I've been having problems with my turbo swap since I've finished it. Finnally I am ready to start troubleshooting myself. I think part of my problem has to do witht hat fact that I'm still using a draw through MAF setup in the stock MAF housing.

When ever I'm at any kind of good boost... 12+ and high in the revs the car ***** out and pulls all timing, I get knock, and it starts to fire flames. I think they are all contributed to me maxing out the MAF sensor and the car trying to go into limp mode without loosing any boost.

I'm ready to convert to a blow through setup or possibly get a larger MAF housing. I think the final answer will be converting to a blow through. So, I really could use some help with what you guys who have done tuning wise to correct for the boosted MAF. My Idea is to put it right after the BOV on my 1 charge pipe, but, from what I understand you don't want to have the MAF on the Hot side. There is no way to stick on on the cold side unless I run another intercooler (other than stock). It would be very close to the BOV too, any recommendations how far away it should be from it?>??

Any and all help is appreciated. Tell me whats fucked up and how I can fix it.

 

Do you have a 3" maf housing?

if not thats bad.

 

No, I'm using the stock maf housing. Its the stock air box hacked up.

 

well I've been saying that's your issue for a while now. Swap that bitch around.

 

Yeah I finally got my own HP tuners and a sticker and I am Home for once. So, I can actually start.

What do I need to do tuning wise to make it run blow through??

 

just basically rescale the maf.... probably gonna be off a lot though.

 

Just that one number in the scalier. I just have to set that and the rest should start to line up with a little bit of tweaking???

I think it's 1.300 right now.

 

no no, you gotta go into the actual maf output freq table and go through that. Just changing the scaler number isn't going to clear up everything since depending on the turbo, it changes through the range.

 

I just was looking at that table thinking about screwing with it, but my tune was spot on for 10 psi. I saw the post over on the HP tuners boards... I'm not running an air-air at all. Just strait into the intake mani. right over the motor. Do you think i should setup a small air-air to run that right like you?? I guess it couldn't hurt.

Thanks for the help Paul.

 

no prob, as long as you have a full 3" pipe to the t/b you can get away with it, but once you start going for higher boost levels (15psi and up at minimum) you really need to run an FMIC on there, I honestly don't know the limit of the stock IC system, but when I was running an FMIC and the stock IC setup it did wonders for my IAT2s, plus give you room for smooth bends which = less turbulance and a smoother airflow through the maf.

 

Sounds good. I'm gonna work on getting some piping made up to run it like it is now just blow through. Then I have to track down an lk9 manifold and an IC and get that all ready before race season.

 

I got it together finally. The car barely runs. How much did you change the "maf fq vs output" table? I went double what it was before and it got close at idle and cruise but no where near close when it hits boost.

 

I changed it a whole hell of a lot. It was quite of few hours of tweaking to get it close to where I want it.

 

That's the only table you changed before you started power tuning? Did you car run right at the first startup?

 

it ran, that's about it lol. But it actually drove 38 miles with out being tuned without an issue.s

 

maf needs to be a distance away from the BOV. and AFTER the bov in the system.

3in housing is a must.

after that, pull up AFR error and start dialing the MAF with your WB log'd into HPT.

 

The MAF is after the BOV and intercooler by feet. I have a 3.5 inch housing. Could that be a problem???

Edit: No need to worry if that's as problem. I'm going to go get rid of the 3.5 housing now and get the MAF bung stuck on some 3 in pipe. I don't know why I got that anyway. Hopefully tomorrow I will be able to have that done and to continue tuning.

Thanks for the help!!

 

3.5" is your issue, but you could tune it to work, just gonna need a massive rescaling job. Or switch to 3" piping and it'll be easier

 

Yes, I just ordered a 3 inch housing after failing to dremmel mine apart. I should be able toget back to working on it this weekend. Maybe in a few weeks I will have some real numbers to do my setup justice.