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Old 10-19-2020, 10:09 PM   #1
242Bleek
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Default B21FT ignition upgrade

Hello. I have an 83 245T with an M47. It has a T3/T4, gold injectors, still K jet (and keeping it that way) running about 18psi. The car runs strong and performs well. However to get it to run that way I had to grind the boost retard stop down in the distributor and set the base timing way advanced, around 28 degrees or so.

As you can imagine this makes the engine act very erratic at idle and low rpms. I would rather be able to set the base timing back to the factory 10-12 degrees and have some sort of ignition system that could advance or retard timing with boost in a linear manor with some level of adjustment. I know about the msd 6btm. That seems like a very dated setup and I don't love the idea of my advance being done by the distributor and the retard being done separately at the ignition module. I figured by the year 2020 there has to be some sort of stand alone ignition set-up that can be fine tuned for boosted cars. Any ideas? Thanks
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Old 10-20-2020, 01:19 AM   #2
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Microsquirt seems like one of the easiest options for what you’re trying to do.
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Old 10-20-2020, 04:46 AM   #3
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This sounds like what you are looking for. Not cheap but super easy to use / tune.

https://123ignition.com/product/tuneplus-4-r-v-b21-b23/
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Old 10-20-2020, 07:23 AM   #4
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Originally Posted by culberro View Post
Microsquirt seems like one of the easiest options for what you’re trying to do.
Agreed.. just use a microsquirt and only use the ignition input and output.. you could do it with maybe a little as 3 wires..
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Old 10-20-2020, 08:54 AM   #5
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it'd be more than 3 wires, but it wouldn't be much. you'd need the map sensor, a 3 wire distributor (or lock out the vr input in the b21 distro, either or), and an ignition module with it's associated wiring. While you're at it, I'd probably hook up other things to at least datalog what you've got, but those would be the minimums. You could do it with an old ms1 as well, which has an onboard 2.5 bar map sensor (good to about 22psi or so), I may even have one of those things laying around. if you go the ms1 route you'll want the 3 wire distributor for ease of installation.
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Old 10-20-2020, 10:33 AM   #6
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I want LS coils...
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Old 10-20-2020, 10:44 AM   #7
242Bleek
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Thanks for the suggestions so far. That 123 ignition setup is tits. Had no idea that existed. I just happen to have an old MS1 lying around too. I'll see what I can make happen.
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Old 10-20-2020, 11:58 AM   #8
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Quote:
Originally Posted by 242Bleek View Post
Hello. I have an 83 245T with an M47. It has a T3/T4, gold injectors, still K jet (and keeping it that way) running about 18psi.
Why, if I may ask?
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Old 10-20-2020, 02:34 PM   #9
242Bleek
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Because its for this car. Its mostly original. Trying to stick with that theme here. Believe me 10 years ago I would have ripped it all out. Already did that to my 242.
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Old 10-20-2020, 02:35 PM   #10
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Not sure why the pics turned sideways. Just turn your screen sideways lol
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Old 10-20-2020, 05:04 PM   #11
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Holy moly is that nice.
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Old 10-20-2020, 05:06 PM   #12
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I've got an appt at the dyno for my T3/T4, B21FT, LH2.2, 15 psi monster...

Hoping for 200 whp.
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Old 10-20-2020, 05:42 PM   #13
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Quote:
Originally Posted by LC4CARL View Post
I've got an appt at the dyno for my T3/T4, B21FT, LH2.2, 15 psi monster...

Hoping for 200 whp.
Thanks, best of luck to you.
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Old 10-20-2020, 07:30 PM   #14
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I hear M47's are indestructible...

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Old 10-21-2020, 12:43 PM   #15
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What gold injectors did you use? I have a member here that is asking about kjet injectors.
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Old 10-21-2020, 03:32 PM   #16
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I dont remember the exact part number but they are brass and come from an inline 6 Mercedes. Seems to not lean out as bad under boost. I cant verify actual flow numbers.
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Old 10-21-2020, 06:11 PM   #17
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0437502047, adapted some to run on a 144gl -74. Much finer atomization than the old steel ones. The brass injectors does not flow more btw, fuel quantity is controlled from the fuel distributor outlets ;)
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