direct coil control

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direct coil control

Postby turbo_pinto » Thu May 18, 2017 6:35 pm

I have a wilson racing ms2 that was built and ran with the direct coil control mod, wire #36 removed from TFI and ran directly to neg side of coil. Are there any corresponding mods done internally that allow this to happen?

I recently received it back from a repair to injector drivers and have lost spark as far as I can tell. A firmware update was completed as well. I have gone over my tuner studio settings and they are the same as before.

old firmware was ms2extra beta 3.2.1

I have succesfully tested fuel pump, injectors and iac with the new test features but can not get spark out of the coil. Coil and tfi are known good and ran in january.

Now I am being told megasquirt can not/should not drive a coil?

I am trying to get some unbiased answers, i have no datalogs to attach
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Re: direct coil control

Postby rickb794 » Fri May 19, 2017 6:25 am

Can't open your MSQ right now.

Look at jumpering and TS settings for spark out. The two must match.

Which is it wired for, js10 or D14?
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Re: direct coil control

Postby Twistedmetal » Fri May 19, 2017 12:09 pm

Did you remove the TFI pull up resistor (s12 to ign)? If not you need to. I'm driving mine directly with a vb921 and dwell set to 3ms at 14v, keeps the coil from drawing more than 6.5 amps per charge so as not to burn up the transistor, car runs great all the way to 11psi. Dwell setting must match the coil or you will let the smoke out.
MS2 v3 w/Ford IAC mod running MS2Extra 3.3.2b8
TFI trigger with direct coil control, 60# highZ injectors
91 Ford Mustang, modified 5.0, 70mm turbo @ 11#s
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Re: direct coil control

Postby turbo_pinto » Fri May 19, 2017 1:01 pm

@ Rickb before the repair it was d14. I purchased as a pre assembled unit.

@twistedmetal I have never seen inside the case. I sent unit out because it was dropping injectors, I got it back and have no spark.

So I am clear, there IS a deviation from standard tfi wiring inside a squirt with direct coil control.
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Re: direct coil control

Postby Twistedmetal » Fri May 19, 2017 1:32 pm

Both TFI and direct coil control use the high current IGBT driver, the only difference is the TFI uses an additional pull up resistor and fixed dwell settings, the direct coil uses a set dwell
MS2 v3 w/Ford IAC mod running MS2Extra 3.3.2b8
TFI trigger with direct coil control, 60# highZ injectors
91 Ford Mustang, modified 5.0, 70mm turbo @ 11#s
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