Question about 2005 Subaru Baja

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I have a 2001 Forester S with an hho mod that will work best if the timing is retarded from standard -- how much to be determined. I've tried altering the IAT by many degrees (all the way up to tripping the code at 400 F) and that seems to have no affect on the advance whatever. Should I try putting an offset on the TPS resistance? Or do I just ultimately have to buy a unichip? Hope I can do this experiment more economically than that. Thanks for any help! David

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  • hho_systems Jun 01, 2010

    I have a 2001 Forester S with an hho mod that will work best if the timing is retarded from standard -- how much to be determined. I've tried altering the IAT by many degrees (all the way up to tripping the code at 400 F) and that seems to have no affect on the advance whatever. Should I try putting an offset on the TPS resistance? Or do I just ultimately have to buy a unichip? Hope I can do this experiment more economically than that. Thanks for any help! David

  • hho_systems Jun 02, 2010

    Yes, I'm sure you're correct. But one tends to grasp at straws, rather than spend money, these days. Thanks!

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  • Subaru Master
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There is no way to affect timing without having the EPROM reprogrammed, timing tables are set and in the EPROM (Electronic programable read only memory) of the PCM, so no fooling with the TPS will change the timing. Contact a performance chip maker, u will need to fill out a form of all the mods u have made and then send your computer in and they will write new programming onto the EPROM

Posted on May 30, 2010

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  • hho_systems May 30, 2010

    The problem with that is, there's really no way right now to know what ****** or advance number will work best. I'm theorizing that the timing should be retarded ~ 10 degrees (as an offset from the ECM value) but that's a back-of-the-envelope guess. Adjusting, testing, and adjusting is how I'd go about doing this -- should be relatively fast. Maybe a whole new timing map would need to be generated, rather than using one simple offset. But sending the ECM off to a programmer multiple times is not practicable. Buying a Unichip would enable adjustments on the fly, then, when an optimum value is known, perhaps having the ECM re-programmed (once) would be a solution. All this is pretty elaborate -- certainly is a nuisance for mileage researchers that ECMs have become so intractable.



    Thanks for your help. Am I on the right track?

    David

  • yadayada
    yadayada May 30, 2010

    U supply the mods u have done to the chip company and they can decide that, trust me have been doing this since the very 1st electronically controlled engine fuel management systems came out.

  • hho_systems May 31, 2010

    Would you like to mention a specific company?

  • yadayada
    yadayada May 31, 2010

    No companies come to mind, i suggest u joining a Subaru owners forum or club on the internet ask about it, 1000's of other members, someone will know a company that does this, here is one such web site.



    http://forums.nasioc.com/

  • yadayada
    yadayada Jun 01, 2010

    You can reject my advice but the info is correct.

  • hho_systems Jun 02, 2010

    Yes, I'm sure you're right, but sometimes I grasp at straws when the alternative involves spending money. Thanks!

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  • Master
  • 1,857 Answers

The IAT is just a temp sensor. If the computer thinks its at 400 degrees the injectors will be shutting off, Not increaseing pulse with. Also if the PCM thinks the engine is hottter than normal it will reduce fuel and if it thinks its overheating it can reduce the fuel to the point the car will die. When you mod a IAT or ECT you need to have a higher resistance, not a lower resistance to increase fuel. If you mess with the TPS which is just a throttle sensor the car will idle higher or lower depending on what you do so thats not an option either. Now if this car is computer controlled for the timing there will be no way to change the timing, even if the distributor does rotate. Look on the emission label under the hood. If it doesnt give you a spec for timing then its not adjustabe. If you ****** the timing the car will be gutless at accel. If you advance the timing it will be gutless at higher RPMS. Since we don't knowwhat your issues are I can't give you a direction to go. Not knowing what the mods you did exactly also leaves me with my hands tied.

Personally i would put this back to stock before you toast the catalytic convrter and have to replace it at a cost of several hundred dollars and end up setting a code for it.

Posted on Jun 01, 2010

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