Ive got a vg 3rd gen and do to space I was wondering if it matter where the maf was located far as it is infront the turbo inlet or if i stick it between the boost outlet and the intake on the motor I see a lot of 4th gens done this way but most of them were intercooled. Does it matter if it is intercooled for the location.

 

You can still put it between the turbo and the TB, without an IC. Just get it closer to the TB than the BOV.

www.turbomaxima.com has some 3rd gen pics

 

For driveability's sake, it is easier to go pressurized on the 4th gen.. not sure about 3rd. Intercooled or not shouldn't matter

 

i have mine before the turbo and i didnt have any problems with it

 

Won't cause a PROBLEM so to speak, but on any car that requires MAS, it should be as close to the throttle body as possible. the closer it is, the better the throttle response will be. Remeber, that is what is telling you ECU its time to dump fuel into the engine. When in doubt go blow-thru

 

i wouldn't recommend putting the maf after the turbo. i always seemed to have trouble with that setup (read more air than i was really pushing so it ran insanely rich) plus when my turbo went it put a nice amount of oil on the sensor ruining it.

in terms of the reading, my s-afc would read upwards of 80% air flow and sometimes even more with the maf on the charged side. with it on the non-charged side its lucky to read 50% (means that i have a bit more room for more boost).

all percentage figures are based at running 7-8 psi on a 300zx "t3" turbo.

 

OK maybe I see getting a more satisfactory reading as a reason for going suck through, I never ran a turbo on my Max so maybe that's the case, but fear of oil from a blown turbo?? thats kind of a dumb reason really don't you think?

 

Hmmm. I guess it's dumb until it happens to you.

I'm really surprised with mtcookson's experience with the difference in air flow. I don't see why that would be. I got identical flow % from the safc with the maf before and after the SC. But eventually I moved the maf to the pressurized side because of backflow problems during shifting and coasting. Turbos aren't as susceptible as superchargers in that respect, though.

 

yeah, if your turbo blows and coats your sensor with hot oil there's a high chance of ruining the sensor. really though, that's something that you gererally don't have to worry about if you get a new turbo and let it cool down properly but i'm using an old turbo off of an 85 300zx so that's one of the bigger reasons it died early.

as for the different airflow readings i have an idea of what could have been causing that. the way my intake piping was done (done by an exhaust shop) it was basically a 2 inch pipe at the start (turbo) and ended as a 3.25 inch (intake manifold).

basically what i think happened is, where i put my maf was in front of one of the transitions. the transition was about 2.5 inches while i had the maf sensor in the 3 inch section. i think since the 2.5 inch section was so close to the sensor that might have been causing some problems... but i'm unsure.

i do know for sure that my intake piping sucks real bad and needs to be redone with an intercooler setup and mandrel bends.

 

So you've basically just nullified both reasons you previously stated for using a suck-through set-up.

 

how so? what's the point to even take the chance of blowing a 150-300 dollar piece when you can just as easily avoid that by putting the maf on the non-pressure side?

even if you did get a new turbo there are still chances of blowing the seals so it won't always be the safest... its just safer than going with a used turbo.

 

HOW MUCH!?!? wow if thats what it costs to replace I'd be mounting that **** in the cockpit. You guys need to get w/ Ramchargers. I use a 3.5 inch GM MAF with RC's translator but if it were to get ruined they are like 30-50 bux on the net. That sux.

 

yes, that's how much it costs to get a stock replacement.

why are you using such a big maf? that would throw the readings off quite a bit unless corrected and if they were corrected you're really not gaining much over the stock maf.

if you use a different maf the ecu needs to be reprogrammed to handle the different readings.

 

Its not on a Maxima, sorry should have said that. Pretty common mod for me as well as for GN's. My stock unit won't support over 300hp. I had to upgrade the MAF pretty much before anything else. I meant see if RC could do something up for you guys.