Question from my brother...track times

KENS89LX · Jun 24, 2007

He went to the track today and his best time was a 14.5/95mph. Its a 89 gt with f cam eldebrock upper lower, 1.6 rollers, underpulleys, 70mm throttlebody/maf, 3.73 aluminum driveshaft. He is shifting at 5700rpms, should'nt he in the high 13's. I mentioned that it was probably the street tires, but he said it was hooking up good.. his 60ft was 2.1. Any suggestions of what he could do? On his last run he broke after shifting into 4th the clutch pedal went to the floor and would not come out of fourth any suggestions?

ninety15.0 · Jun 25, 2007

I wouldnt say that 2.1 60' times are hooking good. I have seen plenty of people pulling 1.9x-2.0x on street tires. losing a tenth or two in the 60' will net you an extra 2 or 3 tenths at the 1/4. I think with good traction that combo should see high 13's. How many miles on the motor? stock short block i'm assuming? As for the clutch/tranny...check the cable, if not he probably broke something a little more serious. good luck

KENS89LX · Jun 25, 2007

Its stock bottom end, and he checked the cable it was fine.. would the clutch fork breaking do this?

redfox91 · Jun 25, 2007

what was his reaction time? Maybe he could shift at 6000.

GTOreturns · Jun 25, 2007

He should shift at alot lower RPM. I dont think your making too much power at that RPM with the stock heads.

86bluecobra · Jun 25, 2007

I think above 5500 rpm he isn't making very much power.

ninety15.0 · Jun 26, 2007

I was also thinking that 5700 was too high for stock heads. Im running gt-40's with a little work done to them and i still shift at 5500-5600. Maybe he should try shifting at 5000-5200.

Pod · Jun 26, 2007

my89blubyu said:
He went to the track today and his best time was a 14.5/95mph. Its a 89 gt with f cam eldebrock upper lower, 1.6 rollers, underpulleys, 70mm throttlebody/maf, 3.73 aluminum driveshaft. He is shifting at 5700rpms, should'nt he in the high 13's. I mentioned that it was probably the street tires, but he said it was hooking up good.. his 60ft was 2.1. Any suggestions of what he could do?

My best is a 14.21/98.8mph with the mods in my sig.
With a 95mph speed, I'd say around 14.5 is about right compared to other times I've seen.

RYC CUKR · Jun 26, 2007

Check the quadrant and make sure that the teeth aren't stripped. Mine would go to the floor when the quadrant went bad. You can usually pull the pedal back up with your foot and limp it to where you need to go.

BigHairyMonkey · Jun 26, 2007

redfox91 said:
what was his reaction time? Maybe he could shift at 6000.

reaction time would have no effect on trap or ET

I was also thinking that 5700 was too high for stock heads. Im running gt-40's with a little work done to them and i still shift at 5500-5600. Maybe he should try shifting at 5000-5200.

exactly. even with a MUCH better flowing Upper and lower your heads are killing you anywhere past 5000. I have a completely stock HCI, with a dying t-lok, horrid street tires (roadhugger 245s) and i still run 13.90s @ 99 w/ a 2.01 60 ft. I shift at 5200 and i drive it like i want to have a car to drive home. I think i can get 13.50s outa it on a drag radial or 13.80s on a better street tire. Its all in the launch and your shifts/shift points. practice makes perfect

redfox91 · Jun 27, 2007

Tell me why reaction time would have nothing to do with it? 13.9 is fast for no more than you have done.

smallstang393 · Jun 27, 2007

redfox91 said:
Tell me why reaction time would have nothing to do with it? 13.9 is fast for no more than you have done.

Reaction time is just that reaction the clock doesn't start untill you start to move so you could have a 30 sec reaction and still run a 10 through a 1/4 reaction is just how long it takes you from time lights drop till car moves

BigHairyMonkey · Jun 27, 2007

^ exactly. reaction times only matter when you're bracket racing, you dont trip the lights till you start rolling.

Question from my brother...track times

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