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3.4L supercharger

Discussion in '1st Gen. Tacomas (1995-2004)' started by CHMM, Sep 14, 2019.

  1. Nov 7, 2019 at 7:18 PM
    #881
    Shortman5

    Shortman5 Well-Known Member

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    What’s your reasoning behind being able to bypass the S/C? IMO it would just be making it overly complicated for no reason.
    EDIT: never mind. I actually read your response instead of glazing over.


    I really want to do this as well. But funds don’t allow at the moment.

    *I still need to add a traction bar to beef up the rear
    *factory height in rear and .5” lower up front.
    *get smaller tires. Hopefully saving 15-18lbs on each tire/wheel will help get
    some power back.
    *JBA Headers/Better exhaust hopefully freeing up back pressure and dropping boost. Then adding a 2.1.


    I’ve also been wondering how much gain you’d get by tapping the manifold after the rotors and spraying water/meth. I’ve been told it’s more efficient at bringing down temps that way

    EDIT: I’m also curious what makes heat and a Roots Supercharger inefficient. The PSI or the speed the rotors are spinning?
     
  2. Nov 7, 2019 at 7:22 PM
    #882
    Dalandser

    Dalandser ¡Me Gustan Las Tacos-mas!

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    The unit heats up and can’t send cool dense air into the engine. But maybe you’re asking why it heats up - it’s rpm dependent so added friction.
     
  3. Nov 7, 2019 at 7:50 PM
    #883
    JasonLee

    JasonLee Hello? I'm a truck.

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    it sounds like you don’t know how open/closed loop works.

    I recommend reading the two URD guides several times from the depths of your rabbit hole. Then you’ll have a better handle of how to move forward with digging your hole deeper and continuing to race minivans while holding your Starbucks.


    supercharger doesn’t know about open loop or closed loop. That’s all on the ECU.
     
    kigmob likes this.
  4. Nov 7, 2019 at 8:00 PM
    #884
    eon_blue

    eon_blue Most Improved Member

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    Yes the supercharger has no say on open/closed loop, from my understanding the ECU stays in closed loop until the a certain throttle position or RPM range is achieved. Which is why part throttle usually results in continued closed loop operation unless it's held for a certain amount of time and then the ECU transitions into open loop.
    WOT is almost instantly open loop which is why the AFR will show richer readings right away.

    I think what it sounds like we're after is getting the ECU to go into open loop more quickly during part throttle, or at least get the 7th injector/meth system/larger injectors to add fuel regardless to enrichen the AFR even in closed loop.

    But like someone else said earlier, even if you add fuel in closed loop the ECU will see it and fight to adjust it back to 14.7 or close to it. I know for a fact that is where my pinging issues still are - closed loop/part throttle boost
     
    CHMM[OP] and 1997tacomav6 like this.
  5. Nov 7, 2019 at 8:01 PM
    #885
    Shortman5

    Shortman5 Well-Known Member

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    the URD guides are fine but take some of the tuning stuff with a grain of salt. Not only did they not help me they made things worse. Not that they’re wrong but they don’t go into enough detail and omit some information that can you confused.
     
    kigmob likes this.
  6. Nov 7, 2019 at 8:12 PM
    #886
    1997tacomav6

    1997tacomav6 V6 5sp,RegCab,TRD Supercharger,Haltech,meth, 750k

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    V6 5sp,RegCab,TRD Supercharger, 1.9” pulley, methanol injected Haltech ECU, AC TRD supercharger,(MUST DO) TRD supercharger ported, every 125,000- 150,000 needs rebuild Projector headlights HID 5 speed manual Amsoil for all drive train Smaller 2” pulley, (MUST DO) 2004 DESNO fuel injectors, zero ping ping, 2004 side door mirrors Dick Cepek Rims, Michelin tires LTX, ( that last 100,000 miles) Now running Dynopro ATM mud and snow tires KN cold air intake Cat back exhaust with ss exhaust tip, Raised exhaust tail pipe to 2" below body line Optima*dry cell battery,red top Alpine sirius radio, 200 watt amp, focal is165 split door pod speakers Focal door speakers Subwoffer behind seat Viper alarm, Electric Locks Dark tinted windows, bucket seats corbeau lg1 Tacoma Rubber floor mats TRD fender extenders, Bilstien shocks, King shocks nerf bars, add a leaf for rear springs trailer iv hitch, electric brake control, Drilled slotted brakes, High carbon steel (MUST DO) EBS green stuff 7000 series pads(MUST DO) TRD engine oil cap TRD stick shift, Marlin crawl shift kit. Rear sliding window 2002 4Runner functional hood scoop cut into Tacoma hood, 4Runner dual overhead map light Gentex Auto dim + Compass + Temp, garage,rearview mirror Snow Methonal kit stage 2 Custom 3 core aluminum radiator Linex bed liner Haltech stand alone ECU, Intake supercharger gauge. Stainless steel brake lines, Custom leather wrapped steering wheel,
    I’m well aware of that
     
  7. Nov 7, 2019 at 8:16 PM
    #887
    Shortman5

    Shortman5 Well-Known Member

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    To answer your question there’s nothing on the market that can make it switch to open loop. Split Second did something like that early on but it must have had some issues because it hasn’t been available for some time.
     
