749 ( typhoon ) Code in a 730 ECU with a V8

[chetwagner at uswest.net]

I have just recently completed a conversion using the 749 code in a 
730 and used it on a 4 cyl. engine.  There were a few things that 
hade to be changed, both in wiring and code.  Let me know what 
you want to know about I did and I should be able to help.

On 18 Oct 2000, at 14:44, Gorden Jennings wrote:

> Hi All,
> 
> Has anyone gotten this to work on a v8, yes I have read the archives and I
> did not see a successful reply, but may have missed it. I am having problems
> getting this to work. I have set the cylinder number to 8 in the Ty code. I
> am using the memcal that the anht code came in so my cylinder select should
> be OK from a code and hardware point of view. This is a 406 SBC V8 that we
> installed TPI using the 730 with the anht code, this worked great. Then a
> Paxton supercharger was installed and we started to tune for it and found
> out the rising rate fuel regulator from Paxton would not keep consistent
> pressure as it was restricting the normal fuel regulator, one day would be
> 42 psi static and the next day may be 38 the next 40. Trying to tune the
> lower end of the scale was becoming a problem. We decided to run the ty code
> as I have one and have tuned them for my friends also. Installed the code
> with the appropriate changes so it would work on a V8 onto the 730 ECU and
> it would not idle, start then sputter and then die. This would happen no
> matter where the bpw constant was set. I then took my 749 ECU out of my ty
> and got the same result so I do not feel it is ECU related. The anht code
> seems to tickle an area of the code that has to do something with the timing
> of the code and the Ty code does not. I have just started to trouble shoot
> this problem and was looking for any insight from the list to what direction
> I should take. 
> 
> I also have a question concerning the register at location 3ffc. I noticed
> the anht code sets this register value to fb1a and the Ty code set this
> register to eb1a. Does anyone know what this one bit difference represents?
> Thanks for any replies you may have.
> 
> Regards
> Gorden 
> 
> > -----Original Message-----
> > From: owner-gmecm at diy-efi.org 
> > [mailto:owner-gmecm at diy-efi.org]On Behalf
> > Of Carl Ijames
> > Sent: Tuesday, October 17, 2000 8:34 PM
> > To: GMECM mailing list
> > Subject: Re: GN injector offset
> > 
> > 
> > > Would any of you who are familiar with the GN PCM/bin care 
> > to tell me
> > > if it includes an injector offset vs. battery voltage 
> > table?  I'm using
> > > a set of stock GN 30lbers (0 280 150 218) in my LT1 and 
> > wouldn't mind
> > > updating this data in the LT1 PCM if its readily available.
> > 
> > It has both injector offset ($34C1) and pump compensation ($34D3) vs. 
> > battery voltage tables.  The pump comp table is a multiplier 
> > but is all
> > ones.  The inj offset is in msec and gets added to the calculated ipw:
> > 
> > Volts   Offset, msec
> >  0.0     7.78, N=E*32.768 so 7.78=$FF
> >  1.6     7.78
> >  3.2     7.78
> >  4.8     7.78
> >  6.4     7.78
> >  8.0     3.3
> >  9.6     2.0
> > 11.2     1.5
> > 12.8     1.07
> > 14.4     0.82
> > 16.0     0.64
> > 17.6     0.46
> > 19.2     0.46
> > 20.8     0.46
> > 22.4     0.46
> > 24.0     0.46
> > 25.5     0.46
> > 
> > In the tech area of www.gnttype.org there is an Excel spreadsheet with
> > most of the data tables, and a disassembly listing with comments.
> > 
> > -- 
> > Regards,
> > Carl Ijames     ijames at netaxs.com
> > 
> > 
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