As of tomarow I am going to be out of town for 10 days but wondered if the following looks correct.
The On-Boost is seems to be the most open to change if we find out the solonoid dose close off idle, at 2800rpm, or with boost.
For now it looks like the dist retards with equal signels to each side of the pot.
Quote:
Originally Posted by 911st
Mike and I have been working on some drawings and are posting them for review and approval if we can agree they are correct.
1)Cold start
2)Warm Idle
3)Cruse
4)WOT/On Boost
1) Cold start: shows no timing retard as both connections to the dist are blocked. The Thermo-Valve is blocking any resident boost and Solenoid is blocking intake vacuum. If either signal was to reach the pot, it would retard timing and not let is run a steped up idle. Solenoid bleeds any resident pressure in Pot to atmosphere. Also, AAR is open.
2) Warm Idle: Timing is retarded with combination of small resident boost that might be present from turbo at idle and mostly from intake vacuum.
3) Cruse. Butterfly moves past ported connections. The Boost-Retard side of pot sees vacuum and the Vac-Ret side sees modest resident boost and all retard function is suspended. (If there is any advance function we would see is by reconecting the pot and running up to 4000rpm.)
4) WOT/ On-Boost.
This may need to change. I now believe the dist is constructed so there are two diaphragms. One being the larger Retard diaphragm which can see boost pressure from both sides at WOT. The other being the Seal-Diaphragm that will push toward boost-retard and might be overriding the stalled larger diaphragm for a more progressive on boost-retard.
Thus, we show the no effect from the idle-solenoid. And, on boost we are showing boost to both sides of the pot and --full retard.
This is open for discussion.
Big thanks to Mike/copterdude for the wonderful graphics!!!  |