2 bar ?
TECH Senior Member
Joined: Nov 2001
Posts: 7,036
Likes: 1
From: Lake Zurich, IL
2 bar can accuretly measure 0 to 200kpa (100kpa ... well actually I think 101 or 102... is 1 atmosphere)
so 0 to 100kpa is 1 atmosphere meaning 0 is complete vacuum, 100 is lack of vacuum (cylinders fully filling)
when you go into boost you're overfilling the cylinders. 8-9psi would be in the 2 bar range (it'd be around 160kpa I think)
The stock computer can't accuretly measure this overfill (boost) w/the MAP sensor since it maxes out at 1 atmosphere.
However, just putting a 2 bar sensor in isn't enough... you need a custom OS (Such as HP Tuners offers) to gain the VE (Volumetric Efficiency) resolution to safely tune it.
Or you can keep the MAF, however I believe that's getting close to the max amount of air the stock MAF can measure...
So basically the 2 bar in your situation would be for if you want to run a speed density tune w/a custom Operating System.
so 0 to 100kpa is 1 atmosphere meaning 0 is complete vacuum, 100 is lack of vacuum (cylinders fully filling)
when you go into boost you're overfilling the cylinders. 8-9psi would be in the 2 bar range (it'd be around 160kpa I think)
The stock computer can't accuretly measure this overfill (boost) w/the MAP sensor since it maxes out at 1 atmosphere.
However, just putting a 2 bar sensor in isn't enough... you need a custom OS (Such as HP Tuners offers) to gain the VE (Volumetric Efficiency) resolution to safely tune it.
Or you can keep the MAF, however I believe that's getting close to the max amount of air the stock MAF can measure...
So basically the 2 bar in your situation would be for if you want to run a speed density tune w/a custom Operating System.
the tune I have know makes good power and drives pretty good with stock maf so I was wondering is it worth the money to change to 2 bar and is it safer/more power for the car.
TECH Senior Member
Joined: Nov 2001
Posts: 7,036
Likes: 1
From: Lake Zurich, IL
if you don't max the MAF then you're probably fine so long as your MAF isn't too far off (if it is then it can be tuned in)
But if you're getting close to maxing the MAF then you definetly should consider 2 bar
Theoretically a 2bar Speed Density tune would make more power over an equal MAF tune since you eliminate a restriction ... but I haven't seen any side by side dynos to demonstrate how much more power (if it's even noticable)
But if you're getting close to maxing the MAF then you definetly should consider 2 bar
Theoretically a 2bar Speed Density tune would make more power over an equal MAF tune since you eliminate a restriction ... but I haven't seen any side by side dynos to demonstrate how much more power (if it's even noticable)
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Originally Posted by horist
if you don't max the MAF then you're probably fine so long as your MAF isn't too far off (if it is then it can be tuned in)
But if you're getting close to maxing the MAF then you definetly should consider 2 bar
Theoretically a 2bar Speed Density tune would make more power over an equal MAF tune since you eliminate a restriction ... but I haven't seen any side by side dynos to demonstrate how much more power (if it's even noticable)
But if you're getting close to maxing the MAF then you definetly should consider 2 bar
Theoretically a 2bar Speed Density tune would make more power over an equal MAF tune since you eliminate a restriction ... but I haven't seen any side by side dynos to demonstrate how much more power (if it's even noticable)
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Originally Posted by RedHardSupra
go wot, look at the graph, at one moment MAF will just flatline at 512g/sec (IIRC)
Who cares if the maf maxes or not? With the better throttle response I obtained when I ditched the maf, I wish I had done it sooner, although I did wait for it to max out first.