3.75L Build thread

**sketch** · 03-22-2013, 04:24 PM

Originally Posted by Greg E

I should post up how I clean valve covers before powder coating. Its a relatively simple process that keeps everything out of where it doesn't belong.

Please, do.

**futurevr4man** · 03-25-2013, 01:31 PM

so the car is tuned on 18psi. its fast, dont get me wrong, but not as fast as it should be. i built a pressure tester yesterday and as soon as the weather quits sucking i will test my system.

i am still working on getting rid of my lean spike as im coming into boost. once boost hits, its fine, but before that its really struggling. could be a vac leak, idk.

at idle my wideband is reading full lean, but the car is pig rich. im having a hard time figuring that out as well. i will recalibrate my wideband when i do the pressure test. hopefully everything will get fixed!

**AdamVR4** · 03-25-2013, 04:01 PM

Pig rich based on NBO2 reading or smell?

**futurevr4man** · 03-25-2013, 09:10 PM

smell. you have any ideas?

my low fuel trim is pegged 12.5% rich but thats due to my pcv being setup incorrectly. figured i could tune around it, but my wideband is reading full lean so i cant.

**green-lantern** · 03-25-2013, 09:14 PM

.........................................

**TurboSinceBirth** · 03-26-2013, 12:40 AM

It sounds like you have some big vacuum leaks. Lean throttle tip in and idle were both symptoms when I was chasing around leaks. I always knew my car developed them when those things happen. I'd definitely pressure test as soon as you can.

**Greg E** · 03-26-2013, 07:37 AM

Originally Posted by TurboSinceBirth

It sounds like you have some big vacuum leaks. Lean throttle tip in and idle were both symptoms when I was chasing around leaks. I always knew my car developed them when those things happen. I'd definitely pressure test as soon as you can.

I think the MAFT is under rating the airflow the engine is actually seeing. I think adding a couple clicks to the base knob will help bring it back to where it should.

**futurevr4man** · 03-26-2013, 10:11 AM

Well, ok let's say the maft is underrating the airflow and I have some vac leaks. The wideband should still not be reading full lean while the engine is running pig rich.

And yeah m not gonna dive the car until I pressure test it. I'm not sure how to pressure test my intake plenum half of my blow thru setup, the air will go right out of whatever valve is open. Anyone have an idea on that?

**Greg E** · 03-26-2013, 11:09 AM

I'd say either your wideband isn't in a great spot or your engine really isn't running rich.

**Chris@Rvengeperformance** · 03-26-2013, 11:11 AM

Do your trims read +12 or -12?

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