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Discussion Starter · #1 ·
Hi,

I have spent the last few days trowling through all the previous topics on bleed valves / manual boost controllers, but are still a bit confused.

I have just brought a mint 9000 CSE 2.3 FPT, it has done 158,000 miles, but has full saab specialist service history and runs like a dream, apart from the fact that on occasions the boost seems not to be constant. When I floor it, the APC goes initially into the low red section, then drops to the broken yellow red section, but when it drops it is very noticable.

Will getting a Bleed valve / MBC solve this and also allow a little extra power ?
 

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A bleed valve won't normally solve problems of erratic boost, but an MBC will if your APC solenoid is faulty.

The operation of the APC you describe sounds normal to me- perhaps someone with an APC 900 will be able to comment though.

[edit] I forgot, both will allow you the potential to unleash some extra power, but make sure everything else is OK first.
 

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Discussion Starter · #3 ·
thanks for the reply mark,

I thought after reading lots of topics that my apc is showing correct boost, but you can just feel it falling away then coming back and it does this a few trimes during so called full boost, although the gauge stays the same.

Will an Abbott racing MBC be good for my car ? I did have one of there's fitted to my previous abbott racing 240 bhp 900 se turbo, and that worked wonders, made such a difference.
 
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