Good Launching = Better 1/4mile times
04-13-2007, 10:34 AM
#21
Registered User
Thread Starter
iTrader: (1)
Join Date: Mar 2006
Location: Florida,USA
Posts: 674
Likes: 0
Received 0 Likes
on
0 Posts
thanks for the advice everyone, hopefully i will make it out tonight. 85degrees F just isnt atractive, but we will see how i feel at race time.
04-14-2007, 03:35 AM
#23
Registered User
Thread Starter
iTrader: (1)
Join Date: Mar 2006
Location: Florida,USA
Posts: 674
Likes: 0
Received 0 Likes
on
0 Posts
ok well got 3 runs in last night, and the best of the 3 was a 14.0 at 101mph with a 2.2 60ft. temp out side was around 75degrees. My other two runs were not so great with 2.4 60ft.....and 14.2 @ 100. Well i will keep on going utill i get this **** right, sorry noone to video. thanks again.
corey
corey
04-14-2007, 04:08 AM
#24
Originally Posted by thirty5ounces
ok well got 3 runs in last night, and the best of the 3 was a 14.0 at 101mph with a 2.2 60ft. temp out side was around 75degrees. My other two runs were not so great with 2.4 60ft.....and 14.2 @ 100. Well i will keep on going utill i get this **** right, sorry noone to video. thanks again.
corey
corey
04-14-2007, 10:27 AM
#26
Registered User
Thread Starter
iTrader: (1)
Join Date: Mar 2006
Location: Florida,USA
Posts: 674
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Alberto
Did you keep a log? What technique worked best for you?
I didnt keep a log but I did try something different each run.
1st run
27psi launch at 3,000 RPM (lots of spin and wheel hop, had to let off the gas) I dropped the clutch and put the peddle to the floor. time was a 14.2 w/2.4 60'
2nd run
24psi launch 3,500 RPM (ton of spin and had to let off big time) same i dropped clutch and floored it. 14.4 w/ 2.4 60' slowest time ever.
3rd run
dropped all the way to 17psi, (ONLY TIME I RAN ON RIGHT SIDE OF TRACK)
Launched at about 1,800 RPM, 2.2 60' and 14.0@ 101. Still spinning, dontthink it was near as bad though.
I have to say, my overall best in my Z career was a 13.8 @ 103 and when i think back on it it was on the right side of the track. I was trying to think which side i am usually on and i would say 90% im on the left, its easier to pull on the out side lanes when comming around for your next run. From now on im going to try and request that side, i think my car hooks up better on the right.
Wednesday I am going to hit it up again and hopefully a constant track day will earn consistantly better times.....
04-14-2007, 11:47 AM
#30
Registered User
Thread Starter
iTrader: (1)
Join Date: Mar 2006
Location: Florida,USA
Posts: 674
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by coachk
Nevermind I just watched the video...Did you see Jeremy (AUDIBLE) run his N/A car?
yea not his new one, but ive seen him run in the 10's before. Badass machine he has, his shop has done work on my car, hes a good guy.
Last edited by thirty5ounces; 04-14-2007 at 11:51 AM.
04-14-2007, 11:50 AM
#31
Registered User
Thread Starter
iTrader: (1)
Join Date: Mar 2006
Location: Florida,USA
Posts: 674
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Alberto
STOP DROPPING THE CLUTCH !!!! Its obvious you need to slip it more why dont you try that more next time!?
04-18-2007, 05:39 PM
#32
Registered User
iTrader: (3)
Join Date: Feb 2006
Location: Lexington, SC
Posts: 1,197
Likes: 0
Received 0 Likes
on
0 Posts
Im in the same boat as the OP here...Went to the strip tonight for the first time ever and the best I pulled off was a 2.24 60ft. with a 14.04 1/4 @ 102.29. I was doing the same thing with just dumping around 3000, so next time I'm gonna take Alberto's advice and try to slip more. Hopefully I can pull a 2.0 and break into the 13's. This was at Cecil btw.
