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Ms3 Basic - Brake Pressure Sensor

Old 03-04-2016, 10:49 AM
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Default Ms3 Basic - Brake Pressure Sensor

I've got the base optioned ms3 basic with a can wb02/obd2 module installed. I've also got a racecapture on order and plan to data log over the can bus.

Is there an easy way for me to feed a brake pressure sensor into the ms3 so that I can log it via an obd2 or can bus program?

My Ms3 basic has the following pins available on the db37 from rev.
-1 fused 12v
-2 ground
-3 sensor ground
-4 wideband in
-8/9 CanH/L
-19 Nitrous 2 Output
-20 EBC out
-23 Nitrous In
-36 VVT

TIA
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Old 03-04-2016, 11:08 AM
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I would assume if you found a 0-5v sensor that you could tee into brake pressure line you could possibly do it.
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Old 03-04-2016, 11:32 AM
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Originally Posted by EErockMiata View Post
I've got the base optioned ms3 basic with a can wb02/obd2 module installed. I've also got a racecapture on order and plan to data log over the can bus.

Is there an easy way for me to feed a brake pressure sensor into the ms3 so that I can log it via an obd2 or can bus program?

My Ms3 basic has the following pins available on the db37 from rev.
-1 fused 12v
-2 ground
-3 sensor ground
-4 wideband in
-8/9 CanH/L
-19 Nitrous 2 Output
-20 EBC out
-23 Nitrous In
-36 VVT

TIA
If you haven't figured out the plumbing yet for the sensor I'd suggest this. I used it on my last miata and it makes it plug and play.

Russell Brake Light Switch Banjo Bolt Harley 3 8 24 10mm Master Cylnd 1 8 27 NPT | eBay

Did you get the racecapture pro? or the new obd only one? I'd use the analog in on the RCP if you have the pro version.

If not then you need to find a spare analog in on the ms3 board. wideband is reserved only for wideband even though your passing that data to the ECU via CAN.

if you need IO expansion for more analog inputs something like this is probably your best bet.

TinyIOx v1.0 Board
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Old 03-04-2016, 12:34 PM
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You need a 0-5v input. Out of the ones listed you can use wideband in. The rest of them aren't 0-5v inputs.

If you just want one brake pressure sensor you should be able to use the wideband in, if you want 2 you need to come up with a different way to do it.

Something like the TinyIOx will need conditioning circuits built though.

I'm using this sensor, haven't wired it up yet though. Front is in my line lock spare port, rear will go in a 3/8-3/8 with an 1/8npt port union at some point, haven't gotten around to it though.

1000PSI NPT1 8 Pressure Transducer or Sender for Oil Fuel Diesel Gas Air Water | eBay
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Old 03-04-2016, 12:57 PM
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Originally Posted by aidandj View Post
You need a 0-5v input. Out of the ones listed you can use wideband in. The rest of them aren't 0-5v inputs.

If you just want one brake pressure sensor you should be able to use the wideband in, if you want 2 you need to come up with a different way to do it.

Talking with Rev he said the MS3 wideband analog input was reserved and could not be re-purposed for anything else. But maybe that's only for his version of the MS3.
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Old 03-04-2016, 12:59 PM
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Yep, looks like you are correct. So I take that back, none of those inputs will work for it, you will need some sort of extension board, or do some modifications inside the case.
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Old 03-04-2016, 02:34 PM
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You have a V2.3 unit. This unit has the following analog inputs available:

11 EXT_MAP Input
12 SPARE_ADC Input
16 EGO2 Input

You can use any of these 3.
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Originally Posted by ninerwfo View Post
The “into to megasquirt thread” mentions that the MS3 basic has 5 inputs with built in pull up resistors - and I was just wondering why it would have so many, while the MS3Pro PnP has just 2 (with no pull ups?)
MS Labs: Plug and Play Megasquirt ECUs for ANY 90-05 Miata (NA, NB1, NB2 w/VVT, MSM), including basemaps to get you started ASAP. PM me or email or details.
For support on MS Labs ECUs: Please email, be sure to include the unit's serial number and include a datalog and your current map.
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Old 03-04-2016, 03:24 PM
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Originally Posted by shuiend View Post
I would assume if you found a 0-5v sensor that you could tee into brake pressure line you could possibly do it.
Fortunately I have the 949 wilwood master cylinder so I have plenty of spots I can hook up an npt sensor too without having to T the lines.

Originally Posted by cyotani View Post
If you haven't figured out the plumbing yet for the sensor I'd suggest this. I used it on my last miata and it makes it plug and play.

Russell Brake Light Switch Banjo Bolt Harley 3 8 24 10mm Master Cylnd 1 8 27 NPT | eBay

Did you get the racecapture pro? or the new obd only one? I'd use the analog in on the RCP if you have the pro version.

If not then you need to find a spare analog in on the ms3 board. wideband is reserved only for wideband even though your passing that data to the ECU via CAN.

if you need IO expansion for more analog inputs something like this is probably your best bet.

TinyIOx v1.0 Board
I bought the new Racecapture model, I do not have the pro. The TinyIOx board looks like a good solution.

I don't seem to have any spare inputs on my MS3. Maybe it would be even cheaper to just send it to Rev and pay him to add the extra inputs. I should likely contact him to see what he says.
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Old 03-04-2016, 03:25 PM
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I think you missed Revs post. It has the 3 extra inputs.

TinyIOx board is a very DIY solution. You need to build conditioning circuits for all the inputs.
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Old 03-04-2016, 03:45 PM
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Originally Posted by aidandj View Post
I think you missed Revs post. It has the 3 extra inputs.

TinyIOx board is a very DIY solution. You need to build conditioning circuits for all the inputs.
I had my post drafted and walked into a meeting and then blah blah blah. Yeup, totally missed his post.

This is pretty sweet news! All hail the mightly ms3(notatall)basic
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