Max boost launch on MT DR 275/60/15 ?

Drewster

Wish I Had A Clone. AKA Andrew Youlio
Joined
May 31, 2001
Can any one do high boost launches on MT DRs? Whats the secret?
I can make 12psi boost on the foot brake but the MT DRs 275/60/15 cant hold it and get blown away. They seem to stick at about 7-8 psi launch max.
18-20 psi in tire gets same result.
Am I asking too much of a DR?
Times and other info is in my Signature
 
What kind of PSI you running? Have you tried adjusting that? How was the track prep? Was it a TNT where everyone was blowing there tires off, or were others making good short times?
 
It was a TnT during a Bracket race event. Lots of cars with slicks. Both me and another TR driver with MT DRs was only able to launch with 7-8psi boost. But that’s was about it. Similar for other nights.
He runs mid 6s, and I high 6s in the 1/8.
The slick cars had no problem.


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no matter how I asked, wouldn't stick much over 5psi. Will try MT Pros next round
 
I would remove the air bags with the HR bar.
 
This video is somewhat helpful if you want to learn what a drag radial setup needs to perform.
 
I tried with no air bag pressure but had some rubbing on a hard hit, so running 5psi at the moment
 
255 shouldn't rub anywhere with the right wheel offset. I had them on stock t rims with plenty of room.
 
I have had great experience with the instant center adjustment from H&R. On a well prepped track and 255's, the car launched 10-12 psi, no spinning.
Should be better now that the exhaust leaks are fixed and the converter is right.

 
Monroe shocks are not what I'd use to dial in the suspension.
I'd look at a double adjustable shock for all 4 corners.
 
Local guy to me does 1.4x on MT 275/60 off trans brake at 10-12# He has the weld on rear bar and pulls both front tires about knee high I thing he has 90/10 and 50/50 shocks. I can do mid 1.6 on 255's launching @2800@0# with ATR rear bar and IROC front bar and stock shocks.
 
My test car runs high 1.4’s on the street with 120lbs of ballast with the 275 pro. If you can’t get this tire to work on a prepped surface something is seriously wrong. Rpm and ramp are what matters. It will usually take most of it by 1.2 seconds on the street. Launch usually 3-4psi. Rpm 3600-3700ish.


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If any of you watch Street Outlaws, I would like to encourage some thoughts;

-Same size tires (10.5' tires)
-Often lighter cars that what we have
-Much more power overall (1800-3200 peak?)
-Still hooking hard on a unprepped surface with 2 water burn-outs
-Let's ask ourselves how?

So, IMHO;
-It's likely not the tire size that is the problem
-Nor the power we are trying to put down
-But the combination of everything.
 
If any of you watch Street Outlaws, I would like to encourage some thoughts;

-Same size tires (10.5' tires)
-Often lighter cars that what we have
-Much more power overall (1800-3200 peak?)
-Still hooking hard on a unprepped surface with 2 water burn-outs
-Let's ask ourselves how?

So, IMHO;
-It's likely not the tire size that is the problem
-Nor the power we are trying to put down
-But the combination of everything.

Those cars are scaled way back in power and the cars are ballasted. Most have big tires too. Small tire is a death sentence for that kind of racing.


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Those cars are scaled way back in power and the cars are ballasted. Most have big tires too. Small tire is a death sentence for that kind of racing.


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Agree.
On last night's episode, there were running on small tires (10.5×29) and still hooking enough to pull the front wheels though. So they are likely launching with decent power. Weight placement makes a big difference, but JJ also briefly mentioned Instant center on one episode. Those guys have it down to a science!
 
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