Pullies / Boost?

[92lxstang]

I am buying an S Trim in a few weeks. My question is what pulley combo will make near 8lbs. of boost. In the future I will up it to around 12 or so, but I ran out of money to upgrade my fuel system. I am going to be running 24lb injectors and FMU for the time being with around 8lbs of boost. The pullies that are coming with this kit are 3.33, 3.15, and a 2.97 or 3.00 with an 8" crank pulley. The 7" crank pulley is damaged and can't be used. Is there any combo with the 8" crank I can use to make near 8lbs? Any help is appreciated!!

Thanks,
Ryan

[bumblebee03]

The 3.33 should give you 8lbs, 3.00 10lbs and the 2.97?,, about 12,,, boost levels differ and it depends on engine efficiency and altitude... Lee

[86merc]

I doubt that any combo with a 8" lower pulley will make under 10-12#.

For exapmle I had a 6.87" lower with a 2.95" blower pulley and saw 13.5# @ 6000rpm. I just switched to a 8" lower with a 3.33" upper to reduce belt slippage. The impeller speed with the 8/3.33 is 2000+ rpm higher than the 6.87/2.95 combo. Even with a 6.87" pulley you will need to run a 3.33" maybe the 3.15".

I can hook you up with a deal my old 6.87" crank pulley if you want.

[midnight]

U should make way more than 8 w/ the largest pulley(3.33)@6k rpm & 8" crank pulley.The SC w/b turning 49729Rpm's also.Vortech says the max efficiency is 45k & absolute impellar speed of 50K....Soooo you'll b at the ragged edge...

[92lxstang]

If I get a 6.87" Crank what blower pulley would I use to make around 8lbs, the 3.33?

[86merc]

Depending on your combo and a few other things, yes.