Jump to content
Ultimate Subaru Message Board

Bigger Maf Sensor


Recommended Posts

Hello guys,

 

I'm looking to add a bigger air flow sensor (Maf) to my XT6. I have been looking for a while and my avenues are exhausted. I've tried to get an SVX Maf to work on two occasions but the voltage range that is sent to the ECU is incompatible during idle. It would just get into the acceptable voltage range at WOT (Wide Open Throttle). I'm looking for an air flow sensor with an inside diameter of 3" (or maybe even slightly bigger but 3" is enough).

 

Does anyone know of one I could use for an 1989 2.7ltr XT6? Has anyone tried this before? I'm sorry if this is a repost. I thought I posted here but couldn't find it but I did post on the SVX Network a while back. Any help would be GREATLY appreciated. Thanks!

Link to comment
Share on other sites

can you change the internals of the svx one? ie: resitors?
I have tried to swap the externals (plug/wires) of the XT6 to an SVX's Maf but it seems the internals of both Mafs are welded in place just before it connects to the outside of the sensor itself. You have to see the inside of it to understand what I'm talking about. That's how I screwed up my 1st SVX maf and an XT6 maf.

 

I have also tried just using the wiring from an SVX Maf and connect it to the XT6s wiring harness. The XT6 has a 'burn-off' wire that is only used when the ignition is turned off so I ignored that. All the other wires fit. Problem was the voltage range of the SVX Maf wire going to the ECU being different than the stock XT6 Maf voltage. It threw it out of spec so an immediate check engine light would come on and idle would die off since the ECU couldn't 'talk' to the SVX maf properly. If I went WOT, it would try and hang in there since the WOT voltage was barely in spec but as soon as I let off, the car would die.

 

This is what I posted in another thread/another site:

"Looking into it further I think I know why it doesn't and won't work. Our air flow sensor sends a signal to the ECU in the range of 1-2V (I'm at work so I'm doing this from...er...bad memory). The SVX air flow sensor sends a "signal from the MAF 0-.3v w/ ignition on, .8-1.2 idling", as stated earlier in the post. Well, looking at that you can see where a problem will arise. This would explain why it idled the first night with a check engine light and then the check engine light went out every time I gave it gas. Giving it gas took it up to the 1.2 range which would bring it into the 1-2V range our ECU needs. That's my take. "

 

So now I'm still looking for something else.

Link to comment
Share on other sites

figure out how much you need to drop the voltage and add a resistor to compensate for it might work.. go ask some of the guys on the diy-efi message thing i am sure one of them can give you better info than i can

i just copy exsisting circuits i can't make my own lol

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...