Would a journal bearing 6766 with a .63 exhaust housing spool faster than a te45a with a .63 exhaust housing? Both running precision housings.
If it is a newer style 67 wheel, then yes it will.
A MFS 67mm wheel will spool better than cast, but a Garrett GTW, WORK G4, or Precision Gen 2 CEA will all spool faster than a MFS 67.
Those 3 wheel types all use high quality billet aluminum wheels that utilize point-milling manufacturing processes to allow for less wheel mass, thinner blades, increased blade angles, lower inertia rates for increased spool up characteristics and part-throttle response.
Basically, if you are talking about a newer 67mm compressor wheel, it will spool faster due to the advancements in technology that the new wheels utilize; specifically those manufacturers I listed use the latest third-order geometry designs in their wheels to provide the highest level of output from their respective turbocharger compressor wheels.
Hard to say for sure in everything but probably yes due to the reduction in mass but the 67 I use has a smaller exducer to widen the useful range of the compressor and will take a little more to get the shaft speeds needed to get the pressure ratios up. I only had one car that I had data from that was a direct switch from the cast wheel p trim 45 to the MFS 6766 and the 67 did spool faster on that application.
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Does the MFS 67mm wheel you are talking about utilize extended-tip blade designs on it? Is that why you are referencing the reduction in mass?
Wouldn't the the smaller nose and reduction in hub size allow the MFS 67 to spool quicker as well, provided the wheel was designed in the first place with those things?
Have you tried other 67mm wheels with higher quality alloys that allow for much more severe exducer angles on the blade, or wheels that utilize ETT and maintain a smaller exducer diameter for lower rotating mass intertia?
You have more knowledge of direct turbo swaps than just about anyone in this Buick community, and I'd love to know what comparisons you have done with these new high end wheel designs. And I mean higher than something KTS would offer.