durability, upgradability, better flow with better spool. The shaft used in the hx40 is relatively small and tends to snap if the turbo is barked. The s300 line uses a larger more durable shaft. There are compressor wheel options available from 57mm to 66m inducers all using the same shaft and cartridge. The wheels are also available with extended tip technology which is a big plus. Turbine wheels options range from 65mm up to 74mm exducer. You can take a 62/65-12 and easily rebuild it to a 66/74-16 and bolt it back in place. They are a newer design, that coupled with the ETT wheels makes for better spool at comparable levels of air flow to holsets.
Garret and turbonetics also have popular options out there in ball bearing or journal bearing varieties.
cheaper No better yes. It all depends on how much fuel you are adding and how much money you want to spend.
With your mods I woud say a 40 woudl be good. Your not going to push its limits.
If you have more money you want to spend then buy a s300 never had one but they say they are a good turbo.
Its too big. It will run hot on the highway, tow terrible, may smoke heavily during regular driving and if you are able to get it to spool it won't be until late in the rpm range and you won't get much usable power out of it. You may be able to get away with a 64 with a 68,71,or74 turbine if you are really good at tuning and use the truck for competition and don't tow. Smaller turbos are also more forgiving IMO.
There's a lot more to a turbo than just the compressor size though.
Plus a k31 has been proven to preform better than a SB anyways.
The k31 is a large turbo with a 71mm compressor inducer. Of the top of my head I can't remember the rest of the specs on it. ATS's Aurora 5000 is a k31 as is Industrial Injection's PS71. This turbo is also a great primary for a small set of towing twins, ATS and II both use it in there towing sets. This turbo meets sled pulling standards for a 2.8" class.
A Silver Bullet is a turbo Industrial Injection sells that gets a lot of hype. Its a decent turbo but not as good as there sales pitch. It features a 66mm comp inducer, 73.4mm turbine exducer, in a possibly ported 14cm housing with a T3 or T4 manifold flange, oh and an externally polished compressor housing since bling makes more horsepower . This turbo can be ordered to meet the 2.6" class rules. For some reason you have to special order it this way because they often come a hair oversize.
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