my dyno(no pic sorry)

Discussion in 'General Subaru Discussion' started by NMDAYTIME, Sep 30, 2008.

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  1. NMDAYTIME
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    NMDAYTIME Well-Known Member

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    ok i'm sorry right now my scanner isn't working right now. so i went to map yesterday at ten in the morning and i just got my car dynoed. well i have a 04 sti with a removed silencer(a non performance mod), drop in k&n filter(another non performance mod), an invidia bellmouth down pipe(catless), greddy v2 catback(thanks boomer), and a cell eliminator in the o2 sensor. i made 280 ft. lbs. of torque just before 4 grand, and for horsepower i put down 281. now i don't have a tune and eventually i plan a set of headers and an external up pipe. but until then i'm happy with what i have.
     
    NMDAYTIME, Sep 30, 2008
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  2. gc8
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    gc8 Well-Known Member

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    Tune not only for power...but for safety
     
    gc8, Sep 30, 2008
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  3. strangefamous
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    strangefamous Well-Known Member

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    You have those mods and you are boosting without a tune? :eek4: scary
     
    strangefamous, Sep 30, 2008
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  4. Bullwinkle
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    Bullwinkle Well-Known Member

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    If I read that correct, you just dropped those mods in and tossed her on the dyno?

    If so, what you have is a time bomb. Tossing on performance exhaust with the stock ECU mapping is a good way to have a very poorly performing and undrivable car, and a good way to bust some ring-lands.
     
    Bullwinkle, Sep 30, 2008
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  5. strangefamous
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    strangefamous Well-Known Member

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    Aye. Schedule a tune with bullwinkle ASAP! dont boost until then either.
     
    strangefamous, Sep 30, 2008
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  6. NMDAYTIME
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    NMDAYTIME Well-Known Member

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    i've been like this for a good year now and i'm not lean i run on the slight rich side. yes i know i will get more power out of a tune. the mil eliminator is a resistor that makes your car run perfectly fine without cats hence, no time bomb
     
    NMDAYTIME, Sep 30, 2008
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  7. Bullwinkle
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    Bullwinkle Well-Known Member

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    ?? No mechanical CEL fix will change your ECU mapping to account for better flow or higher boost. But hey, do as you please.
     
    Bullwinkle, Sep 30, 2008
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  8. TSTRBOY2004
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    TSTRBOY2004 Well-Known Member

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    um.. you may want to research or think before talking about what or what wont hurt your car when it comes to tuning...
    :roll:

    ^the guy posting above me is probably the BEST openecu Tuner in this state and not only that has safely tuned many of the solid HP cars around here...
     
    TSTRBOY2004, Sep 30, 2008
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  9. gc8
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    gc8 Well-Known Member

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    ....tick tick tick.....
     
    gc8, Sep 30, 2008
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  10. NMDAYTIME
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    NMDAYTIME Well-Known Member

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    NMDAYTIME, Oct 1, 2008
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  11. ShortytheFirefighter
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    ShortytheFirefighter Pokemans. I has none. Staff Member

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    Anyone want to start an over/under as to how long the motor lasts? I'll go with 6 months....

    Mind if I ask how you know you're running on the rich side? And it's been said before, but I'll say it again. The MIL eliminator only mimics the signal from the o2 sensor. It has nothing to do with controlling the ECU signals or making your car run better. All it's going to do is prevent you from getting a CEL due to the lack of cats. Just the fact that you think you're going to be ok doing that shows a serious lack of knowledge on what makes your car work. You'd be well advised to listen to the other guys who are trying to give you advice, unless you like doing complete motor replacements. I'd be scared to look at the condition of your pistons right now, especially if you've been like that for a year.
     
    ShortytheFirefighter, Oct 1, 2008
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  12. retreif
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    retreif Well-Known Member

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    Doesn't make your car run any better or worse, just stops the check engine light.
     
    retreif, Oct 1, 2008
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  13. gc8
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    gc8 Well-Known Member

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    Where in there does it say that it makes your car run fine with the modifications that you've done to it...?
     
    gc8, Oct 1, 2008
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  14. Scuba Steve
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    Scuba Steve Well-Known Member

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    Let's not beat him up over this....hopefully he'll simply take away a lesson that his car should get tuned asap.
     
