eman930

Josh what kinda effect would this have with a M-tune setup??

Rogue_Ant

What are you specifically looking to have answered? My 951 runs my off-the-shelf M-Tune setup (with full tuning and logging obviously).

eman930

Just wondering if this would be a good little boost in power, I plan on getting the M-tune with the injectors soon, I'm thinking this combo at 18/20psi, and the offset key to help midrange would really wake the car up

Rogue_Ant

Well, I run it in my own car... so that should tell you that I liked the results

zerMATT951

Joshua, do you run the 2 or 4 degree key?

Rogue_Ant

Um, well in the 951 I actually run a fully adjustable gear set to 3° advance. In the 944NA I run the 4° key.

eman930

Do you think 4 degrees is too much? What made you pick 3?

Rogue_Ant

4° is fine. I picked 3° on the 951, because that was in-between what I have tested in my 944NA. So, I was just trying to get another "data-point" for my own knowledge.

Quickbeam

Stumbled across this thread during a search. Would one tooth on the cam gear be 4.5 degrees? 40 teeth on the gear, 360/40 = 9 but the cam gear spins only 1/2 turn per engine rotation. Am I thinking about this right?

User 52121

Hey fast924S - got any impressions on the outcome of the cam key?

Duke

My advice is to only adjust this on the dyno. Almost impossible to determine the best cam position on the street. While advancing the cam can give better low-end it can also make the already steep torque fall off at high rpm on the 8v take a dive much earlier in the rpm range. So the total effect can be a slower acceleration car even though boost comes on earlier.

Reimu

I've had the 4 degree advance key in (actually I advanced the cam one whole tooth and then flippped the key around to retard, my head has been shaved a few times so I assume this will get me the true 4 degree) fr a while and I never really noticed a change. I agree that this is one of those things that needs to be done on a dyno. Or at least someone with a stockish car to do a before/after dyno with various timing.

Quickbeam

Anybody know how many degrees for one tooth?

Duke

I found an old dyno chart. Don't remember the exact spec of the engine but I think it was a 2.5l 8v with an N/A cam and GT3582R 0,82 T3 turbo and Link EMS.

I had an adjustable cam gear and tested both 1 deg advance and 1 deg retard. As you can see 0 advance worked best for this engine. Both retard and advance from 0 made everything worse! No gains anywhere.
(The legend colors are switched green/red).

User 52121

I'm pretty sure Rogue also did his testing with cam timing on a dyno... (?) He'll chime in eventually I imagine.