ALDA boost disconnect=better performance?! - PeachParts Mercedes-Benz Forum

mespe · #1 06-01-2010, 08:16 AM

If somebody adjusted the ALDA incorrectly, removing the boost line might increase performance.

LUVMBDiesels · #2 06-01-2010, 10:12 AM

Is it an OM603?
If so there are two lines going to the ALDA, one is the boost line from the manifold and one is a vacuum line that keeps the ALDA from increasing fuel until the car is warm and the vacuum switch shuts off.

If you just pulled the vacuum line you would see an increase in performance.
If the vacuum line was pulling a strong enough signal to counteract the boost even when the car is warm pulling the lines would show you increased performance.

I would run a line directly from the intake manifold to the ALDA and see what happens.

Or you can do what I did and remove the ALDA and just plug the lines

winmutt · #3 06-03-2010, 09:45 AM

Quote:

Originally Posted by mespe

If somebody adjusted the ALDA incorrectly, removing the boost line might increase performance.

Impossible, assuming they didnt break it.

locry · #4 06-04-2010, 02:47 AM

Quote:

Originally Posted by winmutt

Impossible, assuming they didnt break it.

that's what i thought too...

to make things clear... the ALDA just lets one access the "remaining" rack travel correct? so is the transition gradual? depending on throttle/boost? or is it basically an on/off deal?

let's go further... is the max rack travel on a non-turbo 603 IP the same as a turbo 603 IP when the ALDA isn't boost activated (eg. boost line disconnected)

i want to know if running without turbo assist is the same as driving a non-turbo.

winmutt · #5 06-04-2010, 08:56 AM

Quote:

Originally Posted by locry

that's what i thought too...

to make things clear... the ALDA just lets one access the "remaining" rack travel correct? so is the transition gradual? depending on throttle/boost? or is it basically an on/off deal?

let's go further... is the max rack travel on a non-turbo 603 IP the same as a turbo 603 IP when the ALDA isn't boost activated (eg. boost line disconnected)

i want to know if running without turbo assist is the same as driving a non-turbo.

It's a fuel cut off switch using boost as its signal to turn on the fuel. It is gradual. Look at the section on the turbo charger in the fsm, they have a cut away diagram of the ALDA.