dfinnegan

Loren, what happens with the idle in the case of a battery disconnect and no hammer adaptation?

Lorenfb

"what happens with the idle in the case of a battery disconnect and no hammer adaptation?"

The closed-loop still maintains the target idle of 880 RPMs but it's not optimized
for load changes, e.g. the A.C. compressor, the fans, the lights, and the adapted
CO setting.

KirkF

Regarding building a tester, the hard part is actually the cable.

The 19 pin plug that is used on the 964 is not available anywhere worldwide. You can still find a couple of the hammer cables at horrible prices, but if you want to make a new 'hammer' you won't be able to find the plugs.
The other option would be to hard wire a regular 9 pin serial interface into the wires behind the 19 pin plug or have a manufacturer recreate the 19 pin plug for you.

Kirk

PCar SBA

I would use a LEMO connector. These are state-of-the-art and come in all sorts of configurations. Some are even water-tight.

PCar SBA

Loren, I always thought that pin 40 and 41 at the DME comunicate when the AC-compressor kicks in. That allows the DME to compensate for load and raise the idle if required.

springer3

John Speake was selling aftermarket hammer cables. I had one, and the quality was very good. My understanding is that the connectors are available commercially. It is just a matter of constructing a cable with the correct pin-out between the hammer connector and the 19-pin connector in the car.

It is possible to connect individual pins. I don't remember the exact count, but recall about 5 wires are all that is needed for the interconnection.

Lorenfb

"I always thought that pin 40 and 41 at the DME comunicate when the AC-compressor kicks in. That allows the DME to compensate for load and raise the idle if required."

That's true, but just compensate (minor correction). You still need to "center" and
have a closed-loop idle system.

Pin 41 - A.C. button on CCU pressed
Pin 40 - activate compressor clutch relay & raise idle a small amount

LeRoux Strydom

I am sure I can do the pinout and build a cable with a RS-232 connection for a laptop. The questions is where to find the software? Someone mentioned VB software? I am not really interested in manipulating things like the idle and CO adaptation (although it would be nice), but to see and clear faults would be a great diagnostic help.

Lorenfb

The thread exemplifies one of the reasons that the newer vehicles with many ECUs
and their complexity are no longer DIY vehicles. This fact is even more so for the
Boxster, 996, 997, & especially the Cayenne.

The followup tester to the Hammer, the PST2, cost initially about $8,000. Now
the new Porsche tester requires a first year financial commitment of about
$25,000. Other cars such as BMW & M/B each require dedicated testers costing
$10,000-$15,000 each. Having the testers is only a minor part of the diagnostic
"equation", the user must still have a thorough understanding of the basics of
all the system ECUs, which many techs lack. Thus, as the vehicle's complexity
further increases, only minor repairs will be done even by independent repair
shops.

Laurence Gibbs

Loren given your business i suppose i should not be suprised at your view. But i think it's a bit pessimistic. People were saying the same thing when ecu's were first fitted,but nothing (not even a ecu) gets in the way of basic fault finding. I remember years ago people were claiming the end of the tuning industry. Reality is the tuning industry has prospered. There will still be people willing to play around with the new cars when they age. Someone will come up with a way around the difficulties. What seems inpossible now , wont in ten years time.

Laurence Gibbs

With regard to the cable. It may be a 19 way connector but for diagnostic purposes 4 pins are used K, L, +12v and GND. A simple universal cable will do the job. In fact something very basic will do, if you know what you are doing.

Lorenfb

"I remember years ago people were claiming the end of the tuning industry."

It has basically ended! There's very little that can be done on the 993 and especially
the 996 and later ones, given OBDII (controls on emission systems) and the present
engine management systems, i.e. basically max performance and limit tweaking.

"Reality is the tuning industry has prospered." Not here in the USA

The real issue is not just tuning, but having the knowledge & equipment
to analyze the present automotive systems which most/all DIYs can't.
These new problems aren't the type you "see", e.g. fuel leak, but
require complicated diagnostics.

Laurence Gibbs

Try telling that to Ruf, Ninemeister,Roock,TTP, Gemballa,Manthey, Mammerow and the very many others i have failed to mention and i've not began on the US ones. All of whom have or are developing tuning for 993 and beyond!!!

Lorenfb

"All of whom have or are developing tuning for 993 and beyond!!!"

That's called radical mods & way beyond what's considered a "tuner" and
most likely would not be "street legal" here in the USA. It's not the '50s
here anymore in the USA when anything was O.K. The governments here
don't want ANY mods done to vehicles!

KirkF

Regarding the 19 pin connector, I believe John Speake actually had the connectors made. I would be interested in knowing whether that is the case or he found an available supply of them somewhere.

Can someone ask him?

Kirk