Advance CAM Timing (who's done it?)
#1
Rennlist Member
Thread Starter
Advance CAM Timing (who's done it?)
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?
Ken had mentioned 2-3 degrees for 32V, but who's actually done it?
#3
Rennlist Member
Thread Starter
Hi Andrew,
If everything goes right, Tony will stop by Thur and we'll give the porken tool a try
If everything goes right, Tony will stop by Thur and we'll give the porken tool a try
Originally Posted by Andrew Olson
I was just thinking about you... glad to see you're working on it. Sorry I can't answer our question though.
#4
Rennlist Member
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.
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.
#5
Rennlist Member
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.
jp 83 Euro S AT 50k....with Porken tool in readiness for next belt.
#6
Inventor
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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.
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.
#7
Three Wheelin'
Originally Posted by 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.
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.
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#8
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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
jp
#9
Chronic Tool Dropper
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Remember that we are talking about valve timing here, not ignition timing.
#10
Rennlist Member
Originally Posted by 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!!!!
#12
Addict
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Originally Posted by Kevin Michael
Wouldn't the AutoThority chips give the 3 deg. via the ezk? On the 85-86 anyway.
#13
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Originally Posted by Kevin Michael
Wouldn't the AutoThority chips give the 3 deg. via the ezk? On the 85-86 anyway.
Originally Posted by dr bob
Remember that we are talking about valve timing here, not ignition timing.
#14
Rennlist Member
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
Mike
1987 S4 Auto
#15
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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
Jim