SCT Boost in PSI PID vs kpa

StealBlueSho · February 21, 2018, 02:39:21 PM

Anyone else notice that the boost in PSI is about .5 psi off in the SCT X4 PID? 211kpa is about 15.9psi but the Boost PID is showing around 15.4? I wonder why the discrepancy?

211 kpa = 30.60psi

30.60psi - 14.69(1 atm) = 15.91psi..

Curious if anyone has seen this? If the PID is not accurate then its garbage in my book...

FoMoCoSHO · February 21, 2018, 02:48:37 PM

What does you baro pid say?

I suspect it references baro and that changes depending on your altitude.

StealBlueSho · February 21, 2018, 02:59:22 PM

99.00

FoMoCoSHO · February 21, 2018, 03:17:24 PM

So neither is correct, lol...

211 - 99 = 112 KPA = 16.34 PSI

StealBlueSho · February 21, 2018, 03:20:59 PM

I love my ECU..... nothing is ever normal with my car...

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FoMoCoSHO · February 21, 2018, 03:25:29 PM

I wonder if its referencing TIP or MAP?

I'm not running the baro PID so I can't compare.

A cursory glance shows MAP and TIP about 2 PSI different on a random log so maybe that's the discrepancy.

Colorado-SHOBro · February 21, 2018, 09:42:42 PM

not sure if this contributes much but being way the hell up here with much less atmosphere i always factor in my baro pressure to calculate kpa to psi.
my tune commands 191kpa-83kpa(baro)=15.66 psi.
so if someone asks i have a 15ish psi tune.
unless your almost exactly at sea level i feel you should factor it in so you know how much PSI over YOUR atmosphere you're running.
if i used the universal 14.7psi of atmosphere i'd think i was at 13 psi LOL!

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Colorado-SHOBro · February 21, 2018, 09:55:31 PM

and just for giggles . . this is the highest i've driven it
68 kpa baro!

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AJP turbo · February 21, 2018, 10:23:10 PM

Quote from: Colorado-SHOBro on February 21, 2018, 09:55:31 PM
and just for giggles . . this is the highest i've driven it
68 kpa baro!

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Damn I couldn't live there...Cars would be too slow lol....What was that elevation?

StealBlueSho · February 21, 2018, 10:24:23 PM

6000ft?

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AJP turbo · February 21, 2018, 10:33:21 PM

Quote from: stealbluesho on February 21, 2018, 10:24:23 PM
6000ft?

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Oh I think higher...I could be wrong but I think SHOBRO's normal elevation is around 6k and baro is like 80ish

Colorado-SHOBro · February 21, 2018, 10:37:03 PM

IIRC that was ~12,000ft. Don't worry Brad, if you were up that high i would be worried about YOU suffocating!

And yeah the local racetrack i race at is 5800ft. But Brad's tune still got me into the 12's!

FoMoCoSHO · February 21, 2018, 10:49:41 PM

Quote from: Colorado-SHOBro on February 21, 2018, 10:37:03 PM
IIRC that was ~12,000ft. Don't worry Brad, if you were up that high i would be worried about YOU suffocating!

And yeah the local racetrack i race at is 5800ft. But Brad's tune still got me into the 12's!

How much boost are you running?

Colorado-SHOBro · February 21, 2018, 11:24:07 PM

191kpa dsd or 15.6 psi over atmospheric.

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StealBlueSho · February 22, 2018, 09:10:30 AM

Quote from: Colorado-SHOBro on February 21, 2018, 10:37:03 PM
IIRC that was ~12,000ft. Don't worry Brad, if you were up that high i would be worried about YOU suffocating!

And yeah the local racetrack i race at is 5800ft. But Brad's tune still got me into the 12's!

That's insane...