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Author Topic: Boost pressures  (Read 3341 times)

Offline Dalo Harkin

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Boost pressures
« 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
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ARZ K03s, Oettinger Side Skirts, R32 front, Carbon stage 2, Forge 007p (yellow spring), Forge Actuator (yellow spring), Pipercross panel filter with DSG parts, N249 and N112 deleted, SAI deleted, Carbon canister deleted, Rear wiper deleted, Long Life turbo back custom exhaust with 200 cell sports cat, VR6/G60 clutch kit, Creation Motorsport TIP, Catch can, 'Wellycooler', K04 charge pipe, S3 ported inlet manifold - looks pretty standard on the outside though :)

dellenty69

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Re: Boost pressures
« Reply #1 on: 22 September 2011, 12:42 »
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
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Offline Dalo Harkin

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Re: Boost pressures
« Reply #2 on: 22 September 2011, 12:48 »
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
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ARZ K03s, Oettinger Side Skirts, R32 front, Carbon stage 2, Forge 007p (yellow spring), Forge Actuator (yellow spring), Pipercross panel filter with DSG parts, N249 and N112 deleted, SAI deleted, Carbon canister deleted, Rear wiper deleted, Long Life turbo back custom exhaust with 200 cell sports cat, VR6/G60 clutch kit, Creation Motorsport TIP, Catch can, 'Wellycooler', K04 charge pipe, S3 ported inlet manifold - looks pretty standard on the outside though :)

Offline topher

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Re: Boost pressures
« Reply #3 on: 22 September 2011, 13:05 »
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.
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Offline Dalo Harkin

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Re: Boost pressures
« Reply #4 on: 22 September 2011, 13:13 »
I just want to check that its not lower than it should be - indicating a boost leak.
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ARZ K03s, Oettinger Side Skirts, R32 front, Carbon stage 2, Forge 007p (yellow spring), Forge Actuator (yellow spring), Pipercross panel filter with DSG parts, N249 and N112 deleted, SAI deleted, Carbon canister deleted, Rear wiper deleted, Long Life turbo back custom exhaust with 200 cell sports cat, VR6/G60 clutch kit, Creation Motorsport TIP, Catch can, 'Wellycooler', K04 charge pipe, S3 ported inlet manifold - looks pretty standard on the outside though :)

Offline porter_89

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Re: Boost pressures
« Reply #5 on: 22 September 2011, 13:25 »
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
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Offline Wayne

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Re: Boost pressures
« Reply #6 on: 22 September 2011, 13:31 »
Mine peaks at around 18/19psi
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Offline Dalo Harkin

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Re: Boost pressures
« Reply #7 on: 22 September 2011, 17:27 »
Ok, so sounds like I have a leak  :sad:

Can someone suggest the 'culprit' spots.
* Either side of the SMIC
* PCV pipes
anywhere else?
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ARZ K03s, Oettinger Side Skirts, R32 front, Carbon stage 2, Forge 007p (yellow spring), Forge Actuator (yellow spring), Pipercross panel filter with DSG parts, N249 and N112 deleted, SAI deleted, Carbon canister deleted, Rear wiper deleted, Long Life turbo back custom exhaust with 200 cell sports cat, VR6/G60 clutch kit, Creation Motorsport TIP, Catch can, 'Wellycooler', K04 charge pipe, S3 ported inlet manifold - looks pretty standard on the outside though :)

Offline RTechUK

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Re: Boost pressures
« Reply #8 on: 22 September 2011, 17:57 »
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.

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Offline Dalo Harkin

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Re: Boost pressures
« Reply #9 on: 22 September 2011, 19:40 »
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
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ARZ K03s, Oettinger Side Skirts, R32 front, Carbon stage 2, Forge 007p (yellow spring), Forge Actuator (yellow spring), Pipercross panel filter with DSG parts, N249 and N112 deleted, SAI deleted, Carbon canister deleted, Rear wiper deleted, Long Life turbo back custom exhaust with 200 cell sports cat, VR6/G60 clutch kit, Creation Motorsport TIP, Catch can, 'Wellycooler', K04 charge pipe, S3 ported inlet manifold - looks pretty standard on the outside though :)
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