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KKK K3T Hybrid Turbo
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CÚdric  



Joined: 27 Aug 2004
Posts: 1609
Location: Sweden

PostPosted: Sat Jan 28, 2017 7:16 am    Post subject: Reply with quote

Holset also uses same trim defenition as garrett, I have access to hundreds of holset maps if you want med to find something And a 931 simulation model as you already seen.


Looking at trim and diamteters is not enough, two similar sized wheels with similar trims can have vastly different flow characteristics, which you only will get by looking at maps. It all depends on how you design the wheel. A HD diesel engine have very different needs to a passcar petrol engine. Its all about trading efficency at high pressure ratios vs having a wide efficiency island, in general.

In general when you go down in trim size you rotate the map to the left, so better for high pressure ratios and lower flows. The 3257 is from a low reving diesel engine, and thus its matched for that But could still be enough for our puny engines.

When you run a restrictor you will be limited in flow when the restrictor chokes, so to get more air into the engine you will have to increase density by applying shit loads of pressure instead, the highly tuned restrictor engines have very specific compressors with maps that are really narrow and really tall.
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 1430
Location: Not Detriot - NMI

PostPosted: Mon Jan 30, 2017 2:11 am    Post subject: Reply with quote

CÚdric wrote:
Holset also uses same trim defenition as garrett, I have access to hundreds of holset maps if you want med to find something And a 931 simulation model as you already seen.


I'm not real interested in holset compressors, unless it comes right down to machining a kkk compressor housing to run a holset wheel, if it would be worth it.. Maybe that's the way to go..

Something that would cover the 1-2 bar range, and go on a 931 turbocharger to keep everything 931 but the compressor..
Is it realistic to find anything that would make 1bar @ 3500RPM but yet be able to make 2 bar if needed?

This is just for future theoretical purposes, because I can't help myself but think about turbos when I should be thinking about wires..

What do you think about that 3072 map?
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1980 931S LSD FMIC hobby - 01 RS25 coupe - 95 M3 coupe - 06 X5
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gegge  



Joined: 27 Jul 2007
Posts: 1006
Location: Sweden

PostPosted: Mon Jan 30, 2017 5:15 am    Post subject: Reply with quote

People are using the HX35 with great success. Would be interesting to compare the compressor to a K27. Just to get an idea of different maps. CÚdric, do you have BW256 as well?
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