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Great "Un-mod"

Discussion in '1st Gen. Tacomas (1995-2004)' started by Ritter, Sep 6, 2011.

  1. Sep 6, 2011 at 12:34 PM
    #1
    Ritter

    Ritter [OP] Well-Known Member

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    My G1 was hesitating at lower rpm and kept throwing a too rich CEL.
    I cleared it a few times but each time after a few days it returned.

    Could be a lot of things like failing MAF or 02 sensor, but before replacing either or both I replugged the 5" hole I put in my airbox- and viola, problem gone. Accelerates noticeably better and no CEL after a couple of weeks.

    I think it threw off the AFR and the ECU could not compensate, or, overcompensated. The Bosch ECU on my racecar (Porsche) has the ability to learn and adapt to a certain extent but any major changes require a remap. I think the Toyota would need the same.

    Maybe (maybe) there is more peak hp from this airbox mod but I think for everyday driving its of questionable value. As always YMMV.
     
  2. Sep 6, 2011 at 12:38 PM
    #2
    VirginiaBound

    VirginiaBound Whyareyoureadingthis?

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    So your thoughts are the deckplate mod hurt performance?
     
  3. Sep 6, 2011 at 12:45 PM
    #3
    Ritter

    Ritter [OP] Well-Known Member

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    In a word- yes.

    On older (pre-1999) air-cooled Porsches drilling holes in the airbox is a popular modification- as much for the sound (more) than any possible power gains or improved mileage. The Bosch DME (ECU) has an innate learning capability and seemed to handle these types of changes with little if any issue- not so sure about the ability of the one in the Toyota to do the same.
     
  4. Sep 6, 2011 at 12:49 PM
    #4
    VirginiaBound

    VirginiaBound Whyareyoureadingthis?

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    I opted for drilling a few holes rather than doing the deckplate, maybe someone else can chime in.

    It makes sense.
     
  5. Sep 6, 2011 at 12:50 PM
    #5
    steve o 77

    steve o 77 braaap

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    deckplate mod does not work on the 2nd gens. Here is proof lol.
     
  6. Sep 6, 2011 at 12:55 PM
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    VirginiaBound

    VirginiaBound Whyareyoureadingthis?

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    He said his G1, which I assume is the 2003?
     
  7. Sep 6, 2011 at 1:14 PM
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    Ritter

    Ritter [OP] Well-Known Member

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    Yes- Gen 1.
    It may work great on other trucks (Gen 1) but didn't on mine.
     
  8. Sep 6, 2011 at 1:45 PM
    #8
    StAndrew

    StAndrew Wait for it...

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    Chris4x4 had some dyno runs with ~6-8 peak hp gains. I dont think you will see much difference in the low to mid power range. Unless you drive your truck upwards of 5000 RPMs, not much gain will be noticed.
     
  9. Sep 6, 2011 at 1:49 PM
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    jberry813

    jberry813 The Mad Scientist

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    ...too much shit to list.
    After doing the deckplate did you reset the ECU? Pull the battery and step on the brake pedal for a few seconds.
    Once the curve is set on the ECU's it takes too long to adjust. Pulling the battery did the trick for me.

    EDIT: Also...I cleaned the MAF. Forgot there was 2 things I did at once. :eek:
     
  10. Sep 6, 2011 at 1:55 PM
    #10
    VirginiaBound

    VirginiaBound Whyareyoureadingthis?

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    Wait, you have to hit the brake pedal with it disconnected?

    I let it sit for thirty minutes unplugged for nothing? :eek:
     
  11. Sep 6, 2011 at 1:57 PM
    #11
    jberry813

    jberry813 The Mad Scientist

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    You can do either. I'm impatient, so I hit the brakes. Whatever left over juice in any capaciters will get discharged in a second.
     
  12. Sep 6, 2011 at 1:58 PM
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    G scott04

    G scott04 ...

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  13. Sep 6, 2011 at 1:58 PM
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    VirginiaBound

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    Oh I see, so I should be fine then. :D

    I figured it reset, my radio presets and trip meters were reset.
     
  14. Sep 6, 2011 at 2:01 PM
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    jberry813

    jberry813 The Mad Scientist

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    Yeah that works. The whole "30 minutes" is just so the caps discharge. If you just leave the key on and hold the brake pedal for a few seconds it has the same effect.
     
  15. Sep 6, 2011 at 2:07 PM
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    TanSR5x4

    TanSR5x4 Hold my beer and watch this

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    yeah i always leave my cap in the deck plate
     
  16. Sep 6, 2011 at 4:22 PM
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    steve o 77

    steve o 77 braaap

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    didn't see that:eek:

    Ive had zero problems with the deckplate in mine. Just better sound and more power when reving it out.
     
  17. Sep 6, 2011 at 4:25 PM
    #17
    JimBeam

    JimBeam BECAUSE INTERNETS!! Moderator

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    I've heard of a few people having issues here and there like this but typically it's attributed to the sealant used when putting the deckplate in the hole
     
  18. Sep 6, 2011 at 5:16 PM
    #18
    scocar

    scocar Scouting the perimeter for weakness

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    Back to square one after the 2001. So...
    I think most people have used a 4-inch plate, but you used a 5-inch. That is quite a bit more air coming in. Not sure what size the dyno results were from, but I assume 4-in. Maybe this is a factor in your case.
     
  19. Sep 6, 2011 at 7:33 PM
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    Ritter

    Ritter [OP] Well-Known Member

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    Maybe. I found a 5" diameter foam element that I stuck in the cutout to prevent any dirt from finding it's way in. It's wall size is 0.5" so effectively it's about 4". Regardless, with it or without the performance seems to be the same.

    My point is ( I think) that if there is a gain in peak hp, it may be at the expense of low or mid range power. For the Gen 1 here in Nassau it's all low/mid range so not a good trade off for me.
     
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