Chuks
Senior Member
Joined: August 2015
Posts: 498
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Post by Chuks on Sept 4, 2018 17:34:55 GMT -5
Hi all, Found this wheel GTA4202 wheel with 6.27mm tip height. 74.72mm inducer, 102.35 base exducer and 108.44 extended exducer so average of 104mm. Hub diameter is 17.52mm. It's a 7+7 billet wheel.
JOHN said "the area in needs to be roughly twice the area out" So ~ 2.1 : 1 This can fit into the GTX4508R turbine/shaft (87mm inducer and 80mm exducer) Any help on how to find the map? Thanks for your help.
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Post by racket on Sept 4, 2018 19:32:31 GMT -5
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Chuks
Senior Member
Joined: August 2015
Posts: 498
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Post by Chuks on Sept 5, 2018 15:38:10 GMT -5
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Chuks
Senior Member
Joined: August 2015
Posts: 498
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Post by Chuks on Sept 6, 2018 14:03:21 GMT -5
Hi all, Still hunting for a better turbo for the new project. Now am looking at the GTX4088R Compressor wheel. Any ideas of how to find the tip height and hub diameter of this wheel will be appreciated.. Thanks for your help. Don't know about map though...
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Post by jetjeff on Sept 6, 2018 14:51:20 GMT -5
Hi Guys,
Is it possible to use a compressor from say a supercharger off a jet ski?
Regards
Jeff
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Post by racket on Sept 6, 2018 17:45:31 GMT -5
Hi Jeff
What does it look like ??
Is it driven by the engine ??
Cheers John
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Post by racket on Sept 6, 2018 17:49:34 GMT -5
Hi Chuks
It'd be impossible to get the comp flow through that sized turb stage , also the turb stage effic is a pathetic 66% , the engine wouldn't turn out much power
Cheers John
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Chuks
Senior Member
Joined: August 2015
Posts: 498
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Post by Chuks on Sept 7, 2018 0:28:45 GMT -5
Hi John, Thanks for the reply. Turbine stage is the problem then.... This is why am looking for a turbo with a compressor map..
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Post by jetjeff on Sept 7, 2018 2:05:00 GMT -5
Hi John, They are centrifugal units like the Vortech or Procharger units for cars. Just search 'supercharger impeller' on eBay, you'll come up with impellers from watercraft like the SHO Yamaha wheel shown above. Regards Jeff
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Post by racket on Sept 7, 2018 2:33:55 GMT -5
Hi Jeff
OK , had a look , theres lots of them on Ebay ............all shapes and sizes , some look better than others , but can't see why they wouldn't work , might need to be careful about their design limits.
Cheers John
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Post by jetjeff on Sept 7, 2018 3:02:15 GMT -5
Hi John,
Thanks
Hi Chucks,
I guess the downside to using a supercharger impeller is you'd be forced to make a homemade axial turbine. The upside is they come in much bigger sizes than even the largest turbochargers.
Finding a supercharger compressor wheel to work with a commercially cast axial wheel is another possibility.
Regards
Jeff
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Chuks
Senior Member
Joined: August 2015
Posts: 498
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Post by Chuks on Sept 7, 2018 14:35:23 GMT -5
Hi John, Thanks Hi Chucks, I guess the downside to using a supercharger impeller is you'd be forced to make a homemade axial turbine. The upside is they come in much bigger sizes than even the largest turbochargers. Finding a supercharger compressor wheel to work with a commercially cast axial wheel is another possibility. Regards Jeff Hi Jeff, The biggest turbo compressor will produce too much power than needed. A 92mm inducer from the Garrett gtx model will just be enough for me but COSTLY. example is the GTX5533R. Therefore twin engine will be used, so say 62 - 76mm inducer wheel will do. Also am sticking to turbo standard rotors simply because there no where to balance any shaft I made myself talk more of homebuilt axial turbine blades. Turbo parts will be more forgiving looking at my location. Thanks for your help.
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Post by racket on Sept 7, 2018 15:26:56 GMT -5
Hi Chuks
Invariably small turbos have poorer efficiencies than larger ones, this will compromise the engines fuel efficiency( SFC) .
Cost often goes hand in hand with performance , the newer designs and billet wheels will cost more than older cast wheels , the reason we started using the Garrett TV94 comp wheel was cost , its a relatively inexpensive wheel , similarly the F Trim turbine wheel , both are are very common wheels used in quantity , so price comes down.
Ideally I'd like to be able to use the Garrett GT6041 turbine wheel as it has a higher flow capacity , but its a very expensive wheel , so I persevere with the TV94 ones.
Trying to find a suitable high pressure ratio wheel in the size you want won't be easy .
Cheers John
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