have to jump in here... exaust restriction should have no effect on supercharger boost... less intake restriction will lower the boost pressure because more is getting into the cylinder but exaust restriction should have no effect what so ever, see what i am talking about?
Actually think about this. The intake air comes into the engine. Then it flows through the engine and exits out the exhaust. If the exhaust doesn't flow well enough, then it will backup into the engine, and into the intake manifold, and your boost will be higher. Usually installing headers will drop boost a couple lbs.
So Will, does that mean that when you open up your exhaust you can go to a smaller supercharger pulley to bring the boost back up to where it was before the exhaust pressure reduction, and not require adding an intercooler to cool down the charge.
OK, actually this does work. When a blower compresses air it heats it up because it is cramming it into an area at a certain amount of pressure. The more pressure it has to make the hotter the air will be. So, if the flow is better, there will be less pressure, meaning there will be less heat, and you can run a smaller pulley. That is why if someone puts a cam in their L67 they can run a smaller pulley because the flow is better. The same with headers. My moms SSEi was getting Knock Retard, so we installed rockers on it so it would flow better so the Knock Retard would go down. But really without very significant mods you can't go less than a 3.25" pulley, and you need some decent mods to be able to run a 3.25. Without a way to scan for KR, you want to stay with a 3.4 because you don't want to be blowing up any engines because you ran too small of a pulley.
1990 Maroon Grand Prix STE McLaren 3.1 Intercooled Turbo, 14.695 @ 94.49 on 12psi before cam/heads/etc.
1990 Bright Red Grand Prix McLaren 3.1 Intercooled Turbo, 14.819 @ 92.72, 189whp
1999 Grand Prix GT 9.75:1|K&N|160 tstat|No Ubend/Cat/Res|UD Pulleys|Ported M90/TB/Heads|XPZ|2.55"|Pacesetters|Stage 2 I/C. 12.442 @ 112.78
2000 Blue Bonneville SSEi Supercharged Gutted Airbox|K&N|3.4"|1.9'*|WP Pulley|Custom DHP|180*stat|41932'*|No Cat. 14.681 @ 94.80
2002 Dark Cherry Grand Prix GTP Supercharged & Intercooled
12.084 @ 114.38 w/1.743 60', 315.6whp, Fastest Stock Cam M90 GTP!
NOW XP CAMMED, 340.6whp with XP, stock heads, Gen 3 M90, 11.984 @ 115.84 w/1.750 60'!
Most HP Stock Heads Gen 3 M90 GTP!
2004 Red Monte SS Supercharged K&N|3.4 Pulley|1.9'*|180*stat|41919 plugs|3" dp|No cat/ubend|DHP|Shift Kit. 14.2 @ 98
GOT BOOST??? Friends dont let friends drive stock!