| [GMCnet] FiTech looks like the real deal [message #292384] |
Thu, 17 December 2015 17:05  |
glwgmc
Messages: 1014
Registered: June 2004
Karma: 10
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Senior Member |
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My understanding is the FiTech ECU spark control requires a simple two wire locked out distributor rather than a locked out HEI distributor. If you are using the distributor for spark control the stock GMC MH HEI works just fine and is what two of the techs I spoke with said they would if it was theirs. Not because their ECU spark control doesn’t work well, but because the HEI works just fine for our application according to them.
Others know a lot more about spark control than I do, but my understanding is a knock sensor allows for more aggressive advance without the risk of pre-ignition (as long as it is working properly) and that more aggressive advance can lead to increased performance under some conditions.
Jerry
Jerry Work
The Dovetail Joint
Fine furniture designed and hand crafted in the 1907 former Masonic Temple building in historic Kerby, OR
glwork@mac.com
http://jerrywork.com
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Message: 10
Date: Thu, 17 Dec 2015 15:13:28 -0600
From: D C _Mac_ Macdonald
To: GMC Mail List
Subject: Re: [GMCnet] FiTech looks like the real deal
Message-ID:
Content-Type: text/plain; charset="Windows-1252"
Is it true that FiTech won't work with the later (late '76 and later) ignitions?
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Jerry & Sharon Work
78 Royale
Kerby, OR
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| Re: [GMCnet] FiTech looks like the real deal [message #292389 is a reply to message #292384] |
Thu, 17 December 2015 17:53  |
GMC.LES
Messages: 505
Registered: April 2014
Karma: -2
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Senior Member |
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A bit OT
With all this discussion on knock sending ignition systems and its advantages, I'm wondering if anyone has done any fuel economy comparisions between regular grade and super grade gasolines on a coach running a KS ignition system?
Higher octane should permit more timing, which in turn should deliver a bit more economy. Any chance the improved economy might come close to offsetting the additional fuel cost?
I guess this might be best placed as a new topic.
Les Burt
Montreal
'75 Eleganza 26'
The EWIP (Eternal Work In Progress)
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