I have the Innovate Motorsports LM1 meter, along with the RPM converter cable. I can grab an RPM signal from the tach wire going to my Autometer tach, so that should hopefully be simple.

I also want to record TPS data using the LM1 (along with A/F and RPM data). Where is the best place to splice into the TPS voltage output wire? Would it be ok to do it near the TPS itself?

(btw, this is on my '87 vette)

Thanks!
Dan

 

I have a similiar question...I am thinking about getting a LM-1. Could I read the AFR ratios at specified rpms on my laptop? or would I need that rpm signal thing. And waht are the benefits of the LM-1? Could a gauge be attached to it at a later date? Thanks.

Sorry to hijacked your thread!!

 

No problem! Until you came along, it wasn't much of a thread

I suppose if you hit "record" on your lap top and the LM1 meter at the same time, you'd be able to link the recorded data from both sources on an Excel spreadsheet using "run time" as the common variable, but I don't know how accurate it would be. You would definitely need "run time" broken down by seconds.

The RPM cable, while somewhat expensive, not only allows you to record the RPM vs. AFR data, it also has 4 other terminal inputs for other things like TPS data, etc.

For me, the biggest benefit of the LM1 is that it provides A/F ratio data in open loop (cold start, WOT), which are the two areas I need the bulk of my tuning done. Once my car enters closed loop, it's pretty much right at 14.7:1.

It has an analog output port to hook up a gauge to it if you'd like.

I actually used it for the first time this weekend, but my current tune is so rich in cold start / open loop, that the plugs foul quickly, making things difficult. I still need to review the data that I recorded, just to see if everything functioned properly.

 

It does not matter where you tap the TPS sensor from an electrical point of view. Tap into it where ever you think it is easiest with the least amount of wiring.

 

Thats great info. My tunning needs to be helped at WOT for sure. Cold start it might be a little bit rich but won't know for sure until I get one. Just curious where everything else is to. So, where are you going to plug into the TPS at?

 

I wound up splicing into the wires about 6 inches from the sensor. The RPM converter cable instructions recommended to pick up the ground as close to the sensor as possible for accuracy, so I picked up the voltage there as well. I'll check the LM1 data log info tonight to see if everything recorded successfully.

 

cool, let us know how yours is doing.

 

I reviewed the data last night. Good news - it did actually record the A/F, RPM and TPS info. Bad news (as I suspected), it stopped recording after about 30 seconds, for each of the 3 times I tried to record. Not sure why, as the internal memory was not reading "full". I'll need to investigate this weekend.

I also messed up setting the RPM signals because it recorded my RPM information as double what it really was. This is hopefully an easy fix, though NOTHING pertaining to this car is ever easy

I'll be back at it this weekend...