Hey, as most of u may know iv been going to the track alot and improving. I went to the track yesterday again to try and do a better burn out. Well the burn outs did improve alot, i actually sprayed it a bit not only to help me spin but to purge the line, i shut nitrous off and stayed close to redline spinning, had my best burn outs so far. Then went to the light, took off, and just couldnt hook, best 60' was only 2.2. (8.8 at 80mph) Previous best at same track with 30shot was (8.6at 82mph 2.1 60')

Now the only different thing I did this time to the car was, I have a 50shot (had 30shot or less previously). thats about it.

Can anyone give me advice. Can my slicks be too small for the power im launching with, 22x8x15. Is the pressure too high? i had it at 16psi.

The 50shot helps the boost to come in almost instantly , So i get full boost in 1st gear, I noticed i was hitting the limiter in the 1-2 shift, that only happens when I spin. So mostlikely i was spinning a bit all 1st gear. Should i get taller slicks? should i lower pressure?

 

Good - it sounds like you've got it about right at the launch. You get boost right away, spinning the slicks through first and into second gear. You didn't mention, but how was the second 1/8 mile? Trap speed and such? Or was this a 1/8 mile track? And were you spinning BOTH slicks with your open differential? Was anybody checking?

You are definitely ready for wider slicks - lowering pressure on the ones you've got now wouldn't help a bit. The M&H 23/8.5/15 ripple-wall slicks on 8" rims come to mind - since I ran them last year, and of course a VLSD auto tranny to pull the load. You could also put a hi-stall Edge TC in there.

Betcha you have noticed by now just how much work and attention to detail is needed to shave even 1/10 sec off your ET. And racing at the track is much more complicated than kiddy street racing.......


Or you could go bigger:
12" Hoosier slicks on M T ET Drag 10" wheels - 32 lb combined.


2mm off the (shiny) caliper brace and these wheels/tires bolt right up. M/T ET Drags, -42mm offset, 4 1/2 inch backspace, 13 lbs and $104 each. Heh.
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Front suspension raised up 1 1/2 inches - a test...
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Great way to change tires: #1 portable impact wrench.
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Some of my family issues: Wife and three of 5 grandkids.
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I was able to hook with 195wtq on 20in slicks, I figured you should be able to hook on 22s. I found that setting the tires between 10-12psi worked the best for launches. FYI I pulled a 1.89 60' on a 50 shot in my se-r at the track. My timeslip looked just like this below and my race weight was 2740lbs, it put down 185whp/195wtq on a dynapack (137whp/126wtq NA). Also consider other suspension modifications to maximize your launch, adjustable struts, spring blockers in rear, poly motor mounts, traction bars will all help you cut a better 60'. Besides with an automatic you want the most gear multiplication you can get, so its either smaller tires or swap final gear's with a SR20 tranny (its a 4.18 final).
1.890
5.574
8.635 @ 80.78
11.317
13.576 @ 99.58

Looking at your 1/8 ET and trap if your car hooked as well as mine did, you would run 8.3-8.4s which would have you at low 13s.

 

I say you need bigger slicks. I am thinking 24.5" slicks.

 

I have run a 1.7 60' and 12.1 on 22" slicks spraying a 150 shot out of the hole so as soon as you hit that milestone I would consider upping the size. I ran approx 12 psi in the M/T's and they would sqawk coming out of the hole but thats all.

Could be a lousy track surface too, go to a race, if its only T&T the track preparation is virtually non-existent at most tracks.

There is something wrong if you are only running 2.2's.

I now run M&H 23.5's and I can't spin them with 20 psi N/A but then thats only about 250 HP or so to the wheels.

 

I'd drop the pressure in the tires before you go spending money on new tires. 16psi is too much in my experience. I usually ended up running around 11-11.5psi.

 

Thanx alot guys. It seems that 11-12 psi works for all of you. I will be trying that next track visit. This time we are going to the 1/4 mile, this 1/8th track SUCKS!

harol, as for the higher stall. For now I am going to stick with the 50shot and stock stall. As soon as light turns green, that thing sprays and boost comes in very quick, so i dont have problem putting power down at the launch.

I wonder how much power its making with 5psi+50shot lol (well i dynoed 230at5psi, so 280 whp off the line then suddenly 10psi, hmmmmmmm. I cant wait for that to actually hook!!! (12's? )..

 

I ram mardi's 26X10's and toasted my clutch. hahaha. yes, they gripped awesome. but I could benefit from something a lot smaller. Now they are owned by jcy98maxse once he gets that mad 3.5 turbo running he will need them.

 

Jime, how wide were the 22's that you used back in the 150shot days? was it same as mine 22x8x15?

 

Yes they were. I still have 2 sets, one is just about shot and I use them to test on the road, my testing spot is only about a 1/2 mile away so I drive there with them on and do my thing. I will tell you though, they are not much better than street tires on the road, the strip has tons more traction than bare pavement.

They aren't quite as good as the M&H's I have now but they still work very well with a properly prepped surface. I also have the M/T's on millenia rims and 6" isn't wide enough for them you need 7's minimum or 8's for best performance. They look like a balloon on the milenia rims.

 

well I think since a factory size tire for a 15 inch rim on a maxima is 25.3 inches tall a 24.5x8x15 or 26x8x15 would be the best tires to go with.

