Using a MAFT to run speed density. Possible?

[ltho98]

Ok, now our karmann vortex sensors have a frequency output into the ecu and the value of the frequency is proportional to flow.

The hotwire mas uses a voltage instead of a frequency as an output to the ecu.

The MAFT translates that voltage into a frequency so the ecu can interpret it.

My question is.. is it possible to use a MAP sensor which also has a voltage output to be used in conjunction with an IAT to provide for a speed-density type setup using the MAFT instead of dropping the bills for a VPC?

 

[awdrst]

http://www.maftpro.com/

Heres a link for new maft. It will let you run the car in speed density setup. Price isnt that bad pre orders are 399. Just something to look at.

 

[ltho98]

Yeah, thats what actually triggered my curiosity, the only thing is that it isn't available now.. and i need it now. I can get a MAFT for around 75 bucks to top it all off.

 

[98spydert]

The easy answer; No. The regular MAF-T doesn't have the multiple inputs for MAP and IAT or the capacity to calculate the signal from those non existant multiple inputs to send to the ECU. Figure out a way around those two issues and you might have something.

 

[Kevin Jewer]

What is it about the speed density setup that you need? People are logging up to 80 lbs/min on a regular MAFt with no signs of over run, seems like that would be enough for most poeple. Just a suggestion, I obviously don't know what your plans are.

 

[ltho98]

Apologies for the vagueness.

From my experience of seeing cars running VPC/AFC combos the car seems to be much more easier to tune, the MAF acts as a restriction, the car is just more driveable, and more resistant to changes in the ECU. This is what hints to me that running speed-density is superior to running a MAF. If I am wrong, by all means someone come in and correct me.

However, what i'm trying to achieve is to use a speed-density setup using a MAFT (instead of a VPC), an IAT, and a standard GM 3-bar. Now hopefully the advantage of this is we can compensate for injector sizes using the MAFT instead of having to swap out chips like you would in a VPC.

However, after a bit more research- i'm stumbling onto other issues. For example, what is the operation of the stock dsm IAT? If voltage increases does that mean hotter or colder temperature? or getting around other things like what do you do with the MPI relay? how do you compensate for the barometric pressure sensor?

Ideas anyone?

 

[pudhed]

However, what i'm trying to achieve is to use a speed-density setup using a MAFT (instead of a VPC), an IAT, and a standard GM 3-bar.

Ideas anyone?

The MAFT can't run in speed density mode, but you can run a speed density chip, and plug the GM 3-bar directly to the ECU. You would need an ostrich rom emulator to tune it.

 

[talon_boy69]

I think on making this a year ago, I even did a thread, but I thought that gm maf and map outputs were just voltage. The maf actually is a frquency, I think...if it is a frecuency then it can't be done without modifing the rom as pudhed said.

BTW...the maft pro would be out soon...Hope this month...I'll be getting one too.

 

[talon_boy69]

pudhed already designed a speed density system for our cars.

yeah I saw that in his profile, forgot to ask...but still would like to hear it