sbr mannifold on evo 3???

[goonie]

hi guys
have a brand new evo 3 sitting in my garage i was ready to start with the porting
because i am planning to get the sbr cast mannifold
from what i read the sbr mannifold messures 7 cm at the turbine inlet flange(correct?)
now the following the evo 3 turbine inlet messures 6 cm the overall size of the turbine flange is only 8 cm so when porting it to match the sbr mannifold to 7 cm there will be only 5mm on each side for the gasket sure it will blow out
and if i deside not to port the turbo flange its gonna hurt flow because the hole on the sbr is bigger than the evo 3
any suggestions?
thanks in advance

 

[eyebrowski]

It will not be good for performance if you don't port the turbo and leave that lip there. I have been running with out a manifold gasket for a couple years and it has worked fine for me. As long as your turbo/manifold flanges are flat you shouldn't have any leaking problems.

 

[goonie]

It will not be good for performance if you don't port the turbo and leave that lip there. I have been running with out a manifold gasket for a couple years and it has worked fine for me. As long as your turbo/manifold flanges are flat you shouldn't have any leaking problems.

thanks for the reply so flat flanges wont be a problem as both the turbo and mannifold are new but what about cracking , to match the turbo flange to the mannifold there will be only 5 mm material left on two sides of the turbo flange will this be a problem??

 

[eyebrowski]

Lots of people port their 6cm housings, will it be more prone to cracking...probably but I wouldnt worry about it too much. You don't have to take tons of material out of the whole housing either, if you can smooth/remove the lip that should be sufficient.

 

[goonie]

oke thanks but what a bout flow??
by just removing the lip the hole stays 6 cm and the sbr mannifold is 7 cm
this must hurt flow in some way?

 

[eyebrowski]

Well a smaller hole will always restrict flow over a larger hole but you remove the lip that acts as a wall when the exhaust has hits it and makes a lot of turbulence. By removing the lip you can make the flow pattern better. Why not get a bigger exhaust housing?

 

[goonie]

Well a smaller hole will always restrict flow over a larger hole but you remove the lip that acts as a wall when the exhaust has hits it and makes a lot of turbulence. By removing the lip you can make the flow pattern better. Why not get a bigger exhaust housing?

are there bigger exhaust housings availabel for the evo 3?
dont know but if there are let me know where to get one maybe a link
thanks .

 

[eyebrowski]

Give any of the major turbo vendors a call or find a used 7cm housing.

 

[ziggi's92tsi]

go to www.bullseyepower.com they will have what you need