why is my boost/response so weak?
I have a n2k kit for the 96-00 GM 5.7 on my denali. The blower oil seals were bad so I rebuilt it and everything is fine again. But the response with this thing is horrible...worse than any LARGE turbo I've ever dealt with. Here's some info about my setup.
8" crank pulley
3.75" blower pulley
10 rib (it is not slipping that I can tell)
no boost leaks (I pressurized the intake using shop air and a silicone coupler to be sure)
MSD 6a, msd coil, msd 8.5mm wires, msd BTM
2 additional injectors and HKS AIC to control them
plx wideband o2/display
At 3/4 throttle to WOT,
I see 1.5-2 psi at 2000rpm
I see 2.5-3 psi at 3000rpm
I see 5-6 psi at 4000rpm
I see 6-8psi at 4500-5000rpm which is the shift point
Even if I drop down to a 2.75 pulley, my impellor speed at 3500rpm will be about the same as it is now at 4500rpm, which means my boost probably wont be any more than 7-8psi then. I'd like to be seeing at least 5 by 2000rpm and 10 or so from 3000 up.
Granted, I dont have my fuel and AFR worked out fully yet (every time I dump in fuel with the AIC, the stock computer pulls fuel out of it's main injectors and leans it back out), but to my understanding a blower's ability to produce boost shouldnt have anything to do with that.
If the damn thing won't do any more than this, I'm not keeping it...it's not drastically faster with the blower than it was bone stock, maybe a couple of tenths in the 1/4.