Yeah, I know you were just razzing me. :-) Took it as an opportunity to vent my ongoing disappointment in professional services. I've got a 13 month old, so I know where you're coming from.

 

I know exactly what you mean I used to work in HVAC if you have questions about the units lemme know I can probably answer them for you.

On Topic:
What kind of resolution would be available if I just hacked the 5 bar sensor in there without patch?

 

Resolution with the one-byte variable would be 5*14.5/255 = ~0.3 psi steps in boost resolution. With the 2-byte variable, the min boost step would be 5*14.5/1023 = 0.07 psi. Now that I think about it, since you have an Evo 8, if all you want to do is log boost (and not control boost with the sensor), there's not much that needs to be done besides figuring out the correct numbers for the OBD test limits. Besides fixing the OBD test limits, all that needs to be done is to add the 2-byte boost RAM variable to the MUT table. You'll have to turn off the OBD EGR test. (Do you know how to do that?) It will never work with a 5 bar MAP sensor. You can probably use the existing OBD boost values. What's your ROM ID, and I'll tell you want RAM variable needs to be added to the MUT table. Are you good enough with math to figure out the scaling entry needed in EvoScan for the 5 bar map sensor?

 

Thats not too bad, .3 psi, i will definitely at one point be trying direct boost control.

Why wont the 5 bar work for the EGR test? If its just parameters its only a matter of time to figure them out. I'm proficient in math, computer science major with a BS . I know the 5 bar sensor is 0.5V minimum and 4.5V maximum. Thats 1.25 Bar for every volt .

I do know how to disable tests on the ecu i don't know what thread i saw the egr test in but i can look that up.

1 BAR is going to be 1.3 volts if its as linear as they claim.
Every PSI is going to be an additional 0.054 volts

My Rom ID is the 96420008 variant.

 

subscribed.

 

Well bringing this back to life I'm going to try and get this thing working sometime in the next two weeks. I'll have to find out what the snap all these variables really mean and translate them for the new 5 bar sensor.

 

PM me tomorrow, and I'll give you the RAM address to plug into your MUT table.

 

Will do, hey do you know what the egr offset maps represent?

They don't seem to literally correlate between a 1bar and a 3bar sensor like it would be some easy division or such. Instead the values are just randomly assigned like they are purposely selected so they will never happen.

Likewise the mid VE test seems to be more like a voltage test for fault if the sensor went bad with its values above the maximum. The High VE voltage tests seem to be absolutes that the sensor shouldn't see at low loads..

 

Well i think i have success with the install.

Drove it 20 miles to work with my settings. The only bummer is my ZT-2 unit froze for some reason so the log for the boost on the zt-2 is bunk. I didn't have time to make a custom log spot for the 5 bar unit but using the jdm 3bar log everything appears normal using some math to figure out peak boost.


Settings:
EGR Pressure Diff = 0.02
MAP Scaling for Baro = 250
EGR Map check is the same as in the instructions
Map test 4: Max minus Min = 0.51
Map test 3: High VE Min Voltage = 0.61
Map test 2: Low VE Max Voltage = 0.72
Map test 1: Mid VE min voltage = 0.39
Map test 1: Mid VE max voltage = 4.61

Looks like my hypothesis was correct.

Map test 1 is a voltage constraint for what the sensor should never see, ie short or faulty sensor with over voltage. Map test 2 seems to be a voltage cap for the car out of any boost conditions for egr working. Map test 3 seems to be a spot where the sensor shouldn't goto while running (lowest vacuum?).

I setup a excel chart to help me figure out the settings. I could work out the 3.5bar sensor pretty quickly now.

Edit: Forgot to say the EGR test is NOT disabled no CEL's yet.

 

Got a CEL today

Can't tell which of the values triggered it so i'm going to make them more extreme like the instructions instead of just translating the stock values.

 

Well I think i have it all worked out now. Did a trip to tahoe this weekend without a single issue with the MAP sensor. No CEL's even with a 7000 ft elevation change. I'll post the voltage settings later today.

 

Agh better late than never no?

I think nothing less than the sensor shorting out or being disconnected will trip the CEL light now.

Zeitronix 5Bar settings:
Map test 1: Mid VE max voltage = 4.90
Map test 1: Mid VE min voltage = 0.10
Map test 2: Low VE Max Voltage = 4.90
Map test 3: High VE Min Voltage = 0.51
Map test 4: Max minus Min = 0.51
MAP Scaling for Baro = 250
EGR Pressure Diff = 0.02
EGR Map check 1 & 2:
RPM | Value
750 - 84
1000 - 84
1250 - 73
1500 - 65
1750 - 60
2000 - 55
2500 - 48
3000 - 43
3500 - 23


I've decided to estimate what a 3.5BAR sensor would need for settings.

Zeitronix 3.5Bar settings:
Map test 1: Mid VE max voltage = 4.90
Map test 1: Mid VE min voltage = 0.10
Map test 2: Low VE Max Voltage = 4.90
Map test 3: High VE Min Voltage = 0.51
Map test 4: Max minus Min = 0.51
MAP Scaling for Baro = 175
EGR Pressure Diff = 0.03
EGR Map check 1 & 2:
RPM | Value
750 - 84
1000 - 84
1250 - 73
1500 - 65
1750 - 60
2000 - 55
2500 - 48
3000 - 43
3500 - 23

 

Is the Zeitronix sensor the same as the AEM? I want to do this patch for the AEM 3.5 sensor.

 

I have no idea but i will take a guess they are very close

 

The AEM map sensor is a GM.

The Zeitronix is a Kalvico.

EDIT. I take that back. The newer AEM's do indeed look like Kalvicos as well.