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Old 01-11-2009, 06:36 PM   #1
GR-RACING
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Default Help whit Turbo Problem

Well i made the car turbo and im having problems whit the MAP and this thing that i dont know the name of it


I keep Fuking them up when i push boost over 15psi

Im using a Greddy emanage ultimate is their any thing i can use to fix my problem

Thanks
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Old 01-11-2009, 09:48 PM   #2
PhilSine
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98 OBS-T, 91 Legacy SS

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That's the factory MAP sensor.

You can install a check valve that will allow vacuum one way but not boost the other way.
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Old 01-11-2009, 10:09 PM   #3
GR-RACING
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where can i buy this?
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Old 01-12-2009, 12:07 AM   #4
kaos200
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He has his car listed as a 99', that uses a MAF (mass air flow, not manifold air pressure) for airflow/fueling. There is an atmospheric pressure sensor (which it seems that arrow is pointing to), but no MAP.
But what exactly is failing, how are you determining that it is failing, etc.

Unfortunately, 99's burn through MAF sensors at an alarming rate when turbocharged =( Nevermind that the factory ecu + piggybacks are horrible. I'd never used the emanage with the stock RS ecu but I don't see it as the best option. You are better off swapping to a WRX harness, or going full standalone.
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Old 01-12-2009, 09:41 AM   #5
IllNastyImpreza
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Quote:
Originally Posted by kaos200 View Post
... You are better off swapping to a WRX harness, ....
if only it was that easy How long you think it would take to swap to a wrx harness ? are the sensors interchangable ? what would you have to switch over to WRX to get it to work ? and COULD it even work on your RS heads ?

It would be nice to get wrx tunability...AND be able to pass inpspection

But they have lots of bull**** like tumble valves and whatnot... wouldn't there be alot of other parts you would have to swap on top of the wrx harness ??
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Old 01-12-2009, 10:42 PM   #6
PhilSine
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Quote:
Originally Posted by kaos200 View Post
He has his car listed as a 99', that uses a MAF (mass air flow, not manifold air pressure) for airflow/fueling. There is an atmospheric pressure sensor (which it seems that arrow is pointing to), but no MAP.
But what exactly is failing, how are you determining that it is failing, etc.

Unfortunately, 99's burn through MAF sensors at an alarming rate when turbocharged =( Nevermind that the factory ecu + piggybacks are horrible. I'd never used the emanage with the stock RS ecu but I don't see it as the best option. You are better off swapping to a WRX harness, or going full standalone.
MAP sensor = Manifold Absolute Pressure sensor = Barometric Pressure sensor.

The 99 RS may not use the MAP sensor for primary fuel trims but it does exist on the car and that's where it is located.

The best way to know for sure if that is indeed the MAP sensor is to unplug it and see what CEL shows up. When the MAP sensor is unplugged the CEL is almost instant (within 5 minutes of start up).

A vacuum check valve can be purchased from most parts stores in the "Help" section for around $5.

As for the WRX ECU swap its not really an easy swap for most of the bolt-on FI builds. The E-Manage Ultimate is a very capable piggy back system boardering on a stand-alone system.

I'm working on doing an STi swap in my 98 OBS including the wiring harness and I recognize the fact that I will need all of the newer sensors that fit the STi and cannot re-use any of my EJ22 OBS sensors.

A WRX ECU swap is by no means impossible but an EMU wire-in is much simpler and quite effective.
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Old 01-12-2009, 11:02 PM   #7
IllNastyImpreza
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Quote:
Originally Posted by PhilSine View Post
...

I'm working on doing an STi swap in my 98 OBS including the wiring harness and I recognize the fact that I will need all of the newer sensors that fit the STi and cannot re-use any of my EJ22 OBS sensors.

A WRX ECU swap is by no means impossible but an EMU wire-in is much simpler and quite effective.
good luck with that ! I mean that unsarcasticly lol Out of curiousity I would like to know exactly WHAT needs to be swapped out from your remaining "old school" parts. ... like do your radiator fans even work ??? or is it just more important engine related stuff.

Personaly I don't have as much time as I used to to **** with my car.... ****, I am still driving my RS cuz I havn't finished painting my Legacy BEATER yet! My car hates me more and more every salt covered day When I do get the RS back in the garage I can't wait to rip some wires apart and get the Emanage ultimate installed !
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Old 01-13-2009, 04:03 PM   #8
kaos200
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Quote:
Originally Posted by PhilSine View Post
MAP sensor = Manifold Absolute Pressure sensor = Barometric Pressure sensor.


The pressure in the manifold and barometric pressure are not the same, hence why there is an atmospheric pressure sensor (the one he has pointed to) and MAP sensors on LATER years (to which his car uses a MAF, as you know). The are not interchangeable terms if that is what you are saying.

Either way, my recommendation of switching to a wrx harness/ecu was premature. He would have to switch heads, and various other pieces to make it work. I do know that the emanage can be wired in in a couple ways (to manipulate air flow, or to directly control the injectors if I'm not mistaken) I would go for the most direct approach possible, and see where that gets you in terms of tunability. However this is still a bandaid and quite limiting in what it can do.
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Old 01-14-2009, 02:27 AM   #9
caged
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There is a map sensor on those early wrx's. If you disconnect the afm it will still drive using the map sensor in a limp home mode. They also use the map sensor as a referance for calculating timing and for boost cut.
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Old 01-14-2009, 08:31 AM   #10
VIsubi
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15 psi do you have internals or stock internals.
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Old 01-14-2009, 06:34 PM   #11
freeride
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what about getting the pressure sensor plugin for the emanage will that affect anything or at least help out?
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Old 01-14-2009, 09:51 PM   #12
PhilSine
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98 OBS-T, 91 Legacy SS

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Quote:
Originally Posted by IllNastyImpreza View Post
good luck with that ! I mean that unsarcasticly lol Out of curiousity I would like to know exactly WHAT needs to be swapped out from your remaining "old school" parts. ... like do your radiator fans even work ??? or is it just more important engine related stuff.

Personaly I don't have as much time as I used to to **** with my car.... ****, I am still driving my RS cuz I havn't finished painting my Legacy BEATER yet! My car hates me more and more every salt covered day When I do get the RS back in the garage I can't wait to rip some wires apart and get the Emanage ultimate installed !
I'm not entirely sure what to expect in total from the effort.

I'm building a hybrid STi engine using PnP'd WRX heads and I'll just figure things out from there. I'm not gonna go into detail about what I know to expect since there is a long list of changes and adaptations that need to be made. Almost nothing from my current build will carry over to the STi swap.
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