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Tune check after exhaust diameter change? - Hardtuned.net

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Tune check after exhaust diameter change? 

2 replies to this topic

#1 1.5J 180

  • Joined:01-March 15
  • Location:Australia QLD
  • Car:180SX

Posted 04 February 2017 - 09:20 AM


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, 04 February 2017 - 09:21 AM.

#2 Dose Pipe Sutututu

  • Joined:19-January 05
  • Location:Australia NSW
  • Car:Boat Sutututuutu

Posted 04 February 2017 - 09:31 PM

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.

#3 1.5J 180

  • Joined:01-March 15
  • Location:Australia QLD
  • Car:180SX

Posted 06 February 2017 - 11:34 PM

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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