Help needed from the engine tune wizards re optimum EGT temp.

[heinz wittenbecher]

I'm adding a Variable Injection Controller to the Rance ported fuel
injection. This will allow setting each individual injector instead of the
bank firing currently used.

What brought this about? When I removed the headers for the installation of
the EGT probes I had some cylinders that were quite sooty compared to the
rest of them.

As I now have accurate EG temps available I should be able to tune for best
individual results rather than some rich just to assure none are too lean.

The question: How much cooler than peak EGT should a 455 cylinder be running
at? or should it run at peak. The only reference I have is dulled by time
. I think I remember correctly that we used to run peak +50 or so when
leaning manually in my flying days.

Thanks in advance

Heinz

 

[zachary zehnacker]

Heinz,

I think you are getting into the fuel injection far enough to warrant
subscribing (or at least checking out) the Do It Yourself Fuel Injection
mailing list. They have good searchable archives of their informative
mailing list. They have a web site at
http://efi332.eng.ohio-state.edu/diy_efi/ . Someone there should know the
answer. If not, I would guess that someone on the Olds mailing list might
be able to supply you with the info.

Zak

>I'm adding a Variable Injection Controller to the Rance ported fuel
>injection. This will allow setting each individual injector instead of the
>bank firing currently used.
>
>What brought this about? When I removed the headers for the installation of
>the EGT probes I had some cylinders that were quite sooty compared to the
>rest of them.
>
>As I now have accurate EG temps available I should be able to tune for best
>individual results rather than some rich just to assure none are too lean.
>
>The question: How much cooler than peak EGT should a 455 cylinder be running
>at? or should it run at peak. The only reference I have is dulled by time
>. I think I remember correctly that we used to run peak +50 or so when
>leaning manually in my flying days.
>
>Thanks in advance
>
>Heinz
>

 

[heinz wittenbecher]

Thanks Zak,

I'll take a meander over there. Seems last time I did I felt it was more for
builders of EFI vs just users.

Heinz

- ----- Original Message -----
From: Zachary Zehnacker
To:
Sent: Tuesday, March 02, 1999 6:32 PM
Subject: Re: GMC: Help needed from the engine tune wizards re optimum EGT
temp.

>Heinz,
>
>I think you are getting into the fuel injection far enough to warrant
>subscribing (or at least checking out) the Do It Yourself Fuel Injection
>mailing list. They have good searchable archives of their informative
>mailing list. They have a web site at
>http://efi332.eng.ohio-state.edu/diy_efi/ . Someone there should know the
>answer. If not, I would guess that someone on the Olds mailing list might
>be able to supply you with the info.
>
>Zak
>
>
>
>

>>I'm adding a Variable Injection Controller to the Rance ported fuel
>>injection. This will allow setting each individual injector instead of the
>>bank firing currently used.
>>
>>What brought this about? When I removed the headers for the installation
of
>>the EGT probes I had some cylinders that were quite sooty compared to the
>>rest of them.
>>
>>As I now have accurate EG temps available I should be able to tune for
best
>>individual results rather than some rich just to assure none are too lean.
>>
>>The question: How much cooler than peak EGT should a 455 cylinder be
running
>>at? or should it run at peak. The only reference I have is dulled by time
>>. I think I remember correctly that we used to run peak +50 or so when
>>leaning manually in my flying days.
>>
>>Thanks in advance
>>
>>Heinz
>>
>
>