Engine Mod for Idle ?

[GC1]

Does anyone have this on their 2.5 ? heres some photo's,any idea of parts,etc...

[peterguk M500]

Never had a problem with my idle.. In 50,000 miles. (MBE ECU and ISC fitted and working).

Is this an ECU related issue? Still got the MM ECU?

[Gadgeroonie]

it will raise the rpm when the air con is switched on

fitted to weber marelli ecu's


could also be used to raise rpm whilst the engine is cold

[TOENHEEL]

Is the part not a vacuum switching valve?

http://www.autoshop101.com/forms/h61.pdf

[joust]

Gadgeroonie said:

it will raise the rpm when the air con is switched on
fitted to weber marelli ecu's
could also be used to raise rpm whilst the engine is cold

Don't think so.

I'm sure that's the overboost controller that modfies the pressure of the wastegate. It was developed on my original 2.5l. Gives around 340bhp peak IIRC.

J

[GC1]

Thanks for the help guy's,if you notice the idle throttle vaive has been disconnected which makes me think this is something to do with idle control,also where this is situated.
My ECU has been uprated.keep them coming in someone on here must have the same thing and knows what it does....

[jdearden]

I think the trottle valve sensor is disconnected on all of them. I never seen one connected. I also have a 2.5. And don't have this addition u have.

[Gadgeroonie]

the idle control valve was never fitted

put the aircon on and see if the idle will raise

what version of ecu do you have ?

[sean_goodman]

is it bleeding off the boost pressure signal for the wastegate thus acting as a crude boost controller to get more boost?

[mgbond]

A past member of this forum had one and it was for boost (Humpy). Think it was Paul (Ramons mate), come to think of it neither has posted on here in a while.

Bondy

[joust]

It's the overboost controller guys.

As I said, my 2.5l was the first to have it fitted and then mapped by Yellowshed.

Here is the before and after dynos



340bhp on the nose.

J

[The Snail]

Thats a good result, well spotted GC1, Shar will be pleased when she finds out she has a few more horsies to play with. Best get some new rear tyres with some tread on them!

[Noblescort]

mgbond said:

A past member of this forum had one and it was for boost (Humpy). Think it was Paul (Ramons mate), come to think of it neither has posted on here in a while.

Bondy

Not sure where Ramon is these days, but I bought Pauls (Humpys) car and it still has the boost controller fitted

[Gadgeroonie]

joust said:

It's the overboost controller guys.

As I said, my 2.5l was the first to have it fitted and then mapped by Yellowshed.

Here is the before and after dynos



340bhp on the nose.

J

run it again in third gear and show us the graph