Value added for the Howell/GM EFI

[Matt Colie]

> I agree the howell is a better system, but just for the record the fitech also allows distributor control, just with a smaller matrix. It allows
> the use of a modern msd distributor. Mine is setup that way.
>
> Not arguing, just posting so that if someone else reads they know that fitech also does control timing if you set it up that way.

Justin,

I have just been perusing the Fitech documentation and looking at the timing profile. It does not mention a knock sensor input.

Did I miss something or do they not make timing corrections?

Matt

--
Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan
OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Twixt A2 and Detroit

 

[justin brady1]

Matt,
You didn't miss anything, there is no knock sensor with the fitech.
I've read a lot of discussion on the subject and the general consensus seems to be that knock sensors really don't work well unless they were
engineered into the engine to begin with ( I'm quite certain you're more knowledgeable than me in this area!)

The Fitech uses a simple 3x3 matrix for the timing, and is not intended to be used for lean cruise like the EBL.
It's simply an upgrade to a worn out distributor and is easily adjustable.
I based my timing numbers on Dick Patterson's graphs for his dizzys.

--
Justin Brady
http://www.thegmcrv.com/
1976 Palm Beach 455

 

[jim kanomata1]

Justin,
Your correct about the pro and con of the knock sensor.
I still have a old MSD Knock sensor I use on my Cad 540 .
Depending on location and different part #, I have been coached by couple
people.
I do believe in the theory that you cannot always hear preignition.
Hopefully I will get some people to test location and part # for use on the
403/ 455.

> Matt,
> You didn't miss anything, there is no knock sensor with the fitech.
> I've read a lot of discussion on the subject and the general consensus
> seems to be that knock sensors really don't work well unless they were
> engineered into the engine to begin with ( I'm quite certain you're more
> knowledgeable than me in this area!)
>
> The Fitech uses a simple 3x3 matrix for the timing, and is not intended to
> be used for lean cruise like the EBL.
> It's simply an upgrade to a worn out distributor and is easily adjustable.
> I based my timing numbers on Dick Patterson's graphs for his dizzys.
>
>
> --
> Justin Brady
> http://www.thegmcrv.com/
> 1976 Palm Beach 455
>
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502