eman930

This is great information, Now what about a 4 degree advance with a Late NA cam swapped in?

Butters944

Soo... With these kinds of gains for such a cheap thing... Why doesn't everybody have it?

Rogue_Ant

Probably very similar gains.

Because nobody has systematically gone through and proven what actually makes a performance gain on the 944NA. Or, if they have, they haven't bothered to share their results.

Additionally, with the stock AFM, the upper-hp results would probably be diminished. With the MAF, being much more free-flowing, the car will not choke-out in the upper-RPMs, unlike with the stock AFM.

A.M.H

Now the FQS in the DME can change fuel delivery advance/retard as well as timing advance/retard, -3/-6 & +3/+6 on both. Can this be utilized in conjunction with the NA-tune and offset key/s to further fine tune it? Or is the FQS bypassed by the mod of the DME to 28pin with the tune, hence buying the cam key/s?

I ask because I already run +3 in fuel delivery due to my car running a little on the lean side, and it has helped with the way it runs. I also tried keeping a stock fuel delivery ratio but retarded the timing by 3 to see if it essentially had the same effect, but I experienced some audible ping when doing so, so I put it back to 0 on the timing and left it at +3 fuel advance.

Rogue_Ant

Where the confusion is typically due to not differentiating between ignition timing and camshaft timing. The two are separate, and on our cars one does not affect the other.

The FQS, in factory software, can make a slight adjustment to ignition timing. It has no affect on camshaft timing.

The offset key affects camshaft timing, and likewise it has no affect on ignition timing.

Furthermore, for the NA-Tune I changed the FQS to provide a greater fueling-adjustment range, and no longer adjust ignition timing (there is really no need for user-adjusted ignition timing on an 944NA).

F40LM

Hopefully will get a chance to FINALLY get this done this weekend. For anyone needing instructions on how to swap the cam key out:

http://www.benms.com/944camseals.html

Michael

A.M.H

Ok sweet. Thanks for clearing that up for me. Some day in the future I will be purchasing your NA-tune. After the rebuild that is :-)

eman930

So will a 951 benefit from this also or just the NA's?

Butters944

Would advancing cam timing like this have any negative side effects? (rougher idle, etc)

Rogue_Ant

Yes - boost will come on quicker, and the motor will have more power off-boost. After seeing how good the results were in my 944NA, I immediately went and advanced the cam in my 951 (the 951 has a fully adjustable cam-gear).

Actually, with the cam advanced, the car should have a nicer idle. The only negative, is that power near red-line might be slightly down compared to a stock phased-cam.

V2Rocket

...would one expect additional gains as with the 4* advance, if the gear were advanced a tooth and then back with a key, to +5* or +7* advance?

CO951

Josh, I'm about to do my head gasket. This sounds like a nice & cheap little performance bump. Would you recommend that I do this while in there?

V2Rocket

Bumping for question, I'm pretty sure I know the answer but looking for other confirmations...
Shouldn't be any problem (valve to piston clearance-wise) running the full 9* advanced (1 cam gear tooth)? Just how far can we advance it if we wanted to?

snb13

I'll jump in too:

Do you have a new FQS chart? I believe I've been running rich. I think I have the FQS at 0 position, but not totally sure.

I have the NA-Tune, 4* cam key, .020 shaved head and the MSD HVC-II coil.

Noahs944

We do