are all Cops Equal

greenMachine · Postby **greenMachine** » Fri Apr 26, 2019 6:48 pm

Red_Bullet wrote:[... hopefully the ECU is capable of switching the higher current without blowing up the output transistors inside the ECU.

Relay. On my PS100 at least.

:mrgreen:

Red_Bullet · Postby **Red_Bullet** » Fri Apr 26, 2019 7:44 pm

Just checked my ms3 tune for standard coils, 3.6mS Dwell Spark time 0.7 mS. Cranking dwell is 4.5, that's because the voltage is lower while cranking. I don't run E85.

Red_Bullet · Postby **Red_Bullet** » Fri Apr 26, 2019 8:10 pm

greenMachine wrote:
Red_Bullet wrote:[... hopefully the ECU is capable of switching the higher current without blowing up the output transistors inside the ECU.

Relay. On my PS100 at least.

Yes relay on the positive supply side, good idea, that and nice fat wire! My concern with high energy coils is the transistors inside the ECU that actually does the switching on and off, which is on the negative side. OCD maybe, I'm a retired electronics kind of person. Please excuse my paranoia. edit: IIRC I think the transistors used in the MS3 are rated at 5 amps, which is plenty of headroom.

Magpie · Postby **Magpie** » Sat Apr 27, 2019 4:41 pm

StanTheMan wrote:According to that sounds like the Bosh Yaris one is the ducks guts for us street Mx5

Have you managed to source these Bosh Yaris COP's that fit the MX5?

hks_kansei · Postby **hks_kansei** » Sat Apr 27, 2019 5:59 pm

Red_Bullet wrote:Anybody got access to a Yaris and an oscilliscope? You could see what toyota engineers dwelled them at! Common figures around the internet though is 1.9 to 2.1 mS. If you dwell too long then the coil will saturate and overheat. (That's the nature of inductors in a DC circuit)

I've got an oscilloscope, but no clue how to use it for anything other than a giant bench mounted tacho.

Plus, all the controls are in German.
It's an old Hoffman multitest engine diagnostic machine from pre-89

Red_Bullet · Postby **Red_Bullet** » Sat Apr 27, 2019 6:16 pm

Hmmm....Where I used to work they are oscilliscopes available. I'm thinking one of my ex-colleagues bought a Yaris for his daughter, I'll ask him to have a look at the voltage across the COP primary, it would give a true indication of the dwell time. Not promising anything, but watch this space.

StanTheMan · Postby **StanTheMan** » Sat Apr 27, 2019 6:59 pm

Magpie wrote:
StanTheMan wrote:According to that sounds like the Bosh Yaris one is the ducks guts for us street Mx5

Have you managed to source these Bosh Yaris COP's that fit the MX5?

I haven’t, there are some available on EBay but Bosch made in Japan? So I hesitated. Today I had a good look . It turns out my wiring was dodgy. The whole Cops loom was the rewired & soldered how it should have been in the first place. Speed came to my rescue. We have different skill sets . Speeds skill set proved worthy today.
Running sweet.

I will source those bosh Cops when I have money burning a hole in my pocket of if one of the COPs does actually break. I have a pretty strong battery. So for now they are safe enough to use.

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Magpie · Postby **Magpie** » Sat Apr 27, 2019 7:12 pm

StanTheMan wrote:It turns out my wiring was dodgy.

Hmmmm I may have suggested that a few posts ago...

StanTheMan · Postby **StanTheMan** » Sat Apr 27, 2019 7:13 pm

You did, thank you

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StanTheMan · Postby **StanTheMan** » Sat Apr 27, 2019 7:51 pm

Speed Furiously soldering on Patchy's COP's Loom

there is supposed to be a picture. But I have sh*t TPG internet connection.

Magpie · Postby **Magpie** » Wed May 01, 2019 12:05 pm

Bosch 503 Coils suit Toyota from https://www.efisolutions.com.au/

Also make sure the spark plugs you are using have RESISTORS as these COPS highly susceptible to back feeding from non-resistor plugs... blows the transistor inside.

hks_kansei · Postby **hks_kansei** » Wed May 01, 2019 1:38 pm

Magpie wrote:Bosch 503 Coils suit Toyota from https://www.efisolutions.com.au/

Also make sure the spark plugs you are using have RESISTORS as these COPS highly susceptible to back feeding from non-resistor plugs... blows the transistor inside.

I thought basically all plugs these days had resistors?

well, ones that fit an MX5 anyway.

Magpie · Postby **Magpie** » Wed May 01, 2019 2:09 pm

hks_kansei wrote:I thought basically all plugs these days had resistors?

There are plugs without resistors that fit the MX5, any 14mm with threadreach of 19mm.

hks_kansei · Postby **hks_kansei** » Wed May 01, 2019 2:59 pm

Magpie wrote:
hks_kansei wrote:I thought basically all plugs these days had resistors?
There are plugs without resistors that fit the MX5, any 14mm with threadreach of 19mm.

Sorry, I meant more that arent all "normal" plugs resisted now?
(like the usual BK5RE and the temps above/below them, rather than strange special order ones)

Would there be any reason to specifically use non-resistor plugs? (in an MX5)

Magpie · Postby **Magpie** » Wed May 01, 2019 3:09 pm

hks_kansei wrote:Would there be any reason to specifically use non-resistor plugs? (in an MX5)

Not really, in a race car you do not have to worry about electrical interference that can disrupt the radio or mobile operation. However it may create noise for the ECU... and damage coils...

However if your leads have the resistor built in then you do not need a resistor plug.

I have learnt a lot about plugs recently when trying to find the Bosch COP's.