[Z06] Extremely low trap speed 109mph
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Extremely low trap speed 109mph
I went to the drag strip the other night for the first time in my stock 02 Z06. I know my launches were terrible 
, but my shifts were spot on. The DA was in the negatives. A few other stock cars were getting their usual trap speeds, but not mine. So error in timing is probably not the case.
Here's one example of many mid 13's.
60' - 2.427
330 - 6.056
1/8 - 8.974
MPH - 87.77
1000 - 11.388
1/4 - 13.450
MPH - 109.03
There are no trouble codes. The car runs fine, gets great gas mileage and feels very powerful.
I'll be getting it dynoed in a couple of weeks to confirm this. I really hope that I'm just a terrible driver.
Will resetting the PCM be of any help?
, but my shifts were spot on. The DA was in the negatives. A few other stock cars were getting their usual trap speeds, but not mine. So error in timing is probably not the case.Here's one example of many mid 13's.
60' - 2.427
330 - 6.056
1/8 - 8.974
MPH - 87.77
1000 - 11.388
1/4 - 13.450
MPH - 109.03
There are no trouble codes. The car runs fine, gets great gas mileage and feels very powerful.
I'll be getting it dynoed in a couple of weeks to confirm this. I really hope that I'm just a terrible driver.
Will resetting the PCM be of any help?
Last edited by RA91725; Nov 21, 2010 at 04:42 PM.
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From: Bartlett, IL
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St. Jude Donor '06-'07-'08-'09-'10-'11-'12
No offense but it looks to me that the problem is the driver, if your getting 2.4 60' times I can pretty much bet that you are still leaving some things on the table in terms of shifting. You mentioned it was your first time at the track as well. Seat time and practice are the best mods for this car. The more time you spend at the track the better you will get, you will see that 60' time go down, trap speeds go up and the end product will be better ET's.
Good Luck
Good Luck
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Joined: Sep 2008
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No offense but it looks to me that the problem is the driver, if your getting 2.4 60' times I can pretty much bet that you are still leaving some things on the table in terms of shifting. You mentioned it was your first time at the track as well. Seat time and practice are the best mods for this car. The more time you spend at the track the better you will get, you will see that 60' time go down, trap speeds go up and the end product will be better ET's.
Good Luck
Good Luck
The launch has little to do with shifting... With my turbo miata I can do 2.1 60' at the same track and ran a 14.4 @ 94... which is pretty good. Granted the miata is painfully simple to launch compared to the Z06.
I just have to figure out how to launch this beast.
Basically my launches sucked, but my shifts were quick and accurate. No need to powershift to achieve a decent trap speed. Lots of people get 114+ while granny shifting. Maybe next time I will get a camera mounted and record the runs.
I'll go to the track again to get more runs in, I really want to get that 60' down to about 2.0-2.1.
Melting Slicks
Joined: Sep 2006
Posts: 2,728
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From: Iowa
For reference, my best run was a 13.02@112.8mph in my 01 z06. My 60ft was 2.237s. It was my only visit to to the track in this car and made about 5 passes.
Mods were: LG ProLongtubes, B&B Bullets, tuned (360/365).
I know I need to work on a lot, especially my launch. I lost traction in 2nd and went sideways a little spinning, so I need to work on my shifting and/or get better tires.
Still, your trap does seem a bit low. A lot would have to go wrong to get that low. I know I did several things wrong that I need to work on and still hit nearly 113mph.
Mods were: LG ProLongtubes, B&B Bullets, tuned (360/365).
I know I need to work on a lot, especially my launch. I lost traction in 2nd and went sideways a little spinning, so I need to work on my shifting and/or get better tires.
Still, your trap does seem a bit low. A lot would have to go wrong to get that low. I know I did several things wrong that I need to work on and still hit nearly 113mph.
Instructor
Joined: Jun 2010
Posts: 248
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From: TX
Whats the norm trap speed?
Took my 01' Z (mods: catback/c.a.i) and surprisingly pulled a 1.7 60ft on BFG kdw's & completed a 12.6 @ 110mph. I was really surprised the car performed that well. Car dyno'd 364.
Took my 01' Z (mods: catback/c.a.i) and surprisingly pulled a 1.7 60ft on BFG kdw's & completed a 12.6 @ 110mph. I was really surprised the car performed that well. Car dyno'd 364.
Race Director
Joined: Jul 2007
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From: Texas Hill Country
your 60 ft time is so slow that your trap speed is low.
think about it, if you basically are going so slow at 60 feet that you shorten the track length by 60ft then you will have less time/distance to build speed and your MPH is lower at the end.
as an extreme example of what I mean, your 1/8 mile MPH is WAY lower than 1/4 mile MPH due to less distance with meaningful speed accumulation.
you went 13.4 at 107.
if you go 12.5 you will see mph around 116, which would be normal.
think about it, if you basically are going so slow at 60 feet that you shorten the track length by 60ft then you will have less time/distance to build speed and your MPH is lower at the end.
as an extreme example of what I mean, your 1/8 mile MPH is WAY lower than 1/4 mile MPH due to less distance with meaningful speed accumulation.
you went 13.4 at 107.
if you go 12.5 you will see mph around 116, which would be normal.
