I just recently popped in my old P73 ecu to go on a long-distance drive when I noticed that the smell of exhaust fumes is greatly decreased compared to my tuned P28.

My car was tuned a couple years ago, and it wasn't until I threw on the stock ecu that I noticed that my car exhausted that much more heavily with the P28. Without bringing my car back to the tuner, is there much I can do? Can local tuners just lean it out a bit, or is that unsafe without a full tuning session?

 

Drop your fuel pressure a few say from like 60 to 45. or it your at 45 got to 40 . .. . With the Tuned rich ECU is installed..

Hit a local spot that can burn a map with crome. Have them take a look .

Or Go in for the full retune.

 

Whichever ecu your car was tuned on is the ecu you should run. Changing it to a p73 ecu is changing all the fuel settings.

 

Whats your car tuned on.. i can edit it, if you want.

 

The motor was a jdm itr, so I was just running the stock ecu (p73, unless I have the numbers wrong It's been a while since I've read up on this stuff)

It was tuned on crome.

Gas mileage should typically be better on tuned ecu's, no? Seems like I usually get worse mileage with this tuned ecu than stock.