im pretty sure an electronic dizzy should solve the problem, and locking your dizzy will work but you loose power and loose fuel effieciecy from it. with your question can you turn it down...your talking about the advance right.... you can retard your dizzy all you want but your vaccuum advance will kick in as soon as boost comes on and it will shoot the advance up like 30-40 odd degrees (thats when mr big bang happens) so basically all you have done is make your car really slow before boost and a time bomb on boost. you need to adjust the amount of vacuum advance by filling a bit in inside the dizzy. i cant really say how much to fill in because its differnt for different boosts.

the pump that i had was a carter black low pressure my new carter black high pressure and regulator will be hear tomorrow or thursday. with the return line ,on the passanger side theres a line with a valve with rubber hoses coming off of it that looks like it goes back to the tank could i use this as the return or not. with locking the dizzy how do you go about doing that and do you still use the vaccuum advance , when i put the turbo on i disconected it anyway

the line on the passenger side is some sort of vent line could i use this for the return line or not. and how do you go about lockin the dizzy

Quote:
The vacuum advance part of the distributor comes into play when the manifold is in VACUUM [off boost with some throttle on]
That's why it's called 'vacuum advance'. It will do absolutely nothing when in boost in a blow-through system like this.
With boost, the diaphragm is being pushed to the 'at rest' [retard] position.
Naturally, any mechanical advance will still function as before as it is unaffected by manifold pressure & is best locked out.

The "electronic" part of an electronic distributor is simply the switching method. It switches the current flow to the coil electronically
instead of mechanically [points] & it will still have a mechanical advance function like the points type distributor that it replaces.

There is a place in Queensland called Diaphragm Services [I think] that can build a suitable vacuum/boost advance unit that
will give both boost retard & vacuum advance.

Useful Link

With a blow through system & a conventional fuel pump, electric or mechanical,, the pressure inside the carb is trying to push the fuel back down the fuel line.
If the boost pressure is equal to, or greater than the pump pressure, then the fuel will cease to flow at all.
Fuel pressure must always be slightly greater than the pressure over the fuel in the bowl & this difference in pressure should remain as constant as possible.
This is the function of the rising rate regulator.

can some one please give me some guidance with locking the dizzy please

cheers
Harley

don't bother locking the dizzy. unless it's drag race only then it'd just be a waste of fuel/power at normal driving. what they mean by "locking" the dizzy is eliminate the mechanical advance, you do this by welding or bending the advance together so it does not work anymore. but your much better off with a boost retard system fitted to the dizzy instead. on my turbo vw i used a vaccum can which can retard and advance the timing. this way i have normal timing when light throttle and cruising, with zero boost, then when boost comes on it retards the timing, so no detenation. simple