Astra GSI's flywheel heavy??
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Thread: Astra GSI's flywheel heavy??

  1. #1
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    Question Astra GSI's flywheel heavy??

    Is the flywheel of the GSI considered heavy?? I find the throttle response rather weak and it feels like the flywheel is on the heavy side.
    Control is nothing without Power.........

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  3. #2
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    er... yup

    you've got a 9.4kg flywheel, 2.5kg clutch, and a 20kgish crank.

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    i think it shares the same mundo pot flywheel as the cav and calibra, so yes its f-cking heavy. If you swapped the clutch and flywheel from a pre 93 XE that would be a start.

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    Hmm... lightened flywheel and throttle body mod... good for 0.5 seconds off the 0-60.

  6. #5
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    no wonder!! Could that also cause the flatspot whereby, if u don't dump enough revs before engaging the clutch, the damn thing would get this flatspot at about 1800-2000rpm. It only happens when i floor it suddenly while moving off gently (engage at bout 1500rpm)

    I can coast to a low 1300 rpm and nail the gas, the response is good. i was thinking that when coasting, there is enough momentum to not get that flatspot problem.

    Tim, i just peeked into the throttle body. No wedge there, which means no free modification for me
    Control is nothing without Power.........

  7. #6
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    I think that's a feature of the later engines, yours a 94?

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    mines a late 93, dizzyless one.

    what bout the flatspot problem, u experienced it before?? any ideas whats causing it?? I find it weird as to why its worse with the aircon on
    Control is nothing without Power.........

  9. #8
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    because the air con pump is sapping mechanical force from the engine.

    Ever noticed how the engine tone drops slightly when you switch on your full beam, or the heated rear window?

    more strain on battery, more strain on altenator, more power needed to turn the altenator, engine labours.

  10. #9
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    I haven't really driven my car enough to experience the less obvious quirks.

    Tomorrow it's having....

    NEW Cambelt
    NEW CV boots
    NEW Speedo cable
    NEW Temp sender
    Power steering fluid changed
    Brakes serviced.

    Think that's it for now.

    Hopefully over the weekend I can put in some road time.

    Looks promising.

    If the Wedge thing is there, it's coming off.. I think.

  11. #10
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    Point accepted oddball, but the freakin thing does this: it responds when u put ur foot down, but as soon as the tacho is showing 1800-2000rpm, it feels flat (as if there was a dip in torque curve) . After that it all comes in a rush all the way to redline.

    shouldn't it have that flatspot everytime i on the aircon?? but mine does it intermittently.
    Control is nothing without Power.........

  12. #11
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    Sounds like it needs a good service.

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    I've gotten several mechs and even the agent look at it. Done a hell lot, but still it does it.

    try this tim, in 3rd gear, slow down to about 30km/h or less (tacho reading less than 1500rpm) . Accelerate from there (dont floor it) once the needle reaches bout 1800-2000rpm there'll be a dip in power (flatspot) before clearing up and off u go.

    I'm seriously thinking that its a character of either the ECU or the XE.
    Control is nothing without Power.........

  14. #13
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    Have you had the rotor arm, dizzy, leads and plugs looked at?

    As with everything there are exceptions to the rule.

    If you had a 57i that might explain it.

    Rule out the logical then look at the illogical.

  15. #14
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    mines a dizzyless mate. replaced the DIS unit few months back because it was misfiring. Leads look fine. The originals are f**king expensive. Can't get magnecore ones, they don't have for the GSI.

    no 57i here. just a nice panel filter and removed the intake resonator box (behind the bumper) De-cat exhaust. I'm gettin some new plugs tomorrow.
    Control is nothing without Power.........

  16. #15
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    hangon, why do you expect there to be a mass of power at 1800rpm anyway ? thats only 900rpm past tickover.

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    I think it's not so much a lack of power as a feeling that the car has almost stopped for a split second.

    I got this when I put the 57i on.

  18. #17
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    COuld your exhaust and air filter mods be causing too much/less back pressure, and then causing a slight flat spot through pressure? Thought about the breather mod?
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    Originally posted by Animal
    er... yup

    you've got a 9.4kg flywheel, 2.5kg clutch, and a 20kgish crank.
    heard there r 2 setups for Mk2s GTE...like an earlier lighter version...and a later heavier 1....

    when were these heavier 1s introduced and how much heavier compared to the earlier 1s...

    thanx...
    four...quatre...vier...patru...quattro...

  20. #19
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    thats true oddball, i ain't expecting G-force kinda power but the thing is that, it doesn't do it all the time (which usually means something ain't right) at times it goes real well (no holes in the powerband) from tickover to redline.

    It isn't the kind of lack of power when u floor in it 5th.

    when it does happen, it feels as if i've released the gas pedal before reapplying it again.

    previous owner de-cat it. yup done the breather mod. Got rid of my stalling.
    Control is nothing without Power.........

  21. #20
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    Stalling?

    Ouch.. that engine of yours is one sick puppy

  22. #21
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    lmao

    not anymore dude!! the breather mod fixed it and got rid of the kangaroo inside.
    Control is nothing without Power.........

  23. #22
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    Why was it kangarooing with no 57i?

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    Reset the ecu for an hour m8.

  25. #24
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    Originally posted by VEGA
    heard there r 2 setups for Mk2s GTE...like an earlier lighter version...and a later heavier 1....

    when were these heavier 1s introduced and how much heavier compared to the earlier 1s...

    thanx...
    yeh i think the earlier type is 7.4kg. To my knowledge the heavier pot flywheel was never fitted to mk2 astras, Only cavaliers and calibras from 1993 ish onwards.

  26. #25
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    Originally posted by Tim_P
    Why was it kangarooing with no 57i?
    I think its because i removed the intake resonator box and de-cat. Fortunately the breather mod cured it all
    Control is nothing without Power.........

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