[Gmecm] 749 Shift light output

[Bill Shaw]

This sounds like what I'm looking for.  I'll have to burn an eprom and 
give it a shot on the bench.  I found a fuel leak on my 4.7L last 
night,  so it's down until the new engine is ready.

Thanks Robin, Mike, Zaphod & Mitch. 

Bill

Robin Handley wrote:
> FWIW I'm using the Sunbird code (that ran on the '749) and configured 
> the shift light to always come on above a set RPM by setting the value 
> of EPROM memory location $013E (where $0000 is the address of the 
> first byte in the EPROM).
>
> 4000 RPM is a valid value for this. I've successfully tested it at 2000.
>
> HTH
>
> Robin
>
> ----- Original Message ----- From: "Bill Shaw" <b.shaw at comcast.net>
> To: <gmecm at diy-efi.org>
> Sent: 26 February 2007 23:28
> Subject: [Gmecm] 749 Shift light output
>
>
>> I've just obtained a 32 valve 5.0L engine for my 928.  This should 
>> give me about 90 hp more than my 16V 4.7L before I add the forced 
>> induction.  One issue I have to address with the 32V is the flappy 
>> valve in the intake. This is an intake resonance device that is 
>> normally triggered to open at about 4000 rpm by the Bosch LH ecu.
>>
>> I'm thinking about controlling it with the shift light output on my 
>> '749, but it needs to be modified a bit so that it triggers just on 
>> RPM,  not engine load or anything else.  Has anyone modified the 
>> shift light output on a '749 to be just an RPM trigger?
>>
>> TIA,
>>
>> Bill
>> 928s 4.7L 5 sp. Vortech/749 (soon to be 5.0L 32V!)