boost controller ?

Hello,

does anyone know if you can effectively install and use a boost controller on the 3800 sc? I know how it works with turbo but not with supercharge.... anyone??

ummm i like to control mine through a Modular pulley system.........
www.smoothflowpulleys.com just get a 3.6 inch and you'll up your boost and go FAST..........

Yep, that's pretty much the answer. I like the Pulley Boys MPS myself. Many like the ones from Intense Racing or ZZPerformance.

so getting a smaller pulley is more effective at upping the boost or is that just the only way to up it? basically, what if i did have my pulley smaller and still wanted to up boost a couple pounds or so.. would it be possible to install a boost controller or ?....

Since a blower is mechanically driven by a belt, swapping pulleys effectively replaces the function of a boost controller. Pulleys are very precise, too. You gain about 1 PSI for every .1" drop in pulley diameter. Stock is 3.8", so going to 3.6" you would gain about 2 PSI all other things being the same. So there is no boost controller for a supercharged engine because swapping pulleys is easier, cheaper, and does basically the same thing.

See this thread for more info: https://rivperformance.editboard.com/series-ii-engine-transmission-f4/smaller-sc-pulley-t3656.htm

The only thing a boost controller might be able to do is manipulate the BBV which is already allowing maximum boost mechanically possible at WOT. Only thing you can really do is modify the BBV to close sooner as throttle is applied to make boost a tiny bit faster. The improvement is barely noticable and won't really make it any faster. If anything it will hurt fuel economy. I have even braced the valve closed so it is already in boost status at all times and I noticed a little bit snappier throttle responce but no more boost or power, plus that's obviously not supposed to remain closed all the time. Don't even bother trying it.

thanks all for the input - i guess smaller pulley... but smallest i wanted to go was 3.4... which would put me at what - 10 pounds of boost? (if im correct in saying stock is 6psi) so 15 would be un -do-able? would i have to get a computer program to make it higher?

96rivgirlla wrote:

thanks all for the input - i guess smaller pulley... but smallest i wanted to go was 3.4... which would put me at what - 10 pounds of boost? (if im correct in saying stock is 6psi) so 15 would be un -do-able? would i have to get a computer program to make it higher?

these blowers run most efficiently at about 13-15lbs of boost max.
the more boost you have though, the more knock you have - which is bad. Knock blows up motors if you didn't know.

you need to modify your engine to run a smaller pulley. Smaller pully's bring in more air, but you need to open up your exhaust to get that air out and run rockers or a cam so the motor can process that air better. you also need to tune in more fuel to burn with that extra air and even get bigger fuel injectors. as you do these things you actually lose boost - which isn't a bad thing. The more boost your car runs, the more restriction is there causing it.

for reference, I get about 10psi running a 3.25" pulley. but my exhaust is opened up, my blower is ported allowing less restriction and Ive got rockers allowing the valves in the heads to move more air.

Do NOT put a 3.4 pulley on an otherwise unmodified engine. You are asking for trouble. Start with a 3.5 and an MPS with a lot of pulley options.