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Hi guys,

Since having my car mapped its been great (almost a year ago) however just today I noticed I have less boost in 3rd/4th than I do in 5th/6th. Car holds 1.2 in higher gears then backs down to 3/4 ish. In the lower gears it only boots and holds 3/4 any ideas?

Could it be maf/map needs cleaning?

Car has map, full turbo back Milltek exhaust (decat) airtec gen 3 and BMC induction.

Thanks

Nathan
 

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You will probably find that it only holds mac boost between certain revs.
In 5th and 6th, the car will stay in this rev range for longer during acceleration, and so it appears to hold boost longer.
Just an idea. Might not actually be a problem.

However, if you're confident that it's only just started occuring, I'd check:

For boost leaks
Boost solenoid replacement
 
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