Mopar Muscle Association UK

The Dart ran a faster 60ft with more igntion timing (thanks to GTX Jim and Adam for the advice); but it would seem that this is too much at the 330 foot and 1/4 mile points as both were down on the previous best by about 3 mph.

The MSD6 digital has the ability to retard the ignition timing by applying 12 volts to one of the input leads.

However, I am not sure on the best way to achieve this. The obvious answer is yet another manual switch, but I consider this unreliable and inconsistent.

Also it is not easy to fit a micro switch to the Fairland shifter as it is a bit "old school". I do not think fitting one on the carb is a good idea either.

Does anyone have any suggestions on either an rpm-linked device, or a timing-related device that would work with the MSD6 D set up.

I have not found anything on the MSD site as yet.

Thanks in anticipation

Pete

Timing curve Pete. You don't need fancy electronics.

Forgot to mention - running locked out timing.

Anyway I cannot see how re-curving the ignition can make it retard, only advance at a different rate...

By my reckoning, I want 40 Degrees of initial timing, reducing to 34 - 36 degrees at high rpm.

I know its a lot but it works with a big cam, etc....

Its running on C12; don't try this at home kiddies...

Pete
No disrespect to anyone here but you might be better asking this question on the moparts race section, there's a lot of very knowledeable people on there.
Mick

MSD boost timing master? used by the turbo boys to avoid detonation.

You runnin nitrous Pete?

The only way to tune the motor is to plug chop @ the end of run , this will tell you what the motor wants , if your changing the octane rating or heat range on plugs then this will require pulling or adding spark lead.

No reason to add or pull timing above 3000 rpm (na) , unless you wanna risk totaling the motor or runnin slower the motor does'nt see below 3000rpm , that's why you've locked the timing out.
If there are gains to be had by adding/pulling timing above 3000rpm on a na run then the motors not set up correctly to start with. nitrous run motors have to pull timing due to increased cylinder pressures/heat & faster burn rate , to avoid detonation/preignition.

The motor wanted another 2/3* of spark lead & fattening up , i take it you leaned the motor the previous time @ the Nats due to the air quality bein poop..................did you pull the plugs after the next run @ take a look?

The MSD6 digital is a two step controller , the purple & blue wires are usually grounded to the nitrous solinoids , so when the solinoids are activated the box will pull timing to whatever is set on the soft touch. . The digi 6 box is normally used for nitrous/boosted applications or when running a trans brake , NA motors don't use the step retard facility for timing control above 28/3000 rpm , although the start retard function is useful when your running locked out timing , i like the anti theft device on em too


40* spark advance? maybe bleeding off too much cylinder pressure , try backing off the lash next time out.

Mick wrote:Pete
No disrespect to anyone here but you might be better asking this question on the moparts race section, there's a lot of very knowledeable people on there.
Mick

Mick , i know of a few on here that would run rings round most guys but they don't share there info.

Posted twice

Good Post Adam. I have already closed the lash

Will have to go and have a think........

Well the spec of the set-up might have helped...

Sorry but needing less timing at a higher rpm must mean something is not right. There must be a change in mixture quality or valve timing/sealing.

Open the lash Pete , trick the motor into thinkin it's running a smaller cam , 40* seems high , closing the lash will bleed off more cylinder pressure.

With you now, Adam.

Or I could build a new engine

I think this one is done, I am trying to shave 100's of a second off now; all the big gains have been made.

Dave wrote:Well the spec of the set-up might have helped...

The spec has nothing to do with the remedy I was asking about......

I read your question as "more initial timing" and not "I only have initial and that's it".