GolfGTIforum.co.uk
Model specific boards => Golf mk4 => Topic started by: Dalo Harkin on 22 September 2011, 12:34
-
Looking at some posts on here, I want to double check my boost pressures:-
I have a stage 1 remap from Carbon, a CAI and some other small mods, deleted N249 etc
my boost peaks at 1.1Bar (which I think from conversion is just under 16psi) is this lower than it should be?
any ideas what it could be? as I have deleted the N249 surely there should be no boost leaks, checked around the pancake filter etc and there is no leaks
-
my mods are all in my SIG pretty much, and im peaking at 19, holding 18 then tailing off to 15 around 5000rpm. mine is a REVO remap.
so to me, yours does seem pretty low. what DV you using? and have you checked all your breather pipes under the inlet manifold?
james
-
It's a forge 007p
when you say the breather pipes do you mean the maze of cr*p that was on the underside of the plate where the N249 is/was?
I have completely removed that plate, or do you mean the PC pipes?
I have looked as much as I can and cant see anything
-
it will boost as much as it needs to to meet the requested load/torque/power. More boost doesn't always necessarily mean more power.
-
I just want to check that its not lower than it should be - indicating a boost leak.
-
Mine peaks at 20 holds 18 till 5000 like James then.tails off to.16 so my top end is what your hitting so het it checked might ne intercooler check.oy
-
Mine peaks at around 18/19psi
-
Ok, so sounds like I have a leak :sad:
Can someone suggest the 'culprit' spots.
* Either side of the SMIC
* PCV pipes
anywhere else?
-
1.1bar is around stage 1 BHP from a k03s.
The peak / inital spool up is what makes the torque band strong. A 1.3bar peak can work out to around 225+lbft where 1.1bar peak would be 190-200lbft. You could have about the same amount of peak bhp as the guys running 1.3bar boost peak, but you will have less of a kick down low and less average hp.
You need to speak to your tuner and find out what the map should peak to, 1.1bar is a very safe map and the peak boost might be bang on the money and you ca stop looking for the extra boost. :smiley:.
But if they tell you it should be around 1.3bar peak, then you will need to carry out some logs of the boost / load control with VCDS to find out why your not hitting the target load / boost. If all the boost system is air tight then I would put my money on the wastegate / actuator, but the logs will show this for you.
-
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
-
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.)
-
Anything below 0 is vacuum, anything above 0 is boost.
-
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"
-
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
-
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
-
Lol - I have vagcom but havent read the user manual (infact I havent even unwrapped the cable :grin:)
I live in Stockport, I have had a PM from a member who is going to help me for some KFC :smiley: