Originally Posted by
bigchez
but when it does spool there will be even more boost so you may just make it worse. surge is when the engine can't physically consume the air so boost capping might be a work-around but sure the answer is to properly fix it - poss cam timing or more headwork? I'm not an expert fella. who built/mapped it? ask them?
Fitting a larger AR turbine housing will decrease the backpressure (the larger AR flows more gas), making less resistance for the compressor to work against, and therefore the engine can flow more air. Its all about the pressure differential across the compressor and turbine.
CossieRich on here made 460hp on std head, only using a BD14 inlet cam. (480hp with MAD special super secret inlet cam).
Seeing as the BD14 is a "top end" power cam actually makes the lower end loose VE.
I think the solution is anti surge compressor housing combined with the 0.82 turbine housing, and a EBC.
So I will machine my own comp housing to antisurge in the next couple of days while I wait for my 0.82 housing.