 

That looks mean as hell,

 

For my car, 12 psi was too low. The M&Hs would wrap around the rim ! and the car would bulldog at launch and shake in the traps. 16 psi worked a lot better - best 60's (1.9s) and 104-105 MPH traps were with 16-18 psi.. more stable. And this was on several prepped tracks....

IMHO, you need the short slicks - you are automatic - and the wider, the better. Remember, without a VLSD, you can easily spin just one slick. Wider tires will help with that. They won't hurt. I would like to see your launch with your 5psi+50-shot - with updated slicks, that car will be a rocket! My bet is that with a great hook, 1.9xx 60', 8.3/8.4 1/8 mile, and a tailwind, a 13.3 or 13.4 is gonna happen right away.



Then you can learn how to punch into the 12's....

 

M&H's are a total different animal than the M/T's. The M&H's are a true wrinkle wall and like you say 12 psi is too low for them. I still get traction at 20 psi so thats where I leave them.

However the M/T's need to run a lower pressure to hookup and 12 psi seems to be just about right. I went through 8 sets of M/T's usually 2 or 3 sets a year. The only reason I got the M&H's was because the M/T's weren't available at the time. The only real advantage I can see that the M/T's have is that they don't require heating up as much to get them to stick.

 

good info. Since I already have the 22" m/t, ill dro them to 12 and try again. Thanx.

Jime, question. I forgot but did you ever reach 12's with your nitrous 4th gen? if so, what was your 1/8th and 60'?

 

Oh ya, actually I ran the same time with a 150 shot on the 4th Gen as I did with a 100 shot on the 5th Gen. These are the 3 best times on my 4th Gen. A 50 shot would put me in the 12's with the 4th Gen.

14.6 N/A
13.1 35 shot
12.1 150 shot

 

Yeah, I agree. The Millenia wheels are dang light, but at 15x6, they aren't really wide enough for the 22x8x15 MT slicks.

I have these slicks mounted on Millenia wheels and they work just fine for me since I only do 1.9s with high tire pressure. But, if I ever decide to get more serious, I'd have to run a wider rim to maximize the potential of the slicks.

Streetzlegend, the slicks aren't the problem. You are just still learning your car. You should be seeing 1.8s very soon with decent weather and track conditions.

 

Now i dont know if to try again at this 1/8th track with lower pressure. or wait and go to the real track (moroso)... hmmm. ya'll have given me hope! =).
and ur right Aaron, im still learning. thanx to u guys iv learned alot. i just gotta put it to use. I am improving my burn outs, now i just gotta lower the pressure and try it again.

 

im in with you. Im jus gonna try it with 12-13psi next time just to get that 60' down som more. Then do the same thing for Moroso but with weight savings. Lets do this!

 

lets!!! btw, all this advice im getting also applies to you since you also have MT slicks.

 

I kno, lol Im gettin the same advice on my thread FTW. Lets go to Moroso and break some axles already!

 

Turbos like load. Go with the tallest tire you can (stock +1). The patch will be elongated so it will give you grip farther out more than a shorter tire as it turns. Go by the rim charts for the tire you choose. Too narrow a rim cause the tire to bow, loosing traction. I dropped .3 second just by going from a 26 to a 28 on my Buick.

 

Well I might try my friends slicks (95blkmax) and see how it goes, now its just a matter of trial and error. thanx for the help. btw nice buick

 

Just a comment here - our 4th-gen automatics need a lower gear, hence the short slicks work better. Picking a wider slick gives you the larger contact patch you need to hook.

And yes, use the right size rim for the slicks you pick. People insist on using narrow rims for wide tires, and lose a lot of contact patch by doing so. Lots of variables here.

 

While more load is always better for quicker spooling of the turbo - that is not his issue. there are other considerations - one is the crappy stock automatic gearing makes it hard for him to get out of the hole. The next is the fact that he has nitrous to spool the turbo so spool time is basically a non-issue for him. He'd be unwise to go with too tall of a slick. 26" would definately be too tall for his application and would slow his application down.

 

Turbos don't need a massive launch, they can come on strong at mid track, hence the load is not for launch but once your going. My car proves that. There are countless 10.5 drag radial cars that sub 9 seconds-wide is not only answer. A longer patch works better over a wider patch as you launch.

 

Those wheels have been around the world....I bought them from Tony Littel, and then used them a few times before I sold them to Mardi...

 

where do you guys find these small tires? ive been looking around for some good drag tires to throw on my 16's and i cant seem to find anything smaller than 26" tires

 

Summit Racing or Jeg's..... both have great web sites...

 

You aren't going to find any in 16" slicks.... there is only one 16" slick in existence that I know of that would actually fit in a maxima wheel well and it's a 26" Hoosier. You have to get 15s.

 

Have you looked on all of the MFG's websites?

 

yeah ive checked, i guess im having to go with a 26 X 10...wish i could go shorter though. i guess its better than running 2.4xx 60's all day. i cant run 15's cause im 5.5 gen and i dont have the bills to spend on kosei's.

 

you get 2.4's? thats not good man. you should be able to get 2.2's 2.1's on street tires.

 

wheel hop or traction a problem almost no matter what. i know i can do better on streets, but since i was already planning to get DRs or slicks, why deal with it??

 

streetz any 1/4 passes with nitrous yet

 

Nah man i wish, not yet. My goal is to break 12's with the nitrous. So far best 1/8th has been 8.6 at 82mph and i think 2.1 60'. when i ran 13.8 at 105, i had a 9.5 1/8th, so i estimate that my best 1/4 is probably according to the 8.6 i ran is 13.2-13.3.