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Thread: loosing power on higher gear?

  1. #1
    Forum Member Grease Monkey
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    Default loosing power on higher gear?

    guy's,
    im having some problem here. Hope u guys can help.

    just a brief thru my spec. ori 1.6l engine, bolt on turbo. IHI VF10, 2.5" downpipe. 2.5" piping till 2" inlet straight flow exhaust. Control by emanage. Auto gearbox. Boost 0.9bar

    from standstill, (gear select manually) from 1st gear -2nd gear, my car does pull hard. Can see the speed climb fast. But once in 3rd gear, the car dun pull hard anymore. The speed wasnt climb that fast also. But boost still maitain though.

    on cruising (120-130kmh), D gear selection, if i tekan, the boost reach 0.9bar with ease but the car speed wasnt climb that fast.

    What can be wrong? If Gb slip, i would have problem with 1st-2nd gear already. Dynoed 155whp @ 5800rpm and 200nm wtq @ 4500rpm. My suspect could be having low torque.

    But the catch is here. It only happen after i dyno tune my car. last time whn i havent tune my car, i dun have this problem. I was told be4 tune im running very lean.

    Any input?

  2. #2
    Junior Member Too Much Toyota oldcorollas's Avatar
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    Default Re: loosing power on higher gear?

    what is the difference in ratio between 2nd and 3rd?

    maybe timing is incorrect? what are the AFR's now?
    "I'm a Teaspoon, not a mechanic"
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  3. #3
    Forum Member Grease Monkey
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    Default Re: loosing power on higher gear?

    hm... finding the ratio between 2nd and 3rd gear is difficult. Let me google around and see if there is any luck. As for AFR, here it is...


  4. #4
    Junior Member Too Much Toyota oldcorollas's Avatar
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    Default Re: loosing power on higher gear?

    well, it's running fairly rich now.. what about timing?

    maybe the combination of low timing and lean before was better for power than now, with a better mixture.. ie, timing needs altering.
    "I'm a Teaspoon, not a mechanic"
    "There is hardly anything in the world that a man can not make a little worse and sell a little cheaper" - John Ruskin (1819 - 1900)

    AU$TRALIA... come and stay and PAY and PAY!!! The moral high horse of the world!

  5. #5
    i wrote the Automotive Encyclopaedia roadsailing's Avatar
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    Default Re: loosing power on higher gear?

    OC, do you have a babelfish in your ear? cause i can't even seet he question there, unless its "cars dont accelerate as quickly in high gears as in low gears" which is more a statement.
    like to drift? live in victoria?
    www.vicdrift.com

    now targeting: targets

    formerly shinybluesteel

  6. #6
    serial biochemist Automotive Encyclopaedia
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    Default Re: loosing power on higher gear?

    Could the clutch be slipping a little?
    your rep rating is not a reflection of your worth to the community

    Quote Originally Posted by H1TMAN
    wtf? I want to do track racing, and f#@k you...
    that's very flattering but no thanks.

  7. #7
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    Default Re: loosing power on higher gear?

    ok, my bad,

    "cars dont accelerate as quickly in high gears as in low gears" is my problem

  8. #8
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    Default Re: loosing power on higher gear?

    Quote Originally Posted by oldcorollas
    well, it's running fairly rich now.. what about timing?

    maybe the combination of low timing and lean before was better for power than now, with a better mixture.. ie, timing needs altering.

    i dont have a laptop to access into my emanage now. hence i wasnt sure about the timing.

    so you do think its more on tuning issue instead of hardware?

  9. #9
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    Default Re: loosing power on higher gear?

    Quote Originally Posted by mtp_69_i
    Could the clutch be slipping a little?
    bro, wun the slip clutch be more obvious on lower gear sprint?

  10. #10
    serial biochemist Automotive Encyclopaedia
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    Default Re: loosing power on higher gear?

    Quote Originally Posted by normality78
    bro, wun the slip clutch be more obvious on lower gear sprint?
    Nah matey, a slipping clutch gives itself away under load. If you're trying to accelerate hard in 3rd or 4th there is much more load on the clutch than when you do it in 1st or 2nd.

