ranedoss27

iTrader: (4)

Which map sensor is best to go with when switching over to speed density? Its on a stock bottom 2002 z28 with a cam and d1sc.
Thanks

tc3

iTrader: (2)

2 bar is only up to 1 times atmospheric pressure soo ends up being like 14.7 psi of boost.... if your going over that. U should have a 3 bar. If your not planning on going that high then a 2 bar will give better accuracy....

Pulling this off top of my head soo someone please correct me if im wrong

Sweet_SS

^^^ This guy is correct.

Slowhawk

iTrader: (12)

2 bar can be more precise than the 3 bar for tuning. If it's under 15lbs I'd go 2 bar.

You only have 0-5 volts to tune in with. 2 bar cuts in in 1/2, 3 bar cut's it to a 1/3 on drivability table's.

MaxxMitchell

iTrader: (15)

2 bar map plugs into stock location/harness. 3 bar usually requires the older style design and different weather pack connector.

2 bar can be used in applications where you run more than 15lbs of boost, but that is up to your tuner.

In my experience I have not noticed a difference in resolution issues when the 3 bar map is mounted correctly vs the factory style 2 bar.

qqwqeqwrqwqtq

I always recommend just starting out and tuning it 3bar so you don't have to do it over in the future. Everyone says they'll never run over 15lbs of boost.....until they do

2 bar is 15 to 210kpa 5kpa per cell. 400-8000rpm, 400rpm per cell

3 bar is 15 to 315kpa, 5kpa per cell between 15 and 105kpa, 10kpa per cell between 110 and 315kpa. 400-8000rpm, 400rpm per cell.

3bar is more resolution than you will ever need. I don't recall ever tuning one and saying "I wish I had another row that split this one by 5kpa".

NicD

iTrader: (7)

It also comes down to the fact that any of the 3 bar map sensors out there are definitely less accurate than the 2 and 2.5 bar map sensors which I suppose is just inherent in the design of a sensor with a given range. Some of the calibrations also do penalize you by having a smaller truncated 3 bar VE table (20 kpa breakpoints in boost regions and missing the 20 kpa row all together) compared to the 2 bar like the 04 GTOs and some 03+ calibrations but on an 02-fbody you won't have that issue.

My preference is to use the newer 2.5 bar map sensor out there since it's accurate as hell and run a 3 bar OS.

qqwqeqwrqwqtq

Even if by a tiny percentage, certainly not enough to ever effect the driveability or performance of the car. I could try and set something up to read a 2bar and 3bar sensor simultaneously but I believe accuracy and stability should be nearly identical.

If you can tune a 3bar SD car to have perfect fuel trims in every cell up to 105kpa and then perfect air/fuel ratio at every boost level above that, I see no reasoning to back up any resolution argument.

JMO

ranedoss27

iTrader: (4)

so it seems like the biggest factor is how much boost you run and since i dont plan on going above 15lbs any time soon i should just go with a 2 bar since its also easier to install. does anyone have a part # for a 2 bar that plugs right in?

Wicked69

I think this was my 2 bar map. BWD EC1678

Orange99Z

iTrader: (25)

I ordered one for a Cobalt SS. It fit in the intake & plugged right in. I don't remember the part# but I found it on here when I was looking.

gpr

iTrader: (6)

What about a 2.5 bar map sensor, is there one that will replace the factory one? then you'd have best of both worlds, plugs in but gives you a little more boost potential.

The Alchemist

iTrader: (19)

Good info. i never thought I'd go above 15psi, but saw 200kpa a couple times at 6900rpm with my procharger, well, until #7 ringland let go on the stock bottom end. Now that I am going forged, I'm thinking, hey, what's a couple more pounds of boost lol.

Chances are I'll drive it at this level for a while, but a 2.5 bar sensor does sound tempting as another 7psi of boost would put me at 21 or 22 psi of boost.

I didn't realize that the 3 bar map sensor had normal resolution in vacum, that would make normal drivability just as good as it is now.

BigRich954RR

iTrader: (1)

2.5 bar sensor its what im running like it plus 21 psi is getting up there. most people will push to 18-19 psi

I8UR4RD

iTrader: (16)

so hows that build comin anyways?

MUSTANGBRKR02

iTrader: (91)

I thought there was a 3bar MAP that plugged right in now? Off of a Duramax or something.

The Alchemist

iTrader: (19)

It's coming along nicely. The block is prepped just waiting on the keyway to be cut into the crank then it's assembly time.

I'm hoping to get the motor back in the car by May.

FAST LS1

iTrader: (2)

This was my impression as well. I need to buy one if anyone knows the part number?

020NN20

iTrader: (13)

The duramax sensor is actually a 3.3 bar sensor, it plugs right in and is the stock style, and I would like to know if people are running these as well as I plan on going into higher boost this year and already have a duramax sensor waiting to go in!! The duramax sensor part number is 28074366. That is the delphi number on the sensor.

Dennis

PRAY HRD

iTrader: (119)

subscribing. INTMD8....hey Jim, any thought on the 3.3 bar duramax plug and play vs the 3 bar?