You can plot engine rpm vs GPS speed to see wheelspin.

 

well not exactly unless both back wheels are spinning but l'm not sure you learn much from knowing you are lifting an inside wheel because you generally feel it to know it anyway.

 

Sorry about bringing this thread back to life, but since I recently just purchased the MaxQData MQ200-RT and will be doing the install in the next week or so, I started digging into what I'm going to need to tap into, and came across this perfect thread.

With the MQ200-RT, I have 4 analog and 2 pulse inputs, and was thinking of getting the following data:
tps
vtec
map
brake (on/off... put prefer pressure/position)
rpm (pulse)
speed (pulse)

On 11-17 I saw in the service manual that it indicates a 12V (standard battery voltage) for vtec vs. 5V in this thread. Am I misreading this or am I looking at the wrong location? Since the MQ200-RT needs 5V, I sure hope that I missing something. Any help/clarification on this?

Also, just to share on this thread, on 11-16 indicates that the brake pedal position switch (white/black) is also 12V when the brake is pressed.

As always thanks for any help on this.

-Dave

 

The service manual will always trump this thread. If it says 12V then it is.

That said, the vtec signal is a waste of time. You should never leave vtec on the track so it doesn't offer any interesting information.

 

Sorry, only DL1s work with the S2000.

On a more serious note... My guess is if your just looking for an on/off type signal like brake or VTEC, that the 12v is going to trigger it just fine. It will just peg the reading at your max allowed voltage without hurting anything. You can check with Ed (MaxQ, good guy) to be sure.

Personally I see no need to log VTEC. TPS, Brake & steering angle (requires additional sensor) should be your priority for your analogs. RPM & speed (preferably GPS) also.

 

Since I'm nowhere close to being a tech, I didn't know if I was looking at the wrong thing or misunderstanding it. I figured I'd better be safe than sorry.

This is great stuff, even more than I asked and likely would have eventually started another thread. Since we're going this direction, here is some background on what I am trying to do.

I'm starting my 3rd year autocrossing with the S2000 and wanted to step up my driving skills so I could potentially be competitive at the divisional level and respectable at my 1st attempt at Nationals. I figured that with feedback immediately after the runs, would help me at the current event, but being able to overlay the MQ200-RT data via Trackvision.net's dashboard program on my videos, would also let me know where I need to focus. (i.e. braking, not shifting where I should, falling out of VTEC, etc.) If you guys have better suggestions on what needs to be monitored for this situation, as Ross Perot would say, "I am all ears".

BTW, I have attended multiple Evolution Schools (Phase 1 and 2), but I am more of a "feel the car" type of driver. I find that sometimes I can get near the top in PAX while others, just in the top 10 or so. I am hoping that with the data on top of my videos would help me better understand why. Of course, there will be times where I still won't get it, and I can post it to folks like you guys to let me know what I am doing well and not so well.

Yes, I do know that this is likely to be overkill for autocrossing, but I do see that once I get my driving skills decent at the autocross, it will just make me a better driver and have some confidence at the track where the stakes are higher when there is a driver's error. Also, I would have a good data logger for that as well.

These are valid points that it is an on/off indicator. I wanted to make sure I got my understanding right regarding the S2000, before bugging Ed. I really was hoping that I was just misinterpreting the manual. Since I'm getting the impression that I am not off base, I'll send him images of those pages and get is "okay" before I connect 12V where his unit is expecting 5V.

Thanks again to you guys, and look forward to being a good study.

-Dave

 

Bumping this thread for a little help. I found the red/black wire at c27 for the TPS, tapped into it and read .5 - 4.5v with my multimeter. Satisfied, I connected that to analog 1 on the dl1. I then found a white/black wire along the driver's side door sill that gets +12v when the brakes are pressed. I connected that to analog 2 on the dl1. I tapped the tach signal and connected it to the 'rpm/tach' input on the dl1.

When I fired up the car, I had no tach output on the gauge cluster. I unplugged my tach feed into the dl1 and the tach on the cluster began working properly. Also, in my logged data, both analog 1 and analog 2 are flat lines at zero. Any suggestions as to what I did wrong?

 

Sounds like a ground issue.

 

talk to Jeremy Lucas. They have a setup to fix it. It's a problem with that generation DL1.

Just remove the rpm wire from the DL1 in the mean time.

 

yeah, I removed the rpm wire. Still no joy from the analogs, though. I'll give Jeremy a shout.