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2G EVO III IM EGR port as a secondary boost source?

Posted by ohlegend, Apr 17, 2019

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  1. ohlegend

    ohlegend Proven Member

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    I'm just wondering if it is possible to use the egr location on the EvoIII IM as a boost source.
    I have an AEM hg/psi gauge hooked up to the fuel pressure regulator line and I don't want to T it off again.
    My second gauge is a EVO IX "sport gauge" which measures boost in BAR. I would like this one to be accurate as well.

    And before you ask why I need 2 boost gauges. I just like the factory mitsu logoed gauges for ascetics :)
     

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  2. miguelmcv

    miguelmcv Proven Member

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    Yes you can, there is no problem with that.
     

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  3. Mello

    Mello Proven Member

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    You can also tee of the brake booster line as another option for a boost source. I have my MAP connected this way. Only had to purchase a straight thru 3/8 fitting (I think) with an 1/8 NPT out the side.
     
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  4. ATF 2GTalon

    ATF 2GTalon Proven Member

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    Do you mean the EGR hole in the intake manifold that is an M16 thread size? That port is where exhaust gases are so you won't be measuring boost at all, more likely exhaust back pressure.
     

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  5. ThunderChild

    ThunderChild Supporting VIP

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    I did the same with my two maps, one for boost gauge, one for ecmlink.
    The egr port should be fine as well, I thinking a block-off plate and 1/8 npt port?
     

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  6. ATF 2GTalon

    ATF 2GTalon Proven Member

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    I think you guys are missing the fact that he said he's running the Evo3 intake manifold. The EGR hole is only the exhaust side.
     

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  7. miguelmcv

    miguelmcv Proven Member

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    Big thanks to ATF who point that out( EVO3 IM).
    The EVO 3 doesn’t have intake source for the EGR, it only has the exhaust port, but never the intake source.

    You can’t hook a vacuum line to it, it will never work.
     

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  8. EVLGSX

    EVLGSX Proven Member

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    This is what I did. Kinda lazy but it works great. You will need a 90* pneumatic drill and a stubby bit to do this.





    20180503_171152.jpg 20180503_170232.jpg 20180503_171137.jpg
     

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  9. Mello

    Mello Proven Member

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    Here's a pic of what I did. Worked pretty good. Undid the booster hose, unscrewed the nipple, screwed on the three-way fitting, then put the nipple back & installed my MAP. Took all of about 10 mins.
    118.JPG
     
  10. ThunderChild

    ThunderChild Supporting VIP

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    I'm not familiar with the evo3 manifold, but how exactly does it transfer any exhaust gas to the intake manifold? A standard dsm intake manifold has the two ports as we know, one goes to the exhaust and the other to the intake manifold, valve in-between. Educate me on the evo3's difference please!
     

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  11. EVLGSX

    EVLGSX Proven Member

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    Are those threads npt or bspt?
     

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  12. Mello

    Mello Proven Member

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    It's been quite a while when I did this but I believe the booster nipple threads were NPT. Removed the nipple & took it with me to HD to fit check. Anyway thats what I purchased & everything finger threaded easily with about 1/2 turn to final torque. No teflon tape & no boost leaks, no problems after many years.

    Edit: Oops, just went & looked, "a little teflon tape" & no leaks. Also it looks like the fitting is 1/8 NPT female x 1/8 NPT male straight thru & 1/16 NPT male the MAP is threaded in.
     
    Last edited: Apr 18, 2019
  13. DSMPT

    DSMPT Proven Member

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    @ThunderChild
    JDM Eclipse/EVO don't have egr and JDM intake manifolds don't have holes for egr, even JDM 2g Eclipse doesn't have a hole for MDP sensor.
    That hole on EVO3 manifold is for secondary air system which is a part of Mitsubishi anti lag. Why only EVO3 intake manifold has is because of that year's WRC regulation. WRC claimed that marketed vehicles must have had it. So Mitsubishi just put it on marketed EVO3s only for WRC but they never activated it on marketed vehicles.
     

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  14. Mello

    Mello Proven Member

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    From what I understand only the UK & JDM market EVO's came with the SAS & ALS systems.
     
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  15. ThunderChild

    ThunderChild Supporting VIP

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    Interesting what companies did to get their cars legal for wrc...reminds me if the Top Gear: Audi vs Lancia episode haha. Thanks for the info @DSMPT !
     

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  16. DSMPT

    DSMPT Proven Member

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    I believe so, too.

    It is opposite. When the gas pedal is off, the ECU would send the fresh air from intake side to exhaust manifold. And also it would keep sending some amount of fresh gas and cut the ignition. So when the fresh air gets in the exhaust manifold, the fresh gas would be burnt at pre turbo by the heat of exhaust manifold. then that spins the turbine. It is said it would spin the turbine like when the engine speed is at 2000-3000rpm. and this would allow the 16g to keep 4~5psi for a few seconds after the gas pedal gets off.

    Yes it is interesting. In google you can find many pics of JDM EVO 4-9 that have 2 pipes with banjo fittings on exhaust manifold, that is the SAS.
     

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  17. ohlegend

    ohlegend Proven Member

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    Thanks for the responses everone! @Mello That is probably the best idea. Is that just a 1/8 npt T fitting? (Well 1 Male and 2 female ports)
    Also - Do you guys see any issue with tying both boost gauges to the brake booster line? One line for the AEM gauge, one for the BAR gauge, and one for the booster?
     

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  18. Mello

    Mello Proven Member

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    No I did not see any issues. In fact it seemed best. The booster nipple ID & tap size are larger than the nipples for the other ports on the IM & the tee for my MAP is very close to the plenum cavity making this source perfom with better consistancy & less pressure pulsing showing up in my logs.
     

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