IHI VF28 Turbo

One thing I didn’t like about the turbo set up was that I wasn’t being rewarded for revving the engine. There was plenty of mid range torque which is always useful for exiting a corner at a lazy rpm, but from a pure driving perspective I’d rather the performance lived a bit further up the rev range. So I bought a bigger turbo…

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VF28 with 32mm restrictor vs TD04L-13T

Hopefully not too big!! It’s a VF28 turbo so still from the Impreza range. This should mean it bolts up to the existing manifold and downpipe. It’s a bit bigger than the TD04 but not too much bigger, I don’t think. It’s a ball bearing turbo which should help spool but the exhaust turbine is much bigger so overall it should come along a few rpm later than the TD04. It’s got a 32mm restrictor for rallying fitted which needs removing, which was job one. Apparently once it’s removed it’s just the normal housing underneath.

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The first problem I had was I couldn’t get a hacksaw into the welds, so out came the dremel. This didn’t take long to cut through the two welds and from there the restrictor came straight off.

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Curses! Won’t be getting any silicone hose on that! I ordered a remanufactured housing from Turbo Dynamics for £12 plus the vat so no great expense. By remanufactured, I think they meant painted! The inlet had a bit of pitting in it but I presume that’s not a problem else they wouldn’t have reused it.

Lastly, a photo comparing the two exhaust housings. Notice how much bigger the turbine is on the VF28.

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TD04 (left) vs VF28 (right) exhaust housings

 

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