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Discussion Starter #1
Can any BPU guys tell me changes in horsepower (or changes in 1/4 trap speed) after adding a VPC alone. It is hard to believe, but I've heard of some people being no faster (and sometimes slower!) in the 1/4 mile after the VPC (I'm just trying to give myself another reason to wait for the AEM unit, and avoid the VPC)
 
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Discussion Starter #2
it's all about the tuning, properly tuned, there is no reason a bpu+vpc should not beat a plain bpu.

regardless of the fuel controller, aem, fields, afc, vpc/gcc, you're still gonna have to tune it and that'll make the most difference.
 
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Discussion Starter #3
I gained 22 rwhp with just adding the VPC, NO TUNING. Others have experienced similiar results.
 
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Walser said:
I gained 22 rwhp with just adding the VPC, NO TUNING. Others have experienced similiar results.
Thanks Walser
 
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Discussion Starter #5
would those supras using map rather than the maf sensor attain similar hp gains?
 
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