grambles423
Automotive Engineer
Good deal Alex. Thanks!
first thing i thought before even opening this thread: it's a small turbo. good idea for a thread but I think most people know that small turbos are gonna drop off.
Awesome thread! There should be more like this in these technical forums. I love learning about this stuff :clap:
Grambles, can you plot some of the various K03 and K04 tunes out there on these compressor maps? I think that would give a lot of insight into the different tuning philosophies and methods.
TurbobyGarrett said:Turbine A/R - Turbine performance is greatly affected by changing the A/R of the housing, as it is used to adjust the flow capacity of the turbine. Using a smaller A/R will increase the exhaust gas velocity into the turbine wheel. This provides increased turbine power at lower engine speeds, resulting in a quicker boost rise. However, a small A/R also causes the flow to enter the wheel more tangentially, which reduces the ultimate flow capacity of the turbine wheel. This will tend to increase exhaust backpressure and hence reduce the engine's ability to "breathe" effectively at high RPM, adversely affecting peak engine power.
You cannot compare two turbocharger simply by looking at compressor maps.
Here's a little something you should consider. This is taken directly from Garrett's site:
Two turbos could have similar compressor wheels or similar compressor maps, however simply changing the turbine can greatly alter the results.
Smaller A/R = quicker boost onset but less efficient and choked out top end.
Larger A/R = slower boost onset but more efficient and more top end.
EDIT: I just breezed over your post, and I thought you were talking about AF ratio. I'm retarded lol AR ratios should be mentioned on the MAP and is considered in the overall performance. If you change the A/R a new map should be produced. If what you said is true about similar turbine trims, then you can easily see the change between the two maps and the difference in the A/R ratio.
Yeah, I'm speaking about the turbine A/R. For example, the GT2860RS has a .64 A/R or an optional .86 A/R.
I know, but I believe they would provide MAPs for both A/R ratios, correct? I havent really checked before. I just kind of assumed they did.
Also, ARIN, ever have any MECH/Quality/Qarranty Engineering openings at APR?
Will do. I'm just going to need Boost graphs and MAF graphs for every company