I've been working on a trigger wheel for my audi after Tony inspired me with his setup. My wheel (red in the pictures) will be attached to on the back of the factory cam gear. I will mount it to the cam gear with 3 screws andspokes would allow
the gear to be turned to effect the proper timing offset. What do you'all think?

I would cut
the wheel with 11 holes (10 even and one in between), so you could have
the option of making any of 5- or 10-tooth "even" wheels, or 5+1, 10+1
or 10-1 and see which one gave best results with the -Extra wheel
decoder in megasquirt.





Modified by Justin Olson at 8:28 AM 4/7/2005


Modified by Justin Olson at 5:29 PM 4/7/2005

 

hall effect sensor for megasquirt?!
me likes!, now you need to make one for the D series....
stan

 

Good stuff Justin Still in ME I take it, eh?

 

I would recommend that you use 22 magnets spaced in 12-1 12-1 configuration, since the cam gear must provide two complete phasing cycles. The 12-1 configuration would allow you to use Ford EDIS which is more robust than the -EXTRA wheel decoder software, which is designed more for OEM DIS cars instead of aftermarket retrofits.

Of course, if you plan to use magets with a passive HES, you will have to construct a circuit to mimic the active HES output that Ford uses with the EDIS.

Alternatively, you could alter your cam gear by removing half of a tooth on opposite sides of the wheel. Since the cam gear has 52 teeth, it would then be possible to use an active HES (I can give you the Digikey P/N that corresponds to the sensor used by Ford/Mazda/Kia DIS), by programming the MegaSquirt wheel decoder software for a 26-1 tooth wheel configuration, which is entirely plausible. You would then mount the sensor below the cam gear and nobody would even know it was there.

Good luck with this project, BTW. My friend Matt and I have been working on MS'ing our Rios, and his is actually running right now, with the OEM DIS, Knock sensor, boost controller, and other MSnS Extra goodies working. We are using DSM Transistor Modules to fire our coils, which would be the preferred method for you if you choose to use a pair of wasted spark coilpacks.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kataku2K3 &raquo;</TD></TR><TR><TD CLASS="quote">Good stuff Justin Still in ME I take it, eh? </TD></TR></TABLE>

haha.. i had a feeling for some reason that you would be in this thread after i saw the engineering cad pictures and corvallis.

you boy some beavers are ya . very good work man

 

Yeah still plugging away at mechanical engineering. I'm going to play around with solid works some more tonight and try some different magnet layouts.

I'm not sure if I could cut any teeth of the cam gear itself due to reliablilty with the timing belt. My car is a 5 cylinder and Im not sure if EDIS would work with it. Time for more research...

 

go beavs

 

Go Beavis!!!


I fitted the magnets to the trigger wheel. Now I just have to work out the attachment between the trigger hoop and the cam gear...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by envision2teg &raquo;</TD></TR><TR><TD CLASS="quote">go beavs</TD></TR></TABLE>
haha, crazy how we start talking about our school on H-T... Shouldn't we be doing homework, I know I <U>should</U> be!

 

More Pics...

 

Lighter Version:

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kataku2K3 &raquo;</TD></TR><TR><TD CLASS="quote">
haha, crazy how we start talking about our school on H-T... Shouldn't we be doing homework, I know I <U>should</U> be!</TD></TR></TABLE>

word.

 

Lighter & Rounder

 

Going to cut it on the CNC mill?

 

I would...

 

Yeah, thats the plan. I've never had any parts CNC'd before so I'm going to shop around locally once I'm a bit further along. Solid Works Kicks ***. I was doing stress analysis on the gear last night just for fun. It plays a animated video showing where the part will deform depending on the load that is applied to it. I love technology

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by beepy &raquo;</TD></TR><TR><TD CLASS="quote">

Alternatively, you could alter your cam gear by removing half of a tooth on opposite sides of the wheel. Since the cam gear has 52 teeth, it would then be possible to use an active HES (I can give you the Digikey P/N that corresponds to the sensor used by Ford/Mazda/Kia DIS), by programming the MegaSquirt wheel decoder software for a 26-1 tooth wheel configuration, which is entirely plausible. You would then mount the sensor below the cam gear and nobody would even know it was there.
</TD></TR></TABLE>

^ that sounds bad *** to me. i might have to PM you in some time when i try to get megasquirt II and my car running.

 

damn tony look what you started,

 

I remember speaking to someone at either electromotive or motec about the way they make their trigger wheels. Supposedly, they don't cnc them they have them laser cut because even the small imprecisions in the cnc stuff...guessing their machinist is using a rotary table...was causing a 2-3 degree scatter