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Old 02-27-2005, 04:15 PM   #1
Scooby Specialist
Member#: 37716
Join Date: Jun 2003
Chapter/Region: TXIC
Location: Houston, TX (sugarland, TX)
2002 ej257 Black WRX

Default How do you tune with a cutout with a utec?


utec w/ tuna
modded injectors
TBE to stock muffler
GT Spec gen II header + uppipe

Normally i would tune my car with my exhaust how it is, with the 3" HKS downpipe to my home made 3" midsection to stock muffler. I used to have an electrical cutout by QTP but the thing always leaked and broke on me 2 months later. I still have an extension that comes out of my downpipe (like maybe 4" or 3" long at the most), but it has a plate that covers it. went to the track the other week and i decided to take the plate off and see the results. I gained 2 mph on my trap . Put the plate back on in less than 5 minutes (3 bolts) and then drove home in quiet.

So today i took off the plate just for fun and i noticed that the AFRs on my Tuna were ridiculous high. For instance, at idle, my AFRs were from lowest to highest 16 - 18.

I know the reason is because the o2 sensor is right where the cutout is, but, i was just wondering how would one tune with a cutout?

Here are some pics:

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Last edited by jefersun; 02-27-2005 at 04:22 PM.
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