MUHAHAHAHA you're welcome I consider it a part time job to make sure people don't use the wrong word.

I'm sorry but IAT's play a HUGE role in detonation threshold so what you are basically doing is pumping a whole hell of a lot of air that can be 50-150 degrees above ambient/what the MAF is telling the ecu it is and expecting it's effect on ignition timing to be negligible? That is why the stillen kits clack away like a tap dancing festival once they are heat soaked and the ecu starts pulling gobs of timing as the knock sensor pick it up.

I didnt think of the supercharger situation with the "suck through" maf. I was thinking only of the Turbo setup with the Mafs in their stock locations. But your right if the Maf is upstream of the FI setup (turbo or supercharger). The fix to that problem is just to move the MAFs to right before the throttle bodies. Then you can deal with it in much the same way we do with the turbo kits.

So yes your right didn't think of that condition during my reply but its an easy fix that would make that kit much easier to tune.

I was thinking more along the lines of a 5-10F increase as the metered air enters the heat soaked plenum.

Well with the stillen kit you would have to put the mafs after the in manifold cooler, which isnt possible hence the need for a secondary iat sensor

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What about using a gtr maf? There a $150.00

Well in the gtr forum's going from 2.75 to 3" dropped the readings from 4.91 to 4.6 but retuen well be needed. Also the gtr maf's well work in the 370 but not sure yet if there any better

But they are using them pull-through, right? If they are using them pull-through and getting HP that would be high for a 370z, then they might work out really well for us in a blow-through application.

I have confirmed the are the same part number and I believe they are pull thru I'm waiting on My contact from nissan to give me a call back. But the gtr can make up 800 whp on there maf's so I think that mite be the ticket. If so I well be grabbing them for $150 a piece can't beat that. I remember still en saying that they contacted nissan and got a pull thru maf's for there s/c kit...not sure I'm still researching...

Same part number as what? As the Z? if so, that would be no good

I'm sorry i ment style

nope they re the same part number i was guess my typing was right the first time. sorry

Ill just go by the Nissan dealership and pull some off when they aren't looking. If they are pull through like charles said and were now using them to blow through then they should work perfectly for our situation.

i know for fact the 3" charge pipes well help you and i hope the gtr maf's come thru...when the new charge pipes you well need to re tune cuz ur start running a lil lean

Same part number means the same part, it would be a waste of time swapping in the "different" MAFs. Looking for other differences between the two cars would be much more productive, stuff like the larger intake piping that has been mentioned.

That's what I'm doing on my kit is bumping it up to 3" charge pipe so I won't have this problem

with the vsr turbo kit my tuner told me my maf is maxed out also.
at 10-10.5 psi so my only option is uprev maf 700.00

You always have 2 options.

1. Different MAF
2. Larger diameter piping your sticking that MAF into

or actually there is a 3rd that I became aware of
3. Using a spacer to move the center of the MAF closer to the sidewall of the boost tube.

So what actually happens when a MAF is maxed out? How would you know if your tuner wasn't watching it? What if you just threw more psi at it then the MAF is capable of?

Well it stops being able to measure the air over a set value. Lets say this maf maxes out at 80 lbs/min of air. The engine is using this "metered" air to determine how much fuel to inject during open loop operation (under load). All is fine as long as the tune is such that the amount of air going in is correctly matched up with an amount of fuel going in.

But now what happens if you run 90 lbs/min of air. Well as far as the computer knows your still only running 80 lbs/min. So it injects enough fuel to satisfy 80 pounds not the 90 your are running. So you start to lean out. And leaning out will only last a short time before you detonate and pop the engine.

If your tuner wasnt watching it you would see it on the dyno during a WOT run, look at your AFRs, if they appear to lean out as your rpms increase then you could very well be seeing the limits of the MAF (of course this is invalid if the tuner for whatever reason leans out the mixture via the target tables or if your actually draining your fuel rail).

That would be the easiest way to catch it without having access or seeing a log of the car.


For me right now I am running very rich so that when I hit the limit of the MAF I still have more than enough fuel to satisfy the burn. Its unsafe but as long as boost stays consistent I can have some safety in it like this. Still very undesirable and that is why I am looking to fix this issue.

Thanks for the explanation Mitco. I need a fix for this also!! I was planning on running 14 to 16 lbs.

Are we sure that the GT-R MAF's would work?

No I think it was noted that they are the same MAFs that we have in our car. I am willing to bet they switch over to speed density tuning which allows them to just tune via the boost. Then out of boost they run the maf for its ability to be more refined.

That is very correct. The maf's can take the gtr to high 600 and then it switch to map which is unlimited. Ecutek said when they released there race romantic we would be able to do the same but as right now there on pace for GTM standard of never. But just wishful thinking that they could make it happen

Bummer! I found new GT-R Maf's for $80. :rolleyes:

$$$ - Cuz they can.

UpRev MAF GT - Accessories

So everyone that has gone built has had to buy these?

No you can go with a bigger MAF housing, which is what I am trying to get my hands on currently. When I do I will share my results on here and see how much more you can flow through a 3" instead of a 2.75". This will allow for a the stock maf to register a larger airflow without having to change the MAF.

A little excerpt I found in one of my tuning books. The idea that you could essentially run via a map is a little intriguing.

http://img.photobucket.com/albums/v2...g?t=1408661953

For the guys who want 3in charge pipes the material $339.00 with tall maf adapters and without blow off adapters. That's just the material u can get it and have someone fab it up its real easy if u can weld aluminum.thats all new pipe from the intercooler to the TB's...I'm doing this soon as I get home I don't want to run Into the problem some of u guys r having...it should lower ur volt to around 4.3 from 4.9...

Do you have a link to the pipe sections?

It's a local place that I work with but u can check out treadstoneperformance.Com but there expensive but check it out..

This is basically what the oldschool HKS VPC did. MAP piggyback that outputs a simulated MAF signal to emulate the original sensor.

This will not work on the 370z. Unless you locked the VVEL shafts in a static position or something, you cannot run a VHR off speed density during engine vacuum.

I will have the 3" charge pipes available for the BP customers. These will be about $280, powder coated, and a direct drop in for the 2.75" pipes. 4 new couplers will be included as well as 4 new T-bolt clamps.

Dam I wish I could get pipe that cheap

according to their website it is just Hitachi part # W0133-1723137. I doubt the modify them at all, and they can be found for $200 on other sites.

What website did u find them for 200 ..I'll buy them to try it out.

Sasha are you going to try and run the tall maf weld ins

Sasha, When will these be built? I can imagine you have a ridiculous amount of other things to get done as well but I would love to get these on my car. My built block is under way and will be installed in a few days then the break in period will be another couple weeks. Id love to get the 3" pipes on there so I can tune it right after the break in.

When did you decide on a built motor? You were all about stock block replacement a few weeks back.

Minor thread jack, sorry Mitch:tiphat:

But why couldnt you set it up to only emulate under boost the leave the lower flow rates of the MAF alone if thats the case? Doubt its worth the hassle, just my curiosity asking the questions haha.

Cant wait to get my hands on a set. :driving:

As I read it James this is the part number that it replaces, so if you have that part number then this aftermarket MAF will work? No idea if thats correct its just how I understood it.