CBR 600rr coils

[Angelo S38]

I'm planning on using, denso stick coils on my S38B36 bmw engine they're of an CBR 600rr.

Part Number 129700-4510

Has anybody used these coils with the EMU before? Can I run 6 of these straight of the EMU or should I use an ignition module?
Any recommendations on the dwell settings?

Thanks,
Angelo

[Jadzwin]

You can connect them directly to EMU...

[Angelo S38]

Hi Jadzwin,

Thanks for the swift reply, so power consumption wouldn't be too high?
Any idea on the settings?

[PBU]

I would start at 2.5 msec PW and measure the current.
Keep it under 5 amp peak to be safe to start.

If you don't have the specs of the coil check the temp of the coil regulary .

PBU

[Angelo S38]

Hi PBU,

How would you do that?
Would you use a microcontroller (to generate the PW signal) and measuring equipment similar to your injector testing setup?
Excellent job on that by the way.

I do have acces to a pulse generator so I might use that.

Angelo

[astra vxr]

Part Number 129700-4510

Primary resistance 1.4 ohms

Volts Milliseconds

8 - 6.00

10 - 3.75

12 - 2.80

14 - 1.95

16- 1.60

[Angelo S38]

Yep found those values as well, I'm looking for some confirmation perferably with expercience on the EMU.

[astra vxr]

i would go with them numbers they look about right and just keep an eye on them (check for over heating )
i doesnt matter what ecu you have them on they all handle dwell about the same

[Maciekx]

From 12-16v @ 2.5ms setting cbr 600rr is running without any problems, so this information is safe for coils

[PBU]

Hi PBU,

How would you do that?
Would you use a microcontroller (to generate the PW signal) and measuring equipment similar to your injector testing setup?
Excellent job on that by the way.

I do have acces to a pulse generator so I might use that.

Angelo

No , just meaure when on the car. You need a current sensor and oscilloskop.

Grts
PBU

[Angelo S38]

Thanks for the tips guys I'll start with these settings. (won't be for a while though)
But I still don't get how I should limit the current, as you say to 5A max?
Or Is this solely controlled by the dwell time and should I monitor it with a current sensor?

Thanks for the help!
Angelo

[Angelo S38]

For future reference

Did some more research on the subject and found the following article very helpfull. I think I get it now.
http://www.dtec.net.au/Ignition%20Coil% ... ration.htm
It describes a method for generating data on the bench as well. I think I'll try that first since it will be a while until I install it on my car. And I would like to do as much as I can to generate usefull data to speed up the actual on vehicle proces to keep downtime to a minimum.

[Angelo S38]

Did some measurements of my own, my power supply wasn't stable at 17v so I quit at 16v, here are the times I came up with for for 5A:

DENSO 129700-4510 J0451 dwell.xlsx

(10.93KiB)Downloaded 78 times

At 6 and 7 volts you don't reach 5A I do have the graphs as well in case anyone interested.

[Jadzwin]

Nice job!