Raise the idle - The Unofficial BMW M5 Messageboard (m5board.com)

PowerM · 13th February 2007, 14:31

Based in my previous thread without replys... I think is better to change the question for this...

Someone knows which is the best manner (or simply the manner) to raise 200 rpms the idle of the E39 M5???

The car is an Euro model, this is because talking with Sean (D/A) said that the ECUs are diferent (I do not know in what things...)

Cheers,
Felix

MGZ · 13th February 2007, 14:54

Why? My car idles at abt 600rpms when it's warm. Why do you want to raise it??

PowerM · 13th February 2007, 15:01

Because I have a lightweight flywheel and when revin' down fast the car can not maintain the idle and stops...

I need to raise from aprox. 600 rpm to aprox 800-900 rpm

Cheers,
Felix

MGZ · 13th February 2007, 15:33

I see. Will follow this thread closely.

Need4Spd · 13th February 2007, 15:42

The only way I know to raise the idle is to reprogram the ECU. The idle speed is controlled bya software feedback circuit, so making mechanical changes will simply force the software to compensate back to 600 rpm, until it can no longer do so. I suppose it's theoretically possible to drill a hole in the idle speed compensator if there is one (idle speed is often controlled by a small compensator valve, but not all cars work the same way) but I don't know enough about that for this particular car to have any concrete suggestions. Drilling the hole would be tricky in any event b/c it would be hard to know how big to make the hole w/o experimenting, and possibly ruining a few compensators in the process. Isn't anyone, like Powerchips, able to reprogram your ECU?

m5admirer · 13th February 2007, 15:44

As far as I know the only way to do this is by software. Companies like PowerChip can do it for you when upgrade to their software.

Rob.

PowerM · 13th February 2007, 15:50

Powerchip and other brands based in the US are not capable to resolve the problem in Euro models...

Other brands from EU can not do it except one in the UK but needs to have the car and I am living in Spain so very expensive...

Thanks for the idea of the hole... If I do not ear something better I will try with this but I have time to find a better option

Cheers,
Felix

PowerM · 13th February 2007, 16:00

I am looking about these terms in the www.realoem.com page...

Using IDLE as a word string to find... the results was:

Part 13411733090 (T-SHAPE IDLE REGULATING VALVE)... I do not know if this valve do the same work as I need...

T-SHAPE IDLE REGULATING VALVE 1 03/1999 13411733090

Cheers,Felix

Frits · 13th February 2007, 16:13

Are there no decent chip-tuners located in Spain? I mean, guys that can adapt software themselves, and not just copy some values from another company?

I got my M5 chipped, and there were definitally values I could choose for myself, e.g. rev limiter, speed limiter etc. I'm 100% sure the guy that chipped my car (http://www.power-plus.be) can fix your idle problem.

PowerM · 13th February 2007, 16:22

Thanks Frits, Can you give me an aproximately price of the ECU you are using...

Mine is an UPSOLUTE ECU, I talk yesterday with they and said it would be posible to do this putting more load, but this affect to all of the rpm range not only in the idle!

Cheers,
Felix

Frits · 13th February 2007, 16:27

I payed a little over €500 for the software if I remember correctly. Prices are on the site, I payed less than the advertised price.

PowerM · 13th February 2007, 16:30

Quote:

Originally Posted by Frits

I payed a little over €500 for the software if I remember correctly. Prices are on the site, I payed less than the advertised price.

Ummmmm nice price!!!! but the problem is I am in Spain and these guys are in Belgium... and I can not go to there with my car...

Thanks a lot!!!

Cheers,
Felix

Frits · 13th February 2007, 16:32

You could send them your ECU, they adapt it, and send it back. Ofcourse, you won't be able to drive your car in the meantime...

PowerM · 13th February 2007, 16:55

I am talking with the BMW about the T-SHAPE IDLE REGULATING VALVE and how it works... finally we think the solution is like follows (I do not know why the BMW do not say nothing of this before

)

Dismounting the valve I can extract a ball that move inside for opening or closing (have a hole through it to air pass) if the hole is greater the idle raise...

The other solutions is send the ECU to the guys Frits said before

but is my second option because is more expensive...

Cheers,
Felix