When comparing different sizes of the same tire, and why one guy's 265's outhooked another guy's 315's, keep in mind the age of the tire.
I run M/T drag radials, which hook outstanding all the way down to 30-40 deg when new. But now that the tires are 5 years old, I spin all the time, and the tires feel hard. So over time I estimate I lost a good 30% of the traction the tire had when new.
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Make sure your alignment tech sees both adjustable bolts in the front LCA's - a lot of folks have trouble getting to Lance spec and usually that's because the alignment tech is only adjusting the rear bolts on the front LCA's.
If you're persistently having wheelspin issues under power even after the Lance alignment, minimize the negative camber settings on the rear. As I explained earlier, lowering the MKIV leads to aggressive negative camber values under weight transfer/acceleration, which in turn rolls the tires off of their contact patches.
A lot of the sudden improvements in straightline traction by going to E/T streets etc is all because of the additional sidewall flex that allows the tire to keep a good contact patch even with the negative camber. A lot of old school drag records were set with stock ride height in the rear or even a little higher than stock which didn't just help clear 28in drag tires, but also mitigated the excessive negative camber issue.
there are many variables at work, but just to give you a data point, when I was running 315/30 r888's at ~1000 whp through a 6-spd and 7275, I'd get spin through first, second and top of third, none in 4th. car was lowered about an inch on Penske coilovers and rear camber is 0.
I run 305/35/18 R888R in 94 single turbo w/T56 6speed MKIV making 820whp. Car hooks second on the street. Prior to R888R I was testing MT ET STreet 305/35/18 for three weeks and they would spin second if I did not heat them up first.
Before testing MT ET I was on 275/35/19 Nitto NT05 on a good day I could hook third. I’m in sound Texas and our roads are made of asphalt.
I don’t do much from a dig in the car that’s why my comments are regarding Second gear.
I don’t have traction control hooked up and I don’t have boost my gear or speed.