How to tune afc for mileage AND power?
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Well sure as hell I went upstairs to my wife and told her its for sale. I'm tired of being let down with this damn thing. I wouldn't be half mad if the mileage was good when it was running, but since I got it tuned and did all the work to it I'm getting 4mpg LESS on the highway than stock w/ a 3yo fuel filter! So what exactly could it be then? I'll check for shaftplay and the impeller tomorrow. But what else? Doesn't appear to be any boost leaks.
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if the turbo sounds like its spooling and theres grinding noise, then the turbo seems to be ok. make sure on the bottom boots by the intercooler they didnt blow a hole in the bottoms. or something. if the turbo sounds fine, it should be fine. you obviously not getting the air into the manifold, and it wouldnt hurt getting new upgraded boots and clamps anyway.
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Ya no noises yet. I'm checking the imp shaft and blades tomorrow. Also gonna check the flanges for proper fit and secure and dtuff like that. Gonna check stuff and report back to u guys. I'm sooo pissed tho this second turbo better not be fried.
---AutoMerged DoublePost---
The impeller shaft still spins. Checked for obvious boost leaks again, nothing happened. Truck doesnt smoke TERRIBLY like it did the first time I friend my turbo; I can drive down the road and not smoke too bad. But as soon as I hit 1800+rpms it starts sputtering and popping like crazy. All the flanges are tight. Afc is looking good. I have a line going from the intake manifold to the afc, so the line from the afc to the wg is staying capped.
Somethign I noticed when driving it today. The turbo is NOT as loud as it was, and when I let off the gas the air doesn't "woosh" back into the intake.
Another thing I thought of was even when the truck was working right, the first cold-start of the day if I gave it too much throttle around 1800rpms or so it would pop and sputter real bad until its driven for a few miles. Dunno if its relevant or not.
---AutoMerged DoublePost---
The impeller shaft still spins. Checked for obvious boost leaks again, nothing happened. Truck doesnt smoke TERRIBLY like it did the first time I friend my turbo; I can drive down the road and not smoke too bad. But as soon as I hit 1800+rpms it starts sputtering and popping like crazy. All the flanges are tight. Afc is looking good. I have a line going from the intake manifold to the afc, so the line from the afc to the wg is staying capped.
Somethign I noticed when driving it today. The turbo is NOT as loud as it was, and when I let off the gas the air doesn't "woosh" back into the intake.
Another thing I thought of was even when the truck was working right, the first cold-start of the day if I gave it too much throttle around 1800rpms or so it would pop and sputter real bad until its driven for a few miles. Dunno if its relevant or not.
Last edited by 85_305; 04-13-2010 at 09:56 AM. Reason: Automerged Doublepost
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