915 Shifting Issue- Help Please

minoclan · 05-23-2010, 07:46 PM

I just got my car back from about two months in the shop to do a coilover suspension and a rsr sway install. I had them adjust the shift linkage. The trans has low mileage and new Swepco.

It is hard to go from 5th to 4th and there is a little grinding also. I am shifting slowly and not ramming it back. Any thoughts?javascript:checklength(document.vbform);

tcar · 05-23-2010, 07:50 PM

So... TAKE it back to the shop and tell them to fix it.

minoclan · 05-23-2010, 07:58 PM

Quote:

Originally Posted by tcar

So... TAKE it back to the shop and tell them to fix it.

I will but I need to understand if it is a linkage adjustment issue or is it syncros or some other issue. There is a lot of experience here that can probably give me a little insight.

island911 · 05-23-2010, 08:02 PM

Is it hard to shift, or slow to shift? (linkage vs syncro's)

minoclan · 05-23-2010, 08:04 PM

It is hard getting it into 4th. Hard to shift. All other gears are smooth

island911 · 05-23-2010, 08:09 PM

sounds like a syncro.

It is a lot of work for the syncro to down-shift into 4th. (or any down-shift) ...esp when the rpm drops far below the needed rev's. (shifting slowly w/o rev matching)

Hugh R · 05-23-2010, 09:00 PM

If it finds the gears going up, but not down most likely synchros. If it can't find the gears either direction, probably shifter adjustment, but I'm no expert.

tobluforu · tobluforu's Garage

How did it shift before you had them adjust it, better or worse?

minoclan · 05-24-2010, 04:58 AM

Quote:

Originally Posted by tobluforu

How did it shift before you had them adjust it, better or worse?

My other car is a 997 Carrera S. I had a GT3 and an 87 G50 car before this. I found the shifting to be very imprecise. We just installed the Seine kit, but that should not be causing this issue. It never feels like I am solidly in 4th. When I go to neutral and pull it down into 4th is when I get the grinding.

john walker's workshop · 05-24-2010, 05:19 AM

possibly you're nicking reverse on the way from 5th to 4th. couple adjustment. try kendall 80/90 instead of the swepco for an easier shift through all the gears.

Groesbeck Hurricane · 05-24-2010, 05:26 AM

Do you double clutch on the way down? This will help the synchros.

minoclan · 05-24-2010, 05:34 AM

Quote:

Originally Posted by john walker's workshop

possibly you're nicking reverse on the way from 5th to 4th. couple adjustment. try kendall 80/90 instead of the swepco for an easier shift through all the gears.

Nicking reverse is exactly what it feels like.

tobluforu · tobluforu's Garage

What kind of coupler do you have in there now, maybe the shop didn't take the time to adjust properly which can take a few drives/adjustments to get just right? Took me about an hour to adjust mine the last time. I now use a hose clamp to mark front to back adjustments. left to right is tricky.

john walker's workshop · 05-24-2010, 08:57 AM

if you have a short shifter, then getting the adjustment correct takes more fiddling around. no slop in any of the bushings?

arbita1 · arbita1's Garage

Quote:

Originally Posted by john walker's workshop

if you have a short shifter, then getting the adjustment correct takes more fiddling around. no slop in any of the bushings?

This is exactly what happened to me after I installed my short shifter. After some more adjusting the coupler it took care of the problem.