    Scuba Steve, Oct 1, 2008
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  15. LASERBLUE135
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    LASERBLUE135 Well-Known Member

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    I don't know crap about STI's, but with a decent A/F ratio...why would this car blow up? I didn't read that he upped boost either. Somebody explain this to me? thanks.

    EDIT: he's got a K&N filter and a catless exhaust and the car will blow??? really ????
     
    LASERBLUE135, Oct 1, 2008
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  16. idget
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    idget Want to pokéman? PM ShortytheFirefighter Staff Member

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    Do the 04-05 STi's have the same ol/cl delay as the 06+STI and 03+ wrx (or was it 04+)?

    Either way, you'll benefit greatly with EM
     
    idget, Oct 1, 2008
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  17. idget
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    idget Want to pokéman? PM ShortytheFirefighter Staff Member

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    Starting in 04ish, new EPA regulations mandated tighter fueling restrictions. The STi was the exempt model in the line-up.

    To meet these restrictions, Subaru chose to implement some changes to open and closed loop fueling. Basically, 04+ turbo models (excluding the 04-05 STi. Not sure about the 06+ STI, but I believe regulations changed again and the ecu definitely changed to 32 bit in 07) exhibit a delay between the crossover from open loop to closed loop fueling. The car runs momentarily lean during this crossover point. Running exhaust and turbo mods magnify this gap since the stock ecu (although a dynamic knock system) is not able to fully compensate for the changes.

    Lean = detonation = bye bye pistons.
     
    idget, Oct 1, 2008
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  18. Bullwinkle
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    Bullwinkle Well-Known Member

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    Yeah, they still have the OL/CL delay.

    Well, the primary cause for concern would be the fueling delay. The OL/CL delay causes the car to see stoich AFR's all the way up until around 4k RPM. Obviously, this is bad.

    In addition, the stock fuel mapping is very rich stock. By adding those modes, he is increasing power, so he is "off the end" of both the fuel and timing maps. This causes the car to run very rich and run very low timing. Obviously, this is the opposite of what you would want to do (tuners typically increase timing if you add fuel).

    In addition to all of that mess, the stock mapping has load (ie; torque) limits on when it will pull timing due to knock as well as it's learning knock ranges.

    When these load limits are exceeded, the stock ECU will simply not learn to pull timing due to knock, and in extreme cases, not even pull timing during a WOT run when the car is knocking.
     
    Bullwinkle, Oct 1, 2008
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  19. idget
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    idget Want to pokéman? PM ShortytheFirefighter Staff Member

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    I suppose I should qualify this...

    When you add intake/exhaust mods, your ECU sees different values than what it expects. So long as these values are within a certain parameter (decided by SOA engineers or your tuner, and based on fueling, timing, load, etc), your car will run OK. However, once these boundaries are exceeded, the ECU works to return these values back to a manageable and safe state. These boundaries, as well as the degree to which the ECU will pull timing once these boundaries are exceeded, can be manipulated by a tuner. The stock parameters, however, have it's limits, and these limits can be exceeded (allowing your car to knock). Each tuner has their own "style," as the point at which to set these values can be based on several theories.

    Drive the car for a little while longer and let your ECU "get used" to your mods. Datalog while you're at it. Report back with IAM, g/sec, total timing, timing advance values. I'm gonna go out on a limb and say that in a week or so, it's not gonna be your butt-dyno getting used to your car, but your ecu getting used to your mods and trying to return to homeostasis.
     
    idget, Oct 1, 2008
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  20. boomer
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    boomer Well-Known Member

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    Tossed a Stage 2 base map on Nicks car tonight. Pulled a few logs and they looked pretty good. Only pulled timing at low rpm/high load situations. He could definitely use a more experienced tuner to take a look at it but he should be much safer with at least a "safe" base map.
     
    boomer, Oct 5, 2008
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