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PostPosted: Mon Nov 20, 2017 3:32 am 
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Joined: Mon Jan 05, 2015 8:45 am
Posts: 127
You mean there is something that could use the brand new coils that I bought just before the runoffs so I wouldn't just flush that money down the drain? Interesting! Do you have a part number you could share?

Right now the big conundrum comes down to wiring. Going to individual coil packs (eliminating the wasted spark ignition) will mean rewiring the car (some) to either (2) connectors or (1) with more pins. And, if I am doing that, why would I not move to sequential injectors (versus batch now).

Is there an advantage to moving away from the wasted spark arrangement?

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Bill H
92 Saturn SL2 - SCCA F-Production


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PostPosted: Mon Nov 20, 2017 6:23 am 
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Joined: Fri Dec 23, 2011 6:59 am
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Location: Spring Hill, FL.
NO,IMHO.
Doing what we do and slobbering fuel at low rpm with cams and such , very little if any increase in direct fire control. IMHO.
There may be a tiny bit with adjusting timing to match each cyl max pressure, taking into account hot spots etc. I cant remember detonating the end cyls in my VWs.
IE Smokey ran the center cyls at lower compression than the corners on the SBC for the same reasons.

I'm going to use the GM modules firing PT cruiser/SRT coil packs.

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Mike Ogren/Protech Racing, http://www.FWDracingguide.com http://www.ogren-engineering.com/ 352.428-8983 mogren@tampabay.rr.com


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PostPosted: Tue Nov 21, 2017 6:07 am 
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Joined: Tue Sep 03, 2013 1:03 pm
Posts: 34
Location: Upstate SC near CLEMSON!
Well, IMHO, the Advantages of Sequential Spark are:

1) Four coils vs two- they fire half as often
2) Easier Starting if you have rad cams - why this is I don't know, but it works WAY better with the cams I use
3) No spark plug wires (with our setup)
4) Direct mounting of coils in the cam cover (with our setup) - Easier mounting and it looks neat & tidy
5) Why have the 3X module if you don't use it? All those separate spark and fuel out puts

Notice I didn't mention more power as a lot of discussion goes into that. My tuner thinks there is a small increase to be found.
I also run sequential fuel.

First time we tried sequential, we used LS1 coils. Quit doing that five years ago.

HP


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PostPosted: Tue Nov 21, 2017 6:12 am 
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Joined: Tue Sep 03, 2013 1:03 pm
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Location: Upstate SC near CLEMSON!
[quote="Protech Racing"]NO,IMHO.

IE Smokey ran the center cyls at lower compression than the corners on the SBC for the same reasons.

Hey Mike

My recollection from reading is that Smokey set CR based on temperatures of the individual cylinders. His theory was temp limited CR, each cylinder had a different temp so he adjusted each CR based on that. No mention of things like pressures in his book that I recall.

HP


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PostPosted: Tue Nov 21, 2017 7:48 pm 
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Joined: Mon Jan 05, 2015 8:45 am
Posts: 127
HP:

Thank you for the replies. Was there an issue with the LS1 coils?

How did you select the COP units you are using? Is there a reference that shows the dimensions of the COP? I considered doing something similar (I seem to have the room) but could not find an easy way to select the COP.

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Bill H
92 Saturn SL2 - SCCA F-Production


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PostPosted: Thu Nov 23, 2017 10:52 am 
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Joined: Tue Sep 03, 2013 1:03 pm
Posts: 34
Location: Upstate SC near CLEMSON!
The LS coils required custom wires, ie, GM on one end and Miata on the other, plus they are big and clunky. Doable but a PITA

We had a Suzuki GSXR in the shop - took a coil from it that was laying on the table and stuck it in the Miata - and went "Damn - they fit!"

What fits in other cars is an excellent question for which I don't have info on. As far as the Mazda's go, some folks even use Toyota coils. The bike coils were just much more compact and we thought if they can fire a GSXR at 14,000 rpm, they should work OK in a prod motor at 8,000.

Got a set of LS1 coils with custom factory made magnacor wires made for the miata if anyone is interested.

HP


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PostPosted: Mon Jan 08, 2018 7:34 pm 
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Joined: Mon Jan 08, 2018 7:23 pm
Posts: 2
In the Megasquirt world, go Ign1A coils set a 3ms dwell and never look back. Ls1 coils work good too but are really ugly. Never mount High tension coils anywhere near parallel to low voltage digital control (logic) wires.

https://www.diyautotune.com/product/ign-1a-race-coil/

Also see my http://www.youtube.com/c/AndyWhittle_HowEFIworks for lots more info. or http://www.HowEFIworks.com

Hope this helps

Andy (Whittlebeast) Whittle


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PostPosted: Mon Jan 08, 2018 7:53 pm 
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Joined: Mon Jan 08, 2018 7:23 pm
Posts: 2
Here is my coils mounted on the left. 4 total.

http://www.nbs-stl.com/CrxTypeR/B18C.jpg

http://www.nbs-stl.com/CRX/CRX%20Ignition.jpg

AW


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PostPosted: Mon Jan 08, 2018 7:57 pm 
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Joined: Mon Jan 05, 2015 8:45 am
Posts: 127
Thank you, Andy. The plan is to upgrade to the 1A coils and tune it one those. Need to change some wiring to be able to run 4 coils vs 2.

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Bill H
92 Saturn SL2 - SCCA F-Production


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