LNFwagonSS

Gonna go with a ZFR setup next year. Considering the stock exhaust manifold is twin scroll and the ZFR turbine housing is single scroll, what would pros and/or cons be if you removed a large portion of that divider?

slapbetcommissioner

iTrader: (3)

I imagine even though it's not a twin scroll it can't hurt having the exhaust gasses delivered more smoothly with the pulses devided vs it all crashing together at the collector. Not fact but an opinion haha.

tomj77

iTrader: (2)

It doesnt effect the performance of the zfr, dont waste ur time. Ull probably just end up cracking the casting anyway if u try

ECaulk

iTrader: (6)

Should have little to no effect.

Slowbalt2000

iTrader: (1)

I did it on a stock turbo, definitely spooled slower but i agree with slapbet, the manifold is super short with tight bends, the divider might actually be helpful.

royce777

iTrader: (29)

it would weaken the manifold and lead to other cracking in it.

Slowbalt2000

iTrader: (1)

I ran mine like that for around 8-9 months, it might crack eventually but didnt see any carbon build up on the outside when i removed it.

ECaulk

iTrader: (6)

It's fairly thick walled cast, I don't think it would crack. The crack that occurs in the divider is most likely due to thermal shock cycles, which is why almost everyone sees it.

LNFwagonSS

I don't think it would cause any additional cracking either. I've already done some mild porting in the manifold and structure is the least of my concern. If there are performance disadvantages like spool or anything else, those would be the only reasons I would leave it.

ECaulk

iTrader: (6)

the zfr is already single scroll, so it wont have any advantages or disadvantages on spool time.

LNFwagonSS

In relation to the size of 2 cylinders primaries where the exhaust gas enters vs the size of one side of the outlet, the outlets are smaller comparatively which would be considered restrictive . I can only assume it would be beneficial to remove it but I am no expert in this area.

Slowbalt2000

iTrader: (1)

Really the only way to tell would be CFD or flow bench it. If i had the manifolds and the time i could flow them no problem. Disrupted flow really kills your airflow though.