Topgunz full supercharger kits!!

DrBacon · 10-07-2019, 11:23 PM

I may be the first person in history to ask this question, but: how would I go about lowering the boost? I imagine swapping out one of the pulleys, which one though and where would I get one? The car is currently making 12.7psi of boost and Sebastian thinks more timing and less boost would be beneficial with the fuel I have available to me.

Senna-F1 · 10-07-2019, 11:27 PM

Quote:

Originally Posted by DrBacon

I may be the first person in history to ask this question, but: how would I go about lowering the boost? I imagine swapping out one of the pulleys, which one though and where would I get one? The car is currently making 12.7psi of boost and Sebastian thinks more timing and less boost would be beneficial with the fuel I have available to me.

Hmmm... so the car only makes too much boost at or near redline, correct?

So he wants you to sacrifice boost and power in the other 90% of the rev range in order to increase it at the very end, where you probably will spend very little time?

DrBacon · 10-07-2019, 11:43 PM

Quote:

Originally Posted by Senna-F1

Hmmm... so the car only makes too much boost at or near redline, correct?

So he wants you to sacrifice boost and power in the other 90% of the rev range in order to increase it at the very end, where you probably will spend very little time?

I am just relaying the information I was told. I think it's pretty safe to say Sebastian with his knowledge and experience is probably the undisputed best tuner for this platform, I trust his advice. I am however thinking I might put the car on a dyno to see how much power it makes at the current boost/timing, then play with the pulleys and have the timing adjusted and get the car re-dynoed, it would make for a nice comparison and I'll be able to know for sure which is ideal. But yes, you're right, it would ultimately depend on what I want more, more peak power or more power everywhere else. I haven't made that decision yet and I think comparing two dynos would be the best way to make that choice. If I'm only losing a little bit of power down low but making a decent amount more at the top end, then yeah that would probably be what I'd go with.

"Z"en · 10-08-2019, 08:05 AM

Quote:

Originally Posted by DrBacon

I am just relaying the information I was told. I think it's pretty safe to say Sebastian with his knowledge and experience is probably the undisputed best tuner for this platform, I trust his advice. I am however thinking I might put the car on a dyno to see how much power it makes at the current boost/timing, then play with the pulleys and have the timing adjusted and get the car re-dynoed, it would make for a nice comparison and I'll be able to know for sure which is ideal. But yes, you're right, it would ultimately depend on what I want more, more peak power or more power everywhere else. I haven't made that decision yet and I think comparing two dynos would be the best way to make that choice. If I'm only losing a little bit of power down low but making a decent amount more at the top end, then yeah that would probably be what I'd go with.

I'm interested in your supporting mods, too. Curious about the reason of lowering boost. I've been running 13psi on stock block of filter on and pump 93 gas for up to 6500 miles with no issues. What fuel are you using? What exhaust system (cat/catless/header/test pipes/cbe/pipe diameters) are you using? What fuel system are you using? What ignition timing is with your car? Increasing volumetric efficiency by means of better intake and exhaust can benefit power without the need of too much boost and is always good to do so, but it's better to let us know your mods first so that one could comprehend the reason. Lowering boost can be achieved by either a larger jackshaft pulley (serpentine side) or a larger supercharger pulley (supercharger side).

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10-07-2019, 11:23 PM	#1 (permalink)
DrBacon Enthusiast Member Join Date: Nov 2016 Location: Washington Posts: 286 Drives: 2014 Nismo Rep Power: 27365	I may be the first person in history to ask this question, but: how would I go about lowering the boost? I imagine swapping out one of the pulleys, which one though and where would I get one? The car is currently making 12.7psi of boost and Sebastian thinks more timing and less boost would be beneficial with the fuel I have available to me.