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<< needs a lot of help in 1/4 mile

Originally Posted by AARC51 So I should never fully release the clutch when launching/shifting into first? But for all the other shifts I should fully release the clutch? I put

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Old 04-25-2009, 05:02 PM   #16 (permalink)
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Originally Posted by AARC51 View Post
So I should never fully release the clutch when launching/shifting into first? But for all the other shifts I should fully release the clutch?
I put a hurtin' on the Guinness at the pub last night so my reading comprehension isn't 100% right now...
its just like accelerating at a normal light. when you accelerate and the car doesn't jolt back and forth you literally feathered the clutch. now do that but fast while launching the car and applying the adequate throttle needed until you "feel" the car hook then you release the clutch completely and apply throttle accordingly. for the other shifts i fully engage and disengage the clutch.....but as fast and smoothly as possible obviously.
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Old 04-25-2009, 09:44 PM   #17 (permalink)
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What are your 60 foot times? For a newb that should be all you need to work on.
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Old 04-27-2009, 07:37 AM   #18 (permalink)
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I am not sure lol, I will have to go get the slips when I get home, pretty sure they were high though like 2.3-2.5 don't quote me on that though I am really not positive.
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Old 04-27-2009, 01:41 PM   #19 (permalink)
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What are your 60 foot times? For a newb that should be all you need to work on.
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I am not sure lol, I will have to go get the slips when I get home, pretty sure they were high though like 2.3-2.5 don't quote me on that though I am really not positive.
Post them when you get the chance.
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Old 04-27-2009, 10:01 PM   #20 (permalink)
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Ok so apparently i got pissed and threw most of my slips away lol.. the wife had 4 in her pocket here are the times

Reaction: .7938
60 ft: 2.1530
330 ft: 6.0212
1/8 ET: 9.1442
1/8 MPH: 78.39
1/4 ET: 13.9620
1/4 MPH: 102.60

Reaction: .6200
60 ft: 2.3482
330 ft: 6.1971
1/8 ET: 9.3048
1/8 MPH: 79.79
1/4 ET: 14.2180
1/4 MPH: 100.25

Reaction: .9679
60 ft: 2.1969
330 ft: 6.0160
1/8 ET: 9.1021
1/8 MPH: 80.64
1/4 ET: 13.9122
1/4 MPH: 100.42


Reaction: 1.2449
60 ft: 2.1861
330 ft: 5.9231
1/8 ET: 8.9791
1/8 MPH: 81.53
1/4 ET: 13.7349
1/4 MPH: 101.65
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Old 04-29-2009, 01:59 PM   #21 (permalink)
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I guess the times didn't help too much?
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Old 04-29-2009, 07:41 PM   #22 (permalink)
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What was your rear tire pressure?
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Old 05-03-2009, 09:39 AM   #23 (permalink)
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right around 35psi
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Old 05-03-2009, 05:53 PM   #24 (permalink)
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you need to work more on that 60ft, practice the feathering and the 60ft should drop
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Old 05-04-2009, 02:20 PM   #25 (permalink)
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Quote:
Originally Posted by Solus View Post
right around 35psi
Here's a little tip I picked up from experienced and professional drag racers. On a street car drop the rear tire pressure down to ~20psi. For cars with a lot more HP than the 370Z (the few cars out there) drop it down even further. At 20psi it'll allow you to launch the car at higher RPM without having to feather the clutch as much to produce less wheel spin, the tires will deform more upon launch and it will drop your 60' time and ultimately result in a big improvement in the 1/4 mile for such a small adjustment.

Give it a try. The "sportsman" classes in NHRA typically will run rear tires as low as 12psi (that's practically FLAT!) with drag radials.
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Old 05-04-2009, 08:12 PM   #26 (permalink)
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Quote:
Originally Posted by Solus View Post
Car is bone stock, took out the tire and jack.

My reaction time sucks to be honest 0.9-1.2 typically.

Shifting right at about 7.5-7.7k

Windows up, radio and heat off, let out some air out of the tires... not a lot.. running at about 35 psi on the tires.
RT doesn't matter.
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Old 05-04-2009, 08:25 PM   #27 (permalink)
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You guys should start uploading your slips to Nissan 370Z 1/4 Mile Drag Racing Timeslips - DragTimes.com
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Old 05-06-2009, 08:48 AM   #28 (permalink)
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Next time I go I will take mine to work and scan them and upload them. Thanks for the help guys. And I will try dropping the pressure down quite a bit and see how that works out for me.
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Old 05-07-2009, 11:50 AM   #29 (permalink)
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I wouldn't drop them lower than 25psi to start. If you feel the back end wobbling side to side you may want to add more air. Keep your front tires at max pressure.

Lower PSI has given me 1.8's on stock RFT's. It can definitely improve your 60'
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Old 05-13-2009, 04:03 PM   #30 (permalink)
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Friday will be my final track day w/ my z, unless I go to Atl this weekend. If I go to ATL then I won't be able to go again. Reading some posts.. I think my biggest problems were tire pressure, launching at too high of an rpm, and not feathering the clutch. Want to see if I can top 13.7 stock (have to put my stock tires/rims back on)
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