Drag Racing Tech - drag slick size question......

Alright, here are the mods to the car:
98 Z28 A4 car
raceweight of 3400lbs
skinnies/slicks on welds

air lid, whisper ram air kit, hooker lt's, off road y-pipe, hooker catback, vig3200 converter.

my best so far is a 12.31 @ 110mph on a 1.68 60ft.

now for the question. I seem to have hit my limit on the 60ft. i am dead hooking to all my 60fts. the lowest i was getting was the 1.681 two runs in a row. the other 9 runs that night were all 1.71x. I was running 26x10 e.t. drags. gears are the stock 3.23's. Is it possible for me to be running too much tire for such a small bolt on effort? Would i benefit 60ft wise, e.t. wise, or mph wise by going smaller to a 26x8.5 ET Drag or 26x9 hoosier tire? I need a new set of slicks and rims, so I want what is going to be best for now. Thanks!

Chris

<small>[ September 08, 2002, 06:53 PM: Message edited by: z28kid98 ]</small>

Chris,

I think that you need to go with a 28x9x15 slick or a 28x10x15 with a 4.10 gear. <img border="0" alt="[devil]" title="" src="graemlins/gr_devil.gif" />

To answer your other questions, #1 question No, #2 question yes, maybe to the 26x9x15 slick. I personally like the Goodyears or the M/T slicks. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

This is just my 2 cents but what do I know? <img border="0" title="" alt="[Razz]" src="gr_tounge.gif" />

10.5" et street kido.

high 1.5/low 1.6 60's with that tire and same gear/converter combo:)

just wait till it gets cold out <img border="0" alt="[devil]" title="" src="graemlins/gr_devil.gif" />

I suggest you keep the 3.23's in the car for as long as possible. You will be hard pressed to have aftermarket gears as quiet as the factory 3.23's, and that gear is fine for a bolt-on A4 car.

On to the tire question. I ran 26X8.5 15 MT Et drag's with my tp4400 3.42 3350raceweight bolt on car and ran consistent mid 1.5's.
**Yes, I do think a 26X10 is too much tire for your car. **Yes I do think a 26X8.5 would et better and run more mph. The tire is lighter and doesnt grow as much as a 26X10, and this in itself is why its better for your application. Realize your a4 doesnt hit the tires like an m6 in the least.

Also, do you run an airbag in the right rear shock? If not you should, and if so what psi?

Also, have you stalled the car differently to see what effect it has? When doing so make sure you dont heat up the convertor more than necessary by sitting at the lights with the car stalled up waiting. This will definatley affect 60 foot and tranny life.

well, i have planned to do a 4.10/TP4400/28" tire combo, but that's over winter. i don't mind gear whine, hell i probably won't even hear it over the duals dumped under the car with lightweight carpet <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

i have played with stall points a lot. i found that launching right off idle equaled no wheel spin, and a 1.71x 60ft. by gradually increasing the stall to 2400rpm and launching at that gave me the two 1.681 60ft's. that's as good as i have done.

i used to run 16" 26x10.5 e.t. streets, and the best i could do was 1.71 on that tire too, but that was only with the air lid, converter, and exhaust, no headers, ram air kit, weight reduction.

Mike, i do not have an air bag, but i guess i should look into it. the car does squat hard on the right rear(no sway bar and a torque strap keeping the y-pipe from hitting floorboard). Thanks for the advice. Any other thoughts?

Chris

ps- i don't start stalling it up till the other person lights the stage light. so i don't think i'm heating it up TOO much.

<small>[ September 09, 2002, 04:12 PM: Message edited by: z28kid98 ]</small>

Woah! You arent running a rear swaybar, or do you mean front swaybar? I hope you mean no front...

Nonetheless, I think you should get an airbag. I'm not saying this is going to drop you into the 1.5's, but its needed in the grand scheme of things. I think billingsly racing, who used to be a sponsor here?, sells the airbags individually. Summit and the like sell them by the pair. You should start at 15 pounds and work your way up. I think with a raceweight of yours 15 psi would be a good startign point. You want to try to get the car to leave as flat as reasonably possible so get someone to watch that knows what they are looking for.

HAHAHA, of course i meant no front swaybar <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> i'm looking at a anti roll bar from BMR or Billingley too, but i think that may be a bit overboard at this point in time. So look into an air bag. thanks!!! hopefully with the more weight reduction i'm doing it'll help along with the right size tire and the air bag, i'll get down a little bit more. thanks

Chris

TTT, any thoughts?