MSD 6530 with throttle postion sensor

[lippy]

Originally Posted by Morris

Tom

You and I have talked about this a few times .... but all of our Race cars and KMP259 have locked down Distributors and we set the timing at full advance from the start. However we use the MSD Start Retard unit to retard the timing below 800 rpm's..... we retard the timing I think it is 25*degrees ....from 36*degrees.....so at start it's starting at 11*degrees and then goes full to 36*degrees as the rpm's go over 800 rpm's.... this is how we have set all of our race motors and it has worked well for 30 years..... even though we are using a magnetic pick-up on the crank or the distributor on the motor.... but one thing is that we always have a dry sump system so there is no load on the distributor and it can respond freely.... and operating a motor at partial throttle is very important in Road Racing....

I was having a plug fouling problem I couldn't solve, and the solution I eventually found was to use far more initial advance than stock. The two approaches I considered were (1) a programmable MSD box, and (2) a 10 degree bushing from 4secondsflat.com. I went with the bushing because it's simpler. So now I have 26 degrees of initial timing, and 36 degrees at full advance.

Wondering if I'd benefit from pseudo-vacuum advance, through a programmable MSD box either with or without TPS/MAP.