When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I had intended on installing the Mercedes updated K1 spring kit.
I have noticed the 2-3 shift can sometimes be a little lazy.
At SITM, I had a conversation with Hans about this transmission. Since I was going in to do the K1, he recommended I get the shift kit and do them all.
I am following a couple of different write-ups on this shift kit, taking cues from what Porken did on his 86.5.
The 928 auto trans is not a toy, everyone has opinions of how an auto transmission should feel as it shifts.
Some think it should slide into each gear smooth like the mini van they drive everyday.
If I take off slow, I can hit 3'd at 50mph, and never feel it, but from a go light, when I gas on it, she'll hit 2'nd hard enough to do a little chirp.
Nothing wrong with the car at all.
However, to be blunt, it doesn't shift hard enough for me. Granted, I think there are a few issues going on. Cables haven't been adjusted in years, PO screwed the vacuum modulator all the way in. Vacuum line to the modulator was split at the end. Fluid was last changed 18 years ago.
So, I am doing all that: new fluid, new filter, new reservoir, new modulator, adjusting all the cables and modulator.
The Red Witch will not chirp a tire under any circumstances. I think she should shift more crisply. From my research into this, and my experiences with other automatic transmissions, a spring kit will do this nicely.
Yes, I am an automatic guy. No, I can't chew gum and shift at the same time.
Just my 928 cents, but before modifying a no-working stock system, I'd try to make it all correct as a starting point. Else you may find yourself chasing issues you induced, same goes for Engine mods too.
Then put in the kit if it's needed, the S3 Auto trans starts out in First and will stay there(1st) until around 6k if you hold the peddle down when the shift lever in in #2, then bump it to #3 and then on to D.
S4's on the other hand need some extra effort to get them to start out in first and many of the mods out there are to address S4's, so make sure you are following the S3 mods
Hmmmmm...I will swallow my pride and say that makes sense.
I am still going to install the Mercedes K1 update spring kit. And give the valve body a spray down with brake cleaner. I will not disassemble the valve body.
Since we are talking about making stock work, can anyone point me to the correct section of the WSM for adjusting the accelerator pedal cable on an S3?
I have been sifting through the WSM, but can't find it.
I have searched but mainly have found S4 stuff, and a couple of vauge instructions.
A good rule of thumb for the accelerator cable adjustment is "as tight as possible while still allowing the TPS idle switch to click on return." The bowden cable should be adjusted so that the socket is directly above its ball on the throttle quadrant after the accelerator cable is done.
I would probably leave the brake cleaner on the shelf when the valve body is out. There are potentially sensitive seals in there that may not do well with the solvents in brake cleaner. The consumer stuff is mostly acetone, while the 'pro' has carbon tet and other nerve killers mixed into make it more effective. Meanwhile, the seals in the trans will soften and swell with even a little of the wrong solvent.
and a word from the cleanliness lobby...
The trans (like most precision hydraulic devices) is extremely sensitive to particle contamination. It may be a little late for yours, but for others playing along at home: Spend the time and effort to completely sanitize the transmission and surrounding pieces before you do anything more than a visual level check at the little reservoir. I use a spray engine cleaner when it's grubby, or some spray detergent (Formula 409) if it's relatively oil-free but a little dusty/dirty. Dirt falls from everywhere, and will travel sideways when necessary to contaminate a project. Clean also makes it much easier to work on, and makes it possible to identify small leaks visually, rather than waiting for damage and funny shifting from low fluid levels.
I figure i sould be able to put my sandwich down pretty much anywhere on the car, and be able to finish it without worry of contamination... of the sandwich.
I took a crack at the shift kit on a spare valve body and didn't appreciate the rudimentary instructions. I then swallowed some of my pride, and sent the known good one to Precision Motorsport for a rebuild/adjustment to firmer shift points. I'm pleased with the results.
Recommend you check out the B2 servo/piston update while your messing around there- the external part is very easy. The internal sleeve that more challenging.
07-04-2016, 10:28 PM
I am in some stuff now...transmission festivities.
