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Metro Turbo Exhaust Manifold Mods


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#1 Project_1275_GT

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Posted 18 January 2021 - 11:08 AM

Hi 

 

Cant seem to find much info on this area. I took a look at gasket outline on my head and will be opening the port to gasket dimension exhaust only. When i put the gasket against the exhaust manifold its also a terrible alignment to the ports. Has anyone modified this area to be smoother / better flowing? The biggest question is has anyone looked at the exit end of this manifold and the alignment to T3 inlet? This also looks poorly matched and has a mass restriction due to the cast form. Anyone tried to remove the centre area for better flow?  

 

The picture shows the sections in the centre that I am considering grinding out. May affect strength / distortion but who knows until its tried. Surely the flow would be improved?

 

Attached File  s-l1600.jpg   281.99K   3 downloads

 

 



#2 hazpalmer14

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Posted 18 January 2021 - 08:36 PM

Have a look on turbo minis forum I'm sure people IIRC have opened them up a bit and you can port the down pipe elbow as well.

#3 Project_1275_GT

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Posted 18 January 2021 - 08:49 PM

Have a look on turbo minis forum I'm sure people IIRC have opened them up a bit and you can port the down pipe elbow as well.

 

Thanks, Have taken a look on TM and cant seem to find anything. I will try again. Just seems logical for good flow. But logic and Turbos don't always seem to mix well. 



#4 Turbo Phil

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Posted 20 January 2021 - 09:37 PM

Opening the entrance to the runners to reduce the mismatch from head to manifold is a good move. Don’t remove the dividers at the turbine end though. You want the exhaust pulses to remain separated, you can give it a good tidy up though.

Phil.

#5 Project_1275_GT

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Posted 21 January 2021 - 09:37 AM

Opening the entrance to the runners to reduce the mismatch from head to manifold is a good move. Don’t remove the dividers at the turbine end though. You want the exhaust pulses to remain separated, you can give it a good tidy up though.

Phil.

 

Thanks Phil. I have been researching this for a few days now and what you say is 100% correct. Removing or reducing the centre sections will cause more turbulence. This will not help the turbo.. Light polish and clean to get alignment better. 






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