    CHMM[OP] and eon_blue like this.
  8. Nov 7, 2019 at 8:49 PM
    #888
    JasonLee

    JasonLee Hello? I'm a truck.

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    Yes there is. Standalone ECU.
     
    TMFF and BlackSportD like this.
  9. Nov 7, 2019 at 8:51 PM
    #889
    Shortman5

    Shortman5 Well-Known Member

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    I was going to mention that but more along the lines of “not road legal, cost thousands”
     
    JasonLee[QUOTED] likes this.
  10. Nov 7, 2019 at 9:39 PM
    #890
    CHMM

    CHMM [OP] GTO

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    Sounds like we gotta keep the RPMs up enough, downshift and floor it. It’s not passenger friendly but it is my work truck. And it can be driven “normal” in closed loop.
     
    eon_blue[QUOTED] likes this.
  11. Nov 8, 2019 at 4:03 AM
    #891
    Shortman5

    Shortman5 Well-Known Member

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    If you have to floor it and keep the RPMs up at all you can not drive normal in closed loop.

    Point is your going to have to drive around that area we’ve been talking about all this time. The area you NEED part throttle enrichment for.
     
    1997tacomav6 likes this.
  12. Nov 8, 2019 at 7:52 AM
    #892
    BlackSportD

    BlackSportD Well-Known Member

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    Icon/TC Mid travel, TRD S/C, PNP Greddy EMU, 625cc injectors, 2.2 pulley, Hayden tranny cooler, AEM wideband, TRD boost gauge.
    Yeah, I'm not known for having an economy of words haha.

    I really thought some custom arduino setup would be required, but with the EMU I think I can pull off the transitional setup without added electronics.

    Currently I use the on/off type setup now for mountain passes where just keeping up with traffic puts the truck in partial throttle boost, which in turn richens the fuel (I have the split second in conjunction with the EMU to enrichen closed loop boost) and also pulls timing- so MPGs is just crapping out the tailpipe and EGTs going up for no good reason. I have a pic somewhere from another thread where I got a custom switch that has "S/C Bypass" on it. I think only one other member has followed suit and setup the bypass on their setup too, I think so that they can run 87 octane when they want to.
     
  13. Nov 8, 2019 at 8:42 AM
    #893
    Shortman5

    Shortman5 Well-Known Member

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    I was watching some “supercharger sound” videos on YouTube last night. Now I want a V8 so I can run a ported M112.
     
  14. Nov 8, 2019 at 9:00 AM
    #894
    cruiserguy

    cruiserguy Well-Known Member

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    :rofl::rofl:ain't that the truth!
     
  15. Nov 8, 2019 at 11:10 AM
    #895
    mechanicjon

    mechanicjon They call me "Jonny Stubs"

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    Just a thought. The ECU adjust fuel by engine temps. What would happen if you placed a resistor to ground on the water temp connection. Eliminate the water temp sensor and trick the ecu to thinking the temps are 100 degrees.
     
  16. Nov 8, 2019 at 11:12 AM
    #896
    mechanicjon

    mechanicjon They call me "Jonny Stubs"

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    I have an URD AFR calibrator to run on mine. We'll see how that does.
     
    1997tacomav6 and CHMM[OP] like this.
  17. Nov 8, 2019 at 11:52 AM
    #897
    Shortman5

    Shortman5 Well-Known Member

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    this works quite well. But in my experience it won’t do much for ping in closed loop. For me it’s almost entirely timing related.
     
    kigmob likes this.
  18. Nov 8, 2019 at 11:56 AM
    #898
    TMFF

    TMFF Well-Known Member

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    Stuff and junk and things...
    The FIC can do what you are wanting. BUT.... it will be something your always chasing since the factory ECU is always wanting to trim that particular part of the rpm/load/tps range.



    Ebay is full of garbage products that do just that. Not recommended.
     
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  19. Nov 8, 2019 at 12:16 PM
    #899
    Shortman5

    Shortman5 Well-Known Member

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    I’m sure timing is different in warm up open loop as well.
     
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  20. Nov 8, 2019 at 12:58 PM
    #900
    BlackSportD

    BlackSportD Well-Known Member

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    Icon/TC Mid travel, TRD S/C, PNP Greddy EMU, 625cc injectors, 2.2 pulley, Hayden tranny cooler, AEM wideband, TRD boost gauge.
    If you tune the FIC correctly its the opposite, the truck tunes it for you. You can enrichen closed loop like a boss with the FIC, it skews the o2 signal so as far as the truck is concerned you are running stoich 14.7:1 but you are actually running 11:1 or whatever it is you want.

    What is really neat is you can change the o2 tuning map to read in air fuel instead of some voltage number. You can also calibrate the aux input to take in A/F gauge data for data-logging.

    The Greddy EMU does not have this feature- if it did I would say hands down its the best piggyback every made... EVER. There was a very limited time Greddy made another box you would tie into the EMU to give it the o2 signal skewing capability but its super rare and pricey so I got the split second instead.

    A cool feature with the EMU is closed loop tuning via wideband input. You can map that it only works at certain TPS and load so it only works when the truck is in open loop- that way your WOT air fuel tune stays dead on.

    * Edit, I would love to take the EMU mappable 0-5v aux output and tie it into the split second (take the place of a rheostat output maybe) to then give the EMU a way of controlling the splic second's o2 skewing. Maybe one of these days.
     

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