Hacked MAFS

[Doya]

If I use a hacked mafs and 370cc injecters, don't I still have to use an fmu? Also, what size pipe should I use for the mafs, 3"? Thanks

[neverlift]

I would research the stickies it sounds like you are confused. Research will save you money.

[Chris28]

What is a hacked MAF? Domestic guys run MAFs that are compensated for the size injectors they are running, but you can't do that with a Nissan, or I have yet to see it done.

If you get a ROM tune and 370's, then you do not need to use an FMU.

[neverlift]

hacked maf is a sohc maf and s14 maf thing, sohc is sketchy unless someone else can chime in. The s14 maf is plastic and its design allows you to chop away everything but the maf element and install it into a larger diameter pipe to cheaply compensate for larger injectors.

A local guy named orion did this like 10 years ago lol , it made more power than his jwt tuned ecu. look up kadevelopment.... the guy is awesome, he offered to tow the shell that was donated to me for free! not cheap for him in a titan.

An fmu boosts fuel pressure x psi per 1 psi of manifold pressure. They are cheap and work well with a walbro and low boost. IMHO if you are gonna do larger injectors and a tuned ecu go for bigger than 370, but if on a hacked maf I would limit myself at 370cc.

[Chris28]

http://www.ka24development.com/hacked_MAF.html

I'm reading now haha

[Doya]

http://www.ka24development.com/hacked_MAF.html

I'm reading now haha

That was were I got the idea from. I just thought that if you upgrade your injecters you have to have some kind of tune or something, but I guess thats what the hacked mafs is for. I only wanted to do this because I thought I could make more power with this than with an fmu.

[WDRacing]

The Hacked maf is something we used to do when we had crap for tuning options. It actually works quite well if you do it right and remember to retard your base timing and or run a msd btm.

You need an adjustable fuel pressure regulator to get everything just right for the idle.

I'm probably going to use this method with a set of 42lb injectors and the MSD BTM. I'll do a really good write-up if I go this route.

FYI, this should also extend the HP range of the stock maf to 300ish whp vs the barely 250 it can handle now.

WD

[neverlift]

Yeah man brian said he liked it more than the jwt ecu and it made more ponies but safety comes into play at some point and I geuss he thought it to be safer on the tuned ecu. I know for a fact the few tunes from them I saw are at the best conservative, which is great and keeps them from purchasing new motors for customers.

I have seen 12psi dyno's with fmu walbro and timing retard break 300whp. But I'd assume that was well maxing the afm and fuel pump... The guy dd'd it for a while and sold out for a bmw

[Nizmo-Nuts]

Could I use a hacked mafs with a fmu and stock injectors? I have a 10:1 fmu so I no I can supply enough fuel, I just need to get more air to compensate.

[WDRacing]

Could I use a hacked mafs with a fmu and stock injectors? I have a 10:1 fmu so I no I can supply enough fuel, I just need to get more air to compensate.

The FMU is a rising rate fuel pressure regulator. It adds fuel by increasing the fuel pressure, in your case, 10 psi for every 1 psi of boost. What would you need more air for? Why would you need a Hacked MAF and how could it add air to compensate for the fuel being delivered by the FMU?

The FMU is only meant to be used with stock injectors and a stock ecu. It's simple and effective at what it does.

The Hacked MAF is a way of fooling the ecu into allowing you to run larger injectors. Thats it...

WD

[WDRacing]

If Brian had run the MSD BTM he would never have upgraded to a rom tune. Retarding the base timing is a very crude way to run boost. All off boost driving to include cruise suffers quite a bit. Not to mention the gas mileage goes into the crapper.

Hacked MAF + MSD BTM = WIN.

It's funny to see things like this come back around after 3-4 years.

WD

[Nizmo-Nuts]

The FMU is a rising rate fuel pressure regulator. It adds fuel by increasing the fuel pressure, in your case, 10 psi for every 1 psi of boost. What would you need more air for? Why would you need a Hacked MAF and how could it add air to compensate for the fuel being delivered by the FMU?

The FMU is only meant to be used with stock injectors and a stock ecu. It's simple and effective at what it does.

The Hacked MAF is a way of fooling the ecu into allowing you to run larger injectors. Thats it...

WD

I wanted to turn up the boost so I thought that would be a good way to do it

[neverlift]

lol I am actually looking for one(btm) so I can get the best of both worlds. I've seen them local on cl for 50~75 bux. Just timing is never right or I have bigger fish to fry when they are available. I wonder if one could be made inexpensively However I agree I was gettting 20plus mpg while drifting with the tuned ecu.

I need to hook up with him so Cory can get his power trans, but I'll ask if he ever thought about the btm.