Boost and restriction help!!

[96PonyGT]

Hey all. I have a vortech 2 trim and a 3.33" pulley and power pipe going through a big 32x12x3 FMIC and I only see 6.5psi of boost. Does that seem low to anyone? And also I used the stock vortech discharge tube to feed into the TB even with the FMIC I just cut the one end off would it make a big difference seeing as that it would be 3" piping all the way until then where it goes down to 2/5" or whatever the discharge tube size is? Im just wondering if that is causing the restriction. Thanks

 

[blown98gt]

a 3.33 pulley really isn't that much plus when you are running through a FMIC also remember that boost is just a refrence of restriction the better air flow you have in reality the less boost you'll see.. I mean your FMIC seems a it large but if you want to see a little more boost then put a smaller pulley on. Also you can consider getting a boost pipe which will allow more air in will add a few pounds, but imo i don't think you have a problem with any of the piping. Vortechs seem to loose a bit of boost when a FMIC is added into the mix (from what i've seen) but with cooler air going in means more power. So just keep all that in mind.. hope this helps some

 

[96PonyGT]

Yeah I already have a AFM boost pipe and was just shooting some ideas around. I have seen people with the same setup run into the 9psi range.

 

[joelbegt]

FYI The max flow of the 3" thick intercooler seems to be closer to its flow limits with a vortech if its the ebay one. I'm planning to use the 4" thick ebay one when i finish my blower setup next spring. 2.5" piping reduction probably doesnt help much either.

 

[Cobracarlo]

Do you have headers or cams? What kind of power are you making? these are other factors we need to know.

 

[Lee12609]

really depends on what RPM you are taking it to.

my car with 3.33 pulley non intercooled would see 5-6psi at 5000rpm, 8-9psi at 6000rpm. the 2.95 pulley non intercooled was 10psi at 5000rpm and 13psi at 5700rpm. during all this my tachometer was off, 6700rpm on the tach was actually only 6000rpm, and 6000rpm on the tach was 4800rpm. stock shift points with an auto are around 4600-4800rpm, so i thought i had a low boost issue for the longest time, when actually it was the stock shift points.

comparing npi boost readings to pi boost readings is a waste of time, their heads and intakes flow much more and at the same RPM make less boost, but most of the tachs in the 99+ cars are slow, meaning people shifting at 6000rpm on the factory tach are actually turning slightly more rpm, thus higher boost.

you need a smaller intercooler, with a GT/v6 front bumper there isnt much open area to get good airflow, so anything much bigger than the opening in the bumper is just adding restriction instead of adding cooling.

also the AFM boost pipe at your low boost level isnt going to make much if any difference, once you get an OD crank or smaller blower pulley the power pipe will help. the convoluted vortech inlet pipe isnt restricted much until 8-10psi.