Author Topic: 123 ignition - which coil please? Seems lots of options.  (Read 1088 times)

Paul99

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  • 230 SL White. 1966.
I notice 123 have on their website to use the Bosch BLUE coil, which is discontinued.  Others same the flamethrower coil, or the Bosch Black or Red coil!  Some say 1.5ohm, some say 3 ohm Some say keep the ballast resister some say not.

What is the general consensus?    I now have the Bosch Black 3.4 ohm coil 9 224 771 008  with no ballast resister fitted and all seems ok . 

BobH

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Re: 123 ignition - which coil please? Seems lots of options.
« Reply #1 on: July 11, 2023, 19:33:11 »
Hello Paul, as usual many differences of opinion, and many seem to work satisfactorily, but reply #15 seems to be the definitive advice from the manufacturer for our cars

https://www.sl113.org/forums/index.php?topic=23428.msg167802#msg167802

From the manufacturers website, slightly contradicts their advice in the above post

"For 6 cylinder engines we advise to change your coil to a high performance coil because of the short load time in the higher rpm range. Make sure you use coils with a primary resistance of at least 1.0 Ohm. ( 1,0 Ohm or more ) For standard street engines we advise a “Bosch Blue” or “Beru ZS106” coil. For high rpm engines a “Bosch red (0 221 119 030)” or “Beru ZS109” is much better."
« Last Edit: July 11, 2023, 19:38:26 by BobH »
February 1965 230SL Automatic
UK delivered RHD
Papyrus white, blue hard top & hub caps
Blue soft top
Blue leather

Paul & Dolly

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Re: 123 ignition - which coil please? Seems lots of options.
« Reply #2 on: July 11, 2023, 20:26:01 »
I have a Bosch Red coil on mine, works fine.

Paul
Paul (located in Cardiff - Wales - UK)
1967 Early 250 SL (Auto) White
Mitsubishi i Car
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1936 Alvis Firebird (Gone............)

alpina

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Re: 123 ignition - which coil please? Seems lots of options.
« Reply #3 on: July 12, 2023, 07:43:43 »
Bosch Red coil with bypassed / No ballast resister as recommended by 123ignition.nl

Cees Klumper

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Re: 123 ignition - which coil please? Seems lots of options.
« Reply #4 on: July 12, 2023, 12:41:19 »
BERU ZS115 coil and no ballast resistor on my 123 ignition. Runs very well.
Cees Klumper
1969 Mercedes 280 SL automatic
1961 Alfa Romeo Giulietta Sprint Coupe 1600
1962 FIAT 1500S OSCA convertible
1972 Lancia Fulvia Coupe 1.3
1983 Porsche 944 2.5
1990 Ford Bronco II

Paul99

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Re: 123 ignition - which coil please? Seems lots of options.
« Reply #5 on: July 12, 2023, 13:09:45 »
Great thanks chaps. 

I have the Bosch black coil which seems the same specs as the red coil so will try it and see what happens.   It's slightly anoining that 123 seem to change their mind a bit.  But looks like the 3ohm and high capacity coils are the answer.

Benz Dr.

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Re: 123 ignition - which coil please? Seems lots of options.
« Reply #6 on: July 12, 2023, 19:19:45 »
Great thanks chaps. 

I have the Bosch black coil which seems the same specs as the red coil so will try it and see what happens.   It's slightly annoying that 123 seem to change their mind a bit.  But looks like the 3ohm and high capacity coils are the answer.

Black coil is 13KV and red coil is 26KV.
1966 230SL 5 speed, LSD, header pipes, 300SE distributor, ported, polished and balanced, AKA  ''The Red Rocket ''
Dan Caron's SL Barn

1970  3.5 Coupe
1961  190SL
1985   300CD  Turbo Coupe
1981  300SD
2013  GMC  Sierra
1965  230SL
1967 250SL
1970 280SL
1988 560SEC