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Old 04-09-2003, 04:43 PM   #1
protouring72
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Member#: 13190
Join Date: Dec 2001
Location: 294whp
Vehicle:
02 Vishnu Stage 2

Default Anyone experiencing backfiring with Vishnu Stage 2 or similar set up?

Just curious, i have a Vishnu Stage 2 and get some backfires occasionally when I rev-match to downshift and sometimes between gears when up-shifting. Is this normal? Am I running rich or something? Any comments or input would be appreciated.
John
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Old 04-09-2003, 04:46 PM   #2
cnk
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Member#: 10757
Join Date: Oct 2001
Chapter/Region: Tri-State
Location: NJ
Vehicle:
2013 BRZ Limited 6MT
DGM

Default

Hey John,

It's Calvin. . we met a while back. Most people that have removed cats on their cars will get afterfiring, which is what you're hearing. Even a stock car gets this, but the cats usually drown out the noise. With a catless or highflow cat setup, you will hear it more often. I get it as well on my Stage 1 setup. Nothing to worry about. If you backfire, i.e. explosion in the intake tract, then I would worry. If it's just popping noises when you let off the throttle during shifting, it's just un-burnt fuel igniting in the exhaust.

Calvin
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Old 04-10-2003, 11:15 PM   #3
protouring72
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Member#: 13190
Join Date: Dec 2001
Location: 294whp
Vehicle:
02 Vishnu Stage 2

Default

Hey Calvin,
Thanks for the response. It did this occasionally, but now it seems to be more frequent, maybe it's the changing of the seasons. I even put on my stock BOV so it would recirculate and not run rich between gears. I'll just ride it out!
Thanks again,
John
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