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1.5J 180

Tune check after exhaust diameter change?

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Hey,

 

Recently had the exhaust changed on my 180SX and wondering whether I should have the tune looked at and retouched if needed to be on the safe side, given the increased diameter. Cautious as the car mainly gets tracked and is running near max injector duty cycle.

 

1.5JZ running 24psi on e85

 

Old setup: 4' dump and front pipe to 3' cat back (no cat) single cannon muffler

 

New: 4' dump into 3.5' from dump (no cat) and single straight through muffler

 

Cars running haltech boost control and wideband O2 trimming

Edited by 1.5J 180

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Going from smaller to wider, from restriction to free flowing.. you won't need a check up at all.. the motor is breathing better and making more power/torque with less chances of knock.

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Thanks mate, wasn't sure whether it would raise the boost at all and lean it out a little maybe with less backpressure

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