EST Problem.

[Eric Aos]

> -----Original Message-----
> From: Richard Wakeling [mailto:kojab at ar.com.au]
> Sent: Monday, March 15, 1999 3:47 PM
> To: gmecm at efi332.eng.ohio-state.edu
> Subject: EST Problem.
> 
> 
> Hi All,
> 	Have been stuck on a problem for a few weeks now. I 
> cant find the
> answer for it.
> 	I am trying to modify a V8 memcal BFPM (256K Eprom) to 
> run in my 4
> cylinder Toyota. The BFPM is one of the high speed (8192) 
> ALDL programs
> used in Australia.
> 	The problem is when I change the "Static Advance Angle" 
> from 60 deg
> (0xAB) to 10 deg (0x1C) to suit the 4 cylinder distributor I then dont
> get any EST change (no adva. ALDL Data shows normal spark advance
> but on the Test bench and in the car there is virtually no 
> Advance. If I
> use a hex value closer to AB I then begin to get the Advance back but
> the Static Advance Angle is then incorrect.
> 	I have spent considerable time trying to overcome this 
> problem and it
> would appear that the hex Loc I am changing gives the 
> impression that it
> is the byte for "Max advance allowable" but I am sure it is not as it
> does change the Static advance angle.
> 	I had previously modified the triger point on the 
> toyota distributor
> for different Static advance angles but if I use the 60 deg
> position as with the V8 I do get normal advance but the idle is very
> poor and I would suspect that this is due to the fact that the
> injectors  are now opening 50 deg earlier.  
> 
> 	Appreciate any help
> 
> Cheers Richard.
> 

I didn't figure this out, Ted did. here's what he did:
 
>So to sum up:  You adjust KMAXRTRD2 to 70 and KREFANGL >to 70, and then
EST
>signal comes in sync with the DIS module and everything >SEEMS to be
working.
>
>Ted
>
>PS   The 70 degrees comes from:  60degrees is how far >the reference
pulse is
>off  PLUS 10degrees is how far advanced the DIS is in >EST BYPASS mode
for a
>total of 70degrees.