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

[timsiford at hushmail.com]

Gordon,

I don't have an answer for you but I will be following your posts closely. 
 I have a friend with a 406 setup that will be running a big turbo.  I am 
interested in how this pans out for you.

tim

At Wed, 18 Oct 2000 14:44:21 -0700, Gorden Jennings <gjennings at extremenetworks.com> 
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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