02 OZ Rally Auto Question
Dec 19, 2016, 03:12 PM
#46
I turboed mine, but I never drove the car too much for fuel economy. I'm always pedal to the floor. But I always get 23-25mpg In the city, full boost. To be honest, a tuned car is a tuned car. You can only lean a car out so much before you lose mpg and you can only add so much timing before you start to lose power. So what I'm saying, doing modifications without a tune, especially to the MAF will hurt fuel economy. A tune should make your fuel economy better. I doubt you'll have much of a difference from stock to modified if you tune it properly. You'll for sure need a wideband
Dec 20, 2016, 08:54 AM
#47
I turboed mine, but I never drove the car too much for fuel economy. I'm always pedal to the floor. But I always get 23-25mpg In the city, full boost. To be honest, a tuned car is a tuned car. You can only lean a car out so much before you lose mpg and you can only add so much timing before you start to lose power. So what I'm saying, doing modifications without a tune, especially to the MAF will hurt fuel economy. A tune should make your fuel economy better. I doubt you'll have much of a difference from stock to modified if you tune it properly. You'll for sure need a wideband
Any recommendations on that wideband? I've got a place for it, already, if a downstream location is viable.
Last edited by CJBarker2; Dec 20, 2016 at 08:55 AM. Reason: Typo
Dec 22, 2016, 09:19 AM
#50
I've got 4-2-1 headers and might be able to put a bung in the 2-1 weld, which would be about 15 inches from the flange. I've come across the UEGO sensors and they look like a pretty good bet. Also looking at a generic A/F gauge for now, buying based on product ratings. I've had pretty good luck with the cheap but not cheapest stuff in the past. Thanks, guys.
Dec 22, 2016, 09:47 AM
#51
Originally Posted by CJBarker2
I've got 4-2-1 headers and might be able to put a bung in the 2-1 weld, which would be about 15 inches from the flange. I've come across the UEGO sensors and they look like a pretty good bet. Also looking at a generic A/F gauge for now, buying based on product ratings. I've had pretty good luck with the cheap but not cheapest stuff in the past. Thanks, guys.
Dec 22, 2016, 10:35 AM
#52
Put the wideband in the downpipe. I'd stay at least a foot away from the flange that connects the downpipe and the header. But you also don't want to just put it where your downstream o2 sensor is. The reason we mentioned the widebands we did. Those are the real options you have for data logging with evoscan.
I have this header set and plan to rerun the exhaust with a cat between the O2 sensors. There are two bungs downstream of the flange on the downpipe. Could I just use one of those two that are there when I get the pipe rerun? Thanks for catching me before I could make a mistake like that!
Dec 22, 2016, 07:41 PM
#54
Thanks, man. That means that I can keep the wiring practically inside the cabin. I've got it all wrapped up, though. That shouldn't pose a problem, should it?
Dec 22, 2016, 07:45 PM
#55
Is that also going to take the place of the cat? If so, I'd just remove the rear o2 sensor all together and disable the rear o2 sensor in ecuflash. Visually, everything like look copacetic and function properly. I'd also run the wide band sensor wires up thru the same access hole
Dec 22, 2016, 09:41 PM
#56
Yeah, man, I wish I could do that, but NC requires cats and annual inspections. It doesn't help any that the car is set up for Cali smog. Even if I delete it in ECUflash, I would still need to have proof that the cat is both there and functioning to avoid a pretty good fine. Right now, because of the previous owner, I can pass emissions without any kind of cat as long as I don't run premium fuel. I'd prefer to have the downstream functioning to save myself trouble in legal issues because once I get this finished, the car is getting a full facelift, which will make everyone in law enforcement suspect me of a cat delete. Really need the fallback plan haha
Dec 23, 2016, 12:32 AM
#57
They require inspection and emissions in my county in PA as well. You should be able to pass emissions no matter what fuel you run. The test is only checking to make sure you don't have any codes present in your ecu. Visually you could fail for not having a catalytic converter. I don't have a cat on 3 of my cars. I never had an issue passing anything. But I also take my car to the same person every year and never take it to a dealer
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