VVT ideas and testers

Testing and development of Megasquirt 3

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Re: VVT ideas and testers

Postby jsmcortina » Thu Oct 27, 2011 11:37 am

That seems a little excessive. y8s has proved good results with just a single jumper wire.

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Re: VVT ideas and testers

Postby y8s » Thu Oct 27, 2011 1:02 pm

nah I added a connector so the expander and mainboard were no longer tethered like a wacky electronic nunchaku.
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Re: VVT ideas and testers

Postby jsmcortina » Thu Oct 27, 2011 1:59 pm

y8s wrote:nah I added a connector so the expander and mainboard were no longer tethered like a wacky electronic nunchaku.

Just on the one wire or something else? (confused.)

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Re: VVT ideas and testers

Postby y8s » Thu Oct 27, 2011 2:30 pm

Yes so I can separate the two boards. it's simple, not requiring confusion at all.
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Re: VVT ideas and testers

Postby MidShipCivic » Fri Oct 28, 2011 6:13 am

I need some advice.

I'm going to retrofit MIVEC to a Mitsubishi 4g63, but using megasquirt to control the cam(s) I just need to know, does the feed back system need high resolution wheels?

Running missing tooth on crank and single tooth on cam the Int Cam uses the main sensor single tooth suffice what is it reporting every revolution?
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Flyback before and after

Postby hoveringuy » Fri Oct 28, 2011 6:27 am

I ran my diode cathodes to the +12 input and captured the new signal. Improvement is remarkable.

This mod is probably necessary for almost anyone that wants to run VVT.
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Re: VVT ideas and testers

Postby hoveringuy » Sat Oct 29, 2011 12:13 pm

Bug or ?.

I have the intake cam VANOS running relatively well when it's synched to cam, but nothing works when I change to control interval. Duty cycle is stuck at 0.

Ideas?
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Re: VVT ideas and testers

Postby jsmcortina » Sun Oct 30, 2011 3:42 pm

"Control interval" fixed for alpha 15

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Re: VVT ideas and testers

Postby MidShipCivic » Mon Oct 31, 2011 3:18 am

MidShipCivic wrote:I need some advice.

I'm going to retrofit MIVEC to a Mitsubishi 4g63, but using megasquirt to control the cam(s) I just need to know, does the feed back system need high resolution wheels?

Running missing tooth on crank and single tooth on cam the Int Cam uses the main sensor single tooth suffice what is it reporting every revolution?


Anyone ?
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Re: VVT ideas and testers

Postby jsmcortina » Mon Oct 31, 2011 3:37 am

I don't understand your question. What is Intcam ?

What wheels are you planning on running?
Something like 36-1 on the crank and single tooth on the cam would be fine - so long as the cam tooth is far away from the missing tooth region so it never crosses it.

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Re: VVT ideas and testers

Postby MidShipCivic » Mon Oct 31, 2011 5:08 am

jsmcortina wrote:I don't understand your question. What is Intcam ?

What wheels are you planning on running?
Something like 36-1 on the crank and single tooth on the cam would be fine - so long as the cam tooth is far away from the missing tooth region so it never crosses it.

James


Int. cam = Intake cam.

I'm asking about the feed back system for the camphasing it has to know position. Doesn't it need a high resolution sensor?
I am retrofitting it I just need some advice on what wheels to use for it.


On the crank I use a GM 60-3 crank trigger wheel.
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Re: VVT ideas and testers

Postby jsmcortina » Mon Oct 31, 2011 5:21 am

That should work.

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Re: VVT ideas and testers

Postby hoveringuy » Mon Oct 31, 2011 6:36 am

I mofified the flyback on the MS3X board last week by jumpering to +12v and had a significant improvement in my signal, much more efficient. There was still some troubling spikes, however.

I changed the 6 diodes to Shottky diodes and was able to eliminate those spikes. I haven't noticed a difference, but noise spikes have a pesky way of propagating and messing up other functions. I used Digikey part #MBRS360BT3G
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Re: VVT ideas and testers

Postby gurov » Mon Oct 31, 2011 7:31 am

can you please post a picture with spots marked where these need to be replaced. i've got a bunch of those diodes on order.
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Re: VVT ideas and testers

Postby hoveringuy » Mon Oct 31, 2011 7:50 am

gurov wrote:can you please post a picture with spots marked where these need to be replaced. i've got a bunch of those diodes on order.


They're only $0.65 each and it took me a few minutes to replace them. Remember to remove any residual flux if you use fresh solder... it's acid!
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Re: VVT ideas and testers

Postby gurov » Mon Oct 31, 2011 7:52 am

hoveringuy wrote:
gurov wrote:can you please post a picture with spots marked where these need to be replaced. i've got a bunch of those diodes on order.


They're only $0.65 each and it took me a few minutes to replace them. Remember to remove any residual flux if you use fresh solder... it's acid!


great.

is that tan wire going straight to +12v ?
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Re: VVT ideas and testers

Postby jsmcortina » Mon Oct 31, 2011 8:16 am

You might be missing a trick here.

Does the behaviour of the VVT solenoid actually change?
If yes, then good work.
If no, then why change the diodes !

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Re: VVT ideas and testers

Postby hoveringuy » Mon Oct 31, 2011 9:06 am

gurov wrote: is that tan wire going straight to +12v ?


Yes.

jsmcortina wrote:Does the behaviour of the VVT solenoid actually change?
If yes, then good work.
If no, then why change the diodes !
James


No difference in how the VANOS works with Schottky. Changing the diodes might be overkill, but it also might clear-up an unrelated issue somewhere else; that noise could be going anywhere...
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Re: VVT ideas and testers

Postby jsmcortina » Mon Oct 31, 2011 9:27 am

Also, the 36V clamps in the scope shot is by design. I'm sure you realised that, but for other readers it is the same kind of clamp used in the injector flyback circuit.

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Re: VVT ideas and testers

Postby hoveringuy » Mon Oct 31, 2011 10:05 am

jsmcortina wrote:Also, the 36V clamps in the scope shot is by design. I'm sure you realised that, but for other readers it is the same kind of clamp used in the injector flyback circuit.

James


Yes, the active flyback was designed correctly, it's used on mainboard batch injection but not on sequential fuel. I honestly don't know why it behaves that way on MS3X medium current outputs. Is it the IPS022G MOSFET? The frequency? the PWM?
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