Tune question for removing cats

Bagga 44 · Jul 20, 2015

My tuner (one of the major 3) is saying no revision needed for going from cats to offload xpipe. Can anyone confirm this is a normal? He is saying its baked into calibration. I don't want to name him and just asking if anyone else has gone from cats to no cats without tune revision.

mackdog2008 · Jul 20, 2015

Bagga 44 said:
My tuner (one of the major 3) is saying no revision needed for going from cats to offload xpipe. Can anyone confirm this is a normal? He is saying its baked into calibration. I don't want to name him and just asking if anyone else has gone from cats to no cats without tune revision.

You need a revision, you will get a check engine light if you don't.

jdos1 · Jul 20, 2015

mackdog2008 said:
You need a revision, you will get a check engine light if you don't.

This plus...
It needs a datalog and revision when you switch to get the most power gain out of the swap.

Marc · Jul 20, 2015

Agreed. Needs revising. Data logging. Enjoying.

Bagga 44 · Jul 20, 2015

Thanks Gents, not getting the warm fuzziness feeling from my tuner recommendations.

mackdog2008 · Jul 20, 2015

Bagga 44 said:
Thanks Gents, not getting the warm fuzziness feeling from my tuner recommendations.

It's not Walmart is it ?

Rotard · Jul 20, 2015

Go Lund if you're straight.

I would never run these cars without cats on a stock tune. My old 2v however, I ran it on a strategy tune that I tinkered with and it worked fine lol. Perfect AFR at WOT and idle.

Bagga 44 · Jul 20, 2015

I already have a tune for my long tubes and xpipe with high flow cats. I just ordered the xpipe without cats.

Rotard · Jul 20, 2015

You still need to log it for no cats.

bunits19714 · Jul 20, 2015

I went from a tuned and cai tuned car to a off road x pipe last year and my tuner already had the rear o2 turned off so I didn't need a revision-(I even called him and he said not needed when I made the switch) Obvious data logging never hurts and your tuner can get more aggressive with current data and no cats- but my car ran fine with no cel's or codes.

jdos1 · Jul 21, 2015

Didn't know you had LT's and a catted mid. Those cats are likely hi-flows and the tuner may have already turned the rear o2's off in the tune you're running know. Not much to be gained switching from hi-flows to o/r so the tune may not need tweaked, hence why your tuner said it was ok. I'd still definitely datalog after the pipe swap and compare it to previous datalog results/send back for tweaking if need be.

hcbob259 · Jul 21, 2015

I did the same thing but in reverse with my 07 gt. I had an off road x pipe and switched to a high flow cat x pipe. the dyno tuner said i didnt need a revision because the rear o2s were already off

scottmach · Jul 21, 2015

Lund tune right? What he meant was your rear o2's are already off in the tune. Lund does this unless you request them to be left on.

Bagga 44 · Jul 30, 2015

Well 100 miles and no CEL. Car picked up 25hp on the dyno and everything is running great. I even noticed the car runs about 20 degrees cooler. Track this weekend and will see what ET is picked up. I firmly believe the aftermarket hi flow cats were an issue from day one. Long tubes and cars were the first mod I did at 700 miles on the odometer.

Tune question for removing cats

Bagga 44

mackdog2008

jdos1

Marc

Bagga 44

mackdog2008

Rotard

Bagga 44

Rotard

bunits19714

jdos1

hcbob259

scottmach

Bagga 44

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