View Full Version : Bars
NewV
December 5th, 2006, 09:27 AM
Probably a very dumb question but one I feel I should understand before I melt something. What exactly is meant by 1 Bar, 2 Bar and 3 Bar?
ScarabEpic22
December 5th, 2006, 09:48 AM
Pretty sure it is the MAP pressure when going into boosted modes (2, 2.5, 3 Bar), I know 1Bar is regular tuning which is what most (if not all) cars/trucks come with. The 2Bar, 2.5Bar, and 3Bar OSs give more tables for tuning under boosted conditions allowing better performance when boosted.
eboggs_jkvl
December 5th, 2006, 09:53 AM
Places where you drink or if in FI situations. 14.7 PSI is 1 bar, 2 bar is double that and so forth. It refers to Pressure. I run 12.5 PSI on top of the 1 bar 14.7 PSI so I'm not quite 2 bar under full boost.
I sure hope I got that one right! :D If not, I'm sure I'll hear about it.
Elmer
NewV
December 5th, 2006, 09:57 AM
Places where you drink ...
Elmer
I understand that first part. :cheers:
So if you are refering to MAP at double boost for 2BAR what controls that boost? Assuming richer AFR and more spark?
joecar
December 5th, 2006, 10:14 AM
1 bar = 1 atm = 101.3 kPa = 14.6 psi
bar is a unit of pressure.
Normally aspirated (non-booted) creates maximum MAP of 1 bar (atmospheric);
Forced Induction (boosted) creates maximum MAP above 1 bar:
2 bar = 1 bar boost + atmospheric, 3 bar = 2 bar boost + atmospheric;
each requires the correct MAP sensor and sensor scale factor (in the COS).
What controls boost:
SC: speed of impellers (driven via belt by engine crank);
TC: exhaust gas flow and waste gate (controlled by several different methods).
TAQuickness
December 5th, 2006, 10:20 AM
1 bar = 1 atm = 101.3 kPa = 14.6 psi
bar is a unit of pressure.
Non-boosted: 1 bar (max MAP = atmospheric);
Boosted: 2 bar (1 bar on top of atmospheric), or 3 bar (2 bar on top of atmospheric); each requires correct MAP sensor (and COS).
Then there's the whole inertial supercharging thing... !split hairs.
I owe you an ftp transfer.
joecar
December 5th, 2006, 10:24 AM
I edited my post to add more info.
TA, no worries, take your time on the ftp transfer.
NewV
December 5th, 2006, 11:01 AM
Thx Guys, I get it:
My car normally aspirated is 1 Bar. With a Super or Turbo Charger depending on my boost I can be higher Bar. Essentially a 3 Bar engine is one mean mofo.
joecar - I found a bolt what should I do with it?
Tordne
December 5th, 2006, 11:28 AM
I owe you an ftp transfer.
Am I owed one :muahaha:
joecar
December 5th, 2006, 01:53 PM
Thx Guys, I get it:
My car normally aspirated is 1 Bar. With a Super or Turbo Charger depending on my boost I can be higher Bar. Essentially a 3 Bar engine is one mean mofo.
joecar - I found a bolt what should I do with it? NewV,
If you found a bolt, then it is not a lost bolt anymore, so I am not in charge of it. :D
Joe
Edit: Or just post it (the bolt) in the Lounge in the Lost Bolts thread. :cheers:
TAQuickness
December 6th, 2006, 01:06 AM
Am I owed one :muahaha:
Just some pics of my dirty tailpipes. IF you really want to see them, let me know.
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