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PostPosted: Mon Aug 26, 2019 8:23 pm 
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Joined: Thu May 21, 2009 1:32 pm
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Location: Deepest Darkest Norfolk
Car Model: 2006 9-3SS 2.0T Aero BSR
Hello

There's a couple of issues I wanted your opinions on, that might be weather related or maybe just coincidental.

Firstly I've noticed on occasion a slight whining sound whose pitch raises with the engine. I can hear it from about 3000 RPM upwards, and although I can't be 100% sure, I think it might tend to happen more in hot weather.

As a test I've tried turning the A/C off, thinking it could be compressor related. I don't think I can hear the whining with the compressor off so could it be that? Or maybe alternator, or something else?

Secondly, and also more noticeably in hot weather, I have experienced a lack of turbo boost when using full throttle. The car is remapped to stage 1, and ordinarily when using full throttle, the turbo boost gauge will enter the red zone and stay towards the last red segment indicating full boost.

I've noticed recently there is a lack of power, and the boost gauge doesn't enter the red area, but just stays at the end of the white area.

Could this be the car protecting itself in the hot temperatures, or maybe a turbo or some other issue?


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PostPosted: Tue Aug 27, 2019 2:44 pm 
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Location: Deepest Darkest Norfolk
Car Model: 2006 9-3SS 2.0T Aero BSR
Just a quick update - this morning on the drive to work, all was fine - no whining and full boost - it was about 24c, whereas yesterday about 32c.

Might make a difference?


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PostPosted: Tue Aug 27, 2019 3:10 pm 
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Joined: Wed Jul 08, 2015 6:45 pm
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Car Model: 9³ Aero 250bhp Maptun, Eibach
Haven't noticed any difference on mine with the heat.

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PostPosted: Tue Aug 27, 2019 3:32 pm 
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Location: Queenborough, Kent
Car Model: 9k, 9-5 Aero & a Jaaag
As far as I’m aware, the engine will reign in the boost a bit when the inlet air temperature is above a certain value, which conceivably would happen sooner in warmer weather. However, I don’t think it would limit it as much as you’re seeing - so it could be a sign of something else, the “boost” gauge on those cars isn’t a true boost gauge as such - think of it more as being an indicator of “engine load” instead.

Probably worth checking all of the turbo hoses (MAF sensor right through to throttle body), if that fails perhaps get a garage to do a pressure and/or smoke test on these - to include that intercooler itself - and/or see if anything comes up on a tech2 code reader.

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PostPosted: Tue Aug 27, 2019 3:39 pm 
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Joined: Thu May 21, 2009 1:32 pm
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Location: Deepest Darkest Norfolk
Car Model: 2006 9-3SS 2.0T Aero BSR
sounds wrote:
As far as I’m aware, the engine will reign in the boost a bit when the inlet air temperature is above a certain value, which conceivably would happen sooner in warmer weather. However, I don’t think it would limit it as much as you’re seeing - so it could be a sign of something else, the “boost” gauge on those cars isn’t a true boost gauge as such - think of it more as being an indicator of “engine load” instead.

Probably worth checking all of the turbo hoses (MAF sensor right through to throttle body), if that fails perhaps get a garage to do a pressure and/or smoke test on these - to include that intercooler itself - and/or see if anything comes up on a tech2 code reader.


Great thanks! It's not just the gauge, but I can also feel it doesn't have the same kick or urgency when not boosting fully. It's fine today so far, but I might check for codes. I am slightly suspicious of one of my injectors, as once in a while get a very quick sudden inturruption of power on full throttle, like a misfire. I think i did have a cylinder misfire code a while back, which cleared so perhaps something is brewing...


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PostPosted: Tue Aug 27, 2019 4:44 pm 
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Car Model: 9³ Aero 250bhp Maptun, Eibach
It is a boost gauge, not load.
The BMW gauges are for load. The Saab gauge will measure boost.
If on standard map you will see the first red bar, on stage 1 map you will see just past the second red bar.

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PostPosted: Tue Aug 27, 2019 5:21 pm 
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Location: Queenborough, Kent
Car Model: 9k, 9-5 Aero & a Jaaag
Ian78 wrote:
It is a boost gauge, not load.
The BMW gauges are for load. The Saab gauge will measure boost.
If on standard map you will see the first red bar, on stage 1 map you will see just past the second red bar.

I'm going by what Karl told me (or at least, what I remember him telling me), he said you can get it to read whatever you put in the map. But of course, he (and/or my memory) could be wrong.

Only on Trionic 5 engine management system is that gauge an actual boost gauge (the clue being a physical vacuum pipe between the inlet manifold and gauge), T7 and T8 are driven by the ECU and are an indicator of engine load (MAF request perhaps?).

Karl's the guy with the authoritative answer ...

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'04 9-5 Aero manual, stage 3
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PostPosted: Tue Aug 27, 2019 8:31 pm 
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Car Model: 9³ Aero 250bhp Maptun, Eibach
Alright Sounds, I fitted an aftermarket gauge as a test and it was seeing 17psi on stage 1.
That's a Maptun remap.
The gauge went to just over the second red bar like I say.
On Standard you will be on the first red bar.
Standard was around 12psi.

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