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
Attachments
newfrompeter51617.msq
(119.77 KiB) Downloaded 5 times
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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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Re: direct coil control

Postby turbo_pinto » Tue May 23, 2017 6:05 pm

I have removed the squirt from the car. I have verified pin 36 goes to Q16 on 3.0 board 2005, i would say it is blue. On the under side there is a resistor covered in hot glue that I can not identify.

The person who did the repair said nothing was touched outside of a bad flyback resistor (3 legged) and replacing a knock off map sensor with a MAPDADDY. I can visually see the difference in the hot glue application.

I am inclined to believe it is a software issue but the only difference between the two files are marginal tuning as I was fighting injectors dropping.
Attachments
MyCar_2016-12-01_18.50.09.msq
This was the last running tune file.
(85.97 KiB) Downloaded 2 times
newfrompeter51617.msq
current tune
(119.77 KiB) Downloaded 4 times
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Re: direct coil control

Postby Twistedmetal » Wed May 24, 2017 4:30 pm

Can you post pictures of the board front and back? If it is the one I'm thinking of, you just nip one side of the resistor and heat shrink the whole thing or remove it completely. Then you change your dwell settings to standard dwell, 3ms dwell (it helps to know the coil's resistance and inductance, 3ms is probably safe), 1ms spark duration (unless you know the coil's duration), if you are feeding Q16's output directly to the neg of the coil it will fire when commanded.
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 26, 2017 4:39 pm

All i am trying to accomplish is whether or not im being jerked around. The gentleman who repaired it is telling me he tested it and it works as a tfi so he says, but will not fire a coil. I will admit that I am in way over my head, that is why I purchased an assembled unit.

As far as jumpers, the only place I see them is on the small board that sits on top, section JP1 and none are jumped.
Attachments
IMG_4428.JPG
IMG_4428.JPG (947.03 KiB) Viewed 59 times
IMG_4429.JPG
IMG_4429.JPG (830.41 KiB) Viewed 59 times
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Re: direct coil control

Postby slow_hemi6 » Fri May 26, 2017 5:08 pm

That q16 does not look like a BIP373 ignition driver. I can't see any ID marks on it either. If it's not a coil driver then maybe that is why whomever is saying it can't drive a coil direct.
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