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Yeah your car is fairly light so maybe you are making slightly less than 350. Spinning is gonna drop your trap speeds cause you aren't going as fast as if you hooked. My car does not accelerate when boost comes in during 1st gear. Sounds like you might be pushing some coolant from the HG letting go. What did you torque your ARPs to? Hopefully you can get it squared away and make some solid power and trap some mid 120s on pump, I think you can on that setup. Keep us updated on your progress.
I trap nearly the same on street tires and slicks. Spinning for the most part only hurts ET. I know this from years of experience (same with 8 valve prick). We're not pulling this out of our ass here.
Spoolin-thanks for the plug.
As far as your traps, yes, they seem a tid low, a few things for you to check-
Have you ever had to car on a dyno, or do you have a way to check AFR's on the street? If not, do so and get the fuel right. If you dont, pick up an AFC so you can tune the pig.
With the amount of air you are flowing (and such little boost) you will be fine bumping the timming up some. Try 8deg adv. Keep eye on the knock.
@18psi, your probably in the low-mid 300's. The 35r wheel comes aliv3@21-22psi+, so expect to crank it up a bit. I woudl want to see 20psi at the least if I were you.
Dont get discouraged-your set up is prime to make oyu a ledgend ont he Highway. The BFG's will hook better as they mature. cam2 (110)Race gas and 28psi will make an oddly easy and reliable 5xx whp for you, especially if you take it to 8k. (turn the timing back to 5 for this though
) This should net you near 130mph traps or more. Done be afraid to turn it up!
You have a secret mod waiting for you in your PM inbox also:)