bad6as

iTrader: (17)

mine is a m6 with a 9" with 3.90's makes 390hp 360tq tq peak is 4800 so i dump it a lil over 5k.
i have e/t streets, stock shocks and spring with umi t/a sfc and lca's wrighs 3675 w/ me
w/ a 5k dump my best 60ft is a 1.67. it would squat hard and then teh front sway bar would pull the front back down, i put some kyb shocks on and the front lifts like it should but they didnt prep the track so i wasnt hooking. whell see how it lifts or squats if they have good prep next time i go. i have some pics and vids if u wan tto see them

BlackWS666

iTrader: (31)

My car hooks great after about 10-15 feet, but its that damn initial shock that makes the tires spin. Im going back to the track on Friday night, and am going to just run the 60 ft, and drop the pressure until it grabs. I also took a look at the angle of my LCAs today. They are angle downward toward the front of the car about 5 degrees. My relocation brackets will be here on wedensday, and hopefully that helps out alot as well.

02SOMWS6

iTrader: (6)

your tire psi raises as you do your burnout. On a stick car you should be anywhere between 9.5-12psi . As far as rpm your going to be between 6000-7000. Every car is different. I would start at 6200 and 11psi on the tires. Stick cars need lower psi than auto cars so don't listen to what a auto guy runs. Your also going to need to adjust your pnion angle. -1 to -2 should be good

ATwelveSec02Z28

iTrader: (17)

One thing I havent seen addressed is what is your RPM going through the traps?

28" tall tire with 4.11's at 6400rpm though the traps would be like 130mph. This causes 2 problems.

First, youre hitting the tires pretty damn hard with 4.11's and that big of a tire. The engine RPMs at launch probably drop significantly if you dead hook, or it doesnt hook.

Second, you are getting into 4th gear through the traps (3rd gear with 4.11's and 28" tire is about 100mph). Optimally you want to have your RPMs at max going through the traps.

My suggestion would be change to 4.56 gears. This will slow the rotation of the tire on the initial launch hit, and get your RPMs in a better range through the traps. You would probably drop atleast a tenth off your 60's gain a few MPH and tenths at the top.

ls2 bait

iTrader: (11)

id either step up the gear or go to a shorter tire. 28" tire is a lot for your combo from what i can see. but you def want to get the lcas level with the ground first from everything ive gathered.

WS6TransAm01

iTrader: (13)

Yes I forgot that..

Once again a "higher power" told me to get relocation brackets, and I did. I can't say that it made my car launch better, but it did make the car more consistant in less then perfect track conditions.

On a day when stock motor cars were spinning out of control and cars that normaly hook well were spinning on the 1-2 shift I was pulling consistant 1.43 60's and going dead strait down the track.

I would leave the LCA's in the top hole of the relocation bracket. When I lowered them all the way down, I went from pulling the wheels and doing a 1.43 60' to staying on the ground and doing a 1.50 60'

I don' care what anyone says, with a 11/10/9 second F-body, if you want to 60' you have to get the front wheels in the air.

BlackWS666

iTrader: (31)

Great information guys. I usually do run a 275/50/15 MT DR. But since I was having so many trackion issues I threw my 28s on just to see what would happen. When running my 26 tire @ 18 PSI my best time was:

60ft.-----1.813
1/8et.----7.913
1/8mph--89.619
1000ft---10.224
1/4et.---12.213
1/4mph-115.866

So my trap speed was no worse with the 28s then with the 26s. And the times were better. Should I still switch back to a 26 because its "recommended" and lose time? Should I throw the drag radials back on, and just keep lowering the pressure in them like I would on a slick?

ndfrsd6

iTrader: (5)

i run 1.50 60's on a 28' m/t dr and have dipped into the high 1.4's .....that was with 14lbs in my radials you defin. need 4.56's for a 28' tire though .........also get a two step it will make you crazy consistent...

BMR Tech2

iTrader: (5)

I would try a set of lca relocation brackets and a higher launch rpm.

ATwelveSec02Z28

iTrader: (17)

I would keep the 28" tire.... M6 hits hard, you want the sidewall to absorb some of the shock. Up the gear to a 4.56 the wheel turns slower but more roll per RPM. Leaving on a 2-step helps tons too, consistant, and you can work your way up systematicly.

the 26" tires have an inch less sidewall, and spin faster.

Also, Im not saying suspension setup isnt important. It has to be up to the task as well... Just that suspension isnt 100% of the 60'

02SOMWS6

iTrader: (6)

If you plan on never using nos then go with a 4.56
But if you ever plan on spraying you will run out of gear so you should run 4.30 gears with spray

bad6as

iTrader: (17)

for me i chose a 3.90 gear when i got my 9" because with a 26" i could do 130 in 4th at 6600rpms. and a cam w/ 150 shot should put me there. a 1.67 n/a with a 150 shot off the line what would that be a high 1.5?

BlackWS666

iTrader: (31)

i just put on a NX parahna direct port kit. Probably will be hitting next year with a good size shot. I may do a gear swap, but i still have to give it some more thought on the ratio.

THANKS FOR THE INPUT GUYS...I REALLY APPRECIATE IT.

02SOMWS6

iTrader: (6)

4.30's will work out the best for you with a 28" tire. You will run better than 4.10 NA and you won't run out of gear when you spray

BlackWS666

iTrader: (31)

Got the relocation brackets from UMI today. They are NICE. I will do a little street practice tonight, and see if it feels different.

3DFORMULA

iTrader: (4)

What exactly is a two step?
Thanks in advance, Darrell

P.S. Great M6 thread.

gold98Z28

iTrader: (7)

all this gear ratio talk is blown out of porportion if it is a dual purpose car that gets driven. sure if its a dedicated race car then you want the rpm's maxed when you go thru the traps if you have the traction to bring it out with that much gear. and those saying you need x gear with x tire are not getting the whole picture, its all dependant on your power level when it runs out of gear. with a 4.1 gear and 26" tire i run out of gear in the 1/4 on spray. and power shifing 5th is out of the question. i had to either take gear out or go with more tire, that or crank it past 7200 on a daily driver with nothing more than rod bolts. if he cant hook it on a 4.1 then no way in hell he is gonna hook on a 4.3 or 4.56......... this is about getting it to hook not what gear to run...........

BlackWS666

iTrader: (31)

Went to coles county dragway last night. After 6 passes of rehersal she finally started to pull good after setting the tire pressure at 11 PSI. Front shocks at 0. Rears at 4,5 or 5,5. Launching from 5000-6600. Doing a 10 second burnout. She pulled a best of 1.66 60ft. Im not to sure how much the LCA relco's worked, but I know that dropping the tire pressure to 10-12 was most of the problem.

Torkman15

iTrader: (2)

I'm sure that setting the fronts at 0 helped you (alot) to get the weight to transfer, also lower pressure is not always better on an ET Street tire. If your running a stiff drag then its OK (lower pressure) with a stick. Rear drag bar dont start helping till your running into the 9s.

good luck, Tom

ndfrsd6

iTrader: (5)

there u go it all in the setup u need to play with it a little tire pres,ect.... you can prob get into th 1.5's with a 2-step finding the right rpm helps .....i run my fronts at 2 and that seems to be good for my car ....every car is a little diff. just find whats good for your setup and practice