CavPat

So I finally made it to the track for the first time last night. My car is a '99 Z28 with FRA, Lid, Ported stock TB, Ls6 IM, 221/221 .558/.558 114 cam, Pacesetter LT's, ORY, Magnaflow C/B. M6 with Pro5.0 and Lou's Short Stick, Ram Powergrip HD clutch. I have 17x9.5 chrome ZO6 wheels and 275/40/17 Sumitomo HTRZ tires on all 4 corners. I set the rear tire pressure at 27psi before I went to the track.

The track is at 300ft elevation, and the temp in the air was 74, the track temp read 95.

I made 3 runs, and these were my best times:

R/T: .810
60': 2.309
1/8: 9.075
MPH: 85.39
1/4: 13.586
MPH: 112.91

My MPH was pretty much where I expected it to be, I just need traction and the driver mod. Any helpful advice would be much appreciated.

-Edit-
Oh, I did a 2nd gear burnout for all my runs, dumping the clutch between 3000-3500 RPM's. My first run I launched just over 2000RPM's and got my worst 60' time. For the time posted above I just went off idle. (stock 10 bolt)

99_ls1_z28

iTrader: (8)

You need drag radials to run better. Your 1/8 mile mph is low, maybe because you are spinning so much.

qwk93ta

iTrader: (13)

Your 60' time is killing you.......

CavPat

You both are right. I was roasting the tires through 1st, 2nd, and into 3rd. I know I was spinning well beyond the 60' mark. It felt like I was on ice half-way down the track. I'm going to get some drag radials soon, but I was wondering if there's anything I can do in the meantime to improve my traction with these lousy Sumitomo's.

qwk93ta

iTrader: (13)

Get SFCs, LCAs and a good torque arm and you will hook a lot better.

CavPat

I've got LCA's and Relocation brackets sitting in my garage, just need to install them. Planning on getting a T/A sometime in the near future. Do SFC's really help in the 1/4?

Goat2NV

iTrader: (19)

Get some more seat time and your times will improve. I'm assuming this was at Capitol Raceway?? The Sumitomos will hook a little, but you have too much psi in them. I've got a set of M/T 255/50/15 drags if you'd like to try them out.

ndfrsd6

iTrader: (5)

if you go with a drag radial be CAREFUL ! your 10 bolt will not last long !

qwk93ta

iTrader: (13)

SFCs did not help my 1/4 mile time at all, however, they are cheap insurance so you don't twist your car up.

CavPat

Thanks all. I appreciate the offer Goat2NV, and yes it was at Capitol. I'm going to play around with my Sumitomo's for probably a couple more weeks before I get a pair of drag radials. I have a set of 16x8 inch wheels in my garage, and I think I'll eventually put those wheels on with some 255/50/16 DR's on the rear. I don't plan on leaving too hard with them and the stock 10 bolt, I just want to get sub-2-second 60's and see where I'm at then.

greatskiiiier

iTrader: (10)

general rule of thumb is .1 in the 60 is .2 in the 1/4- so your good for 12.1 with a 1.6 60 (real hard launch for your 10 bolt) aim for low 12s though

Villain281H

iTrader: (5)

As mentioned above, the early part of the run is where you are losing the most time. 112 mph fully hooked up with a 1.6 or better 60 foot should net low 12s, but as mentioned your 10-bolt will be hating you for it. There are a few 6-speed launching tip threads in the tech section if you do a search to see what has worked for others. We all have to start somewhere, and at least you know seat time and a few changes will get you better results.

Good luck, and have fun getting new PB!

Derek