Visited the guy who is going to make the turbo exhaust manifold for me. We spoke about an hour for various things and in the end I narrowed my turbo selection into BorgWarner EFR 6255/6258 and Holset HX30W.
Both turbos are very durable but there are some differences.
HX30W would be nearly optimum for what I’m looking for. Relatively cheap, modern and small A/R, somewhere around 0.4. In general the turbo would make boost from small rpms, but still should make enough power for my application. Physical size (somewhat big) and the fact that it is made for diesel engine are turning me to BorgWarner.
6255/6258 (still havent decided which one should have) is bit expensive. Power estimates are similar with the Holset but the turbo itself is full of high tech thingies. Ceramic bearings, space age alloy turbines and whatnot. The turbo, what I’ve found from the internet, is physically bit smaller than Holset, but with way bigger turbine blades. With all the space age bits (lightweight and smaller inertia) the turbo should still be comparable with Holset.
Other parts the guy is going to build for me are complete 3″ exhaust with small muffler and some piping for the intake. Gotta watch my budget. 🙁
Some specs fo the turbos: (will add in the rest of the specs later)
| Holset HX30W | BW EFR 6255 | |
| Compressor inducer | 44mm | 49,6mm |
| Compressor exducer | 71mm | 61,4mm |
| Compressor trim | ? | ? |
| Compressor A/R | ? | ? |
| Turbo inducer | 56mm | 55mm |
| Turbo exducer | 49mm | ? |
| Turbo trim | ? | ? |
| Turbo A/R | 0,41 | 0,63 |
| Flange | T3 | T25 |
Last time I drove the car was nine months ago
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