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Relocating the MAF into the charge pipe.

6058 Views 21 Replies 7 Participants Last post by  5banger
I should make my own mod thread for all of my mods but I don't plan on doing much. I just want to do some few simple mods to aid in tune accuracy and consistency. The best mpg's is the main goal because I have another vehicle that fulfills my power needs.

The reason for this mod is to allow the maf to see the actual airlow the engine will be ingesting. The problem with having the maf at the inlet of the compressor as opposed to in the cold side charge pipe is there could be a huge airflow difference between what the maf is reading from what's actually in the charge pipe due to pressure drop and IAT differences. If I move the maf into the charge pipe, the maf will see the true intake air temps and a more consistent airflow reading improving maf tunability throughout the operating range. Iat's can differ 30*+from the inlet tube to the charge pipe so the ignition timing tables will control timing much more acurrately and consistently as well.
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Discussion Starter · #8 ·
I had a custom turbo setup that used a draw through maf setup on my 08 Colorado 3.7. I reworked it for a blow through maf and it made a huge difference. It was very accurate and improved gas mileage, throttle response, and the whole nine yards. It was a night and day difference.
 

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Discussion Starter · #14 · (Edited)
I'm so happy with this mod. The car runs much smoother and the shifting actually feels better due to a more accurate airflow/torque calculation acquired partially from the MAF readings. No more mid range boost and fuel trims inconsistencies. Looking forward to getting the bnr catless downpipe. I really want to remove the resonator and second cat with a straight pipe as well.
 

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Discussion Starter · #16 ·
Very nice. You have some serious fab skills.
Looks like GM performance is selling an exhaust kit that's 50% less restrictive. It looks nice, but is expensive.
I might come around to making my own axle back but I think a straight pipe in place of the second cat and the resonator will sound loud enough for me. I like how quiet the car is.
 

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Discussion Starter · #18 ·
I raised the shift points and now if feels like it pulls much harder and doesn't fall on it's face on each shift. Less rpm drop on each shift now. 40-80MPH seems much stronger now. I'll get a new video up when I get the chance.
 

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Discussion Starter · #20 ·
Tried posting this 4 times so hopefully it works this time....
Wrapped the charge pipes with thermacool heat reflective insulated tape. I'll be making my own 304 stainless catless downpipe and wrapping it and the midpipe with header wrap to drop underhood temps as much as possible. I'd like to get the gmpp exhaust but it's pricey. I might just do a second cat and resonator delete pipe so it's not much louder than stock while keeping the stock muffler.
 

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Discussion Starter · #22 ·
Peak torque is not 2k rpm. Mine is around 4200 rpm. I'm actually keeping the stock shift rpm as I'm shooting for the best mpg's. Plus I've learned what it wants with cam tuning. Still calculates to 210 ft/lbs of torque in the data. I'm good with that if I can manage 55+MPG highway.
 
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