BlackRx7

Just wondering saw it in a few threads and was wondering if it was possible with e stock ecu, the RX8 has it so why not?

SonicRaT

iTrader: (6)

Explain what you mean by 'hotwire'?

BlackRx7

like mustangs have....

SonicRaT

iTrader: (6)

That doesn't help me none, I wouldn't even get near a mustang, let alone learn anything about them!

j200pruf

iTrader: (4)

Mean like use one of those trick aftermarket AFM that they my for 5.0 mustangs. As far as I have been told they won't work with the S4 ecu.

NZConvertible

A hotwire type airflow meter (aka MAF) is completely different to a flap or cone type AFM. The software used to read them is also completely different, meaning you can't just wire one up to your FC's ECU. It won't work.

BTW, I don't know why Mustang's got mentioned. Hot-wire AFM's have been used in most EFI cars since the early 90's.

Scott 89t2

only if you get a greddy e-manage...

mr_vaughn

iTrader: (1)

i was looking into getting a S-AFC but are now going with the E-Manage since it supports different Air flow meters.

I found this for the hot wire sensors.
http://www.pro-flow.com/Import/import%20front.htm

gsracer

you can swap AFM's with the e-manage...but only within the same type. So unfortunately we can't swap to a hotwire; we're stuck with the flap type.

Does anyone have any knowledge about the cosmo afm? It's the only afm that might be worthwhile to swap onto an FC.

RETed

Why do you want to do this?
The more superior method of least intake restriction is the MAP sensor based load.
Almost all of the easily available stand-alone EMS brands can do this.
With the most popular hovering around $1,000, what's the big deal?
Megasquirt is a cheaper alternative if you can build and diagnose electronics.

By the time you install and tweak everything to run nicely, you could've had a Haltech, Microtech, Wolf3D running by then...

You're not going to gain that much just by removing or replacing the stock AFM.


-Ted

gsracer

For the suckers still on the stock afm, such as myself, a larger AFM would give a little more headroom before the AFM maxes out.

RETed

Are we talking turbo or NA???


-Ted

gsracer

Turbo.

nitroracer

iTrader: (5)

i know what your talking about. some thing like the dsm guys do. you a translator, that wires into a GM mas, the you can put the gm mass on the ic piping.
that would be so awsome for our car.

totallimmortal

I knowI couldn't do it but since it's all just voltage signals coming out of any type of AFM or MAF, shouldn't it be possible to rewire and possibly use some resistors to make the MAF put out a signal like the stock AFM did?

BlackRx7

damn this post is over a year old!!!! I can't even remember posting it, must a been one of those drunk surfing night

anywho this seems like it would be a good idea, but apply ourselves we must!!!!

RETed

Blame mr_vaughn!

The stock ECU will max out with the stock AFM, so I don't understand why you want more capacity.

The stock boost sensor maxes out at 15psi.

The stock fuel injectors max out caacity at around 250bhp.


-Ted

RETed

Blame mr_vaughn!

The stock ECU will max out with the stock AFM, so I don't understand why you want more capacity.

The stock boost sensor maxes out at 15psi.

The stock fuel injectors max out capacity at around 250bhp.


-Ted

gsracer

I'm using 720's all around. Eventually the AFM voltage signal will drop down to zero. Once the voltage is 0, it becomes impossible to modify this signal, since any percentage of 0 is still going to be 0.

If there were a larger AFM, it would take more power to max the signal out. It doesn't really matter to me when the stock fuel injectors max out, or when the stock pressure sensor maxes out since I'm using an external pressure sensor and like previously mentioned larger injectors.

pip

What about using a maf translator similar to the ones dsm tuners use? From what I understand it converts the signal of a gm maf (hotwire I believe) to be readable by the stock ecu. Although from what ted is saying it doesnt sound like there are really any gains to be had, just wondering if someone maybe had made one before.

j200pruf

iTrader: (4)

I was just thinking about making a translotor type of thing, why couldn't someone do that? Seems anyone with a good electrical engeering background could do.

Novacaine

I remember reading a post a while back where some one on the board was doing just that. but they were having a hard time making it work. I don't know how many eletrical engineers are on this forum, but it would seem possible. I think it was mazdaspeed7 that was trying but I could be pulling things out of my a$$

RETed

There is a point of diminishing returns with the stock ECU.
At a certain point, it is highly recommended to go to an aftermarket stand-alone EMS.


-Ted

gsracer

Absolutely I agree, but it would be nice to be able to push the envelope just a tiny bit.

mr_vaughn

iTrader: (1)

i have decided

was thinking about the S-AFC but ....

i am going with the E-manage with injector stuff and pressure sensor stuff since you can use the e-manage to control fuel by pressure or the AFM.

So when the AFM flat lines(reaches max) the e-manage can control fuel based off of pressure.

Also i am going to try and mount the AFM after the turbo and before my greddy FMIC. to test a hesitation issue i am having.