i was idleing synch 70% of time. that was with FP at 20 lbs. and i believe i was forcing synch as that .bin was provided to me by another forum member to allow. i recently upped FP to 25 lbs as WOT A/F is 13+/1 under heavy load. the idle now surges more so.

those values no longer disallow asynch at idle nor light cruise since i upped FP. i compared to a stock .bin last night . in constants i saw what i "recall" is MAX ASYNCH PW i think was 1132 usec in stock EBL.bin vs my 262 value in my ron.bin. at MINIMUM ASYNCH PW stock was like 600 and mine was like 540. this is from memory. would these values disallow asynch?

is it possible to allow "synch" only at idle? or does one need to run it 100%? either/or?

does asynch allow more fuel in PE? if so then i need to revert to stock settings as i am at 103% DC for a brief split sec at WOT at 25 lbs FP.

still considering a mechanical issue(fuel filter clogged?).

 

You'll want to leave these values alone: MAX ASYNCH PW at 1132 usec in stock EBL.bin, and MINIMUM ASYNCH PW stock was like 600.

To have sync only at idle there are 2 other values to change. Off hand I can't recall the names. They are something like max PW to exit async, and min PW to enter async mode. I'll post the exact names later.

RBob.

 

i recall seeing those.

max PW to exit async. so will exit asynch when PW large enough? so i reduce this to allow it to exit on smaller-shorter PW?

min PW to enter async. so to prevent it entering i set threshold again low.

now does this anyway affect PE? i thought if the commanded PE(12.7) cannot be attained (like me at 13.3/1 on WB) it will use asynch to enrichen. or can asynch only remove fuel by firing inj every other dist pulse or every third DRP?

edit: are my assumptions accurrate?

 

Here they are:

INJ - Async transition Hi
INJ - Async transition Lo

Set both of these values to 0. That will prevent async mode. Async mode is the firing of the injectors every 12.5 msec, regardless of DRPs. Won't make up for PE or anything like that.

The picture is the injector bias values I use with the 81#/hr at 22 psi (INJ - Injector Correction offset).

Also make sure these 4 values are set to the max values (6,375 RPM & 100 KPa):

INJ - Low RPM to Exit High Load ASync
INJ - Low MAP to Exit High Load ASync
INJ - High RPM to Enter High Load ASync
INJ - High MAP to Enter High Load ASync

RBob.

 

THANKS !

 

Ron,

The bin I sent you should already have these set.

 

Dom: i carefully did the compare. i recall it was sent to me as rons925.bin. based upon my compare it did not have the same info as provided in this thread.

specifically:
INJ - Async transition Hi
INJ - Async transition Lo
not set to zero.

Ron's earlier comment: those values no longer disallow asynch at idle nor light cruise since i upped FP. i compared to a stock .bin last night . in constants i saw what i "recall" is MAX ASYNCH PW i think was 1132 usec in stock EBL.bin vs my 262 value in my rons925.bin. at MINIMUM ASYNCH PW stock was like 600 and mine was like 540. this is from memory. would these values disallow asynch?

but who knows i could have fubar'ed it too?


last night i did just that along with the attempt to command a richer stoich.

successful in getting "synch" only. car runs much better. surge is greatly reduced in idle and in light cruise. it is surging ever so lightly but still surging. maybe will never be smooth for other reasons.

with the surge i am seeing rpms move from 700-900(commanded 850) and holding. timing moving slightly 17-19 or so. synch PW 1.25 to 1.55 or so. the surge directly related to change in pulse width. IAC shows zero steps. WB reflects the change in PW.

 

The slight surge may be from the VE% values around idle, or the proportional gains. For the proportional gains there is another thread, I'll see if I can find it.

RBob.

{edit: here is a thread on proportional gains:

https://www.thirdgen.org/forums/diy-...highlight=gain

Funny that when I use 'proportional' as the search keyword nothing is found. But when using the keyword 'gain' a whole list comes up. Maybe I need to start using shorter words in my posts }

 

INJ - async transition hi
INJ - async transition lo

INJ - Low RPM to Exit High Load ASync
INJ - Low MAP to Exit High Load ASync
INJ - High RPM to Enter High Load ASync
INJ - High MAP to Enter High Load ASync

What addresses are these located in the 7747 and 8746 ecu files?

 

They are not in the '7747 & '8746 ECU's.

RBob.

 

Ron,

Here's the compare I just did with your 9.25 bin and the mod I sent labeled 9.25a. Asynch was set to 0msec which was how I disabled Asynch in my bin.

 

Thanks Dom.

I am currently in "synch" for idle per WU. seems a necesssity. pretty much eliminated surging. stays 1.3 msec. still have not run VAFPR but will soon as I get my programs on new laptop.

edit: right now without tuning/logging program availability i feel like a duck out of water. but i can gaze in wide wonder at those 12 inch wide wheels hanging out of the wheel wells !

edit again: I must have looked at the wrong 925.bin when i posted that 10/2006. sorry.