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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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Old 03-03-2004, 06:38 AM   #2
Big Ron
Member#: 18062
Join Date: Apr 2002
Chapter/Region: MAIC
Location: I can save you a ton of cash
on car parts so PM
me b4 j00 buy


It's normal, get used to it. There are 50,000 reasons why it does it, but the most commonly known one is the engine revs after shift to burn off extra fuel for lower emissions caused by the upshift.
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Old 03-03-2004, 01:11 PM   #3
Scooby Newbie
Member#: 50202
Join Date: Dec 2003
Location: El Paso Texas
2006 STi


Thats all I needed to hear Thanx alot.
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Old 03-03-2004, 02:01 PM   #4
Scooby Guru
Member#: 42549
Join Date: Aug 2003
Chapter/Region: Tri-State
Location: You can find me in the 203
E92 BMW M3
2011 VW TDI Wagon


Any problem with Open/closed loop sensor?

Supposedly running a TBE and MBC will cause problems with 04, though it is fixable with reflash...
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Old 03-03-2004, 10:57 PM   #5
Scooby Specialist
Member#: 35004
Join Date: Apr 2003
Chapter/Region: TXIC
Location: Dallas
88 __/ ] \_/
. -o-----o- ///M5


Does it happen when you get it above 5k rpm at wot?
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Old 03-03-2004, 10:59 PM   #6
Scooby Newbie
Member#: 30825
Join Date: Dec 2002
Location: North Hollywood, CA~818
2004 EVO V/// (8)
MIA sfVoltron MeMb3R


I have an 02 with a Borla Hush, a Bosal DP etc etc ..

Does the same thing .. Its common and in the 20+ Subaru's I've been in they all do it ... Dont need to fret ...
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