Boost pressures

[RTechUK]

Mines a K03 not a K03S
I know my torque figures when mapped were good (close to the K03s)
but I was slightly down on BHP
looking at my boost gauge it starts from -8 so I need to know is anything above the -8 in boost or is it from the 0 that I'm on boost?

thanks for the replies so far guys I appreciate it

You got ARZ engine code then?

The boost for a turbo car is called MAP (map manifold absolute pressure) not gauge pressure.

-1  = negitive pressure  = vacuum in the manifold = engine is sucking the air in
 0  =  transition void with the pressue reaching atmospheric pressure around 1000mb
+1 = On boost = The air is being forced into the engine from the turbo

If you took you 1.1bar gauge reading you would get a MAP reading of 2100mb, its this what you will log with vagcom.

The k03 will still happy peak 1.3bar 225+lbft but the boost tails off quicker making less peak bhp. 
 
When your car peaks to 1.1bar does it drop of to lower boost? and what boost are you seeing in 4th around 4500-5000rpm as this is the window for peak power from the boost.

(Again you really need to know whats being asked of the boost from the ecu.)

[Hulmie]

Anything below 0 is vacuum, anything above 0 is boost.

[RTechUK]

 Robs comment the on the dyno when we had the lambda and boost gauges on both the 42" plasma screens, he shouted "It looks good its booting to -20psi."       My reply "carry on cleaning the bog"

[Dalo Harkin]

Mines a K03 not a K03S
I know my torque figures when mapped were good (close to the K03s)
but I was slightly down on BHP
looking at my boost gauge it starts from -8 so I need to know is anything above the -8 in boost or is it from the 0 that I'm on boost?

thanks for the replies so far guys I appreciate it

You got ARZ engine code then? Yes

The boost for a turbo car is called MAP (map manifold absolute pressure) not gauge pressure.

-1  = negitive pressure  = vacuum in the manifold = engine is sucking the air in
 0  =  transition void with the pressue reaching atmospheric pressure around 1000mb
+1 = On boost = The air is being forced into the engine from the turbo

If you took you 1.1bar gauge reading you would get a MAP reading of 2100mb, its this what you will log with vagcom.

The k03 will still happy peak 1.3bar 225+lbft but the boost tails off quicker making less peak bhp. 
 
When your car peaks to 1.1bar does it drop of to lower boost? and what boost are you seeing in 4th around 4500-5000rpm as this is the window for peak power from the boost. Yes it peaks to 1.1 and then drops off to anything between 0.5 and 1 then in 4th at the RPM you say it holds 1bar

(Again you really need to know whats being asked of the boost from the ecu.)

See comments above

[RTechUK]

Mines a K03 not a K03S
I know my torque figures when mapped were good (close to the K03s)
but I was slightly down on BHP
looking at my boost gauge it starts from -8 so I need to know is anything above the -8 in boost or is it from the 0 that I'm on boost?

thanks for the replies so far guys I appreciate it

You got ARZ engine code then? Yes

The boost for a turbo car is called MAP (map manifold absolute pressure) not gauge pressure.

-1  = negitive pressure  = vacuum in the manifold = engine is sucking the air in
 0  =  transition void with the pressue reaching atmospheric pressure around 1000mb
+1 = On boost = The air is being forced into the engine from the turbo

If you took you 1.1bar gauge reading you would get a MAP reading of 2100mb, its this what you will log with vagcom.

The k03 will still happy peak 1.3bar 225+lbft but the boost tails off quicker making less peak bhp. 
 
When your car peaks to 1.1bar does it drop of to lower boost? and what boost are you seeing in 4th around 4500-5000rpm as this is the window for peak power from the boost. Yes it peaks to 1.1 and then drops off to anything between 0.5 and 1 then in 4th at the RPM you say it holds 1bar

(Again you really need to know whats being asked of the boost from the ecu.)

See comments above

Yes it peaks to 1.1 and then drops off to anything between 0.5 and 1 then in 4th at the RPM you say it holds 1bar

You really need a logging session of blocks 020 114 115 to make sure your car it doing what it should.  Where are you from? as there is a list somewhere of members with VCDS who are willing to help you do a log, in return for a bigmac and fries

You

[Dalo Harkin]

Lol - I have vagcom but havent read the user manual (infact I havent even unwrapped the cable  )

I live in Stockport, I have had a PM from a member who is going to help me for some KFC