brandon6.0

iTrader: (32)

Hey i have a 2bar os sd setup on my turbo silverado. The other day i noticed while tuning that my 2bar map was only reading 105kpa and flatlined. I was on 5psi at the time. My question is this, i have a 3bar map thats new laying around. Can i run or use it with a 2bar os? Thoughts?

Thanks.

stevieturbo

Test the sensor, if it is not reading correctly either it's faulty, no pipe is attached, wiring is faulty or your ecu is not configured correctly.

Rawr256

You are scanning the 2 bar map sensor correct? Been there done that wondering why I was maxing the map out at 105 knowing I had a 2 bar.

Yasei

iTrader: (1)

A 2bar sensor will only read ~1bar (~100kPa) boost, which is ~2bar absolute pressure.

OP: what is your MAP reading with engine off?

stevieturbo

In correct units, 100kpa, or thereabouts should be atmospheric, and as such a 2 bar should read to 200kpa, or thereabouts.

brandon6.0

iTrader: (32)

I will connect scanner tomorrow and get a reading with engine off. Could be a bad sensor. If it was wiring it wouldnt read at all. Still have to ask could the 3bar sensor work??? I would think so and only read to 200kpa right?? Bc thats what the the 2bar os ve table goes to. I would need a 3bar os system to have a table past 200kpa corrct??

Yasei

iTrader: (1)

Hmm, maybe you're using hptuners... Check your pids how they are configured.

I doubt your sensor is bad, it's more likely a tuning software issue. I initially though about the sensor settings in your tune (that's why I asked for the reading with engine off), but I use more Efilive so didn't remember some hptuners specific things like different pids required after applying a COS etc.

brandon6.0

iTrader: (32)

Yea hptuners. Imma try adding a few psi to it with engine off and see how it reads as well. Ill report back.

Yasei

iTrader: (1)

~100kPa is atmospheric (absolute pressure). 2bar sensor will read ~200kPa absolute pressure or ~100kPa boost.

3bar sensor will read up to ~300kPa absolute pressure or ~200kPa boost. Most OEM PCMs have limits as well, some flat line to 255kPa no matter how high the sensor would measure. Some don't accept negative MAP sensor offset values which may limit the sensor choice.

When OP talks about "being at 5psi" I'm assuming that means 5psi of boost, which is ~135kPa absolute pressure.

stevieturbo

Any sensor can work and display within it's range if it is all calibrated correctly.

brandon6.0

iTrader: (32)

I figured it out. I forgot to add the 2bar map into the scan table. So it basicly wouldnt read anything above 105kpa without it. Dummy for not thinking about that. Lol.

Between tuning the wifes tbss and mine things get moved around on the sanner. Thanks guys.

denmah

iTrader: (2)

yep, i have a 2 bar config if you didnt figure it out haha

Yasei

iTrader: (1)

Yeah, that's exactly what I thought when I realized hptuners... So the sensor was calibrated correctly and did give correct info for your PCM, but you just couldn't display it correctly.

brandon6.0

iTrader: (32)

Yes. Without the table setup properly hptuners want show info in histograms. Stupid mistake lol