FBO HRR 688 ECU

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    Author Topic: FBO HRR 688 ECU  (Read 2276 times)

    Offline dsburch

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    FBO HRR 688 ECU
    « on: April 02, 2015 - 01:38:16 PM »
    Well, I finally gave up waiting on the other brand, and went with the FBO HRR 688 ECU with Rev limiter.  This unit is matched with a Mopar electronic distributor, Pertronix 40111 epoxy-filled coil, and a jumper across the resistor to provide 12v to the coil.   If you look up old-fashioned coil output roll-off at mid-rpm, the higher voltage set-up should make a difference.  So far, just with normal driving (383 / 727 / 3.55's) this is a very worthwhile mod.  Starts quicker, idles stronger, and generally runs smoother.  I also gapped the plugs out to .040 and I am pretty sure, by a reduction in exhaust smell, that this is a better burn.  The idle is both a stronger lopey pop and smoother too.  It just seems like the motor appreciates the smoothing algorithm in the modern unit.   That's today's report... back to you, controls... 
    « Last Edit: April 02, 2015 - 01:46:37 PM by dsburch »
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    Offline Mc MOPAR

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    Re: FBO HRR 688 ECU
    « Reply #1 on: May 13, 2015 - 03:52:45 PM »
    I just purchased the same coil hoping it will help my hot starting issue that I’ve been having.  When you say a jumper across the resistor, did you simply bypass the ballast resistor?  Also what spark plugs are you running?
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    Offline tman

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    Re: FBO HRR 688 ECU
    « Reply #2 on: May 13, 2015 - 05:08:12 PM »
    Curious, did you ask for the epoxy filled coil?  Normally it comes with the oil filled one #40011 or did you separately order the epoxy one? 
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    Offline Mc MOPAR

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    Re: FBO HRR 688 ECU
    « Reply #3 on: May 13, 2015 - 05:50:31 PM »
    I ordered the epoxy filled coil.
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    Offline cudabob496

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    Re: FBO HRR 688 ECU
    « Reply #4 on: May 13, 2015 - 07:11:09 PM »
    Quote from: Mc MOPAR on May 13, 2015 - 03:52:45 PM
    I just purchased the same coil hoping it will help my hot starting issue that I’ve been having.  When you say a jumper across the resistor, did you simply bypass the ballast resistor?  Also what spark plugs are you running?

    I had hot start problems, and putting small holes in my throttle blades solved it.
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    Offline dsburch

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    Re: FBO HRR 688 ECU
    « Reply #5 on: May 16, 2015 - 10:00:21 AM »
    No, I had already ordered the 40111 otherwise.  Tried it and it was working fine with the low-voltage resistor path, but not a lot of difference noticed.  FBO sells the oil-filled 40011, but I wanted a horizontal mount.  (Lesson learned from years ago - how to fry a nice oil-filled coil).  Bob said will work fine, and it's working great.  :working:
    « Last Edit: May 16, 2015 - 10:11:50 AM by dsburch »
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    Offline dsburch

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    Re: FBO HRR 688 ECU
    « Reply #6 on: May 16, 2015 - 10:08:48 AM »
    Interesting hot start approach.  Now I remember hearing about it, in some vague mental file too old to recall when it could be useful.  So the effect would be letting more hot air out of the warming manifold?  ...Do you think that works with a stock-style 12" air filter setup?  That's a big motor....what size holes did you use? 
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    Offline dsburch

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    Re: FBO HRR 688 ECU
    « Reply #7 on: May 16, 2015 - 10:22:25 AM »
    FBO delivers the HRR 688 with a bladed jumper wire and adapter post for each side side of the resistor.  It just adds a wire across the resistor, leaving the rig looking mostly stock, if that's important. 

    My plugs are RJ12Ys.  MP alum dual plane, coated headers, and 180 tstat - always a bit cool on the factory sensor/gauge, even summer with (sanden) a/c it's been well under control.  Why mention the manifold and headers when they are not water-routed?... I'm pretty sure they scavenge heat off the iron pretty efficiently. 

    I've hit the hot start issue many times, not so much with this motor.  My warm engine start approach has always been in line with the - get this - the factory owners manual instructions - when hot, open throttle slightly when starting. Usually a fairly quick fire.  Haven't hit hot weather driving yet this year, but will soon, and I'll report back on whether or not I sense a difference with the improved spark. 
    « Last Edit: May 16, 2015 - 10:27:46 AM by dsburch »
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