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Join Date: Dec 2005
Location: GARDEN GROVE, CA
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What coils to use on a NA twin plug?

A shop in Hong Kong is installing our latest unit on a NA twin plug car.

MoTeC ECU, everything is fine to 6500, then acts like the rev limiter kicks in.

Two days of emails later, he says he finally disconnected the J&S and his Bosch igniters misfire too.

His coils have 1 ohm primary resistance. I told him to change to something with 0.5 ohm, but I don't have a part number.

Number, please? Thanks much.
Old 07-24-2008, 11:39 PM
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My stock 930 coil has a resistance of 0.7 ohms.
I'm sure Pelican could fix you up with one if they wanted to try it. http://www.pelicanparts.com/catalog/shopcart/911M/POR_911M_ELignt_pg9.htm#item38


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Originally Posted by NathanUK View Post
OK, here are the resistances

At the CDI connector with it unplugged

Coax to dizzy (green cable) is 570 inner to outer wire.
Brown to White (coil primary) is .7

Coil secondary (coil HT to either + or -) is 649

At the CDI box

31/1 to 31d is 0 (closed circuit)
31d to 15 is 672
31d to TD will charge briefly and then go to infinity (open circuit)
31/1 to TD also charges briefly and then goes to infinity (open circuit)

My CDI is a 930.602.702.00
Bosch number 0 227 300 004
__________________
1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg

Last edited by NathanUK; 07-25-2008 at 09:43 AM..
Old 07-25-2008, 09:40 AM
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Coils were not the problem. The tuner forgot that he programmed the MoTeC to rev limit at a certain "water" temperature.
Old 07-28-2008, 12:15 PM
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Hehe
__________________
1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 07-28-2008, 01:50 PM
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