PDA

View Full Version : To MAF or not to MAF, that is the question (MAP vs. MAF)


TurbLu
12-14-2006, 10:06 AM
So guys I've got most of my top mount turbo components sitting in my room awaiting install. But now I need to choose my engine management. Locals around my area say I should go Power FC with the MAP sensor setup. But alot of people just run an Enthalpy Tune with a z32 maf. I am going to be running a Top Mount Presicion sc34 Turbo which is pretty much a bad *** t3/t4 capable of 500whp with amazing spool up time. (My 1.8 GSR was running an sc61 and had 25psi by 4500rpms.... thats a much larger turbo)

http://www.precisionturbo.net/turbochargers-display.php?company_id=101795&category_id=3026

So guys list why we should stay MAF or go MAP....

Gavster
12-15-2006, 09:26 AM
Well....to me...after having done several "tuned" maf cars....map is totally the way to go. More consistent, easier to tune, etc its just better flat out. Im getting PFC w/ MAP on my new RB setup....its affordable and give you way more potential IMO. Its silly not to if you ask me!

smelly240
12-15-2006, 10:05 AM
for 500HP maf is fine, but theres positives to both maf and map... Map is based on a calculation, while maf actually meters the # of air molecules via temp loss... With map it needs to take pressure, temp, rpm, tps and calculate how much air it "educatedly guesses" went into the cylinders. The maf uses its internal temp sensor, and a heated resistor wire and ultimately measures that way. There are 1200HP maf cars, so your 500 shouldnt be a problem with a maf, but then again AEM rocks it out hardcore, and power FC is good for DIYers that arent tryin to go too nuts.

you can tune your own ecu with a daughterboard and get 500hp as well, just its limited (not positive what powerFC's limits are - but they arent much more IIRC). If ur goin map - aem or haltech might be more what u want to make big #'s. If there was a definate "better" one - im pretty sure we wouldnt see maf's on any D1 cars. Nomura's 34 has a maf set up in blowthrough, kazama's s15 has n62 maf as well.

I still think that if ur shootin for huge power go map, but remember any changes you make to your car with a map setup - u have to retune it moreso that with a maf.

what else do you have besides a turbo?

harlockssx
12-15-2006, 10:41 AM
Being a former ROM based guy myself...switching to a Power FC was the best thing I ever did! It made tuning SO much simpler & faster. Driveability was MUCH better too! The downside to using an L-Jetro (mafs) over a D-Jetro (Map) is the Z32 mafs maxxes out ~550 rwhp. Ther've been some guys running more than that, but the meter is maxxed out, which can be damgerous at high rpm/boost levels...I've made 522 rwhp on my setup in Japan, and the mafs was nearing its threshold, but I still had some more room, as I use a blow through setup with only the Z32 mafs sensor element itself (housing is cut off) inside 80mm intercooler piping (after the intercooler outlet, before the TB) which seems to give me a little more room upstairs than a draw through. When I switched, it dropped down my max AF percentage by ~15%(!!!) over using regular draw through.

I've been toying with the idea of using an SCT mafs, from the Mustang aftermarket, as there are 1000+ rwhp cars out here using them & the Ford mafs also uses 0-5 Volt signal hotwire like the Nissans. I believe it would just ba a matter of re-wiring it & going to tune a bit. I contacted SCT themselves & asked some questions, but apparantly no one's tried using them on a Nissan yet, although some people (JWT) have used Cobra & Lightning mafs with their tunes. DON'T get me wrong, the D-Jetro is the best all around setup for our cars (In my opinion) for a self tuner, especially with FC Dataloggit...but I just couldn't see spending another ~$1200 for something I really didn't need to upgrade from (yet).

Now once I switch engines down the road to my fully built SR (I'm currently using a stock longblock S13 blacktop) & crank up the boost some more, I'm going to have to do something else. I will probably go for the Mustang SCT setup though...

The fully built SR has all forged internals, all new oiling system, ARP head & main studs, fully ported head with Tomei solid lifters & 270 Procams (12.5mm), 1.2mm Tomei HG & RAS as well as Nismo bearings. It's sitting patiently in my garage, waiting...

santacruisin
03-07-2007, 03:29 PM
what sucks about a PFC DJetro is that hardly anybody can tune it! You need a special cable and laptop software to tune with the unit properly. Check the apexi website to see if there is a "Power Excel" dealer near you b/c they are pretty much the only people that can tune with the MAP.

This has been a real PIA for me so far. There is only one Power Excel dealer in Nor Cal and they are not convenient to get to and from. If ur gonna go D Jetro make sure you get all of your mods for it ready first! That way you won't have to go back a bunch of times for tuning.

DJ_Sunrise
03-07-2007, 04:37 PM
i run the power fc with MAFS, i regret i didnt go the MAP route.. its been a while since a discussion came up.. but if im not mistaken, power fc is comparatively as complex, although easier to tune.. as aem ems.. and with an fc datalogit style program coming out in EU soon, it will far exceed any standalone ive seen. i cant remember the name of the guy making it, but its fuckin amazing.. ill try to find his website.

smelly240
03-07-2007, 04:42 PM
dead thread revival crew... :P
--didnt you look at the post date? the poster was the guy doin the hotwheels GB and no ones heard from.

boostin13b
03-07-2007, 04:45 PM
I'm running a lot of the same setup. Precision SC34, peak boost top mount. I'm running AEM. If you have the money and someone to tune AEM, I would recomend it, but the same goes for pretty much any standalone. If you don't have someone to tune a standalone, rom tune is the way to go. But given the fact that you have stepped up to a top mount with 500+ capabilities, I would guess you would want to take the step to either power FC or AEM. It pretty much depends on who you have to tune either of those for which one you want to pick. Overall the AEM has more capabilities, but power FC is well worth the money.

smelly240
03-07-2007, 06:04 PM
they guy that asked about this in December hasnt been posting... i agree about the aem being the best for making the big #s...

santacruisin
03-08-2007, 04:41 PM
dead thread revival crew... :P
--didnt you look at the post date? the poster was the guy doin the hotwheels GB and no ones heard from.

OP doesn't matter b/c there is still some good info in this thread! Its better to continue with more useful information rather than clog zilvia with a bunch of new threads that are about the same thing. Don't you agree?:)