logging boost with aem tru boost

evokid511 · Oct 27, 2009, 10:37 PM

so im trying to log boost with my tru boost into evoscan and i bought a serial to usb cable and bought a serial port and connected the logging wires from the gauge to it... i have a uego and tru boost and read that you have to connect the blue logging wire to the 2nd port on the serial cable and then a ground wire to the 5th port... now i plugged it in booted up evoscan and plugged in my boost to log and it was way off said 47lbs at idle... so figured maybe something was wrong with the wire but i plugged my uego in and it worked perfect so i dont know why the boost wont work right... does the boost logging wire need to be tapped to a different port???

any help is much appreciated

fostytou · Oct 27, 2009, 11:23 PM

Does the tru boost even have serial logging? I'm 99% sure that second plug is for plugging in an external AEM pressure sensor.

fostytou · Oct 27, 2009, 11:28 PM

Yeah, definitely no place to plug in a serial connector. Hope you didn't torch anything http://www.aempower.com/images/produ...%2030-4350.pdf

evokid511 · Oct 27, 2009, 11:29 PM

im not positive but it does register in evosscan so im guessung it can be done... on the uego the blue wire is for logging so im assuiming that the blue wire on the tru boost is for logging also... the white wire is for the aem ecu i believe

evokid511 · Oct 28, 2009, 11:00 AM

i should mention it is the gauge display only not the boost controller type so my wiring is different then the above diagram you posted... i have 4 wires red black blue white... red power black ground blue should be for logging and white for an aem ems

evokid511 · Oct 28, 2009, 05:20 PM

bump??

**MR Turco** · Oct 28, 2009, 06:13 PM

AEM's website says: One (1) low-side output included for warning lights

I don't believe you can log tru boost.

evokid511 · Oct 28, 2009, 09:03 PM

Quote:

Originally Posted by MR Turco

AEM's website says: One (1) low-side output included for warning lights

I don't believe you can log tru boost.

hmmm damn... how are people logging boost then, if your using a manual boost controller?

fostytou · Oct 28, 2009, 10:24 PM

Quote:

Originally Posted by evokid511

hmmm damn... how are people logging boost then, if your using a manual boost controller?

JDM MAP or any other boost sensor wired in to the MDP sensor slot.

However, if you have the "boost digital display gauge/ boost pressure gauge" then you CAN log it via serial (the tru boost is a boost controller, you think you have the wrong product)

http://www.aempower.com/ViewCategory.aspx?CategoryID=73
http://www.aempower.com/images/produ...%2030-4406.pdf

Reading the instructions as one normally does points you to their forum for advanced installation instructions.

That said, i'm not sure how you would interface this with Evoscan unless you tricked it into reading it as WDB and changed the calculation. If this was the case you would not be able to log another external wideband. You could optionally wire it through the rearO2, or fuel temp ADC input, but logging a JDM Map would be just as easy.

biggie5252 · Oct 28, 2009, 10:29 PM

If it is just the gauge and not tru boost, you might try the Aem forums.

evokid511 · Oct 29, 2009, 06:42 PM

you guys are correct i was under the assumption that it was still called a tru boost even without the boost controller but now i see that it is just a disital display gauge.... on those instructions it says the blue wire is for a rs232 which is a serial port so it should be able to log through a serial cable, i posted on the aem forums with no luck so far, just hoping someone on here has done the same or tried

vladdyyy · Oct 29, 2009, 07:57 PM

hey im trying to log boost but my stock solenoid died so i replaced it with the aem one that comes with the truboost controller... on evoscan it says boost spikes to 22 then 36...which shouldnt be right. on my gauge it says 18psi...

evokid511 · Oct 29, 2009, 08:08 PM

^hmm idk whats going on with that, mine has a similar prob but says im spikings 47 lbs at idle