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AMD problem

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Nickp

New member
Dear RS Guru's
I am still fairly new to the 964RS world. I bought a car in November that has an AMD chip fitted (285bhp). The car hunts on tickover and is a real pain if I use the car on the road and get stuck in traffic. On the track its great. Is this a compromise I have to put up with with an RS
Any advise?.
Thanks
Nick Pancisi
 
Nick

Its not a chip problem but an RS issue in general. There are many reasons but primarily, I believe its the flywheel. Becuase it is so light, there is no inertia to keep tick over steady. I presume you are suffering from the "normal" issue of coming to a stop in traffic and the engine trying to die and you do need to change your driving style to suit. Or do what I do - have a Smart Car for in town driving!
 
I think mine has an AMD chip with hot film and it drives fine in traffic. My wife drives it and finds no problems.
You should try another chip and see if you still get the problem.

Have you ever driven a 915 box car in traffic. That was fun with the heavy clutch! The RS is a pussy cat. ;O)

Charles
 
Some cars suffer more than others with this, regardless of chip. Some cars with "hot film" conversions can show this up too. You may improve things if you can get the idle adapted. There are two ways to do this 1. take it to a Porsche specialist and get him to put it on the hammer and run the idle adaption program. The other is to switch off the battery , reconnect and go for a spirited drive. I am not sure but i beleive the "hammer" alters some specific values that the "reboot" does'nt. Try the "rebbot" first i guess. Battery and alternator condition seem to have some effect also.
 
NICK,WHEN YOU RECONNECT THE BATTERY YOU SHOULD LET IT IDLE FOR 15 MINUTES WHICH RESETS THE "ECU " I THINK THAT IS WHAT IT IS CALLED. IT WORKED FOR MY CAR AND IT IDLES BEAUTIFULLY!
JEFF
 
Thanks for the info guys
I will try the battery switch off first. I thought that if all else failed I would replace the AMD with the original Porsche chip. Not sure how much difference it would make.
I took the car to Donnington last week for my first track day, apologies if I got in anyones way. I think I now have the record for the slowest RS ever to circulate the track. They are a bit twitchy in the wet!

Nick
Maritime Blue 964RS
 
Idling speed on mine is fine once the car is warm, but often stalls until warmed up, particularly on cold days. Could this be cured the same way, or is it more likely the choke needs adjustment? I believe mine is hot film, but I'm not sure how to tell - what does it look like? Also, is there an easy way to see what chip is fitted? As you can probably tell, I'm not very good on the technical stuff!

Nick, I was at Donington too. It was really slippery wasn't it! Maybe, like me, you were struggling with the wrong rubber? It was not a day for out and out track tyres.

 
Don't leave the car idleing for 15 mins, take it for a spirited drive. This allows the dme to relearn it's parameters. Hot film units fit on to the air filter box in place of the vane/flap air metering device. The hot film units tend to look like plastic tubes. The old metering unit will be square ish in comparison. A picture paints and all that, hopefully someone will post a piccy.
 
One of the benefits of idling for 15 mins to reset is that the car does actually idle...if you take it out and rev it, to reset, you can find the car may not behave well at low and idle speeds, maybe stalling on low speed manouvres,,,,this is one of the potential disadvantages of the Lwf.
 
Have an AMD chip which seems to work perfectly hot or cold car never stalls and maintains a regular bouncy tickover between 500 - 900 RPM.however evry 964RS has a different set up, cup pipes, remap, airboxes, engine mods etc so this may not be the AMD chip itself.
 
Hi Nick.

The guys above who say let the car idle are correct in my opinion. I cured my problem the same way and later found out it actually says this on P.90 of the owner's handbook.

Martin
 
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