, my car runs average of 13.4@99 in the summer, 13.2@102 if its cool out. It made 245/328 on the dyno. I think the heat was killing it.
Racer
Joined: Aug 2001
Posts: 396
Likes: 0
From: Clinton Township MI
Re: 13,91@99mph w mods... (Fastguy)
i just ran a 14.3 with an reaction of 1.151(my first run ever) later they were down in the .50's with a 60' of 1.994 my mph was 93.55, it was about 70 or so outside and my car was at 225, im lookin for a set of 3.54's and some headers, im shooting for 13.9's next summer, man i took 15 runs i didnt think that it would be soo addictive
Racer
Joined: Jul 2000
Posts: 478
Likes: 8
From: Deerfield NY
Cruise-In IV Veteran
Re: (Cratzy)
Hi,
My car is basically stock, just chip, K&N. ran 222rwhp and 318rwtq at carlisle last weekend... How much more could I expect when I gut the cat and get rid of the "frisbee"??
This thread has the dyno charts
http://forums.corvetteforum.com/zerothread?id=374696
Thanks :cheers:
My car is basically stock, just chip, K&N. ran 222rwhp and 318rwtq at carlisle last weekend... How much more could I expect when I gut the cat and get rid of the "frisbee"??
This thread has the dyno charts
http://forums.corvetteforum.com/zerothread?id=374696
Thanks :cheers:
Thread Starter
Racer
Joined: Sep 2000
Posts: 337
Likes: 0
Re: 13,91@99mph w mods... (rcolling)
That engine is still good for another 100,000 miles!.
Are you sure? That is waaaaay too hot. Check your fans the car should never get over 230 and for racing under 200 will give you a big performance boost.
By the way, the chip didn't do anything to improve the effect :rolleyes:
Safety Car
Joined: Dec 2000
Posts: 3,767
Likes: 5
From: Jacksonville Fl
Re: (Cratzy)
With a high mileage motor...you can probably point a finger at a lot of things, like clogged injectors, worn out timing chain ( makes a motor lazy ), low fuel pressure...and so on.
Then again, what elevation are you running at? What was the temp when you ran? It's little things that make the difference.