850 t5 saloon cutting hesitation at 4000 rpm in 3&4

[pamdam]

Just got 850 t5 saloon yesterday and i put an mbc on last night. The car seems to hesitate then jump at around 4000 rpm in 3rdand4th.

Any ideas?

[AndysR]

Most likely that your overboosting..

Remove the MBC ;)

[T5frankie]

or underfueling

[pamdam]

Bang turned boost down and now its fine. Cheers lads.

[jayeastanglia]

pop a boost gauge in the car and see what boost you running helps set the mbc up..

[pamdam]

Already got one first thing i did before the mbc went in.