Envy_bron
New Member
Ive come across a single T4 57mm on facebook marketplace and im wondering if its possible to do a sequential system on my 2015 sho. Im not too too deep with the specifics of how to upgrade it, im just curious.
Is it possible to upgrade only one of two twin turbos?
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SM105K
Streetlight Grand Prix Champ/ IG @fafomotorsports
I don't see why you couldn't run a sequential system. However a 57 mm will be enough for a single turbo application. Something to think of. @Jordan_R is all about that single turbo life.
That being said here are some of the issues you will run into if you decide to run sequential.
1. You will probably run into an actual physical space issue. The turbos on our cars are tiny, that 57 mm will most likely be quite a bit larger. There isn't much space in the front due to the radiator. The rear might be your best bet.
2. Joining the 57 mm to the stock manifold. You might have to build a manifold, or modify the stock manifold extensively.
3. Wastegate: Does this 57 mm have an external or internal wastegate? If it is external you will end to adapt a wastegate after the turbo onto the downpipe. If it is internal that could be easier.
4. Downpipe: you will need to modify the downpipe that connects to the 57 mm turbo.
5. Intake: you will need to modify the intake piping to the 57 mm turbo.
6. Cold side piping: you will need to modify the cold side/charge piping from the 57 mm. You will also have to modify the blow off valve as well.
7. Boost control: This goes hand and hand with the wastegates. You will need to figure out how to control the 57 mm WG with the stock boost controller.
8. Oiling and Oil drain: You will need to retro fit a oil supply line to the 57 mm. You will also need to figure out how to get the oil back to the pan. If you keep the 57 mm at the same height, you will be able to use gravity for the turbo oil drain like stock. If you move the turbo down, you will need a scavenge pump.
Is it worth it? Possibly. The gains could be immense. However, fabrication could be pretty intensive and expensive.
Perhaps just replacing the stock turbo with a stock turbo will be the best bet.
If you are looking for performance putting a pair of upgraded GH turbos that are proved to work with no fabrication will ultimately be cheaper.
If you are looking to be different.... @802SHO can show you the way.
Hope this helps.
That being said here are some of the issues you will run into if you decide to run sequential.
1. You will probably run into an actual physical space issue. The turbos on our cars are tiny, that 57 mm will most likely be quite a bit larger. There isn't much space in the front due to the radiator. The rear might be your best bet.
2. Joining the 57 mm to the stock manifold. You might have to build a manifold, or modify the stock manifold extensively.
3. Wastegate: Does this 57 mm have an external or internal wastegate? If it is external you will end to adapt a wastegate after the turbo onto the downpipe. If it is internal that could be easier.
4. Downpipe: you will need to modify the downpipe that connects to the 57 mm turbo.
5. Intake: you will need to modify the intake piping to the 57 mm turbo.
6. Cold side piping: you will need to modify the cold side/charge piping from the 57 mm. You will also have to modify the blow off valve as well.
7. Boost control: This goes hand and hand with the wastegates. You will need to figure out how to control the 57 mm WG with the stock boost controller.
8. Oiling and Oil drain: You will need to retro fit a oil supply line to the 57 mm. You will also need to figure out how to get the oil back to the pan. If you keep the 57 mm at the same height, you will be able to use gravity for the turbo oil drain like stock. If you move the turbo down, you will need a scavenge pump.
Is it worth it? Possibly. The gains could be immense. However, fabrication could be pretty intensive and expensive.
Perhaps just replacing the stock turbo with a stock turbo will be the best bet.
If you are looking for performance putting a pair of upgraded GH turbos that are proved to work with no fabrication will ultimately be cheaper.
If you are looking to be different.... @802SHO can show you the way.
Hope this helps.
Last edited:
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