Too much timing?
Thread Starter
Racer
Joined: Jul 2008
Posts: 250
Likes: 6
UPDATE - I made a limiter out of mine too and it STILL was doing the same thing. I moved my vacuum line from manifold vacuum to ported vacuum and now it seems to work fine. Would the vacuum not be the same at part throttle regardless of whether you used manifold or ported?
Racer
Joined: Sep 2011
Posts: 444
Likes: 35
From: Michigan
What is a Lars gizmo?
I have the same problem. No matter where I set my initial/mechanical timing my cruise timing (vac can and I like the throttle response of an aggressive timing curve) goes way too high and I get partial throttle ping. Lars makes a vacuum timing limiter and I'm waiting on his reply to get one.
Right now I'm running without vacuum advance and it's fine. The only issue doing that is a decrease in gas mileage and it runs 10 to 20 degrees hotter depending on OAT. I don't want to run without vacuum advance over the summer so I'll install Lars gizmo. I thought about getting an adjustable can but I don't trust them just as you are finding out.
Right now I'm running without vacuum advance and it's fine. The only issue doing that is a decrease in gas mileage and it runs 10 to 20 degrees hotter depending on OAT. I don't want to run without vacuum advance over the summer so I'll install Lars gizmo. I thought about getting an adjustable can but I don't trust them just as you are finding out.
Team Owner
Joined: Jun 2001
Posts: 23,367
Likes: 1,061
From: Virginia USA
He sells a vacuum advance limiter that limits the vacuum can advance to 10 to 12 degrees. So if you have 36 mechanical your total advance with vacuum advance is limited to 48. You install in in your distributor so no matter what can your using it's limited to 10/12 degree.
Pro
Joined: Nov 2008
Posts: 542
Likes: 3
From: Bloomfield Hills MI
I Installed an MSD tach drive distributor and changed my advance vacuum 'can' to a unit that required more vacuum. Fixed all my detonation issues at throttle. I either HAD a B2 can or changed it to a B2...cannot recall. I may not be getting every ounce of HP goodness, but I know I can't hurt my car.
Last edited by spinadog; May 5, 2017 at 08:52 AM.