    Try this;

    take off slowly and change into 4th at very low speed (like 25km/hr). Once in 4th mash the accelerator and see what the engine does, if the clutch is slipping the motor should start to increase in revs without actually moving the car any faster.
    your rep rating is not a reflection of your worth to the community

    Quote Originally Posted by H1TMAN
    wtf? I want to do track racing, and f#@k you...
    that's very flattering but no thanks.

  11. #11
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    Default Re: loosing power on higher gear?

    Quote Originally Posted by mtp_69_i
    Nah matey, a slipping clutch gives itself away under load. If you're trying to accelerate hard in 3rd or 4th there is much more load on the clutch than when you do it in 1st or 2nd.

    Try this;

    take off slowly and change into 4th at very low speed (like 25km/hr). Once in 4th mash the accelerator and see what the engine does, if the clutch is slipping the motor should start to increase in revs without actually moving the car any faster.

    ok, will it later...

  12. #12
    Junior Member Too Much Toyota oldcorollas's Avatar
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    Default Re: loosing power on higher gear?

    myp_69_i, the gearbox is auto... the convertor might be slipping more but...

    SBS.. yes.. i do call it 3 years practice ..

    as for hardware vs tuning...
    in higher gears it will be slower than lower gears, because of the ratios.
    if it feels slower now in higher gear, after it was tuned then either

    a) it is making more torque everywhere, so you don't feel the "push".... ie it is faster but doesn't feel as fast..

    or b), after richening the mixture up, the tuner did not put in enough timing.. so it is actually slower... or they put in too much fuel... etc etc...

    did you race it on 1/4 mile before the tune? (to have something to compare to?)
    in other words... is it actualyl slower, or just feels slower?
    "I'm a Teaspoon, not a mechanic"
    "There is hardly anything in the world that a man can not make a little worse and sell a little cheaper" - John Ruskin (1819 - 1900)

    AU$TRALIA... come and stay and PAY and PAY!!! The moral high horse of the world!

  13. #13
    serial biochemist Automotive Encyclopaedia
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    Default Re: loosing power on higher gear?

    sh!t sorry about missing that. I totally didn't see it in the first post.
    your rep rating is not a reflection of your worth to the community

    Quote Originally Posted by H1TMAN
    wtf? I want to do track racing, and f#@k you...
    that's very flattering but no thanks.

  14. #14
    Fuel Economy Warrior Carport Converter Vios-GT_07's Avatar
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    Default Re: loosing power on higher gear?

    me thinks his 3rd gear ratio is far from the 2nd gear ratio?

    either that or the expectation that 3rd gear will have the same acceleration as 2nd gear needs to be toned down?

    i'd have thought that if the torque converter was slipping, under full boost in 3rd gear the revs would jump but the speedometer wouldn't move very much?
    Research has shown child in front seat causes accidents, accident in back seat causes child

  15. #15
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    Default Re: loosing power on higher gear?

    Quote Originally Posted by oldcorollas
    myp_69_i, the gearbox is auto... the convertor might be slipping more but...

    SBS.. yes.. i do call it 3 years practice ..

    as for hardware vs tuning...
    in higher gears it will be slower than lower gears, because of the ratios.
    if it feels slower now in higher gear, after it was tuned then either

    a) it is making more torque everywhere, so you don't feel the "push".... ie it is faster but doesn't feel as fast..

    or b), after richening the mixture up, the tuner did not put in enough timing.. so it is actually slower... or they put in too much fuel... etc etc...

    did you race it on 1/4 mile before the tune? (to have something to compare to?)
    in other words... is it actualyl slower, or just feels slower?
    nop. I didnt race 1/4 mile. normally just some street drag among friends and occasionally some high speed when travelling long distance.

    its not about the feel though. due to im having auto, i do aware there isnt much G i can feel so normally i do pay notice on speed.

    perhaps i should get it retune and see how it goes.

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