First time drag racing
#1
First time drag racing
Well, this weekend will be the first time taking my fully built turboed em1 to the track. I am making 430whp and am running 225/50/15 mickey Thompson Et Street R's. What should I put the tire pressure to? Also, I have launch control and right now I have it set too 6k rpms building 10lbs of boost off the line. Is that too high?
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Re: First time drag racing
Id say you will find a happy point with the tire pressure somewhere around 10 psi cold. A good burnout will get them ready to go. dont forget to preload. after you light the first staging light, with the ebrake on kinda drag yourself up by working the catch point on the clutch until you light the second bulb. 6000rpm and 10 psi arent bad starting points, but really you will have to go through trial and error making adjustments. I guess with the launch rpm and boost start off with it spinning and keep dropping it down till you are just barely hooking up. we all know spinning aint winning, but its also not breaking **** as you would from dead hooking with no preload. good luck and have fun
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Re: First time drag racing
I'd start high on the tire pressure (~14psi) and see what the track looks like when you get there.
You want the highest tire pressure you can run with the lowest 60ft. If you keep dropping pressure past that point, the 60ft will stay the same and the ET/MPH will start dropping as the tires end up sucking up friction.
See what it does at 14, then drop them to 12, then drop them to 10 if you picked up a fair amount on the 60ft from 14 to 12.
If the track is garbage, you may even get the best 60ft as low as 8psi.
Don't forget to bring an air pump or make sure the track has one if you dropped pressure and you didn't gain anything
You want the highest tire pressure you can run with the lowest 60ft. If you keep dropping pressure past that point, the 60ft will stay the same and the ET/MPH will start dropping as the tires end up sucking up friction.
See what it does at 14, then drop them to 12, then drop them to 10 if you picked up a fair amount on the 60ft from 14 to 12.
If the track is garbage, you may even get the best 60ft as low as 8psi.
Don't forget to bring an air pump or make sure the track has one if you dropped pressure and you didn't gain anything
#6
Re: First time drag racing
I would also run higher pressures. You're running drag radials which like a higher tire pressure than a slick does.
I'd start around 16psi or so and drop from there.
I'd start around 16psi or so and drop from there.
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Re: First time drag racing
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Re: First time drag racing
But the main thing is, you will not get the best times you can on drag radials, your car will shine and do what it should with slicks. And I don't know if you're concerned that 430whp is too low for slicks or stock axles are to weak for slicks, I could be wrong but it seems that way based off the above quote, but I was using slicks back when I was only making 270whp. And when I got to 400hp I still ran slicks and ran pretty decent times. And if the concern is the stock axles, preload. Preloading is everything. I got my best time and 60' this year with a really good preload. and it reduces shock loads to save parts. Doesn't matter if you're on stock axles or upgraded axles, preloading is extremely important.
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Re: First time drag racing
While i cannot deny that slicks are the way to go, radials are not a definite death sentence for ur drive train. I have hundreds of radial passes over the years and never broke a axle. Pre load and start a bit higher rpm were important factors in that. Either way its racing and all kinds of **** can happen. What kind of differential was that? Once u get the new axles u will be ready to rock and roll again!
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Re: First time drag racing
While i cannot deny that slicks are the way to go, radials are not a definite death sentence for ur drive train. I have hundreds of radial passes over the years and never broke a axle. Pre load and start a bit higher rpm were important factors in that. Either way its racing and all kinds of **** can happen. What kind of differential was that? Once u get the new axles u will be ready to rock and roll again!
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Re: First time drag racing
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