c5_pilot

I posted in the past about my poor running and new to me '83. Turns out the DME is bad so I am planning on buying a rebuilt one. Since mine has never run good enough to find out if I have the classic stumble issue that most had, my question is this. Should I purchase a late model DME and matching AFS vs my early one to eliminate the stumble issue ? Also , I understand this would allow the DME to be chipped although I understand the gains are not huge. I plan on tracking and autocrossing the car so this type of stumble could really be annoying. Some say the FR Wilk chip is certainly worth it.

Thanks

Rogue_Ant

I would suggest going with the late DME/AFM. If you do then you could use the DIY tuning, and tune the car yourself:

DIY Tuning

V2Rocket

if you need a late afm i have one i can sell you...

c5_pilot

Ah yes, I looked at your tuner awhile back but I was jumping the gun a little considering the state of my 944. Does TunerPro include any type of baseline performance tune over stock I could start with before tweaking parameters ?

Rogue_Ant

No the base tune is what is supplied. But most aftermarket chips aren't anything special - it is all stuff you can do on your own with TunerPro. I would be happy to answer any questions.

Van

I've had ECU Doctors in florida rebuild an ECU for me... That might be the easiest route.

M758

Don't bother.

Keep the early DME. You can run the late stuff, but it is best to use a late DME harness and idle stablizer valve. Much easier just put in the right DME and be done with it. Consider 5 min fix vs 4-5 hours.

V2Rocket

can i ask what would be the 4 hour fix?

M758

Late AFM, Idle stabilzer valve (must remove intake manifold) and DME harness. If you cannot get a 924S DME harness you will need to adjust some connectors to make a 944 DME harness work.

There are a few different pin outs on the DME for early vs late. You can mix the harness and DME, but don't expect it to run perfectly at idle. It is workable for a track car, but not acceptable for a street car.

V2Rocket

a few weeks ago i plugged in the afm/dme from an 86 into my early 85 and it seemed to run fine...i thought changing the isv wasnt necessary

M758

It will run, but not quite right. I had to swap my 87 924S harness from my 84 944 and put it orignal 84 DME harness back in. This is attaching to an 88 944 motor complete with 87 injection. I lost idle control and altitude sensor. The car runs fine at 1000 feet, but idles poorly. I raced it like this last week and felt no ill effects on track, but it did not idle properly. I have since aquired 87 924S DME harness to replace the 84 one.

For a street car it is far easier to just use an 83-85 DME than deal with all the rest of the crap on mix stuff.

V2Rocket

i just went out and swapped my early dme/afm for my late dme/afm and the car started right up, got a good idle going and i let it warm up and lots of throttle blips and all is well..