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  #1  
Old Jan 31st, 09, 09:00 AM
Camaro55 Camaro55 is offline
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Logan
 
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Default How to adjust vacuum advance

I just put a msd street fire distributor on my camaro and was wondering what that vacuum advance would need to b set at for best performance.
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  #2  
Old Jan 31st, 09, 09:34 AM
Fred Ficarra Fred Ficarra is offline
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Default Re: How to adjust vacuum advance

Vacuum advance is for economy. It does nothing when you punch it. If your vacuum advance is adjustable, and I'm sure it is, go for the most advance you can get and drive it. Don't get on it, just drive legally and see how it feels. You don't want surge and you don't want ping. You want to keep money in your pocket, not give it to the oil companies.
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One owner 69 Camaro,(yep, bought it new)
RS SS Hugger Orange, L88, 4:10's tru-tack posi, ducted hood, Endura, spoilers.
TH400 (CX) with Coan 8" converter, GV-OD, 8 track still on console and best et 10.495, 128.79mph 1.428 60'
All with 1960's stuff. (except tires and converter)
+ MT Super Scavenger headers & 3" full exhaust with X pipe.
1000cfm AED and HD Harold-Lunati SR, 725 lift with shaft rockers too.
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  #3  
Old Jan 31st, 09, 09:44 AM
Camaro55 Camaro55 is offline
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Logan
 
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Default Re: How to adjust vacuum advance

Alright man thanks alot
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  #4  
Old Jan 31st, 09, 09:48 AM
Fred Ficarra Fred Ficarra is offline
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Default Re: How to adjust vacuum advance

You're welcome. Don't forget to report back. We want to know how you like your stuff. Oh, I forgot, be sure to use full time vacuum not ported vacuum.
__________________
One owner 69 Camaro,(yep, bought it new)
RS SS Hugger Orange, L88, 4:10's tru-tack posi, ducted hood, Endura, spoilers.
TH400 (CX) with Coan 8" converter, GV-OD, 8 track still on console and best et 10.495, 128.79mph 1.428 60'
All with 1960's stuff. (except tires and converter)
+ MT Super Scavenger headers & 3" full exhaust with X pipe.
1000cfm AED and HD Harold-Lunati SR, 725 lift with shaft rockers too.
http://epitomesrebuild.com/
http://ss427.net/
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  #5  
Old Feb 1st, 09, 11:25 AM
Steptoe Steptoe is offline
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Steps
 
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Default Re: How to adjust vacuum advance

U have to have the Cent curve set up 1st for best power...best done on a dyno
Then find ..on the dyno at highway cruise, the best total advance.
This will be X degs above the cent
Set the VA at the difference between which will give you a total in the ball park of 42 to 48 deg

U may have a rough idle without the VA because the Cent should be adjusted with the bottom end of the curve around factory spec to around 12 degs...this makes easy start
With the VA adjusted so its activated just below the idle vac , no VA...
The engine turns over easy, fires , the VA kicks in on manfold vac and adds another 10 or 12 degs giving stable idle.
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  #6  
Old Feb 1st, 09, 05:28 PM
Camaro55 Camaro55 is offline
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Logan
 
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Default Re: How to adjust vacuum advance

I dont erally have an idea what my timing should be Im shure it willl run alot better if i ever get the right timing.
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  #7  
Old Feb 1st, 09, 09:08 PM
Steptoe Steptoe is offline
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Default Re: How to adjust vacuum advance

Run a seach in the forums theres a lot of damn good info in here
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  #8  
Old Feb 2nd, 09, 07:58 PM
Camaro55 Camaro55 is offline
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Logan
 
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Default Re: How to adjust vacuum advance

how do u run a search???
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  #9  
Old Feb 2nd, 09, 11:45 PM
Steptoe Steptoe is offline
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Default Re: How to adjust vacuum advance

At near top of the page, taskbar, towards the right is a button "search"
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  #10  
Old Feb 3rd, 09, 09:57 AM
alanrw alanrw is offline
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Alan
 
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Default Re: How to adjust vacuum advance

Try this thread for openers. Make sure you are using manifold not ported vacuum (that seems to be the consensus here).

http://www.camaros.net/forums/showth...egrees+advance

alan
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  #11  
Old Feb 4th, 09, 08:15 AM
Camaro55 Camaro55 is offline
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Logan
 
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Default Re: How to adjust vacuum advance

Alright that thread helped me alot. My big problem is when the timing is to low then it backfires when accelerating, and when i set it up high enough not to backfire my starter drags. Should i get a new starter and set the timing higher?
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  #12  
Old Feb 4th, 09, 09:17 PM
Fred Ficarra Fred Ficarra is offline
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Fred
 
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Default Re: How to adjust vacuum advance

Two thing wrong, back fire and starter drag. Each can have it's own causes. You need to make sure you're timing it 'in the ballpark' and that your starter is strong. (battery system good-to-go.) Hint; advanced timing is good,,,, until it pings,,, or drags the starter. I'd make sure it wasn't lean, before retarding timing.
__________________
One owner 69 Camaro,(yep, bought it new)
RS SS Hugger Orange, L88, 4:10's tru-tack posi, ducted hood, Endura, spoilers.
TH400 (CX) with Coan 8" converter, GV-OD, 8 track still on console and best et 10.495, 128.79mph 1.428 60'
All with 1960's stuff. (except tires and converter)
+ MT Super Scavenger headers & 3" full exhaust with X pipe.
1000cfm AED and HD Harold-Lunati SR, 725 lift with shaft rockers too.
http://epitomesrebuild.com/
http://ss427.net/
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  #13  
Old Feb 5th, 09, 12:15 PM
Steptoe Steptoe is offline
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Steps
 
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Default Re: How to adjust vacuum advance

Quote:
advanced timing is good,,,,
No it is not
Increase Nox emissions, loads the pistons and crank, can colapse piston shirts, and long term damage..over advanced from correct advance at a given RPM you are trying to push the piston back down before it is up.
Think of it like this
If you "under advance" the lead when shooting a running deer you hit it in the rump, and have a few hrs tracking to hunt it down
If u over advance u go in front and miss
Correct advance gives u a head shot instant drop or slightly underadvance a fatal chest shot...and a short walk
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  #14  
Old Feb 5th, 09, 12:59 PM
67SS&99SS 67SS&99SS is offline
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Andy
 
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Default Re: How to adjust vacuum advance

If it is a mild motor, I would try about 6-10* at idle with the vacuum advance disconnected, starting with 6* and working your way up until it idles the best. If it has a larger cam you may want to start at 10 and work your way up to 16* I would do the same thing with fully advanced timing. I would start at 30* and work up to about 36-38* and see were the motor likes it.
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  #15  
Old Feb 7th, 09, 09:28 PM
Camaro55 Camaro55 is offline
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Logan
 
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Default Re: How to adjust vacuum advance

But how do u do the total timeing rev it up to about 3,000rpm and set it or what???
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