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How To Measure Boost Psi On X3


Timmy-XR6T

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  • Member For: 15y 5m 16d
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  • Location: Sydney, Inner South

Looking for some help guys.

I'm using an SCT X3 (PN# 3000AU) on an FG XR50T 2010 with LiveLink 6.4

I'm trying to manipulate some of the data logging I've done to see what PSI I'm running at various points.

From what I'm told one way to calculate it is.

1. Convert map_volts to PSI by "map_volts - (2.45 / .17)"

2. Convert baro_press_cal to PSI "baro_press_cal * .14504"

3. Then calculate mapPSI subtract baroPSI

I keep coming up with weird and negative numbers so there must be something I am doing wrong - either the calculation is wrong, or I am using the wrong source values.

Appreciate any advice you have.

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  • Member For: 19y 6m 21d
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Lol.....talk about doing it the hard way!

Log BAP under 'environment'

Log MAP under 'speed density'......Iirc

Psi = (MAP-BAP)/2.036

Same method as a dyno.

Edit: off boost (vacuum) will be negative!

Edited by IH8TOADS
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  • Silver Donating Members
  • Member For: 15y 5m 16d
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Thanks mate - that looks a hell of allot of simpler than my original one.

I'll give it a crack shortly. Thanks again.

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  • Silver Donating Members
  • Member For: 15y 5m 16d
  • Gender: Male
  • Location: Sydney, Inner South

Lol.....talk about doing it the hard way!

Log BAP under 'environment'

Log MAP under 'speed density'......Iirc

Psi = (MAP-BAP)/2.036

Same method as a dyno.

Edit: off boost (vacuum) will be negative!

hi mate - can you let me know if these are the rights values I should be logging on the xcal3

Under Environment: baro_press_cal map_v

Under Speed Density map_v

Not sure if I am looking at the right areas because I am seeing numbers from 12-50 on acceleration - is this normal?

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you just need an iphone (rev) or andriod (torque) apps and this http://www.ebay.com.au/itm/Auto-Car-V1-4-ELM327-OBDII-OBD2-Bluetooth-Diagnostic-/290522962386?pt=AU_Car_Parts_Accessories&hash=item43a48499d2 and you can see it right there on your phone! Plus about 30 other PIDS you can log and save and email to who ever you like!

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that unit will NOT work with iphone/iPod. the buletooth is not compatible ( unless its jailbroken+bluetooth stack)

you need a wifi (kiwiwifi)($50-60 on ebay) to connect with iphones

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  • Waiting for the 1st N/A 12!
  • Donating Members
  • Member For: 16y 11m 18d
  • Gender: Male
  • Location: Sydney

that unit will NOT work with iphone/iPod. the buletooth is not compatible ( unless its jailbroken+bluetooth stack)

you need a wifi (kiwiwifi)($50-60 on ebay) to connect with iphones

Oh yeah not iphone but def works on the Andriod I use it all the time. And if it's boost you want to read then you dont need kiwi wifi, you only need kiwi wifi if you want to read AFR's. But you also have to get an extra o2 bung put into your dump!

Also if your andriod has video out you can use the ASL rgb box to then run the gauges from your phone to your ICC it's ultra cool to be able to flick from over to AUX on your ICC and have any gauge combo you want displayed!

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