D1-sc with 4" pulley and 7.65 crank, how much boost
#5
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A 4" would be playing with fire definatly. Its allmost not worth it anymore to get max hp out of a stock piston motor. Parts will break at the added stress, regardless if the tune-up is good. I remember seeing one member on here explode the engine + trans in a video, not pretty and had the possibility of harming the driver (oil down).
If it was my car, i would fly with the 4.25. While i was doing so, i would be building a new engine so if that one goes i have something to look forward to.
If it was my car, i would fly with the 4.25. While i was doing so, i would be building a new engine so if that one goes i have something to look forward to.
#6
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I have a realy rich tune, i was at 11.2 A/F with the 4.25 pulley a 9-10 psi
And 11.0 on methanol, just spraying a little meth, my timming is back to about 18-20 degs,
I figered the 4.0 pulley would lean me out a little on gas and then i can put more methanol into the A/F
And 11.0 on methanol, just spraying a little meth, my timming is back to about 18-20 degs,
I figered the 4.0 pulley would lean me out a little on gas and then i can put more methanol into the A/F
#7
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while the tune is important its not the issue here, its the power and stress on stock components that is the problem, you could be at 9.5/1 AFR and you will still break stuff quick if your pushing 500 rwhp or more enjoy what you have at a safe level till your ready to do a forged motor, dont blow yours up and have the car down for months
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#9
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while the tune is important its not the issue here, its the power and stress on stock components that is the problem, you could be at 9.5/1 AFR and you will still break stuff quick if your pushing 500 rwhp or more enjoy what you have at a safe level till your ready to do a forged motor, dont blow yours up and have the car down for months