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Wolf_Tm
PostPosted: Sat Oct 02, 2010 8:21 pm 
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Hi,
have an issue with my car.
When I'm in traffic in lower gears (1st or 2nd), costant gas, car bounces back and forth.
I know it's not engine mounts' worn/old because they are poly, so I think it could be a play in the transmission... gears, axles, diffs...
Just wanted to know if someone else suffers of the same thing...

Wolf

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RoAdbOy
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PostPosted: Sun Oct 03, 2010 12:06 am 
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yea, i've the same problem... it shakes really hard back and forth. can it be from the diff.mount? my diff mount is worn.
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Nibbles
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PostPosted: Sun Oct 03, 2010 12:59 am 
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Is it just engine not running smooth at light throttle / low rpm?

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Wolf_Tm
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PostPosted: Sun Oct 03, 2010 8:57 am 
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RoAdbOy wrote:
yea, i've the same problem... it shakes really hard back and forth. can it be from the diff.mount? my diff mount is worn.


Not mine... i have all the mounts new and poly or teflon...




Chris-de-Bear wrote:
Is it just engine not running smooth at light throttle / low rpm?



No, engine is smooth, and I'm talking about a bouncing at constant rpm...

I do have some play on the trans shaft, maybe it's just too much play...

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Diceman
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PostPosted: Sun Oct 03, 2010 11:34 am 
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Sounds like a dodgey mapping spot to me.

Are you using an aftermarket EMS? May be worth checking the decel fuel cut settings.

What you are reffering to is called "drivetrain shunt"

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Kris
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PostPosted: Sun Oct 03, 2010 12:51 pm 
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In some ECUs there is a setting to allow for a dodgy throttle sensor/right foot (jitter) - this allows for a slight varaition in throttle input to the ECU before it responds to that input.

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Wolf_Tm
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PostPosted: Sun Oct 03, 2010 2:09 pm 
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Kris wrote:
In some ECUs there is a setting to allow for a dodgy throttle sensor/right foot (jitter) - this allows for a slight varaition in throttle input to the ECU before it responds to that input.


Yes sure, but this is not the case, i know what you're talking about, my gas pedal is steady in a position, and rpm are constant...
it's just the car that bounce back and forth...



Diceman wrote:
Sounds like a dodgey mapping spot to me.

Are you using an aftermarket EMS? May be worth checking the decel fuel cut settings.



Sure, M400
No, no decel fuel cut (overrun fuel cut) setting... gas pedal is fixed in one position, so no deceleration... that's why I thought at some play somewhere...


Quote:
What you are reffering to is called "drivetrain shunt"


Oh, I think that was when you hear a clunk releasing and suddendly accelerating...
I have no strange drivetrain clunk or sound... just my car "kangarooing"...

As I have some drive shaft play, I thought this was the cause... but maybe that it's due to clutch hub's springs...

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GT-four ST205 Snowy White with selfmade 3SGTE v4.1 - [2.34kg/bhp DynoDynamics]
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