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

batman_4 · 04-25-2009, 04:02 PM

Quote:

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 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.

m4a1mustang · 04-25-2009, 08:44 PM

What are your 60 foot times? For a newb that should be all you need to work on.

Solus · 04-27-2009, 06:37 AM

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.

batman_4 · 04-27-2009, 12:41 PM

Quote:

Originally Posted by m4a1mustang

What are your 60 foot times? For a newb that should be all you need to work on.

+1

Quote:

Originally Posted by Solus

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.

Solus · 04-27-2009, 09:01 PM

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

Solus · 04-29-2009, 12:59 PM

I guess the times didn't help too much?

The HACK · 04-29-2009, 06:41 PM

What was your rear tire pressure?

Solus · 05-03-2009, 08:39 AM

right around 35psi

batman_4 · 05-03-2009, 04:53 PM

you need to work more on that 60ft, practice the feathering and the 60ft should drop

The HACK · 05-04-2009, 01:20 PM

Quote:

Originally Posted by Solus

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.

ianthegreat · 05-04-2009, 07:12 PM

Quote:

Originally Posted by Solus

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.

ianthegreat · 05-04-2009, 07:25 PM

You guys should start uploading your slips to Nissan 370Z 1/4 Mile Drag Racing Timeslips - DragTimes.com

Solus · 05-06-2009, 07:48 AM

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.

ianthegreat · 05-07-2009, 10:50 AM

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'

Solus · 05-13-2009, 03:03 PM

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)

04-25-2009, 08:44 PM	#17 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6963	What are your 60 foot times? For a newb that should be all you need to work on. __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

05-03-2009, 04:53 PM	#24 (permalink)
batman_4 A True Z Fanatic Join Date: Dec 2008 Location: McAllen Tx. Posts: 1,038 Drives: '09 PW 370Z Rep Power: 368	you need to work more on that 60ft, practice the feathering and the 60ft should drop __________________ '09 6spd. Touring: Eibach / SPC / Motordyne / Berk / Z1 / Oneighty / Mines / SSR / Stillen / CFE

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04-27-2009, 06:37 AM	#18 (permalink)
Solus Enthusiast Member Join Date: Apr 2009 Location: Jacksonville, NC Posts: 453 Drives: 2009 Nissan 370z Rep Power: 17	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.

04-27-2009, 09:01 PM	#20 (permalink)
Solus Enthusiast Member Join Date: Apr 2009 Location: Jacksonville, NC Posts: 453 Drives: 2009 Nissan 370z Rep Power: 17	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

04-29-2009, 12:59 PM	#21 (permalink)
Solus Enthusiast Member Join Date: Apr 2009 Location: Jacksonville, NC Posts: 453 Drives: 2009 Nissan 370z Rep Power: 17	I guess the times didn't help too much?

04-29-2009, 06:41 PM	#22 (permalink)
The HACK Base Member Join Date: Apr 2009 Location: California Posts: 40 Drives: '06 BMW MZ4 Coupe Rep Power: 17	What was your rear tire pressure?

05-03-2009, 08:39 AM	#23 (permalink)
Solus Enthusiast Member Join Date: Apr 2009 Location: Jacksonville, NC Posts: 453 Drives: 2009 Nissan 370z Rep Power: 17	right around 35psi

05-04-2009, 07:25 PM	#27 (permalink)
ianthegreat Base Member Join Date: Mar 2009 Location: TEXAS Posts: 171 Drives: 08 335i, 86 Ranger Rep Power: 17	You guys should start uploading your slips to Nissan 370Z 1/4 Mile Drag Racing Timeslips - DragTimes.com

05-06-2009, 07:48 AM	#28 (permalink)
Solus Enthusiast Member Join Date: Apr 2009 Location: Jacksonville, NC Posts: 453 Drives: 2009 Nissan 370z Rep Power: 17	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.

05-07-2009, 10:50 AM	#29 (permalink)
ianthegreat Base Member Join Date: Mar 2009 Location: TEXAS Posts: 171 Drives: 08 335i, 86 Ranger Rep Power: 17	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'

05-13-2009, 03:03 PM	#30 (permalink)
Solus Enthusiast Member Join Date: Apr 2009 Location: Jacksonville, NC Posts: 453 Drives: 2009 Nissan 370z Rep Power: 17	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)