So ever since i got the Walboro and a re-tune, everytime i shift real fast, the car gets loud backfires...I was at the track last friday and everyone told me i was shooting orange flames out when i shifted from 1-2 and 3-4..Whats the cause for this? The car has a 11.5-11.6 A/F across the board

 

IMO, its normal.

But I am not an expert.

 

Same here. Myne started when I added my turbo back exhaust. I always thought it was because our cars run so rich it was burning the extra fuel in the exhaust.

 

It never did it before until i got a fuel pump and a retune

 

Do you find it only happens at real high rpms?

 

Yes

 

same here actually got on it this morn and pop pop pop. i think it sounds mean.

 

Are you flatshifting 1/2 and 3/4?
If so then thats the reason.

High RPM, the ecu first cuts the ignition when it initially hits the limiter. Therefore overfueling occurs. Hence pop and flamage.

 

Do you mean powershifting? If so, the answer is no. I lift on every gear

 

It's just a backfire. Generally from any combination of running rich and having a big exhaust. Not having a cat makes it more pronounced.

 

Sorry...yeah Powershifting/flatshifting/no-lift-to-shift....all the same thing.

I'm only guessing here, but perhaps the ecu isn't reacting quick enough too shut off injectors when you lift off, hence a little overfueling is happening since they're firing flat out at high rpm.
Only a guess though...sorry.

 

Sounds like an exhaust leak.

 

Catless this'll happen. Seen this at the track repeatedly on other cars with stage 1 cars (exhaust/tune) that are catless when letting off at high rpms. Happens.

 

thats exactly what it is, its very normal so don't worry!

 

I dont think so.... Did you read what i said? It started doing it after a Fuel pump install and a retune


Thanks for the imput guys!