2 Bar MAP Off Set Values

[titanium_skeleton]

Just looking for the correct values for MAP off set and MAP Linear.

I Have a GM 12615136 2 bar map With Hp tuners 2 Bar OS. When I flashed to New OS these values were already there Linear 200 offset 10.33

But reading the Forms I see linear 200 offset of 8 kPa
Even seen 212 an 9

What the correct values It's on a 2000 Corvette LS1 Running A&A vortech v3 supercharger 8-9 LBS Boost with inercooler . 60 LBS Semia Deca injectors. an Hp tuners 2 Bar OS

[5_Liter_Eater]

The correct values are 200 and 8.0 although I use 200 and 8.33 to get it to 101 kpa with key on, engine off.

Pretty good thread here. Same MAP, your part number superceeded the one mentioned in this thread.

http://www.hptuners.com/forum/showthread.php?t=11480

[titanium_skeleton]

I am In Calgary Alberta 3750 feet above Sea Level. With the the 200 an 10.33 setting. Just took a look at my last log key on engine off 90.8 cold went for a quick drive 86.4 engine warm. Sound about right ?

Everything was going to plan till BOV started to close an went over 110 kPa forgot to fail DTC's PO108 .. Even tho the OS maxed it out for 200 ...dint work ! Bam fun over,,, power reduction came on game over , please play again

[5_Liter_Eater]

Oh, well in that case I would look up the current baro for your area on weather.com and adjust the offset until it matches.

[DSteck]

Why not find the real calibration data for the sensor and just trust that? Barometric pressure changes all the time.

[5_Liter_Eater]

The real calibration values are in that link.

[DSteck]

Right, but there's talk of changing offset values to get baro to read a certain value.

FWIW, I use 200/8 on that specific sensor, which comes straight from the pdf file.

[5_Liter_Eater]

Why not "calibrate" it?

[DSteck]

That's not calibrating. That's hood rat tuning. Do you have a barometric pressure sensor handy that you can compare it against aside from a lookup value for your general area? Those numbers are apparently good enough for GM.

[5_Liter_Eater]

I disagree Dave, I think its a good idea. I do the same with my IAT sensor. Either way it's only .33 kpa.

Good enough for GM...never thought I'd hear YOU say that, LOL. Since when is good enough for GM good enough for you?

[DSteck]

GM has a lot more resources at their fingertips to calibrate equipment than any of us. Why wouldn't I trust what they provide?

I think it is foolish to push values around just to hit one target. How do you know the linear value isn't what needs to be adjusted? You've got more unknowns than equations, which is not solvable. Assuming one unknown is correct and the other is incorrect is a gross simplification that I personally think is foolish to do.

Barometric pressure can change very easy. I have seen it change by +/- 2kPa throughout the day because of changes in immediate weather.

[backchannel]

[QUOTE=titanium_skeleton;279945]I am In Calgary Alberta 3750 feet above Sea Level. With the the 200 an 10.33 setting. Just took a look at my last log key on engine off 90.8 cold went for a quick drive 86.4 engine warm. Sound about right ?

]

87-88 kpa almost any day in Calgary after logging several years here. Density changes are significant tho'.

[backchannel]

Oh, well in that case I would look up the current baro for your area on weather.com and adjust the offset until it matches.

That is inaccurate and also converted to sea level pressure. You need the conversion they used to get back to the absolute reading. I compared in 3 different dyno cells and 200/8.33 is the closest.

[backchannel]

That is inaccurate and also converted to sea level pressure. You need the conversion they used to get back to the absolute reading. I compared in 3 different dyno cells and 200/8.33 is the closest.

More info-not that it really matters but to be exact............. I didn't inquire whether these gauges were sealed absolute pressure or exposed to atmosphere with some induced error.

[Ben Charles]

I don't have a GM 2-bar (even though advertised as one) but I had to set the offset to 16.30 for it to read my normal KPA level

[titanium_skeleton]

Well I took the car out last night an its a good thing it snowed today. I got 3 runs in and 2 re adjusted VE tables an timing tables. The car with my setup SHOCK me. After setting all MAF setting to fail 3 and MAP high voltage fail 3. First gear no point in hitting boost. unless you own shares in a tire company Second gear roll on around 60 mph shes drifting the back end an you better be ready for some counter steering. Got ride of exhaust popping when throttle closed an down shifting mid to low RPM( corsa extremes an bassine X). Any one that says they Had A full A&A supercharger/ inercooler Kit installed an its not really that much difference for 7000.00 Someone did something wrong on tuning or there engine was screwed before .
HP TUNER PRO RULES

[titanium_skeleton]

Here is a log of the 3 rd run before the snow hit today ! I still have some tuning to do but very very happy customer here

[titanium_skeleton]

That is inaccurate and also converted to sea level pressure. You need the conversion they used to get back to the absolute reading. I compared in 3 different dyno cells and 200/8.33 is the closest.

Thanks I will give these numbers a shot