Quick ?

irishsetter · Post by **irishsetter** » Mon Oct 10, 2005 12:49 pm

Can I use a NA MAF on my 91 turbo?

ej22t · Post by **ej22t** » Mon Oct 10, 2005 11:45 pm

gt2.5turbo · Post by **gt2.5turbo** » Tue Oct 11, 2005 12:08 am

/thread

irishsetter · Post by **irishsetter** » Tue Oct 11, 2005 12:49 am

Ok thanks.

wiscon_mark · Post by **wiscon_mark** » Tue Oct 11, 2005 12:55 am

that was easy

vrg3 · Post by **vrg3** » Tue Oct 11, 2005 3:34 am

Yes. You can use a MAF from a 90-91 5-speed non-turbo.

Natoe · Post by **Natoe** » Sun Nov 06, 2005 9:29 am

so this comes out as yes.. or no?

i have my impreza 1.8L MAF (1995) and am going to swap over to legacy wiring and ecu now, can i use the impreza MAF since the plug is the same from the engine harness for the legacy?

vrg3 · Post by **vrg3** » Sun Nov 06, 2005 4:17 pm

For you the answer is no.

Natoe · Post by **Natoe** » Mon Nov 07, 2005 6:52 am

really... its completely different than even the NA legacy one that you say works? this blows, that means i need a new MAF

, but i can get a NA legacy one from 91-94?

vrg3 · Post by **vrg3** » Mon Nov 07, 2005 3:03 pm

Yes; it's completely different. See my first post to this thread to find out what cars' sensors you can use.

Natoe · Post by **Natoe** » Mon Nov 07, 2005 7:00 pm

ok thanks man, i agree with subylvr2212's statement, hehe

bmxpunk · Post by **bmxpunk** » Wed Nov 09, 2005 8:28 pm

Natoe you wont want to use it. I started to on mine then I switched to using the legacy one with my impreza ecu. the legacy one seems to read a much broader range. What would be an upgrade from the legacy turbo as far as a MAF sensor goes. I wanna see if that would fix some of my super rich condition, not to mention I am getting really close to 5 volts already on only like 7-8psi and I wanna do 15.

vrg3 · Post by **vrg3** » Wed Nov 09, 2005 8:36 pm

The Legacy Turbo sensor has a smaller range than the Impreza sensor.

bmxpunk · Post by **bmxpunk** » Wed Nov 09, 2005 8:40 pm

Than my 95 impreza1.8L maf sensor?????? That thing was maxed out most of the time and my car ran like crap, which was weird because it matched the ecu, my legacy one is a hitachi or whatever and the pins dont match up.

vrg3 · Post by **vrg3** » Wed Nov 09, 2005 8:43 pm

Yep. A smaller range.

The connectors are the same. It's just that two of the pins are more or less redundant (they're both grounds), and one of the pins is only used by Hitachi sensors (to inform the ECU that they're Hitachi), so some pins may be missing on either side of the connector depending on the sensor and on the car.

bmxpunk · Post by **bmxpunk** » Wed Nov 09, 2005 8:51 pm

Dang. So what would be the best upgrade if I wanna run 15 Psi or later 18 when I get a new turbo? what car does it come off. or a part number.

vrg3 · Post by **vrg3** » Wed Nov 09, 2005 9:05 pm

The one that matches the rest of your engine management.

bmxpunk · Post by **bmxpunk** » Wed Nov 09, 2005 9:16 pm

There is no upgrade????

vrg3 · Post by **vrg3** » Wed Nov 09, 2005 9:17 pm

What would you imagine an upgrade MAF to be?

bmxpunk · Post by **bmxpunk** » Wed Nov 09, 2005 9:21 pm

I dont know, just something that isnt maxing out when I am only pushing less than 10psi

vrg3 · Post by **vrg3** » Wed Nov 09, 2005 9:25 pm

If you just want larger range, use your EJ18 sensor.

Do you understand what substituting MAF sensors does to an engine management system?

bmxpunk · Post by **bmxpunk** » Wed Nov 09, 2005 9:50 pm

please explain. I understand mechanical. tuning and electronics are new to me.

I just sold the MAF to my 1.8

vrg3 · Post by **vrg3** » Wed Nov 09, 2005 9:58 pm

Well, in brief -- The computer needs to know what's going on in the engine. It uses sensors to do that. When you put the wrong sensor in, it misreads what's happening and does the wrong thing.

It's a system.

bmxpunk · Post by **bmxpunk** » Wed Nov 09, 2005 11:26 pm

Ok I understand it is a system. I am using an EJ22t with an impreza 1.8 ecu and Rallitek perfect power smt6. The reason I was wondering if there is an Upgrade or Bigger MAF is because my computer is thinking it is supplying 180cc injectors, yet I have 370. Down low it is rich city. so if the MAF were calibrated different (in my thinking anyway) It would send a lower voltage reading to the ecu, which would send less fuel to the injectors. I deserately need to lean out the bottom and not just with the perfect power (taht is a story I dont want to get into right now) so then this (my "ideal") Bigger MAF would also read the more air coming in when I had the throttle wide open throttle which would richen my top end giving me more power and a better margin of safety for my motor. Does that make sense or am I am idiot?

vrg3 · Post by **vrg3** » Thu Nov 10, 2005 1:05 am

Oh. So you're using a Perfect Power to manipulate all the stuff... You probably want to ask Sean or someone else at Rallitek this question. They can tell you what will match your engine management.

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