Darien

I've been reading past threads, but what's a the ideal advance settings for an 86.5?

Ken had mentioned 2-3 degrees for 32V, but who's actually done it?

AO

I was just thinking about you... glad to see you're working on it. Sorry I can't answer our question though.

Darien

Hi Andrew,

If everything goes right, Tony will stop by Thur and we'll give the porken tool a try

SwayBar

Here's cam timing results from a GT:

http://www.performance928.com/cgi-bi...ss_parent=1125

I would think the 85-86 cams would yield similar results with respect to timing changes.

jpitman2

The gains shown on the graph would hardly seem worth it.....what does a seat-of-the-pants dyno say through?
jp 83 Euro S AT 50k....with Porken tool in readiness for next belt.

PorKen

Note that Louie's dyno runs are ±3° crank, which is 1.5° cam.

I found that it takes 3° cam advance to be noticeable. Granted, my personal experience is 16V only.

5° is a kick in the pants for around town with an auto.

bd0nalds0n

If there are advantages to advanced cam timing, why didn't they come from the factory this way? Not trying to be a smartass, just wondering. Does it necessitate higher octane gas to prevent detonation or something? There must be a downside, or the low hanging fruit would've been harvested.

jpitman2

Every second person you ask about advance or retard will give you a different answer.......16V 3 speeders driving around town - ADVANCE!!! Track people, rev heads - RETARD!!!!
jp

dr bob

Remember that we are talking about valve timing here, not ignition timing.

SwayBar

These principles are correct.

Kevin Michael

Wouldn't the AutoThority chips give the 3 deg. via the ezk? On the 85-86 anyway.

Vilhuer

Ignition yes, cam relation to crank obviously not.

SwayBar

Answer:

killav

I advanced my cams 1.5 degrees during a cam gear/wp/tb change out. The problem is that I also repaired a damaged wire going to my hall sensor (which could and probably was retarding my ignition timing 6 degrees), I by-passed the rear muffler and removed the air pump in preparation for an X-pipe all at the same time. I don't have the x-pipe yet though. All of these changes together resulted in a much better running vehicle. Much better throttle response, good power. Blipping the throttle results in a much quicker RPM rise. Also, my flappy was not functioning at the time, and it is now. So basically, it feels like I have a new machine after all these fixes/changes. You will gain very little if any power by advancing or retarding the cams, you will just move the power band around a little bit.

Mike
1987 S4 Auto

Jim R.

I have very good results with the cams degreed in to "0" with the factory dial indicator. Took quite a while to get it perfect, and mine were off by quite a bit due to changing cam gears. Porken's cam timing tools were real close to matching the factory dial indicator method (within a degree or so). I think tolerances in the cams, spider gears, and timing tools make up the differences, but I now have my reference marks for my cams, spiders, and tool set for any future changes. Just need more time to adjust, dyno test......much more fun to just drive it!

Jim