Last time at the track I was having traction problems. I was spinning out of the hole for about 12 ft before the car would hook.

I have now went to Hoosier QTP's 26x9.5 with 3.5 draglites up front and 15x8 in back. I lost 56 Lbs with this tire/wheel combo.

Here is my last timeslip. The temp was around 92*.

60 ft----------1.8441
330ft----------5.3389
1/8 mile ET-----8.2221
1/8 mph--------85.24
1/4 mile ET-----12.8322
1/4 mph--------107.07

Does the mph/et sound right? I know if I hook the et should pick up.

What do you guys think I will run with the new tires & weight loss in cooler weather.

Motor and trans combo is in my sig.

thanks.

 

drop that 60' and then your car would ET better. I ran 13.0 at 102 with a 305 dead hooking, your motor with AFRs should be low 12s at least, something is wrong with the combo.

What I would change

750 dp holley or proform 750 mech secondaries
3500 stall

have you played with timing yet for best mph? How about jet changes for best mph?

If the car is spinning then hooking, you need more weight transfer, try loosening front strut setting and make sure the car doesn't squat.

 

I have played with the timming. It is set a 40* right now. It seems to run and start fine. We have changed the jets a couple of times. The plugs look just right for now. I might have to adust them for cooler weather.

I hope to upgrade to a holley HP in the near future.

Also, I am running stock wore out rs shock and struts. Might be time for a upgrade.

The stall is rated for 2700-3000. Im not sure what it is flashing to, but I was thinking the same thing about the 3500.

Im sure there are some 12.50's or 12.40's in it. I just wonder what my et should have been in the 1/8th with the mph? Maybe 7.90's?

 

usually the stock wore out front struts help in the launch, but if the rear squats I would stiffen it up with air bags, etc. If anything you want the rear to lift and create more wheel gap, or stay the same. 40* is on the higher side for timing, but if that's what gets you the best mph then I would stick with it.

 

i know the weather was hot, but whats the altitude up there?

i'd expect a 355 with AFR heads and a 282HR cam to be doing a LOT better than 107 mph.

alot milder cams will go that fast. i'd expect that cam and head combo to put down somewhere near 360-375whp. that should be closer to bottom 12's at 112-114mph. my buddy's car put down near 370whp untuned in a cammed LS1, and ran low 12's with a slipping clutch, 1.7x 60 foots at 114 mph.

your combo dead hooking should net high 1.6 60 foots i'd say, and with that .2 second gain in the 60 will translate to near .5 seconds in the 1/4 mile. thats low 12's right there. 107mph trap speed is good for low low 12's. my neighbor's nova goes 12.0's at 110 now i believe. it was doing 12.4's at 106 with a bad tune. I also raced a olds 442 that went 12.3 at 106 at the track

 

The track is 1200ft above sea level.

Also, The motor is stock bore with stock pistons, rods and crank.

I know that 40* is a little on the high side, but the motor really seems to like it.

The old M/t Indy profile SS tires I was running just wouldnt cut it. That was the reason for the spinning. I havent been to the track with the Hoosiers yet, but they work great on the street so far.

Oh yeah guys, After dropping the 56lbs with the tire/wheel combo, the car with me & 1/2 tank of gas is 3374 lbs.

Oh yeah, what about some 50/50 shocks in the back. The front springs are low miles 92 z28 springs and the rear are wore out rs. Should I go with a different spring in the back? Also I have removed the front swaybar, but the rear is still the small one from a rs.

 

comp engineering makes nice 3 way adjustable rear shocks that are cheaper than lakewood 50/50s

 

that car that light and with that combo should definately be running faster.

just go see what the new hoosiers do. they will hook and you'll be moving well

 

Hey first things first, what kind of gas are you running? 40* of timing sounds like TOO much with an efficient cylinder head like an AFR. If you go to their website www.airflowresearch.com and look at their dyno #'s, all of their best runs came from 34*-36* of timing. With my old setup, 2* too much (or too little) timing was worth 2 tenths and 2 mph. Depending how soon your advance is coming in, that much timing was probably causing your traction problems too!

My car also went 5.3's in the 330' with the same 60' that you have so I really do think your timing is holding you back up top.

Take your timing back to 36* total, I would bet money that you will pickup 3-4 tenths and 3-4 mph.

 

My brothers 86 Mustang was going 12.76-12.84 all day long with bogging 1.78-1.84 60's. On the last pass he got a 1.73 60' and nabbed a 12.54 @ 107. I would figure with your car being similar in 60', mph, and times get that 60' down and you should go 50s or 40s!

 

At the time of that run, I was running 1:1 93 and 110 at half tank.
I will try the timming again next T&T. Also I am running a MSD probillit dist without a vaccum advance.