ball bearing or bushing
Thread Starter
Junior Member
Joined: Mar 2008
Posts: 28
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From: Houston Texas
ball bearing or bushing
what is better ball bearing bushing vgt or wastegated? i know with ball bearing you have lower shaft life but lil better spool up time, were as with bushing longer sol but way long turbo life. and as far as vgt vs waster gat the vgt you can totaly change you boosts settings on the fly, were as with waster you have to turn off motor adjust.
Rotorhead
Joined: Feb 2001
Posts: 9,136
Likes: 39
From: Charlottesville, Virginia, USA
At this time, ball bearing and external wastegate. The high end turbos for an RX-7 are the Garrett GT-R series.
Garrett claims a faster spool, longer durability, and increased bearing load with their ball bearing cartridge vs. their older journal bearing cartridges.
Not exactly. You can change the boost setting of a wastegate on the fly with a wastegate controller, or even have it automatically controlled by an advanced engine management system. The difference is that a wastegate only changes the boost level, while VGT changes both the boost level and the A/R ratio, which is more efficient. However, so far no production VGT turbos have been proven to work well with the RX-7's 13B engine.
Not exactly. You can change the boost setting of a wastegate on the fly with a wastegate controller, or even have it automatically controlled by an advanced engine management system. The difference is that a wastegate only changes the boost level, while VGT changes both the boost level and the A/R ratio, which is more efficient. However, so far no production VGT turbos have been proven to work well with the RX-7's 13B engine.
Thread Starter
Junior Member
Joined: Mar 2008
Posts: 28
Likes: 0
From: Houston Texas
At this time, ball bearing and external wastegate. The high end turbos for an RX-7 are the Garrett GT-R series.
Garrett claims a faster spool, longer durability, and increased bearing load with their ball bearing cartridge vs. their older journal bearing cartridges.
Not exactly. You can change the boost setting of a wastegate on the fly with a wastegate controller, or even have it automatically controlled by an advanced engine management system. The difference is that a wastegate only changes the boost level, while VGT changes both the boost level and the A/R ratio, which is more efficient. However, so far no production VGT turbos have been proven to work well with the RX-7's 13B engine.
Garrett claims a faster spool, longer durability, and increased bearing load with their ball bearing cartridge vs. their older journal bearing cartridges.
Not exactly. You can change the boost setting of a wastegate on the fly with a wastegate controller, or even have it automatically controlled by an advanced engine management system. The difference is that a wastegate only changes the boost level, while VGT changes both the boost level and the A/R ratio, which is more efficient. However, so far no production VGT turbos have been proven to work well with the RX-7's 13B engine.
