Innovate LM-2 Rpm question
12-25-2010, 08:33 PM
#1
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Innovate LM-2 Rpm question
So i got a Innovate LM-2 for xmas and the inductive RPM clamp. at idle it jumps around between 980-1200, think the sensor is off, the car tach seems to be around 850 ish. so im not sure what to trust. whats the best way to figure out what you RPM really is?
12-25-2010, 09:27 PM
#2
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you need to calibrate your set up,i have a lc1,daisy chained to a ssi-4 -datta logging rpm,afr,boost,tps,this all on a zx14 kawa turbo, its a little diff. to setup, email felipe at innovative he can help you.
12-25-2010, 11:33 PM
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12-25-2010, 11:49 PM
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Why are you using the inductive clamp for RPM?
I swear if we get him drunk enough at the next garage weekend he'll start speaking in 1's and zero's.
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12-26-2010, 12:13 AM
#8
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so how do i go about doing that? and what would the hook up be to the LM-2? i have the "head phone jack" adapter to the two wire plug for it.
12-26-2010, 01:23 AM
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There's an analog cable that comes with and plugs into the LM2. The Black/White wire of the cable is where a tach signal gets connected to. There are a number of different places that you can get a tach signal from, but they vary depending on the model year of your car. It looks like your's might be an L-Jet car. If it is, you should be able to get a usable signal from any of the following places:
Plugs along the bottom of the fuse panel - any one of O7, G7, Z4, or W6
Fuel injection computer pin #1
Fuel injector signals should also be usable by the LM2 for an RPM reading. Besides right at any one of the injectors, you should be able to get that signal from any one of pins 14, 15, 32, or 33 of the injection computer, or plugs W2 or W3 at the bottom of the fuse panel.
Another source for a usable signal should be the negative terminal of the ignition coil.
The blue wire of the LM2 analog cable is for a ground to reference the tach signal to. You probably won't need to connect it for a good RPM reading. If you do end up getting weird tach readings, try connecting that blue wire to ground before you spend too much time looking for the problem somewhere else.
I'd try Z4 at the bottom of the fuse panel first for the tach signal source. There shouldn't be any wire currently connected to that terminal in your car, so it should be pretty easy to connect there. If Z4 doesn't work, go to one of the other locations mentioned above. Since Z4 isn't used from the factory, it may or may not be wired up by the factory. Porsche didn't wire all fuse boxes the same, and things that are supposed to be connected according to the wiring diagrams sometimes are on some cars, and aren't on others of the same model year.
Plugs along the bottom of the fuse panel - any one of O7, G7, Z4, or W6
Fuel injection computer pin #1
Fuel injector signals should also be usable by the LM2 for an RPM reading. Besides right at any one of the injectors, you should be able to get that signal from any one of pins 14, 15, 32, or 33 of the injection computer, or plugs W2 or W3 at the bottom of the fuse panel.
Another source for a usable signal should be the negative terminal of the ignition coil.
The blue wire of the LM2 analog cable is for a ground to reference the tach signal to. You probably won't need to connect it for a good RPM reading. If you do end up getting weird tach readings, try connecting that blue wire to ground before you spend too much time looking for the problem somewhere else.
I'd try Z4 at the bottom of the fuse panel first for the tach signal source. There shouldn't be any wire currently connected to that terminal in your car, so it should be pretty easy to connect there. If Z4 doesn't work, go to one of the other locations mentioned above. Since Z4 isn't used from the factory, it may or may not be wired up by the factory. Porsche didn't wire all fuse boxes the same, and things that are supposed to be connected according to the wiring diagrams sometimes are on some cars, and aren't on others of the same model year.
12-26-2010, 04:24 AM
#10
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For the noobs to the 928 forum not use to seeing Z around, he is to electronics, data-logging, and all things Innovate what Greg Brown is to engines and Paul Champagne is to leather.
I swear if we get him drunk enough at the next garage weekend he'll start speaking in 1's and zero's.
I swear if we get him drunk enough at the next garage weekend he'll start speaking in 1's and zero's.
Get him a lap dance first.
Next to the guys that BUILT and developed the Innovate stuff, when it relates to a 928, Z can answer questions they can not!
Merry Christmas Z
5 more posts and your at the magic number!
12-26-2010, 12:00 PM
#11
Thread Starter
There's an analog cable that comes with and plugs into the LM2. The Black/White wire of the cable is where a tach signal gets connected to. There are a number of different places that you can get a tach signal from, but they vary depending on the model year of your car. It looks like your's might be an L-Jet car. If it is, you should be able to get a usable signal from any of the following places:
Plugs along the bottom of the fuse panel - any one of O7, G7, Z4, or W6
Fuel injection computer pin #1
Fuel injector signals should also be usable by the LM2 for an RPM reading. Besides right at any one of the injectors, you should be able to get that signal from any one of pins 14, 15, 32, or 33 of the injection computer, or plugs W2 or W3 at the bottom of the fuse panel.
Another source for a usable signal should be the negative terminal of the ignition coil.
The blue wire of the LM2 analog cable is for a ground to reference the tach signal to. You probably won't need to connect it for a good RPM reading. If you do end up getting weird tach readings, try connecting that blue wire to ground before you spend too much time looking for the problem somewhere else.
I'd try Z4 at the bottom of the fuse panel first for the tach signal source. There shouldn't be any wire currently connected to that terminal in your car, so it should be pretty easy to connect there. If Z4 doesn't work, go to one of the other locations mentioned above. Since Z4 isn't used from the factory, it may or may not be wired up by the factory. Porsche didn't wire all fuse boxes the same, and things that are supposed to be connected according to the wiring diagrams sometimes are on some cars, and aren't on others of the same model year.
Plugs along the bottom of the fuse panel - any one of O7, G7, Z4, or W6
Fuel injection computer pin #1
Fuel injector signals should also be usable by the LM2 for an RPM reading. Besides right at any one of the injectors, you should be able to get that signal from any one of pins 14, 15, 32, or 33 of the injection computer, or plugs W2 or W3 at the bottom of the fuse panel.
Another source for a usable signal should be the negative terminal of the ignition coil.
The blue wire of the LM2 analog cable is for a ground to reference the tach signal to. You probably won't need to connect it for a good RPM reading. If you do end up getting weird tach readings, try connecting that blue wire to ground before you spend too much time looking for the problem somewhere else.
I'd try Z4 at the bottom of the fuse panel first for the tach signal source. There shouldn't be any wire currently connected to that terminal in your car, so it should be pretty easy to connect there. If Z4 doesn't work, go to one of the other locations mentioned above. Since Z4 isn't used from the factory, it may or may not be wired up by the factory. Porsche didn't wire all fuse boxes the same, and things that are supposed to be connected according to the wiring diagrams sometimes are on some cars, and aren't on others of the same model year.
i got just the basic kit, so i did not get that serial cable with the unconnected ends. but thats on my list of things to get. thanks for the input. ill just hold off on RPM for now and just work on getting my 14.9 AFR...
