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Old 04-21-2012, 12:02 AM
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Time slip?

Ok, Just wondering if anyone would take a look at my time at the track to see if my goal is possible! I only ran it twice. I would like to run atleast a 6.99 or 7.0 in the 1/8th mile with this full trim chevelle. 1.7387 60ft---
4.9873 330ft---6.7510 ET @ 594 ft----(1/8 mile ET 7.2731)----86.19 MPH
Would a lower 60ft time get me to the 6.99 or 7.0 goal? Still needs some fine tuning, but I'm still happy with it. Seems to run pretty good for a street car. Thanks!

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Old 04-21-2012, 03:53 PM
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Old 04-21-2012, 03:59 PM
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What rear gears are you running, RPM through traps?
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Old 04-25-2012, 09:22 PM
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Quote:
Originally Posted by poncho62
What rear gears are you running, RPM through traps?
Im running 4.10 gears, but honestly I just ran the two runs and really did'nt pay attention to the rpm's at the end. I have my rev limiter set at 5,900 and it was'nt hitting it. Really not sure! I'll have to pay attention to that next run. It is mainly a street car and has a 26" tall rear tire. If that helps any.
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Old 04-25-2012, 09:41 PM
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The mph seems a low for the et to me! i would think 94-97 mph. 1.7xx 60 foot did it spin at the start, if so get it down to 1.5x and i would think you are real close to 7.00.
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Old 04-25-2012, 10:05 PM
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Quote:
Originally Posted by 396chevelle
Ok, Just wondering if anyone would take a look at my time at the track to see if my goal is possible! I only ran it twice. I would like to run atleast a 6.99 or 7.0 in the 1/8th mile with this full trim chevelle. 1.7387 60ft---
4.9873 330ft---6.7510 ET @ 594 ft----(1/8 mile ET 7.2731)----86.19 MPH
Would a lower 60ft time get me to the 6.99 or 7.0 goal? Still needs some fine tuning, but I'm still happy with it. Seems to run pretty good for a street car. Thanks!
Get slicks on it. Your 60' time doesn't jibe w/the ET, either spinning too much, wrong stall or your launch technique needs work.

Also, most guys will over rev before shifting. Be sure to hit the shift points that you have calculated for the engine's power band- shift just past the HP peak so the rpm drops down into the meat of the powerband. If the engine wasn't dynoed, this will take some trial and retrial to find the sweet spot. Use a shift light. Short shifting, while usually being less often a problem, will still ruin the ET, too.
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Old 04-26-2012, 08:33 AM
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Quote:
Originally Posted by onlyfnway
The mph seems a low for the et to me! i would think 94-97 mph. 1.7xx 60 foot did it spin at the start, if so get it down to 1.5x and i would think you are real close to 7.00.
It spun very little, but I'm sure thats enough.
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Old 04-26-2012, 08:43 AM
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Quote:
Originally Posted by cobalt327
Get slicks on it. Your 60' time doesn't jibe w/the ET, either spinning too much, wrong stall or your launch technique needs work.

Also, most guys will over rev before shifting. Be sure to hit the shift points that you have calculated for the engine's power band- shift just past the HP peak so the rpm drops down into the meat of the powerband. If the engine wasn't dynoed, this will take some trial and retrial to find the sweet spot. Use a shift light. Short shifting, while usually being less often a problem, will still ruin the ET, too.
I did hit the rev limiter for a split second on the last/best run. Peak power on dyno was around 5,500 so I shift at 5,900. I have a 496 with a turbo 400 and 3,500 stall and 4:10 gears. Probably need to run it a few more times and work on a little better technique like you say. Thanks for the replies!
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Old 04-26-2012, 01:29 PM
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Quote:
Originally Posted by 396chevelle
I did hit the rev limiter for a split second on the last/best run. Peak power on dyno was around 5,500 so I shift at 5,900. I have a 496 with a turbo 400 and 3,500 stall and 4:10 gears. Probably need to run it a few more times and work on a little better technique like you say. Thanks for the replies!
You should try shifting closer to 5500, like just past, the torque and gear ratio will help you a lot.
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