PFF - Pennock's Fiero Forum, PDA Edition

Turbo 3400, F23 build, 1985 GT (Page 3/26)

ericjon262

FEB 02, 12:50 PM

MS cam sensor support is a mess for me specifically. I can't speak to whether or not it will work for you.

As far as I am aware, there are three cam sensor arrangements on a stock 60V6.

From right to left,

Single tooth at approximately #4 TDC, this is earlier 3100/3400 engines, and as far as I am aware, ALL aftermarket camshafts.

1/2 polled, the sensor trigger is a 175 degree trigger, starting on cylinder 4 TDC. this was used on LX9 engines, and maybe some later 3400's.

VVT, the VVT camshafts have a specific, odd shaped trigger, and a completely different camshaft nose.

it's worth mentioning, the LX9, and earlier camshafts can be swapped, the VVT cam is specific, and the only non VVT cam I am aware of that's a direct swap, is the LNJ 3400 cam, which is a completely unique beast from a control standpoint.

I'm not sure how specifically to make your cam, work with 7x, and the MS3, but I am willing to help figure it out. if you have the engine apart, it might not be a bad idea to install a 60-2 (58x) trigger wheel, but that's not quite a walk in, walk out adventure. I like the 60-2 wheel, because it's by far the most common wheel out there, and should have the most support.

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"I am not what you so glibly call to be a civilized man. I have broken with society for reasons which I alone am able to appreciate. I am therefore not subject to it's stupid laws, and I ask you to never allude to them in my presence again."

I invited Lou Dias to trash me in my own thread, he refused. sorry. if he trashes your thread going after me. I tried.

ericjon262

FEB 02, 12:53 PM

quote

Originally posted by pmbrunelle:

I’m not sure about the 3400 cam sensor being compatible with MegaSquirt.

I remember ericjon262 welding onto a camshaft to make a half-moon sensor… maybe he can say a bit more about this.

among other things, I still have that cam, it's a bit of an oddball cam, pretty aggressive too.

1985 Fiero GT

FEB 02, 12:58 PM

quote

Originally posted by ericjon262:

MS cam sensor support is a mess for me specifically. I can't speak to whether or not it will work for you.

As far as I am aware, there are three cam sensor arrangements on a stock 60V6.

From right to left,

Single tooth at approximately #4 TDC, this is earlier 3100/3400 engines, and as far as I am aware, ALL aftermarket camshafts.

1/2 polled, the sensor trigger is a 175 degree trigger, starting on cylinder 4 TDC. this was used on LX9 engines, and maybe some later 3400's.

VVT, the VVT camshafts have a specific, odd shaped trigger, and a completely different camshaft nose.

it's worth mentioning, the LX9, and earlier camshafts can be swapped, the VVT cam is specific, and the only non VVT cam I am aware of that's a direct swap, is the LNJ 3400 cam, which is a completely unique beast from a control standpoint.

I'm not sure how specifically to make your cam, work with 7x, and the MS3, but I am willing to help figure it out. if you have the engine apart, it might not be a bad idea to install a 60-2 (58x) trigger wheel, but that's not quite a walk in, walk out adventure. I like the 60-2 wheel, because it's by far the most common wheel out there, and should have the most support.

Yeah, I'll have to see, I have not removed or touched the camshaft, so I'm not going to do anything until I know that it will not work as it is right now, if I can't easily get the cam sensor working, I'll maybe figure out a distributor trigger instead.

ericjon262

FEB 02, 01:12 PM

I made this for my LX9, but I'm under tighter space restrictions in that area than you are. The lower is a stock oil pump drive, the upper is a Jeep 4.0 cam sensor.

1985 Fiero GT

FEB 02, 01:13 PM

quote

Originally posted by ericjon262:

I made this for my LX9, but I'm under tighter space restrictions in that area than you are. The lower is a stock oil pump drive, the upper is a Jeep 4.0 cam sensor.

Interesting, looks very professional haha

ericjon262

FEB 02, 01:19 PM

thanks, I cut the two parts in a lathe for a light press fit, and then smashed them together. making the shaft was significantly harder.

1985 Fiero GT

FEB 05, 12:27 AM

Alright, my cam wheel is a simple half high half low, I don't know the specific wording, but yeah, megasquirt should be able to use that hopefully, did the majority of the engine harness wiring today, man that is not something I want to do to many times more, it ain't pretty, but it'll work (to be determined haha).

1985 Fiero GT

FEB 07, 11:10 PM

3400 engine, and f23 transmission installed on cradle and back in the car!

1985 Fiero GT

FEB 08, 06:40 PM

So for the F23 transmission, information I see on it says it has a "magnetic hall effect vehicle speed sensor". The sensor itself has just a 2 wire connector, everything I see in the megasquirt manuals and other online stuff doesn't have any real info on a 2 wire Hall effect sensor, I can either wire it to my megasquirt cam in (if it is a VR type sensor or I need both wires to go to the ECM), or to the digital frequency in if it is a hall effect sensor (I assume the one wire would be +12v, other goes to frequency in).

ericjon262

FEB 08, 06:53 PM

I modified a LX9 cam position sensor to work as a VSS because I kept having noise issues with the stock F23 VSS. I made a standoff to get the sensor the right distance from the wheel. If I can find pictures I'll post them for you, they're buried somewhere in my build thread.