Profec KPa units, dont seem to match scan data

[TYTILIDIE]

I changed my Greddy Profrec b to read in KPA the other day and opened up tuner pro. Right away I noticed it wasnt even close to the same number. Anyone else noticed this?

 

[Tooky]

Re: Profec KPa units, dont seem to match scan data

Is it possible TunerPro is reading absolute KPa across the range (vac/boost) of the MAP sensor, while the Profec is reading in boost KPa relative to atmospheric pressure?

Here's an easy way to tell. Get on the throttle a little to get right at 0 PSI boost. Does TunerPro say 100 KPA and Profec say 0 KPA?

 

[TYTILIDIE]

Re: Profec KPa units, dont seem to match scan data

Ill have to check that out tomorrow. I suppose the relation would always be the same? i.e., if the EBC says 30kpa, then I could learn what that would translate to to the scan tools and just remember it correct? Or am I thinking of this wrong?

 

[sy#2921]

Re: Profec KPa units, dont seem to match scan data

If the profec is not using absolute like tunerpro is then yes you can just remember the offset. I think tooky is right saying your 30kpa would be 130ish on tunerpro since it is using an absolute value and the profec is calculating from atmospheric

 

[Tooky]

Re: Profec KPa units, dont seem to match scan data

Yes I think that could work, but the scan tool might have a small offset like 10 KPA one way or another... Only way is to try and check for sure. I.e. does it read 200 KPA near 15 PSI etc..

 

[turbodig]

Re: Profec KPa units, dont seem to match scan data

Is it possible TunerPro is reading absolute KPa across the range (vac/boost) of the MAP sensor, while the Profec is reading in boost KPa relative to atmospheric pressure?

Here's an easy way to tell. Get on the throttle a little to get right at 0 PSI boost. Does TunerPro say 100 KPA and Profec say 0 KPA?

x2. It's probably gauge pressure vs. absolute.

The Profec only really cares about boost, not what the ambient pressure is.

 

[TYTILIDIE]

Re: Profec KPa units, dont seem to match scan data

That does suck, I was hoping to have a "KPa" gauge in the truck so when I see a trouble spot and dont happen to have the laptop fired up, I could just remember what it was, oh welll.