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Need some help. What p.s.i. Are you guys running in your drag radials? I am running 275/55/16 m&h racemasters, truck tips the scales at 4500, has 3:73 g80. I have been running them at 25lbs and the hook fine for 14.7 pass, but the 2 times i hit the n2o they just go up in smoke. I know these tires will hold for high 12 pass because i have seen them do it on my buddies old truck. But he has absolutely no recollection of the p.s.i. He was running.
Quote:
Originally Posted by will_oh
id just drop a couple PSI and see where the sweet spot may be !
ya those tires have held 8's
Idk about the M&H but my M/T's like 13lbs. I spin them at 18lbs.
I'm running exact tire at 22lbs on the street tho. And it's a huge diff from 25 travtion wise. Iv been down to 16 with success
never had luck with a DR that low on psi, alway liked them up around 18-22 psi. if i had spinning issues i made adjustments to suspension or launch techniqueQuote:
Originally Posted by AFSP1211
ive seen a 235 radial go low 9s.... just cause someone else has done something on a certain tire doesnt mean you can. so since the tire is capable and its still not happening that points towards the suspension. you cant always just bolt on some sticky tires and expect miracles to happen. it takes more than that
16-18psi
well these are actualy my friends tires that he ran the 12s on and we both have the same truck and rear suspension (2in shackels) differences i have 2in drop springs in the front. and his was a 5.3 turbo mine is 5.3 n2oQuote:
Originally Posted by sprayedenali
n20 hits differently then a turbo setup off the lineQuote:
Originally Posted by will_oh
still every vehicle is different, you cant compare his setup to yours
ok, here's how we set the PSI for our slicks so it may apply for you as well.
Set a base PSI of around 20
Find a relative clean, slick patch of concrete. i.e. we use our shop floor.
power brake to leave a good footprint and measure your contact patch until a good, even grip is achieved. Solid all the way across with no thin patches in the middle or sides.
Adjust your pressure up or down until the contact sweet spot is found.
Running a low psi just to get a wrinkle wall doesn't help if your tire isn't grabbing in the center.
Why waste your money on a drag radial when you can just get a full slick and there will be no excuses
You can't roll slicks on the street when it rains. It's hard enough with D/R when it rains.Quote:
Originally Posted by Ray@NP
sooo why wouldnt you have a nice set of street tires and nice set of slicks for the track?Quote:
Originally Posted by canada4g63
Ray, you'll have to forgive Justin, he's got a dinosaur brain. J/k Justin. I think we're all aware that slicks suck in the rainQuote:
Originally Posted by Ray@NP
Sometimes we can't afford both. But I do see what your saying. Slicks are a much better option.
i agree with you on that part about the price, but when i was going to buy some drag radials they were alot more than a set of full slicksQuote:
Originally Posted by canada4g63
Keep in mind drag radials won't last for shit if you leave them on for daily driving. My tool of a neighbor in college had some on his TA and couldn't figure out why they wouldn't last very long. :lol:
Mine are ran daily...
my 555r's made it 12,000 miles. not bad IMO. my current build will be a drag radial truck. it will be nice to drive to the drag strip, tech in and drive directly to the staging lanes without ever getting out of the truck. also no need to worry about your nice wheels/tires and jack laying in the pits while you're out making passes.Quote:
Originally Posted by BigMac
Yea I wasted my mh drags took like 8000 miles
No one cares what I think but I'd start at 20 and see what the 60' is compared to the 25 you were running. If it's better, go to 18 and see. If worse or the same, go to 22. I wouldn't want to run much less than 16 or so at that weight. DR's don't squirrel near as much as slicks but....
thanks guys for all the input. O should be hitting the track the 13th, so I'll play with the pressure and see what happens.well the only reason im even running the drs is because they were given to me. But since don't daily them, when the time comes for a new set I'll be be going to a d.o.t. Cheater slick.Quote:
Originally Posted by Ray@NP