Hi Guys,

Does anyone know how to reduce the engine braking effect you get when you lift of the throttle in gear...

Obviously I am not talking about high rpm stuff, just < 3000.

Its pretty annoying to be coasting around and then having the car jerk when you take your foot off the gas...

any ideas?

Cheers
Dave

 

Pulling timing should technically help, but I've never tried it at those RPMs.

 

I guess I should do a log and see whats happening haha

 

Wouldn't a heavier flywheel do that? More momentum and all... I'm not sure that's what you really are looking for though

 

put the car in a higher gear.

 

It could be a couple of things.

Look for a fuel cut parameter based on rate of change of throttle position. Associated with this parameter will be some minimum engine speed. Below this speed (or if above this speed but below the TPS rate of change threshold) the injectors will remain on.

Raise the TPS rate threshold and it will require more aggressive throttle lifts to go into full (injectors off) engine braking.

 

Are you talking about the throttle hang thing??

Like when you rev up to 5K, let off the gas and its feels like it has a 1,00lbs flywheel?

 

Has it always behaved like that or is it a typical performance modification reaction (BOV, ect)

 

Most jerkiness goes away with just learning the quirks of the car and getting used to that - but I assume you've had this car a while.

Although many do not like engine dampers, they should help with jerkiness on throttle lift.

No one wants or offers a heavier flywheel, but that would help jerkiness.

Switching to urethane mounts could help.

More low end torque will to, there you're into a 2.3 stoker or cams.

 

thanks guys - i think its always behaved like this... although if I had to point to one modification I would say the frontpipe could be "causing" it..

i've had the car for 1 year and changing up a gear doesn't really help

 

Front pipe being the lower intercooler pipe - between the turbo and the intercooler?

I know mine is very tight with the intercooler connection, and I'm sure flexing may have caused leaks in the past with standard hose clamps.

I changed mine to t-bolt clamps - I don't have jerkiness anymore, but I can't say this is the reason it went away.

 

no between the turbo and the cat ie exhaust stream

 

Ah, the downpipe. I can't see how this would effect jerkiness. Are you still running the stock IC and piping?

 

yup...

MR BOV thou (ie not the plastic one...)

 

Buy an automatic.