Attention: TDR Forum Junkies 
Just installed Piers HX-50 hybrid"NEW" turbo and the following , is my observations and testing so far:
1. The turbo is a HX-50 , with extreme heavy duty bearings and zero balanced. The exhaust housing is a 15. 8 cm , "schwitzer" made by Borgwarner machined to fit the back of the HX-50, and has the same exhaust flange as a HX-40 and will couple with the HX-40 down pipe. ( the exception to this is a six-speed HO, which a two inch sleeve will be needed to extend the down pipe behind the flange, in order for it to clear the frame and transmission. ) The pin wheel and shaft are much larger than the HX-40, and can easily handle the 50-55 psi of boost. The turbo is not wastegated.
2. Turbo lag... The best way to describe this is, if you can now spool-up a HX-40, you should have no problem in running this turbo.
In normal driving, you will not notice any difference over an HX-40. However, after saying this, there is a slight lag around the 18-2000 RPM range when you try to nail it while cruising down the road, or trying to accelerate on an incline, say in 6th gear. Once you hit 21-2200 RPM the turbo spools real "hard" like a B-1, or H2e, and red lines fast! Oo. The bottom end is like the HX-40 and the top end is like the bigger turbos. Only a slight loss , and I mean "slight" loss of mid-range as compared to the HX-40. Most people won't notice the difference, and at lower elevations, may not even be there?( I forgot to tell you I'm testing at 5700') .
3. Egt's... There is an increase of Egt's, approx. 75-100*. When you accellerate the Egt's climb fast, however, I have not pushed truck hard enough yet to determine if Egt's stabilize within safe limits at WOT.
In summary this turbo, is for those seeking better performance out of a single turbo, to be used for competition, and everyday driver with "road rage".
I would not recommend this turbo for heavy towing , because of the Egt issues. In addition, I would insure, your truck is properly sized in injectors, fueling box, exhaust system etc. before stepping up to this turbo. IMHO, this turbo will out perform the B-1 bomber, and H2e. You will not be disappointed. I understand, a 17cm exhaust housing & blow-off/wastegate system is in the works which may eliminate some issues.
I would also recommend, upgrading your inter-cooler hoses and clamps, which Piers has put together, a package to insure no problems with the increased boost pressures you will be running with this turbo.
Steve
1. The turbo is a HX-50 , with extreme heavy duty bearings and zero balanced. The exhaust housing is a 15. 8 cm , "schwitzer" made by Borgwarner machined to fit the back of the HX-50, and has the same exhaust flange as a HX-40 and will couple with the HX-40 down pipe. ( the exception to this is a six-speed HO, which a two inch sleeve will be needed to extend the down pipe behind the flange, in order for it to clear the frame and transmission. ) The pin wheel and shaft are much larger than the HX-40, and can easily handle the 50-55 psi of boost. The turbo is not wastegated.
2. Turbo lag... The best way to describe this is, if you can now spool-up a HX-40, you should have no problem in running this turbo.
In normal driving, you will not notice any difference over an HX-40. However, after saying this, there is a slight lag around the 18-2000 RPM range when you try to nail it while cruising down the road, or trying to accelerate on an incline, say in 6th gear. Once you hit 21-2200 RPM the turbo spools real "hard" like a B-1, or H2e, and red lines fast! Oo. The bottom end is like the HX-40 and the top end is like the bigger turbos. Only a slight loss , and I mean "slight" loss of mid-range as compared to the HX-40. Most people won't notice the difference, and at lower elevations, may not even be there?( I forgot to tell you I'm testing at 5700') . 3. Egt's... There is an increase of Egt's, approx. 75-100*. When you accellerate the Egt's climb fast, however, I have not pushed truck hard enough yet to determine if Egt's stabilize within safe limits at WOT.
In summary this turbo, is for those seeking better performance out of a single turbo, to be used for competition, and everyday driver with "road rage".
I would not recommend this turbo for heavy towing , because of the Egt issues. In addition, I would insure, your truck is properly sized in injectors, fueling box, exhaust system etc. before stepping up to this turbo. IMHO, this turbo will out perform the B-1 bomber, and H2e. You will not be disappointed. I understand, a 17cm exhaust housing & blow-off/wastegate system is in the works which may eliminate some issues. I would also recommend, upgrading your inter-cooler hoses and clamps, which Piers has put together, a package to insure no problems with the increased boost pressures you will be running with this turbo.
Steve
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