how do we turn up the boost - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Forced Induction All questions and problems regarding Superchargers, Turbos, NOS, ZEX, intercoolers, water injection, etc.

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Old 09-26-2003, 12:01 PM   #11
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Tom,
what does the SSEi'* boost gauge read now at WOT?
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Old 09-26-2003, 09:19 PM   #12
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like 8-9 psi im going to the tract tomorrow i wanted to get like 10-11 but im just going to run it the way it is
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Old 09-28-2003, 03:19 PM   #13
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Quote:
like 8-9 psi im going to the tract tomorrow i wanted to get like 10-11 but im just going to run it the way it is
Hope your track runs turned out OK. They will make a good baseline comparison for your future mods.
The only way I could get more boost from my stock 7 psi was to go with the smaller SC pulley. Now it will produce 9-10 psi. More importantly that just the gauge numbers is the massive increase in seat of the pants feel and acceleration improvement. Just remember not to go too small or it will work against you because the computer will pull timing if it detects any knock. Make sure you have lowered your intake and exhaust restrictions and keep that intake charge as cool as possible.
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Old 09-29-2003, 12:50 PM   #14
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I don't understand why people change the pulley. Sure you increase the boost pressure by a small amount, but the supercharger then spins 2000-3000rpms faster. I estimate this would probably produce around 30% more heat. When air is heated it expands, just like anything else. If the air expands, you have less density in your engine, thus decreasing the performance gain, that explains the use of an intercooler. I think an intercooler beneath the supercharger is one of the best mods you can do to your car. Installed beneath the supercharger, it would cool the superheated air comming from the supercharger to a nice cool temperature, which is good... Most people probably have noticed that their cars have a noticeable HP gain when it'* cool and damp out.

Back on topic though.. The supercharger will also draw more engine power to power itself, thus negating the performance "gain" you hope to achieve. A pulley "upgrade" is not something that I plan on doing, and i am not sure why my info says i have a 3.4"pulley, because we have the stock pulley.

Just my $0.02
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Old 09-29-2003, 03:39 PM   #15
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Quote:
I don't understand why people change the pulley. Sure you increase the boost pressure by a small amount, but the supercharger then spins 2000-3000rpms faster. I estimate this would probably produce around 30% more heat. When air is heated it expands, just like anything else. If the air expands, you have less density in your engine, thus decreasing the performance gain, that explains the use of an intercooler. I think an intercooler beneath the supercharger is one of the best mods you can do to your car. Installed beneath the supercharger, it would cool the superheated air comming from the supercharger to a nice cool temperature, which is good... Most people probably have noticed that their cars have a noticeable HP gain when it'* cool and damp out.

Back on topic though.. The supercharger will also draw more engine power to power itself, thus negating the performance "gain" you hope to achieve. A pulley "upgrade" is not something that I plan on doing, and i am not sure why my info says i have a 3.4"pulley, because we have the stock pulley.

Just my $0.02
I understand your thinking here, and that is why you can only run so small of a pulley. Obviously a smaller pulley is going to increase boost & heat, but the increase in air at a hotter temp provides more of a gain than less air at a colder temp. More air = more fuel = bigger boom = more horsepower. After a certain point the superchargers get inefficient and you have to run a bigger supercharger or a turbocharger to see a gain. These blowers (M90 & M62) like to make 12-15psi, but any more than that and they are really inefficient. A 3.4 pulley on the M90 is the BEST modification you could possibly do to an L67. It provides PROVEN gains of 25hp & 50lb.ft of torque.

The intercooler does help tons though! It is the only way to go IMHO if you want to get serious with your L67!
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