Some info on the GT28RS from its designer for those interested.
02-29-2004, 11:33 AM
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Some info on the GT28RS from its designer for those interested.
The following is a quote from Jay Cavanaugh, the designer of the disco potato on a Miata.net thread discussing turbo stuff.
"Hi guys, the GT28R and the GT28RS are very different animals. The HKS GT2530 is closer to a GT28RS, sharing the turbine wheel, but not the 0.86 housing, plus a few differences on the compressor stage (b-width, or exducer "height", for one).
Regarding the model names, the confusion primarily sets in when shops arbitrarily rename the turbos, or when people unnecessarily use superfluous nomenclature on the turbos. Technically the GT28RS is a GT2560RLS. But the latter is actually a generic description--that moniker could describe any number of different configurations of ball-bearing watercooled wastegated turbos with GT25 turbines and a 60mm compressor wheel.
With the model names in the turbobygarrett.com catalog pages, we tried to simplify things as much as possible (a formidable undertaking), and also needed something to differentiate the turbos, since functionally there is a big difference. Hence the "S" on the GT28RS. So just call the GT28R a GT28R, and the GT28RS a GT28RS (or a Disco Potato, seriously) and everyone will know what you're talking about.
The NS111 turbine stage and 0.86 A/R of the GT28RS flows quite a bit. More so than even some of the turbines in the much larger, old T4 frame size. So, no, size isn't everything. High flow on the turbine stage means you don't have to wastegate as much flow for a given condition, meaning less backpressure and better VE.
The 0.64 hsg is avail separately. Of course, at lower boost or turbine expansion ratios, the ultimate power difference between the 0.64 and the 0.86 housings will be minimal.
I used the 0.86 turbine hsg. I also used a somewhat lower flowing, higher efficiency prototype compressor stage than the production GT28RS as it more closely matched what I was trying to accomplish on my Miata. The 62 trim compressor on the production GT28RS is among the highest flowing of its type (60mm "T3" size compressors).
The GT28RS has been very well received by those that have used it, to say the least. "
Cheers,
Sameer<ul><li><a href="http://forum.miata.net/ubb/ultimatebb.php?ubb=get_topic;f=1;t=023495">Turbo thread on Miata.net power forum</a></li></ul>
"Hi guys, the GT28R and the GT28RS are very different animals. The HKS GT2530 is closer to a GT28RS, sharing the turbine wheel, but not the 0.86 housing, plus a few differences on the compressor stage (b-width, or exducer "height", for one).
Regarding the model names, the confusion primarily sets in when shops arbitrarily rename the turbos, or when people unnecessarily use superfluous nomenclature on the turbos. Technically the GT28RS is a GT2560RLS. But the latter is actually a generic description--that moniker could describe any number of different configurations of ball-bearing watercooled wastegated turbos with GT25 turbines and a 60mm compressor wheel.
With the model names in the turbobygarrett.com catalog pages, we tried to simplify things as much as possible (a formidable undertaking), and also needed something to differentiate the turbos, since functionally there is a big difference. Hence the "S" on the GT28RS. So just call the GT28R a GT28R, and the GT28RS a GT28RS (or a Disco Potato, seriously) and everyone will know what you're talking about.
The NS111 turbine stage and 0.86 A/R of the GT28RS flows quite a bit. More so than even some of the turbines in the much larger, old T4 frame size. So, no, size isn't everything. High flow on the turbine stage means you don't have to wastegate as much flow for a given condition, meaning less backpressure and better VE.
The 0.64 hsg is avail separately. Of course, at lower boost or turbine expansion ratios, the ultimate power difference between the 0.64 and the 0.86 housings will be minimal.
I used the 0.86 turbine hsg. I also used a somewhat lower flowing, higher efficiency prototype compressor stage than the production GT28RS as it more closely matched what I was trying to accomplish on my Miata. The 62 trim compressor on the production GT28RS is among the highest flowing of its type (60mm "T3" size compressors).
The GT28RS has been very well received by those that have used it, to say the least. "
Cheers,
Sameer<ul><li><a href="http://forum.miata.net/ubb/ultimatebb.php?ubb=get_topic;f=1;t=023495">Turbo thread on Miata.net power forum</a></li></ul>
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