Thread: RPM spike
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Old 03-03-2004, 01:05 AM   #1
Scooby Newbie
Member#: 50202
Join Date: Dec 2003
Location: El Paso Texas
2006 STi

Question RPM spike

I've had my '04 Subie for 4 months and 4500 miles. I have a borla hush sysytem w/ high flow cat in last cat position, tbxs manual boost controller (set at 14 psi w/ boost gauge), forge blow off valve, and helix uppipe. The problem is that my RPM's keep on spiking 200-350 RPM b/t the 2-3 and 3-4 upshift. I know the engine runs rich with a 100% atm bov. Is this the reason or what? Thanx
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