Ed Scherer

Argghhh!!!

Yes, I do!

I pulled the wrong relay and was looking at the wrong socket! I was looking at XIX instead of XVII.

The extra contact is a narrow one.

Stupid, stupid, stupid.

Sorry to bother y'all.

fbarnhill

Ok guys, I will be doing an intake refresh on my 88s4 in the next couple of months. I would love to do this mod. Did anyone ever figure out if it would work on the earlier s4s? If not, I am willing to give it a shot when I get started. I need to do refresh the fuse panel anyway. It will be a good time to do these things and since I still have my 79, I can take as long as i need to do the job right.

If anyone has a writeup already in either pdf or .doc format, I would appreciate any and all advice.

Thanks,

borland

If the car can accomodate the later GTS Throttle Switch, then it should work, however depending on the year, more wiring is required elsewhere.

- 89+ - Yes, same mod as described above.

- 87'-88' - Yes, but one additional wire (pin A) is needed to add a speedo signal to the kickdown relay (89+ get this speedo signal from the digital instrument cluster), speedo signal would have to come from the differential speedo sender which provides signal to speedometer and cruise control.

- Pre 87 with 4-speed auto - No, not recommended, GTS throttle valve switch may not adapt, pre-85' CE panel design has earlier relay sockets which may not work with later GTS kickdown relay.

Ed Scherer

OK, I'm going to have to wait until tomorrow to finish this up (wife wants to watch Top Gear episode from last week's marathon!), but until then, here are a couple of photos:

Original kickdown relay from '90 S4 (left, part number 928.618.108.00) and new relay (right, part number 928.618.108.01) that supports dynamic kickdown. Note additional small pin on far corner. That's the one I need to add a connector for on the relay socket.



And here's the corresponding socket. Contact spring will be added at lower left corner (terminal number 6 as labeled on the socket). I noted that (just in case something goes very wrong... ) the relay sockets (part number 928.610.511.00) are available for only about $3.

Schocki

Keep us updated Ed! I would like to know what you think about it when you drive it the 1st time

Vilhuer

No changes needed in gearbox or its wiring harness? Currently I have 2.20:1 ring & pinion in GTS gearbox. 1st through 3rd are too long and I'm thinking about puting in US '87-88 S4 box to lower them. Dynamic kick-down works fine with current setup.

Ed Scherer

Got the mod done mostly late last night (finished putting the CE panel and EZK/LH etc. back this morning).

I'll include a few more photos here to assist others doing this in the future, with little explanation since most of that has already been done earlier in this thread.


The jumper wire that goes behind the CE panel to connect terminal V22 to relay XVII contact #6.




The "two jeweler's screwdriver" technique for "unlatching" the relay socket. This is a little tricky. I experimented on the ignition monitoring relay (the one that hangs on the EZK/LH bracket) first to see how it works. When you unlatch the relay, the front (i.e., on the side opposite what's shown here) will pop out about 3 mm or so. This is kind of hard to do (IMHO), because you're trying to work your way through a few layers of spaghetti and actually see what you're doing.




Relay XVII contact #6 is now filled in. It looks like it's not sitting right in the slot (it looks too high), but it's just the camera angle. After seeing this photo, I pulled the relay to make absolutely sure it was OK; it was.




Back of CE panel, showing the new jumper wire added. It's the yellow (yellow with blue stripe, if you look carefully) wire nearest the upper right hand side.




Routing of wire through firewall (look for yellow wire passing through the grommet in the center of the photo).




Same yellow (yellow/blue in some places, where I remembered to add a blue stripe to it) wire now terminated at CE panel connector position V22.

ELJG

Since you guys are working precisely on the dynamic kickdown I thought you might be able to give me some clues on a infrequent but troublesome problem: once in a while when activating the dynamic kickdown it engages and sticks (will not release). When I say sticks I mean it continues to accelerate till it hits the rev limiter. The solution is to flip the gas pedal again (as when engaging the dynamic kickdown in the first place). I had thought that the cruise control was sticking and am in the process of replacing the throttle cable although, it seems to me, if the throttle cable was the problem it would surely stick under normal acceleration (yet to happen). The car is UK 95 GTS and the MAF (for what it's worth was replaced by Porsche about 2 years ago. Porsche haven't a clue. Could a bad relay cause this? or what? I'd be most grateful for any ideas.

Many thanks and best wishes,

Ed Scherer

Take a look at the thread "Stuck Throttle (in the Mountain Twisties, no less!)" that I posted about five years ago.

ELJG

Thanks for the pointer/info Ed - makes interesting reading - will print it out to check it out and will let you all know the outcome.

Gene

Alan

Sorry this has nothing to do with Dynamic Kickdown - Kickdown affects only the trasnmission behaviour not the throttle - sounds like you just have a sticky throttle linkage somewhere - OR possibly a problem with the Cruise (if it was on)

Alan

ELJG

Sorry I was only making that connection because it has only happened to me in connection with the dynamic kickdown. Thank you for the info and apologies for raising this on what now appears to be the wrong thread.

Ed Scherer

Since I finally got my car put back together Monday night, I got a chance to drive it yesterday evening and then drove it to work today.

Dynamic kickdown is nice! Works very nicely at highway speeds for, example, passing. Just press the pedal a bit, and there it is: 3rd gear.

Thanks, Schocki, for figuring this out and posting it years ago.

And thanks big time to Borland for telling me about it just in time as I was doing my intake refresh. Perfect timing! I just don't remember seeing this thread and would have really regretted missing a perfect opportunity to implement it.

Dwayne should put a mention of it in his intake refresh guide, as it's something that everyone should consider when doing that job.

John Speake

Has anyone confirmed this will work on a pre digidash car ?

John Speake

Bump, as above. Also, has anyone measured the speed signal from the diff and compared with the speed signal from the digidash ??