So I have installed sos stage 2 aftercooled kit with paxton 1200 blower ang I'm getting like only ~8psi near the redline, thought I could get something like 10-11psi (according to sos table), sea level is approx 13 ft, IAT at wot (stock heat exchanger) is like 100-130, doubt I have belt slippage or leak around blower and aftercooler and I'm wondering can boost level somehow depends on timing/fuel? When we started etune with Evans Tuning I hit 9psi but it was pretty cold day, now it's only 8psi max, I even considering put 3.4 pulley to get some midrange juice (it's only 3-4 psi right now there)..any input will be greatly appreciated!

 

You have an 06? Do you already have injectors and flashpro? If so, get a smaller pulley.

If not, get those and get a smaller pulley. Evans will hook you up.

 

SOS changed the table recently... You'll be much happier with a smaller pulley. I am.

 

Argh!! that explains my problems! i had what I thought was a ~12psi pulley(old chart) but making only 9.2 psi. i was racking my brain trying to tighten the belt and looking for boost leaks(which I found no problems with either). So it turns out that I only had a 10psi pulley. Sucks if I hafta fork out for a smaller pulley and another tune if I want to get to what I originally desired.

 

you must have a 4.2" pulley (AP2)

 

I have an 07 novi 1200 4.0" pulley. According to the new chart, it shows as a 10psi pulley. The old chart showed it as a 11.5psi pulley.

 

you should hit 9-10 with a 4.0" pulley

I have a 08 and i hit 8-9 with my 4.2" pulley

 

dont worry the chart is still off. my 1200 blower makes 18-19 on the 3.0" pulley and so did ILoveMyHonda1984

 

you should hit 9-10 with a 4.0" pulley

I have a 08 and i hit 8-9 with my 4.2" pulley
[/quote]

ya, I hit 9.2psi, was hoping for 11-12 when i first dyno'd it. Now I know why i didn't get there

 

Yeah SOS chart is wacked. Their old NV 1000 chart is even off now. It use to be spot on.