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The car back fires a bit now, is this a common thing?

Not sure if its related to the rear muffler or tune related. Its like its throwing out unburnt fuel on deceleration. Its extremely loud

What ecu are u using?

Its a Wolf 3D V4, and a turbosmart raceport atmo BOV was put on with the rest of the gear.

Its only back firing in the lower revs driving normally around town, it doesn't cough or blow flames on WOT

It doesnt run an AFM its a MAP sensor setup

Edited by GotsWapan

I've heard the japs don't even use AFR they just use exhaust temp and go rich as hell and smash the timing into the motors.

This is good. Engines out of cars should be able to be used in boats...... and held flat for a day or 2.....

They live long and happy lives then.

Wow, ile show you a pic of my SR20's piston when I tuned it to 12.5:1, half the side of the piston melted lol was at 18pound though. I'd never tune above 12:1 now.

what is your peak timing @18psi? what where the egts?

The difference between 2 degrees of timing to effect detonation is as much as going from 12.6:1 A/F ratio to 12.0:1 (or 12.0:1 to 11.4:1).

what is your peak timing @18psi? what where the egts?

The difference between 2 degrees of timing to effect detonation is as much as going from 12.6:1 A/F ratio to 12.0:1 (or 12.0:1 to 11.4:1).

I found something similar in practice, on a hot day with my old tune 3rd gear ~18psi rattled like crazy, could hear the det without knock ears, a minute later 2 degrees out of peak torque and we could idle the car for 10 minutes getting the coolant >85c and it still wouldn't ping in 3rd even listening on the ears.

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