grambles423
Automotive Engineer
Good deal Alex. Thanks!
6
Technical Understanding of the IHI (Why does my Power FALL off?)
- Thread starter grambles423
- Start date
Volkswagging
Don't Hate, Inseminate
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.
grambles423
Automotive Engineer
The point of the thread was to explain why. Assumptions that are not backed by proven theory and physics is ignorant.
If ANYONE is a car enthusiast, its best to know why your car acts the way it does.
Plus, this thread also included K04 comparisons :thumbsup:
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.
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.
grambles423
Automotive Engineer
Will do. I'm just going to need Boost graphs and MAF graphs for every company
:thumbsup:
Arin@APR
GOLFMK7 Official Sponsor
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.
Here's a little something you should consider. This is taken directly from Garrett's site:
TurbobyGarrett said:
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.
grambles423
Automotive Engineer
True but in the most general vague sense, you can. When you start considering engine performance vs. compressor performance, you've got many many many other factors to consider, which I know you know that, but for the rest of the readers.....
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.
Good stuff though.
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MKVelocity
Ready to race!
K04 FTW 
Arin@APR
GOLFMK7 Official Sponsor
Yeah, I'm speaking about the turbine A/R. For example, the GT2860RS has a .64 A/R or an optional .86 A/R.
grambles423
Automotive Engineer
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/Warranty Engineering openings at APR?
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Arin@APR
GOLFMK7 Official Sponsor
I may need to look a little harder but on Garretts website they only have the compressor map with no mention of the turbine side. I may need to study it a little more but I'm also confused how compressor maps could be anything more than an estimate. Also, no ambient conditions are on the map (they are on one of the k04 maps I have).
In all areas of APR we are always looking for new tallent. Our engineering staff has expanded rapidly over the past few years so yes, I'd love to see your resume.
wutsupdoc1
Ready to race!
All those graphs remind me of when I used to get high and go to math class in 10th grade lol.
Here is an APR K04 boost plot and you already have one for their K03 software.
Does anyone have GIAC numbers?
You should be able to estimate airflow based on boost, right?
