Just fitted a ford VR sensor to my lotus twincam.
Can't get a signal on my MSII..
Checked the wiring, fine..
Checked the AC voltage from the sensor when running:
3.5v @ 600 rpm
is this too high?
Could this be why I don't get a signal on my MSII..?
If not, what could it be?
Cable is shielded...
Should I adjust the pots R56 &R52?
Tim
Voltage too high from VR
Forum rules
Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0). For tuning/troubleshooting questions, please attached a datalog and your MSQ file to your post.
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0). For tuning/troubleshooting questions, please attached a datalog and your MSQ file to your post.
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
-
Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: Voltage too high from VR
It needs to go a lot higher before you lose the signal. Are you using a two tooth crank trigger or a missing tooth wheel? If it's a missing tooth wheel, how is it set up?
Re: Voltage too high from VR
Its a 36-1 missing tooth.
The teeth are cut into the crank pulley and the sensor is held using a commercial bracket.
I have routed the cable to keep away from the coil and dizzy on the existing ignition (although it is within 10-15 cm at one point)
Is this what you mean?
Tim
The teeth are cut into the crank pulley and the sensor is held using a commercial bracket.
I have routed the cable to keep away from the coil and dizzy on the existing ignition (although it is within 10-15 cm at one point)
Is this what you mean?
Tim
-
Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: Voltage too high from VR
Yes, that is precisely what I was wondering about. I presume you are using a distributor and not EDIS. At this point I would check three things.
1. The polarity on the VR sensor. If you get it backwards, the MS may see two "one and a half tooth" gaps instead of one double-tooth gap.
2. The wheel decoder settings in MegaTune. If you need help with these, please post your MSQ.
3. The VR trim pot adjustment.
1. The polarity on the VR sensor. If you get it backwards, the MS may see two "one and a half tooth" gaps instead of one double-tooth gap.
2. The wheel decoder settings in MegaTune. If you need help with these, please post your MSQ.
3. The VR trim pot adjustment.
-
john.p.clegg
Re: Voltage too high from VR
Tim
When you say "Could this be why I don't get a signal on my MSII..?" what/where are you measuring, are you not getting the 3.5v? at the Ms
John
When you say "Could this be why I don't get a signal on my MSII..?" what/where are you measuring, are you not getting the 3.5v? at the Ms
John
Re: Voltage too high from VR
Aha... may have sorted it..
I was trying to look at the output from the VR sensor using the MS while the engine was running on a distributor based ignition.
(this doesn't seem to work, perhaps because of electrical noise?)
however I noticed that if I started the engine, the MS picked up the RPM before the engine fired..
Just been out to check the car again. this time cranking without the old ignition connected.
voila! get a signal from the Ms (see below) How does this look?
I have also recorded the signal from the sensor directly with the scope.
I recorded the signal from each wire from the sensor (see below) How do these look?
thanks for any help
Cheers
tim
I was trying to look at the output from the VR sensor using the MS while the engine was running on a distributor based ignition.
(this doesn't seem to work, perhaps because of electrical noise?)
however I noticed that if I started the engine, the MS picked up the RPM before the engine fired..
Just been out to check the car again. this time cranking without the old ignition connected.
voila! get a signal from the Ms (see below) How does this look?
I have also recorded the signal from the sensor directly with the scope.
I recorded the signal from each wire from the sensor (see below) How do these look?
thanks for any help
Cheers
tim
You do not have the required permissions to view the files attached to this post.
Re: Voltage too high from VR
Wahey!!!!
Sucess..
tried starting the car using MS for ignition..
first turn of the key she fired!
then 30 mins of firing, running roughly for 30 secs then dieing..
then switch the VR leads and voila! steady idle..
Had to leave it at that as it is blowing a gale so cannot work with garage doors open, hence risk CO poisoning if I try to tune!
Cheers
Tim (v. V. happy)
Sucess..
tried starting the car using MS for ignition..
first turn of the key she fired!
then 30 mins of firing, running roughly for 30 secs then dieing..
then switch the VR leads and voila! steady idle..
Had to leave it at that as it is blowing a gale so cannot work with garage doors open, hence risk CO poisoning if I try to tune!
Cheers
Tim (v. V. happy)