I'm doing a bit of fine tuning on a friend's moderately modified Evo 10. Its making 430 whp DJ, and the MAF is hitting 4.92 V peak. He told me that there are some people who have replaced or who are planning to replace the MAF with a larger unit. I searched around in this forum and the engine forum, and all I found was this thread:

https://www.evolutionm.net/forums/ev...housing-x.html

Anything else on the topic?

 

My MAF just went yesterday, and I'm paying $180 for a new one, but I've read of alot of people with bad MAF's, and I'm no where near 430whp

 

Whats done to the car... how much boost and what turbo setup?

 

I am using a 3.5" maf housing. AMS uses a 3" maf housing on their intake. The maf calibration for my 3.5" is very close to the area difference versus both the ams and the stock maf.

 

Intake, Red, cams, headwork, exhaust. 26 psi peak tapering to 25 psi at 8000 rpm.

Where did you get your housing? Did you rescale the MAF calibration tables?

 

Lomker and I are both running the same 3.5" intake right now. A local place fabbed it up for us and they are planning to vendor it through MAP.

Call/Email MAP if you want and ask them about the Primo 3.5" intake, they will know

 

Good info. Thank you. A few more questions if you've got a sec. 1) I did a little searching online, and it looks like its just a housing swap where the housing is essentially just a larger diameter tube. Is that correct? 2) Did you make any changes to the MAF scaling table?

 

The AEM intake also uses it's own MAF housing which is bigger then stock, it's around 3"

I've found you will end up having to scale the MAF tables approx 12-13% higher.

It sounds like you still have a bit of room left if you are "only" hitting 4.92v

- Bryan

 

The Primo intake is a complete 3.5" intake, including the MAF housing. You do lose some resolution the bigger the intake pipe is, but you have to go bigger with hotwire cars, just like on Subbies and Mustangs.

Yes, my tuner did rescale the MAF tables for the intake. I would share it with you if I did it, but its my tuners work

 

Thanks guys. No prob on not posting the rescaled table. I've can do that myself.

Bryan, you've seen the signal go all the way to 5.00 V?

 

Yup



- Bryan

 

Good to know. We're not seeing it go lean, but we are still on 92 oct. E85 could be as early as next week.

 

This car sounds like a blast!

I'd definitely recommend the bigger tube. I have a scaling for a particular 3" that I can send over via PM if you'd like it.

 

I think we'll be going with the 3" MAF tube soon.

The powerband is amazing. Up to 6500 rpm, its almost identical to my Evo 9 stock turbo E85 setup, but after that, my power starts to drop while his just keeps climbing. I think peak power is somewhere out around 8500 rpm, and if we were to let it rev that far (haven't convinced him to let it rev that far yet), it should make 450 whp DJ.

 

I would recommend not revving a stock 4B11 past 8k.

The head flows very well so you'll want to but....

- Bryan