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Home > Help Needed / General Tech Chat > Lower boost pressure after intercooler install

MrTurbo

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147 Posts
Member #: 814
Advanced Member

Utrecht, The Netherlands

19th May, 2009 at 09:13:40pm

Last weekend I installed an Audi TT intercooler in my Mini (Btw great fit behind grille of the mini, no mods needed, apart from using a Megajolt, distributor doesn't fit anymore).

I took the car for a test drive with no other modifications apart from the intercooler. Before the intercooler was installed the engine was running a standard boost pressure of 10psi. After the intercooler was installed the boost pressure was 8.5 psi.

The actuator measures pressure at the compressor housing. The boost gauge and megajolt are measuring pressure at the plenum.

Could this pressure drop be caused by the resistance of the intercooler and hoses?

Next to the pressure drop the engine was suddenly running rich (both on part throttle as well as on full, measured with wideband lambda gauge) at standard boost level. Before the intercooler was installed the mixture was fine at the same boost level.

I've reconnected the part throttle lean off valve (I blocked it off previously). AFter this mod the mixture was fine again (although still running a bit rich (11,5) on full boost).

Any ideas what could have caused these changes?

Thanks,

Nico

wil_h

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9258 Posts
Member #: 123
Post Whore

Betwix Harrogate and York

19th May, 2009 at 09:24:36pm

A drop of 1.5psi with the addition of an IC and all the hoses is about right.

You need to get the signal for the actuator from the plenum, should solve all your problems

Fastest 998 mini in the world? 13.05 1/4 mile 106mph



On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


Radleigh

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367 Posts
Member #: 1643
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West London

19th May, 2009 at 09:44:53pm

As Wil says.


Got any pictures of the install? *happy*

Lightweight racer coming soon.


MrTurbo

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147 Posts
Member #: 814
Advanced Member

Utrecht, The Netherlands

19th May, 2009 at 10:04:24pm

Good idea, quite stupid i never thought of that...

Will post some pics on thursday!

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