First time at the drag strip, can some one analise my slips?

[svxsubaru1]

Last night i headed down to pacific raceways, for the open draging, i managed to get 4 runs in. From 15.924, to 15.504. My car is a 92 SVX, 5spd, 4.11 with a spec stage 3 clutch, header back exhaust, and a ecutune stage 1 chip. I pulled the spare out, and that was about all for weight reduction. My clutch was slipping throught 1st, and some of seconed for all runs. I would usally drop the clutch at 3.5-5K the lower drop netted my faster 60 foot times probley becasue of less clutch slip. I thought my last 60 foot was OK, but i would of liked to get down to 2 flat. The only thing that concerned me was my MPH at quarter seemened alittle low, i thought i was going to be in the 92, 93 range. It may of been becasue i had to either shift into 4th, or ride 3rd out to above 7k. The temp out side was in the low 60s so it was pretty good draging. Next time i go iam going to brind some ice to pack on the intake manifold to what times i can net. I was hoping for a high 14 sec pass, but it seems like iam pretty far away from that now.


Run 1 slowest
r/t .619
60 2.415
330 6.744
1/8 10.315
MHP 69.68
1000 13.345
1/4 15.924
MPH 87.65

Run 3 fastest run

r/t .745
60 2.234
330 6.465
1/8 9.964
MHP 70.88
1000 12.958
1/4 15.504
MPH 88.79

[TomsSVX]

Not bad at all... With the temps that low in a 4.11 5mt you should be on the boarderline of 14's though. I think if you shift shorter than 7k rpm you may be better off. There is a lot of scratch over the scanners about the MAF maxing out of people at high rpms. This tells me that the lower rpm you shift at the better. I tend to shift just under 6k for my best times. A good launch is key also. My best 60' time was 2.02. Work on good shifts and good launches and you will be in the 14's easy.

Tom

[Chiketkd]

Nice times. The temps were pretty favorable and I agree with Tomssvx about being able to squeeze into the upper 14's. How badly is your clutch slipping in 1st & 2nd?

-Chike

[svxsubaru1]

Well, I used to do be able to do small burn out, but now i drop it, and no burn out, the clutch complety grabs by 3rd gear. It still grabs farley hard it just dosent complety hold it any more, when i launch. I was usally shifting at around 6200 RPMs, but one run i let it go all the way out to about 7100, so I wouldent have to shift into 4th, and the I ran a 15.7??, with a 2.4?? 60 foot, at 88.???MPH

Can you think of any easy, and cheap mods nthat i can do by friday. I was thinking of bringing some ICE to pack onto the intake manifold.

[TomsSVX]

nothing is comming to mind. You could pull the intake resonator and pop the cornerlight out while racing. Thats about it

Tom

[SVXRide]

pull out the back seat and the passenger's seat - probably good for at least a .1 of a second....
-Bill

[oab_au]

You are asking a lot of the clutch. Dropping the clutch at 3500+ is asking it to hold a huge amount of torque. I reckond you would get better times bringing the clutch in around 2500, and let the torque accelerate the car.
Once the clutch starts slipping it heats up and looses a lot of grip.

Not much point in running up the rev range too far, the torque has droped off by then, about 5500/5750, then pull the next gear, you will still be in the torque range.

Harvey.

[TomsSVX]

Originally Posted by oab_au

You are asking a lot of the clutch. Dropping the clutch at 3500+ is asking it to hold a huge amount of torque. I reckond you would get better times bringing the clutch in around 2500, and let the torque accelerate the car.
Once the clutch starts slipping it heats up and looses a lot of grip.

Not much point in running up the rev range too far, the torque has droped off by then, about 5500/5750, then pull the next gear, you will still be in the torque range.

Harvey.

Like I said, a sooner shift will better your times, just don't short shift too much

Tom

[Subafreak]

You know I acctually run my RPMs pretty high, you guys are saying you shift just before 6K? Seems a little soon, hell at that rate I will be shifting into 6th by the end. But if it gets you your best runs I will give it a try.


BTW: Your toast Tom.

[Phast SVX]

Originally Posted by Subafreak

You know I acctually run my RPMs pretty high, you guys are saying you shift just before 6K? Seems a little soon, hell at that rate I will be shifting into 6th by the end. But if it gets you your best runs I will give it a try.


BTW: Your toast Tom.

i usually rev out to 6500 as well....
phil

[NikFu S.]

Next time you go out try not dropping the clutch off the line.

On successive runs rev 1k higher per run, and shift a little earlier.

You have to find where it's comfortable.