09-23-2013 | #51 | |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,709
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Re: Anyone care to guess...
Quote:
No you're absolutely correct. W the 411 you would use those dwell tables. I was musing about our current 9 slot reluctor on the crank, ie just use the current crank signal, ditch the ICM and do some custom code for the stock LT-5 ECM to handle dwell. Still would need something to do the firing sequence which is also a function of the current ICM.
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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09-23-2013 | #52 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,709
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Re: Anyone care to guess...
BTW, have you looked cutting slots into balancer itself? Would ATI do something like that?
Also, I understand some are using the ABS Sensor as a trigger.
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
09-25-2013 | #53 | |
Join Date: Jan 2009
Location: Mandeville, LA
Posts: 340
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Re: Anyone care to guess...
Quote:
I'm looking at several mods. In order of priority, they are: Coil on plug with elimination of the ICM (supposedly, the MS unit can handle this). Electronic Throttle Control. The LS stuff they have now has more cross-sectional area than one of our throttle bodies even after being punched out (don't think the MS unit can handle this). This would also allow for a full implementation of the torque management that is available with these PCMs. Mods to valve train to implement variable cam timing (don't think the MS unit can handle this). This would require moving up to a Gen IV PCM. Dreaming about a split plenum twin electronic throttle body setup w/ one TB feeding the primary ports and one feeding the secondary ports. This would allow the benefits of the primary/secondary setup without the flow restriction of the butterflies in the secondary ports and the problematic vacuum actuated system. Also being able to control the proportion of primary/secondary airflow throughout the load range would allow for tuning of swirl throughout the range for maximum area under the torque curve. I've got other ideas, but these are my primary goals. Jep |
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09-25-2013 | #54 | |
Join Date: Jan 2009
Location: Mandeville, LA
Posts: 340
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Re: Anyone care to guess...
Quote:
I agree that a code rewrite would be able to handle the dwell aspect. I also agree that an external firing sequencer would be required, as the stock ECM does not have enough free digital outputs to handle the task. Jep |
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11-10-2013 | #55 |
Join Date: Jan 2009
Location: Mandeville, LA
Posts: 340
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Re: Anyone care to guess...
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11-10-2013 | #56 |
Join Date: Jan 2009
Location: Mandeville, LA
Posts: 340
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Re: Anyone care to guess...
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11-11-2013 | #57 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,709
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Re: Anyone care to guess...
Very nice Jep. 58 tooth or 24? And there's room in front of balancer in engine bay?
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
11-11-2013 | #58 |
Join Date: Jan 2009
Location: Mandeville, LA
Posts: 340
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Re: Anyone care to guess...
Dom,
24x (for now). Once I get the sensor mount done, I can get the reluctor wheel positioned and pinned. Then I'll balance the assembly (as you can see in the photos, the reluctor wheel is very unbalanced). Jep |
11-11-2013 | #59 | |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,709
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Re: Anyone care to guess...
Quote:
The middle is the most stable spot given the rpm they were looking for.
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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05-18-2015 | #60 |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
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Re: Anyone care to guess...
Whatever happened to this??
and to Jep for that matter!!
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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