Pelican Parts Forums - What coils to use on a NA twin plug?

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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.

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

Quote:

Originally Posted by NathanUK (Post 4057375)

OK, here are the resistances

At the CDI connector with it unplugged
http://farm4.static.flickr.com/3115/...b394d7f9_o.jpg
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
http://farm4.static.flickr.com/3241/...94346188_o.jpg
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

Coils were not the problem. The tuner forgot that he programmed the MoTeC to rev limit at a certain "water" temperature.