Aftermarket clutches sound great but extra drive train shock on this platform is something to consider. With the way the b58 makes tons of low end torque keeping drivetrain happy past 550+ wheel tq will be challenging. Ask the guys replacing the driveline guibos, axles, and rear diffs on the autos.
None here. Downpipe and tuned 2020 on E30 made 471/553 dynojet. Factory unlocked ECU. 20 spools a stock turbine housing slightly quicker. HKS hipermax hybrid kit was designed for the 20 not the 21. Besides a 20 can run a 6 port head if you so desire and then have 11:1 compression.
Everything I've heard from tuners says the engines are identical when tuned. The advantage is thought to be had after 750+whp but it's only theory at this point
Part numbers are different yes but due to manifold changes. The actual turbo wheel sizes have been verified to be the same. The 20 is tuned with more boost taper and less overall boost period. Remember this turbo falls out of efficiency at 22-23 psi so more boost becomes inefficient.
This sits on the side of the intake hose correct. #2 in the picture. It bolts to the side of the block. What is in that part that bolts to the side of the block?
I'm trying to figure out what this hose is or does. It appears to be vacuum only. It is #2 in the diagram and connected from the intake pipe to the side of the block.
BMW has a valve that opens when under boost only to return crankcase pressure back to intake at least on the n55