11.8@118

[tpower]

Originally Posted by Higgs Boson

that's because these aren't drag cars. they are IRS, stiffly sprung, 4000 lb monsters, over engineered for corners.

yes, 118 mph is 425rwhp territory with a 3000 lb car geared and sprung for the strip.

The seat weigh damn near 70lbs in my car , I have never owned a drag car that weighed more then 3050lbs

[Joebot8484]

Nice Dude!

[jdsgn]

Originally Posted by Higgs Boson

that's because these aren't drag cars. they are IRS, stiffly sprung, 4000 lb monsters, over engineered for corners.

yes, 118 mph is 425rwhp territory with a 3000 lb car geared and sprung for the strip.

Not quite... not to bash the OPs car or his times given the DA, but even still it should be trapping much higher than that. 425 rwhp in a 3000 lbs car would be mid 120s with the right gearing. 600 rwhp (same as a GT500) weighing in 200 lbs more than a GT500 yet it traps 7 mph less than most that have run in similar summer conditions? My very mild H/C/I GTO (can't even hear it cam) with shorty headers and exhaust has been 116 on a 2600 DA day blowing through the clutch up top. There is something being lost somewhere, Id be really curious to see a datalog of the run and record knock retard and a/f ratio. Dyno tunes dont always equal a good street/track tune.

[MikeOD]

Originally Posted by tpower

601 rwhp heat soaked ZL1

It seems you're way down on power due to the heat soaking...might want to work on that next. My 499 RWHP SS traps higher mph.

I'd expect high 120's from 600rwhp...maybe even knocking on the door to 130.

[MikeOD]

Originally Posted by jimmy5

Try relocating your IAT as well, that, and a good set of rubber, I bet you that it drops by at least .5

No, that's like putting a band aid on a really bad wound...like a severed arm. The problem is NOT where the IAT is located, it's in the tune. If the engine can take more spark for a given IAT, then the IAT correction tables are too agressive. Never force the IAT to measure anything other than the air temp that's actually going into the runners of the heads. Give the computer the most accurate data you're able to give it, and then tune it accordingly.

Originally Posted by jleews6

That's why a dyno is really only good for tuning because there is no way a car with almost 700 fwhp is going to go 118 @ 4300lbs. My friends Chevy 4wd pick up runs faster with about the same dyno numbers.

TPOWER The good news is that your times are about an 11.40 @120 at sea level. Were you on pump gas? I would like to see what your timing looks like on the run because if it's pulling timing your leaving allot on the table. Ill bet that if you spent a day at the track and did all the drag racer secrets your car would be a very low and maybe even a ten second car.

I agree, I think his car is pulling a lot of spark, possibly due to IAT, that it may not need to, and I think the tune needs some work as a result.

Originally Posted by jdsgn

Not quite... not to bash the OPs car or his times given the DA, but even still it should be trapping much higher than that. 425 rwhp in a 3000 lbs car would be mid 120s with the right gearing. 600 rwhp (same as a GT500) weighing in 200 lbs more than a GT500 yet it traps 7 mph less than most that have run in similar summer conditions? My very mild H/C/I GTO (can't even hear it cam) with shorty headers and exhaust has been 116 on a 2600 DA day blowing through the clutch up top. There is something being lost somewhere, Id be really curious to see a datalog of the run and record knock retard and a/f ratio. Dyno tunes dont always equal a good street/track tune.

Exactly...get it running "good" on the dyno...then finish dialing it in on the track, that's where/how you'll get the best performance from it.

[DangerZL1]

Originally Posted by sammyv

Tpower what heat exchanger are you running? Do you feel it's helping?

I think he's running Torq's heat exchanger. I agree the car should be quicker with 100 hp more than stock going to the wheels. Too bad a stock ZL1 isn't running 11.8ish.

[tpower]

best time was 11.7 @ 123 we are goning to retune tomorrow and hit the track friday with hopefully good news !!!! Its going low 11's this year and then Road course racing!!!!

[MarcInUtah]

Congrats!

[jimmy5]

Hey, move your IAT sensor to inside the cold air box. I bet that lowers your ET's just from that right there.

[BoostedX2]

So has anybody documented timing being pulled at hi temperatures? I know Ted Jannetty is working on this. it would be great to know accurately how much power is being lost in 100+ degree temperatures like here in Louisiana which is most of the year. I would use that baseline to begin mods..

[BlackinBlack]

I have been wondering about the trap speeds on all ZL1s. They just seem low for a 580HP car. I must have under estimated the HP on my cars. (Funny as most people over estimate.) My 94 Mustang GT on the scale at the track weighed 3400 pounds with me and a quarter tank of gas. It would trap consistently @ 120 Mph and I estimated 400 crank HP at the time. Guess that number was low. (Must have been closer to 450 rwhp) That was with a centrifugal supercharger @ 6PSI on a mild pushrod Ford 302. Car ran high twelves on a radial tire spinning through 3 gears.

I dyno'd the next motor for the same car and it made crank 670 HP (666.7 to be honest and that was on a 100+ degree humid FL day.) So around 550 rwhp. Car would push high 130 Mph and on a good air day it was right at 140 Mph trap speeds. The car ran a 10.20 with a crappy 1.8 60ft. (If I left too hard it would go to the back bumper on the slicks.)

I was always told 100 Lbs = a tenth

So a ZL1 weighs about 4400 with driver? With 600 rwhp I would figure it should run a 120 Mph trap and a 11.1 - 11.5 second et. So the numbers I guess are not that far off. Just wonder why the modded SS cars are turning some much higher numbers for the same HP. Suspension setup?

[rmyers]

Great video. What area do you think you can improve on the most. Didn't the factory guys spend a day at the track and dip into 11's with stock cars and DR's? If I am wrong please forgive me. With 120-125 more HP at the wheels than stock, what are you looking to run realistically?

[jleews6]

Originally Posted by Higgs Boson

that's because these aren't drag cars. they are IRS, stiffly sprung, 4000 lb monsters, over engineered for corners.

yes, 118 mph is 425rwhp territory with a 3000 lb car geared and sprung for the strip.

My 03 Cobra went 121 in 90* heat with 430rwhp @3700 pounds on Nittos. There is something holding this car back and like others have said,it's probably the timing being pulled. With his power and a good day at the track with everything working like it should I wouldn't be surprised if this car didn't run in the tens or real close to it.
TPOWER It's good to see your going back to the track with a drag racer. He will know all the tricks to making a car run like it should.
Good luck.

[tpower]

Originally Posted by jleews6

My 03 Cobra went 121 in 90* heat with 430rwhp @3700 pounds on Nittos. There is something holding this car back and like others have said,it's probably the timing being pulled. With his power and a good day at the track with everything working like it should I wouldn't be surprised if this car didn't run in the tens or real close to it.
TPOWER It's good to see your going back to the track with a drag racer. He will know all the tricks to making a car run like it should.
Good luck.

We will get there, like you said a couple of tweeks and get my tuner at the track with me and take the datalogger for a ride, we will get low 11 or high 10 I will be more then happy. Im not putting a cage in the car so low 11's is the magic number.