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Old 02-12-2009, 04:29 PM   #1
Jhovany
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Default Wierd 1/4mile question!!!!!

Just wondering for all you 1/4mile guys, what does it mean when your trap speed increases but at the same time your ET increases also? A little background....I ran a 12.6 @ 108mph with a 60ft of 1.8 and after the installation of cosworth shortblock and header I ran a 12.8 @ 115mph with a 60ft of 1.8. Not too huge of a drag guy but I just found this very odd. If this is in the wrong forum please place where needed! Thanks!
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Old 02-12-2009, 04:33 PM   #2
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et is more indicative of the driver, whereas mph in more indicative of the car. you are obviously making more power, hence the mph, but the driver mod needs tweeked on the new setup.
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Old 02-12-2009, 04:43 PM   #3
Jhovany
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aaaaaa I C......I can understand that! Oh and another thing.....when I ran the 12.6 I was on pump gas and when I ran the 12.8 I was on 101oct (yes I got tuned on race gas and by Clark Turner)
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Old 02-12-2009, 05:54 PM   #4
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crappy launch?
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Old 02-12-2009, 05:55 PM   #5
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Sounds like someone is trying to advertise for Cosworth
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Old 02-12-2009, 05:56 PM   #6
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Default To clear up burnin4's reply. . .

Assuming equal shifts in 2 cars, at the proper rpm, 1/4 trapspeed is directly proportional to HP.

The reason I say it that way, is because someone who's granny shifting a 500hp car can still run 115mph in the 1/4. While the guy making the lightning quick shifts, may be able to run the proper 120+mph traps.

1/4 et is dependent upon your 60ft (or 330ft, or 1/8th, depending on your hp, etc). Basically, is the car spinning or bogging?
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Old 02-12-2009, 06:00 PM   #7
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did you noticeably take it to higher rpms or drive it harder before the build?
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Old 02-12-2009, 06:08 PM   #8
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Quote:
Originally Posted by fulie View Post
did you noticeably take it to higher rpms or drive it harder before the build?
Im confused. What turbo is this with???
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Old 02-12-2009, 06:10 PM   #9
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Quote:
Originally Posted by fulie View Post
did you noticeably take it to higher rpms or drive it harder before the build?
I could swear I was TRYING EVERYTHING I possibly could to drive the car hard after the build. And asfar as the launch goes....I wouldnt say I had a bad launch (even though I dont consider 1.8 a good 60ft) because I had the EXACT same 60ft as the time i ran the better time. The ONLY thing I can think of that MIGHT have effected my times might have been the tires. But can tires really effect my times THAT bad?
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Old 02-12-2009, 06:12 PM   #10
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Quote:
Originally Posted by STi Mikey View Post
Im confused. What turbo is this with???
APS SR56.....I will be honest and say I am in no way, shape, or form a good driver......I truely think that it was my driving abilities but just thought I would ask anyway. How or why would the car be "pulling" timing and what does it feel like?
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Old 02-12-2009, 07:31 PM   #11
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^when your car pulls timing it falls on its face. And if that was the case you wouldnt have trapped what you did. And because Clark tuned your car I'm going to also venture out and say unless you were running some crappy gas or incredibly heat soaked the vehicle did not pull timing.

115mph trap speed indicates the car is accelerating well. The 12.8 indicates the driver isnt doing his part to get the car down the track. 115mph traps should get you into the 11's or the bottom of the 12's at the least. Understand you're comparing tenths of a second which can easily be lost in shifting.

If you want further analasis I recommend posting both runs showing exact times not just for 1/4 but also 1/8th mile. If your 1/8 mile is the same then it sounds like you might have to work on your first to second gear shift.
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Old 02-12-2009, 08:00 PM   #12
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Weather track conditions. Did you check to see if you were hitting peak boost? There are a lot of factors. Also, you may be shifting too early or too late. Maybe your clutch is going too. We can't really give you a good idea based on that information.
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Old 02-12-2009, 08:05 PM   #13
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you suck. thats it. should not run slower...
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Old 02-12-2009, 08:08 PM   #14
Clark Turner
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Your in New mexico in the mountains in high altitude

115 is not a bad trap speed. Showing the car is making great power. 12.8 is a bit on the slow side for that much power. I believe with some practice you will get this down to 12.2 to 12.4 without much trouble. The altitude just really hurts the 1/4 mile runs.

That car will surely run 11s and trap in the 120 to 122 range down here in PHX.

Cya


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Old 02-12-2009, 08:24 PM   #15
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Shifts were probably really good on the 12.6 and not so good on the 12.8. You probably just need a few times to get used to the new setup. I'm sure that the shift points are different
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Old 02-12-2009, 08:33 PM   #16
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Do you get full boost in all gears? Or do 1st and 2nd not quite get there before you need to shift?
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Old 02-13-2009, 12:21 PM   #17
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Jhovany, it's all driver. When I had the Dom3 I ran [email protected] here in Albuquerque. I have run as slow as 12.2 with 120mph traps ([email protected] with a mis shift to). Just get consistent on your shifts. On my new setup my highest trap was 122.1 with an 11.79 ET, but my best ET was 11.69 @ 121.9. You coming up this way this summer?
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Old 02-13-2009, 01:33 PM   #18
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Quote:
Originally Posted by 06rexwagon View Post
You coming up this way this summer?

Gosh....I sure hope I do!
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Old 02-13-2009, 03:08 PM   #19
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Quote:
Originally Posted by reddevil View Post
Do you get full boost in all gears? Or do 1st and 2nd not quite get there before you need to shift?
these are guesses based off what mine does......i have mine plotted out but cant get on photobucket right now.

1st is pretty close to redline

2nd 5500-6000

3rd 4500-5000

4th 4000-4500


I had this same problem with my 60-1. I got stuck at [email protected] and burnt 5-6 clutches before i gave up. Couldnt get below a 2.0 60 foot with that setup on the 5 speed.
First time out in the sti = 1.7 60's.....i hated the 5 speed + laggy turbos.

Quote:
Originally Posted by SubieWReX View Post
I'm sure that the shift points are different
with a 56 lb/min turbo you can take every gear to redline and stay in the powerband. his peak hp should be right around 6500rpm in 4th gear and should hold pretty well to redline. so 1-3rd definately go to redline.

Last edited by Phatron; 02-13-2009 at 03:16 PM.
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