dualblade

so i bought a fidanza flywheel to take some of the weight off but i've got a question about it. i notice that the old flywheel has teeth but the new one has none. is there a significance to the teeth and the resulting space? is the space what the reference sensor uses? also, on the new flywheel, there's a little black allen bolt. any idea what this is for? you can see the space in the teeth on the old flywheel and the allen bolt on the side of the new flywheel in the photo.

iloveporsches

The old flywheel should of had that little bolt, at least mine did. I might have something to do with the sensors, but I know it must be pointing straight down when you install everything. I don't know why, but I just followed the procedures.

dualblade

ok, good to know. i will point mine straight downward then too although i'm not sure why that matters. the old flywheel didn't have that allen bolt

iloveporsches

Oh yeah, my flywheel didn't have teeth either, but I have an 83 NA, not an S2 so there's an obvious difference.

Rob

On the the standard n/a and turbo cars, the allen set screw and the ring gear teeth are used by the speed and reference sensors to determine crankshaft position while running. From the looks of your S2 flywheel, I would image the S2 uses the cogs for this purpose (60-2 pattern) and using the aluminum flywheel shown would result in a no-start/no-run condition. You should probably verify this with somebody that knows the S2 better than I before installing that flywheel.

Rob

Mike 89 NA

Both my 968 and 944S flywheels have the same number of teeth (both 16 valves), I've never checked the three NA's I've owned. I've been told I can use the 944S flywheel with my 968 engine, I'm doing a swap. I suspect you need a different flywheel.

Mike

MHT

THE LIGHTWEIGHT FLYWHEEL YOU HAVE IS NOT FOR AN S2, it's for either a turbo or 8 valve NA car. The allen head bolt is responsible for the pulse from the reference sensor.

Derrek Khajavi

Yep, wrong flywheel dont waste your time putting it in.

SoCal Driver

The "S" cars use one sensor for both speed and reference. Think the 968's use the same setup.

dualblade

ugh, that sucks. so there's no way i can use this with my car then. does fidanza make a lightweight flywheel for my car? i spoke to the guy who supposedly designed the fidanza lightweight for the 944 and he said this would be the one for the car.

Matt Sheppard

That thing wont work. I hate to contradict the designer, but it just plain wont. The DME is looking for those tooth-driven signals and it wont happen w/ the aluminum one.

dualblade

oh i'm not saying you're wrong, i absolutely think you're right. i'm saying i can't believe that i spoke to the guy who designed the flywheel and he said it would work. i would think he'd know what he's talking about. i've got a few choice words for fidanza tomorrow. one last thing, under fidanza's chart of flywheels, they have a "968 dual mass replacement". is this likely to fit in my car? not even sure i'd want it because it's only 2.5lbs lighter than stock

Derrek Khajavi

Just as a side note:

944 S, S2, and 968 cars have a cam sensor and a crank sensor and run sequentially.

special tool

Some Fidanzas reuse the original ring gear. I cant tell from the picture, but I assume you have eliminated the possibility of putting the old ring on the Fidanza.

CarreraCup03

Looks like the wrong Flywheel .. send it back and get one from Paragon or Lindsey Racing. They will take care of you!
944turbo