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VW is38 turbo in a redblock?

J

Jan F

New member
Joined
Jun 11, 2024
I'm looking at what turbo to use in my project, I want something capable to 400 hp but with a quick spool, i was looking some holset but i find them very laggy,
then one of my frends got a mk8 gti clubsport that has the same engine as a golf r and saw a quite large turbo, the prices are arround 500-600€ for one in godd state, these turbos are capable of 400hp in stock form in a ea888 2.0tsi so I think that will be enough for my 2.5 to reach 400hp.
Any opinions? Has someone done something likr this?
 
External wastegate is not going to take you anywhere with variable nozzle turbo. Read up on that. Probably why no one is bothering to answer you.

I mean, you *could* block vanes in fully opel position and use external wastegate to control pressure, but apart from winning "unique mod of the show" and "least efficient turbocharging of the year" awards I don't see other plus sides to the idea.
 
Is38 is not variable geometry. It has a wastegate flapper. It's just actuated by a motor instead of a pneumatic can. You could totally just put a mechanical wastegate can on it as well as a mechanical CBV
 
244tiCanuck said:
Is38 is not variable geometry. It has a wastegate flapper. It's just actuated by a motor instead of a pneumatic can. You could totally just put a mechanical wastegate can on it as well as a mechanical CBV
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Thats why i choose this turbo idk what hes talking abt, turbosmart sells universal bov actuators or I could program an arduino or something to use the stock actuators or when i get a standalone.
 
One other thing to consider is that these DI engines are more knock resistant and sometimes run really small turbines for quick spool and high boost pressures to make the power they do, which might be restrictive and more knock prone on an old school big bore engine like a redblock.
Maybe it's not an issue if the compressor can hit the air mass flow at a lower pressure ratio on a bigger engine. The wastegates also have good priority and flow a lot, so the turbine restriction might not be as big of a deal. Whiteblock guys make power with TD04HLs, which also have a small turbine.
 
244tiCanuck said:
One other thing to consider is that these DI engines are more knock resistant and sometimes run really small turbines for quick spool and high boost pressures to make the power they do, which might be restrictive and more knock prone on an old school big bore engine like a redblock.
Maybe it's not an issue if the compressor can hit the air mass flow at a lower pressure ratio on a bigger engine. The wastegates also have good priority and flow a lot, so the turbine restriction might not be as big of a deal. Whiteblock guys make power with TD04HLs, which also have a small turbine.
Click to expand...
I have thoght of that, i was planing e85 and a dtandalone, there will be less risc of knock but idk, forged rod and piston are going in so it should hold
 
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