04-18-2007, 05:43 PM
#33
Originally Posted by 2005daytonaZ
Im in the same boat as the OP here...Went to the strip tonight for the first time ever and the best I pulled off was a 2.24 60ft. with a 14.04 1/4 @ 102.29. I was doing the same thing with just dumping around 3000, so next time I'm gonna take Alberto's advice and try to slip more. Hopefully I can pull a 2.0 and break into the 13's. This was at Cecil btw.
04-18-2007, 05:54 PM
#34
Registered User
iTrader: (3)
Join Date: Feb 2006
Location: Lexington, SC
Posts: 1,197
Likes: 0
Received 0 Likes
on
0 Posts
I'll will tomorrow...I Need to use my parents computer so Ill put them up tomorrow. I got 5 passes in but only 3 are worth posting.
Got the time slips scanned now...so maybe you guys can give me some pointers for the next time out.
Got the time slips scanned now...so maybe you guys can give me some pointers for the next time out.
Last edited by 2005daytonaZ; 04-19-2007 at 01:55 PM.
04-21-2007, 01:49 PM
#36
Registered User
iTrader: (2)
Join Date: Jul 2005
Location: CA
Posts: 96
Likes: 0
Received 0 Likes
on
0 Posts
I agree slipping it is ideal but sometimes i just get too excited and dump it 
I'd have to say the single best thing that improved my launch was the 275/40/18 bfg kds that i have on my rears.
I know a lot of people CAN pull good times on the stock potenzas but i sure as hell wasnt able to (they had about 26k mi on them before i swapped them out.) When i dropped the pressure to < 28lbs in the potenzas my car was all over the place! hitting sideways in 2nd gear down the track.. kinda scarred me into getting better tires.
I'd have to say the single best thing that improved my launch was the 275/40/18 bfg kds that i have on my rears.
I know a lot of people CAN pull good times on the stock potenzas but i sure as hell wasnt able to (they had about 26k mi on them before i swapped them out.) When i dropped the pressure to < 28lbs in the potenzas my car was all over the place! hitting sideways in 2nd gear down the track.. kinda scarred me into getting better tires.
04-22-2007, 07:44 PM
#37
Banned
iTrader: (2)
Join Date: Aug 2005
Location: OC - So Cal
Posts: 1,228
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by 350Z_LEE
A lot of great advice here for you OP. When you go to the track, don't worry about the light until you get the car dialed in. That can make you jump the gun sometimes. Once you have that sweet spot figured out then practice cutting the light. Make sure you notate, or mentally remember what rpm incriment you are at also, so you know how to adjust and improve it. Good luck. P.S. I have an open diff and cut a 1.79 on Dr's a couple times, but my norm is a 1.9-2.1. I need a LSD badly.
04-22-2007, 07:59 PM
#38
Registered User
iTrader: (32)
Join Date: Mar 2005
Location: dartmouth
Posts: 3,148
Likes: 0
Received 0 Likes
on
0 Posts
You can launch really well with an open diff. Its all about loading the drivetrain a little, and a nice smooth slipping of the clutch. Better tires are clearly more important.
04-22-2007, 08:04 PM
#39
Banned
iTrader: (2)
Join Date: Aug 2005
Location: OC - So Cal
Posts: 1,228
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by bacalhau16
You can launch really well with an open diff. Its all about loading the drivetrain a little, and a nice smooth slipping of the clutch. Better tires are clearly more important.
04-22-2007, 09:23 PM
#40
Registered User
iTrader: (6)
Join Date: Jan 2007
Location: DeLand, Florida
Posts: 1,844
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by GG_VQ
If I had a clutch I'd be able to finagle a bit... I'm AT open diff... I manage 2.123 60' but that's about it... If I rev even to 2K or 2500 I spin like crazy. So for now I just floor it off idle... any better suggestions than what Im doing?...