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1st time track evaluate

 
Old 09-22-2018, 04:39 AM
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Default 1st time track evaluate

Hello all,
Went out to Joliet Rt. 66 last night for final test and tune. 2002 Z/28 t-56 long tubes ory 3" catless to single Magnaflow to the bumper. Didn't care too much about the times but the car was going through the lights at 107 plus on the limiter in 3rd. Ran it 3 times all very close. I think this was on par with what the car could do stock when it was new? If so, why would someone replace the factory manifolds and emissions equipment for zero gains? Stock wheels and 3.42's.
THANKS
Chuck
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Old 09-22-2018, 08:24 AM
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Is the car tuned? 107 trap speed is usually I bit better than what I normally see out of a bone stock LS1. Usually I see more like 104-105 mph, but of course track conditions play a big part as well
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Old 09-24-2018, 12:56 PM
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Just posting MPH numbers is not a comparison, you would have to post ET's. The writers that drove the cars for the original tests - it was also likely their first trip down the track with the car.

Al
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Old 09-27-2018, 09:05 PM
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Post the slip if you can
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Old 09-28-2018, 07:12 PM
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Thanks for the replies. I'm waiting on the pic to be approved by a moderator?
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Old 09-30-2018, 08:01 AM
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Originally Posted by NorasHot View Post
Thanks for the replies. I'm waiting on the pic to be approved by a moderator?
type it out ? (full slip)
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Old 10-01-2018, 10:16 AM
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60' 2.71 2.53. 2.66
330. 6.56 . 6.27. 6.59
1/8. 9.57 . 9.22. 9.59
Mph . 82.7 . 84.4 . 83.25
1000. 12.09 . 11.7. 12.09
Time . 14.21. 13.79 . 14.19
MPH. 105.42 . 107.17 . 107.09
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Old 10-01-2018, 01:18 PM
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check tune if never tuned after headers it could be running lean. you need traction so better tires & i'd add LCA's at least (lower control arms). stock magazine says 13.5 to 13.8. with headers . tune & traction you should be near 13 flat. last simple ? do you have an aftermarket air lid? (first mod). just my one cent.
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Old 10-02-2018, 05:40 AM
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Yes sorry it does have an SLP lid on it. I still think the MPH was down which I believe is the true indicator of the cars power? I wouldn't really care if it went 14 flat if it was trapping 110 plus. Wasn't really looking for quick times as I don't want to severely shock the driveline on hard takeoffs.
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Old 10-02-2018, 06:25 AM
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the sixty foot plays a part also on your overall trap speeds.
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Old 10-02-2018, 06:57 AM
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most of the stock-ish Fbodies I see at the track cut ~2.10 60' times deep staged on street (not drag) radials for mid/high 13s in 2-3k D.A. conditions.
work on your launch and look for a better tire, you can apply the power sooner with traction (more time at WOT, less time pedaling)
I've seen cases where improving 60' lowered mph but NH's slips don't look that way (yet).
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Old 10-02-2018, 06:10 PM
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Thank you all so much for the constructive input. I think I'm going to try it one more time at the track before the season is up in search of a 110 pass.
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Old 10-03-2018, 08:35 AM
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I would concentrate on the ET's. As long as you are WOT the whole run, the MPH won't change unless the WHP changes.

Al
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Old 10-03-2018, 11:48 AM
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Originally Posted by T6Rocket View Post
I would concentrate on the ET's. As long as you are WOT the whole run, the MPH won't change unless the WHP changes.

Al
So do you think the MPH is in line with the mods that have been done to the car? I'm thinking something is off
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Old 10-03-2018, 07:26 PM
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Originally Posted by NorasHot View Post
So do you think the MPH is in line with the mods that have been done to the car? I'm thinking something is off
​​​​​​Yes I think they are exactly where they should be for 2.50 ish 60 foot times. If you did not spin and you eased off the line like pulling away from a traffic signal that explains alot of the low MPH.

Our stock tuned, lid, drag radial 02 WS6, 6 spd. at over 3,665 lbs race weight ran many 107 mph+ passes with 1.95 to 1.99 60 foot times in the 13.07 to 13.13 range. It also pulled off 12.75 at almost 110 on a 1.80 60 foot time in good air and backed that run up same day with a low 12.90 with a slower 60 foot time.

If the 60 foot times where like yours coming off the line easy they would have been 103 to 104 mph passes easy.

Also on the limiter in third kills MPH go ahead and shift into 4th and you willl see a difference.

Hope this helps.

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Old 10-04-2018, 05:59 AM
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"If you did not spin and you eased off the line like pulling away from a traffic signal that explains alot of the low MPH."
Haha that's exactly how I drove the car that night. Out of the gate at idle.
Next rip, I will try and bring it out a bit harder.
One thing I also noted was that after just cleaning the tires off prior to staging the idle was kind of hanging up at 1500 for a brief moment. I assume they all do it? Seemed wierd that it didn't drop immediately after pushing the clutch in.
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Old 10-04-2018, 08:15 AM
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A pedestrian launch VS a full on drag launch won't make much difference in MPH, even though in theory it might seem like it would. I have bogged launches in a manual trans car before and saw no difference in MPH VS a good launch. As long as you are WOT the whole run, the true MPH will come out. I have hundreds of good and not so good runs to back that up.

The "launch" part of the run only lasts the first 10-15 ft out of 1320 ft, that's why it doesn't hurt MPH. However, deviations at the top end can change the MPH drastically, ie: letting off, or stretching out a gear farther than it should. I agree that you need to hit 4th gear, that should help MPH.

Al
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