mark944turbo

The later cars have the altitude sensor line to mess around with to change between 3 separate fuel maps on the DME eprom.

86 does not have this ability, does anyone know how to convert? Danno mentioned something about it in one of his posts, but no details. Is it possible?

89PorscheTurboMobile

Altitude sensor? Is that the later car's version of the FQS?
What's it look like and how do you adjust it?
I have APE Stage II chips, what setting should it be on?

mark944turbo

No, the fqs does 1 change across the board while the altitude switch changes maps that can be finely adjusted. You should have FQS all the way counter clockwise, position 1, and leave the altitude stuff alone.

threesticks1

In the schematics it shows two different ways. The US cars (cat equiped) have the altitude switch located above the passengers feet that leans out the mixture above something like 3,000 feet. The Euro (non Catalyst) cars have a 1.8K Ohm resistor installed instead of the altitude switch. There is also a jumper installed between pins 1 and 3 at the O2 sensor connector, DME side, in the engine compartment.

I have an '86 and it does have the altitude sensor, I have run my car both ways and can feel no difference in the power. I haven't dynoed it so I can give you no hard numbers. I have been told the in the "Euro" mode that the DME will run in open loop at a slightly richer mixture which can damage the cat over time. I do notice a slight drop if gas milage when in the "Euro" mode.

Hope that this helps.

89PorscheTurboMobile

Thanks Mark,

What does the FQS switch look like?
Where's it located? Any pictures?

Thank you.

Darius Juca

No, the fqs does 1 change across the board while the altitude switch changes maps that can be finely adjusted. You should have FQS all the way counter clockwise, position 1, and leave the altitude stuff alone.
Thanks Mark,

What does the FQS switch look like?
Where's it located? Any pictures?

Thank you.

I have the same question..opened up my Dme and klr found nothing to rotate couter or clockwise.the closed them up and looked around and all I found was off this wire loomthing something like a fqs...not sure..plug thing that I have no clue to work

fast951

Darius, The cover on the DME has a plastic plug. When you remove the plug you can see a 8-pos switch.. That's the FQS

hosrom_951

http://members.rennlist.com/951_racerx/FQS-adjust.html

Darius Juca

Thnks John..found it..so I just turn it counter clock till it stops then 4 clicks up...to pu it on 4? LOL john even with toluene I can't bare....

Hosrom you are somthing...man..allways quick and helpfull!!!really appreciate you being around my friend!!! ....well you don't drink but I will to you! in my culture that is a good thing lol