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Re: Hemi ignition
[Re: mercman1]
#1956952
11/24/15 05:28 AM
11/24/15 05:28 AM
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Joined: Aug 2003
Posts: 43,307
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,307
Bend,OR USA
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Before you go changing out parts try re gapping your plugs. My 540 inch hemi was doing the same thing with full MSD ignition with the plugs gapped at .040. Re gapped to .030 problem gone.  I use to run .090 with my old NHRA Hemi A/S car with a MSD 404 B ignition and Malllory 28880 coil, never missed a beat up to 7000 RPM when valve float would start to rear it ugly head  OP, whay ECU part # do you have from FBO? Maybe it has a built in RPM limiter in it  Check the total timiing at and above 4500 RPM 
Last edited by Cab_Burge; 11/24/15 05:29 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Hemi ignition
[Re: Dr Dave]
#1957396
11/24/15 11:23 PM
11/24/15 11:23 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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rotor phasing. condition of plugs and plug wires. My SWAG "sub in a non FBO box & if no luck then sub in a non FBO coil". pickup coil might be a possibility (check the reluctor gap also)
live every 24 hour block of time like it's your last day on earth
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Re: Hemi ignition
[Re: Dr Dave]
#1960064
11/30/15 01:26 AM
11/30/15 01:26 AM
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Joined: Jul 2003
Posts: 12,129
Cleveland
sunroofgtx
I Live Here
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I Live Here
Joined: Jul 2003
Posts: 12,129
Cleveland
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528" Hemi with the new FBO control box, phased dizzy and matching coil, new wires. The motor begins to break up around 4500 rpm. Spoke with Don about it and he said it was due to interference with my old Sun tach. I disconnected the tach without any improvement.
What do you recommend for a good ignition system; Pertronix in my existing distributor, MSD Ready to Run, Fire Core??? I was thinking it would be of benefit to run a stock type of system in the event something breaks down and your in some small town, stock parts would be available.
thanks! Give me a call. We can go over some options. I suggest first of all, a call to R/T Garage. Troy will shed a lot of light.
Join the quickest team in motorsports. Team FireCore. CustomWiresets.com
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Re: Hemi ignition
[Re: mattsmopars]
#1973167
12/20/15 11:25 AM
12/20/15 11:25 AM
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Joined: Jul 2003
Posts: 5,180
upstate western ny
sogtx
master
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master
Joined: Jul 2003
Posts: 5,180
upstate western ny
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Never take for granted that new parts are correct out of the box and I know that doesn't make since. I had a FBO ignition kit done for a big block coronet I had. After a lot of trouble including a blown head gasket. I started to check the distributor phasing and it was off quite a bit. When I would put it up to were number one should be it was almost to the next plug. So I tore the new distributor apart to try to find the problem. What I found was no pin to locate the reluctor wheel and it had slid around on the distributor shaft. Once I got the head gaskets replaced and the distributor fixed I never had any other issues. Not running anyone down with this post, possibly just a over site that can happen but it made me really start to look at everything that I buy now.
I have always had very good luck with MSD ignition products. I have also heard good things about firecore products including there distributor. I have personally used his plug wires and really liked them plus he is a member here. Good luck with your car.
Matt Ill run fbo down I think fbos dizzies are rebuilt in taiwan or a methlab, not sure Mine was not plug and play either a while back , it wouldnt have been so bad had he treated me like a human after the sale. The firecore guy will help you out after your purchase .. 
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