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Drifting
Joined: Dec 2009
Posts: 1,321
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From: Columbus MS
your 60 ft time is so slow that your trap speed is low.
think about it, if you basically are going so slow at 60 feet that you shorten the track length by 60ft then you will have less time/distance to build speed and your MPH is lower at the end.
as an extreme example of what I mean, your 1/8 mile MPH is WAY lower than 1/4 mile MPH due to less distance with meaningful speed accumulation.
you went 13.4 at 107.
if you go 12.5 you will see mph around 116, which would be normal.
think about it, if you basically are going so slow at 60 feet that you shorten the track length by 60ft then you will have less time/distance to build speed and your MPH is lower at the end.
as an extreme example of what I mean, your 1/8 mile MPH is WAY lower than 1/4 mile MPH due to less distance with meaningful speed accumulation.
you went 13.4 at 107.
if you go 12.5 you will see mph around 116, which would be normal.
Your 60' is killing your trap speed.
With a 1.85 60' my stock 02 Z did 12.2 @ 115.
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4th gear.
I'll work on the launch. Once I get a lower 60', I'll report back.
For some reason I always thought that the 60' time was basically independent of the trap speed, as I've witnessed people with crappy launches get about the same trap speed as they do with good launches. Anyone had the same experience?
I'll work on the launch. Once I get a lower 60', I'll report back.
For some reason I always thought that the 60' time was basically independent of the trap speed, as I've witnessed people with crappy launches get about the same trap speed as they do with good launches. Anyone had the same experience?
Last edited by RA91725; Nov 22, 2010 at 08:08 PM.
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From: Texas Hill Country
4th gear.
I'll work on the launch. Once I get a lower 60', I'll report back.
For some reason I always thought that the 60' time was basically independent of the trap speed, as I've witnessed people with crappy launches get about the same trap speed as they do with good launches. Anyone had the same experience?
I'll work on the launch. Once I get a lower 60', I'll report back.
For some reason I always thought that the 60' time was basically independent of the trap speed, as I've witnessed people with crappy launches get about the same trap speed as they do with good launches. Anyone had the same experience?
technically, a tiny bit of roll out spin can help mph but you are spinning a LOT for a LONG time. it's not the same. you are spinning uncontrollably.
Drifting
Joined: Dec 2009
Posts: 1,321
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From: Columbus MS
It is horrible! haha but you will get better!
What tires are you running?
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I noticed that I was spinning a lot on the 1st to 2nd shift which I'm sure contributed to the crappy trap speed.
Drifting
Joined: Dec 2009
Posts: 1,321
Likes: 18
From: Columbus MS
Those are pretty good tires how old are they?
You should be able to pull of a 2.0 pretty easy. You should probably heat up the tires a little bit before hand.
Have you read the sticky on how to launch by ranger? There is some really good info in there if you are learning.
Well not a sticky like I thought but here it is..... http://forums.corvetteforum.com/c5-z...echniques.html
You should be able to pull of a 2.0 pretty easy. You should probably heat up the tires a little bit before hand.
Have you read the sticky on how to launch by ranger? There is some really good info in there if you are learning.
Well not a sticky like I thought but here it is..... http://forums.corvetteforum.com/c5-z...echniques.html
Last edited by BoostedEBZ06; Nov 22, 2010 at 09:29 PM.
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Joined: Mar 2000
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From: Bartlett, IL
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St. Jude Donor '06-'07-'08-'09-'10-'11-'12
With Pilot Sports and decent track preperation you should be able to pull sub 2.0 60' times with some practice (I went 1.80 on the stock Supercars). You also mention alot of wheel spin on the 1-2 shift. You are definately going to need to do a burnout to make the most of your launch as well as look for better traction on the 1-2 shift. Rangers tutorial would do you some good, he has compiled a good bit of useful info that can take a rookie racer miles ahead, learning good habits and info from the start can help you chip away at your ET's
Pro
Joined: Dec 2009
Posts: 606
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From: Waco Texas
They are indeed fun to launch! The factory weight transfer is not optimal at all being it's a corner carver and not a 1/4 mile car. That being said, the correct suspension can work wonders for making the crappiest of tires hook by putting most of the weight of the car on them at lauch.
You need to drop the air pressure in the tires to about 16 hot ,about 14 before a burnout and cold. The burnout should be about 3-5 seconds and just enough to warm the tires and get the debris off them from the pits. I ususally, after burnout, and before staging, romp it a few times to make sure she's biting and get any rubbery,oily residue off from the burnout. Stock tires just don't have the same soft rubber as a track tire so burnouts can actually make spinning worse if not cleaned off before launch.
Try and slip the clutch from launch and not drop the clutch violently. The hard hit of the wheel shock from a dump on hard sidewall tires will ensure wheelspin. Let it bog and go before you pull a JOhn Force spinnig down the track and you'll see your times dip at least 7/10ths. Hell you have an easy .5 just in launch and 60ft which will net you about 7/10ths on the big end.
You need to drop the air pressure in the tires to about 16 hot ,about 14 before a burnout and cold. The burnout should be about 3-5 seconds and just enough to warm the tires and get the debris off them from the pits. I ususally, after burnout, and before staging, romp it a few times to make sure she's biting and get any rubbery,oily residue off from the burnout. Stock tires just don't have the same soft rubber as a track tire so burnouts can actually make spinning worse if not cleaned off before launch.
Try and slip the clutch from launch and not drop the clutch violently. The hard hit of the wheel shock from a dump on hard sidewall tires will ensure wheelspin. Let it bog and go before you pull a JOhn Force spinnig down the track and you'll see your times dip at least 7/10ths. Hell you have an easy .5 just in launch and 60ft which will net you about 7/10ths on the big end.
