Hey all,

Running into afr issues with a friends jdm evo 8.
This has been quite the experience comming from the subaru world. There's some other issues we having that I'll toss in at the end. See if I can get a two-fer

SO, buddy imported a jdm evo 8, our 94 and 91 is absolute trash in northern Alberta and BC, so we decided to go ahead and tune for our local fuel rather than rely on the knock strategy. So we added a test pipe to get the cats out to the cat back that came with the car when imported, afr gauge and had a podfilter kit from japan etc. Car ran 18:1 on stock cruse, as soon as we switched to tephra it ran 14.7 on 02 control. We had the afrs dialed and finished the tune with some hiccups (will mention later).

Now that it's winter afrs are whack, like 17's cruise and 15s in boost. I proggressively cranked the air comp but to minimal success even at cruse, but on lift it runs into the 10s.

I wanna say this is an exhaust leak amplified by the cold, either from the size difference between the stock dp, and aftermarket c.b and test or a gasket playing silly bugger with the 02?


Also the other issues is ecuflash pulled the stock rom allright but wont flash to the car and evo scan won't log anything other than load with both tephra and stock rom. Evo scan will flash though, did the tune using knock ears and the load loggong with the afr gauge.

Thanks for attending my soap opra tia!