Okay, I had this idea but I'm not sure how well it would work. If we were to take a 3-bar MAP sensor (JDM/UK EVO, GM, whatever) and feed it into a sensor input that EvoScan is currently capable of monitoring, then we could possibly log actual boost. Of course, you'd need to find a sensor that won't cause problems if you unplug it.

So, what about the rear O2? EvoScan can report the voltage. Disconnecting it doesn't seem to do anything other than setting the SES light. All you'd have to do is to create a new transfer function/equation in EvoScan.

Of course, if the input resistance isn't well-matched to the sensor used, you're resolution might be poor, but it could be worth trying, right?

Okay, so who's up for trying it?

 

02 sensors read in millivolts and it usually between 0-1.5v

a 3bar map reads 0-5 volts and you would also have to build a definition in the rom to associate a certain voltage with boost.

 

There has been some talk of using the JDM MAP sensor instead of the USDM one, but the one I was hoping to get never showed up.. the JDM map sensor is 3 bar, but I'm not sure what would have to be done for it to read correctly.

 

doesn't our ECU have spare inputs that can be logged? I know on the DSM ECU they have all kinds of extra input they can use for things like n2o control and stuff.

 

Just because the sensor only puts out 1 volt doesn't mean the ecu can't read 5+ volts. Dsm ecu's can log a wideband or map sensor on the rear O2, I bet an Evo ecu could do the same.

 

There are inputs and outputs on the DSM ecu's that can be used.

There are a bunch of them, I can probably only remember half of them, some of them can only be used in special cases. Egr temp, rear o2, manifold differential pressure sensor(mdp/map sensor). Intake temp, barometric pressure, and front 02 can be used in special cases. FP solenoid, and boost control solenoid are the only two outputs that come to mind, but there are probably more.

I'm pretty sure you guys will have most of this stuff available to you in time.

 

THere are actually also a half dozen or more ECU pins that are unwired too.. I am fairly certain that the ECU can utilize them if someone wrote code to do it.

 

This would be such a nice feature to incorporate into ECUFlash..

 

Just hook up EvoScan and read the voltage on the rear 02 while you send a signal from 1v to 5v to see if the ECU can see that range

 

not ECUFlash, but Mitsulogger or EVOScan would be great.

 

sorry typo.

 

I've got a JDM Evo IX MAP sensor lined up. I should have it by next week. Once I get it, I'm going to take it into my lab at work and measure output voltage vs pressure. I'll do the same for the USDM MDP sensor.

 

How much was the JDM sensor?

Do you have a Mitsu part number?

 

11,700 JPY. At the current effective exchange rate, that's about $100 + bank transfer fee + shipping. If it turns out that they can be used, I can order up a big batch of them.

No part number yet. I forgot to ask.

 

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