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Old 02-22-2009, 09:48 PM   #29
sponaugle
Scooby Specialist
 
Member#: 4498
Join Date: Feb 2001
Chapter/Region: NWIC
Location: Portland, Oregon
Vehicle:
WRX H6-3.0 Turbo
www.surgelinetuning.com

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Quote:
Originally Posted by NSFW View Post
Thanks for an interesting post.

Do you have dyno charts from this car that show a good (apples-to-apples) comparison of the .63 and .82 housings?
Here is a graph of this same car with the .82 in the spring of 08. Boost was not the same (less in the .82), so ignore the absolute values.

However the difference in boosts threshold is pretty evident.

300 lb-ft is crossed at 3445rpm with the .63, and 3790rpm with the .82. (Difference of 345rpm)
350 lb-ft is crossed at 3700rpm with the .63, and 4000rpm with the .82. (Difference of 300rpm)



Quote:
Originally Posted by garagedefeat View Post
here here! I've stockpiled data posted on this site by Jeff, and used that and some basic math--in lieu of testing anything real-world--to come up with my power adder setup. it's amazing what you can learn with concise data/graphs and explanations from someone in-the-know.
thanks, and nice job with the 08.
ps - what I really dig is how the dyno plots are always scaled the same. I've actually photoshopped a bunch of them together and overlayed them for a little real-world support for compressor map data
Quote:
Originally Posted by Kastley85891 View Post
Great info with 'real' data as usual , very interesting an informative, thx
Thanks guys. There really isn't anything that secret in tuning, so I too wonder why other tuners don't post much. For many it might just be an issue of not having enough time. I have gotten pretty efficient, so it took me a bit less then 30 mins to build these graphs and write up some text to post up.

Quote:
Originally Posted by oversteer View Post
This looks to be a great pump gas combo. Nice tune What numbers would a Pro-tuned Stage 2 STI put down on the same fuel and dyno as your 391 lb-ft, 378whp @ 22psi? I would love to see any overlaid dyno graph to compare the curves.
Everything else being equal how would the results vary if you had a GT3071R .63? Can you take advantage of the larger GT3076R on 92 octane?
How much messing around was it to put the Perrin GD rotated kit on your GR?
Engine bay pics?
I'll find a good one to compare and post back. Stage 2s are usually in the 280 range, with a few really good ones in the 300ish range. Actually I can dig up my own stage 2 graphs from this car.

As for the 71 vs 76, I have not had much experience with the 71. At 22 psi, I suspect the 76 will be a bit more efficient, which is good for pump fuel. If anything the larger compressor is a benifit on pump more then race fuel.

This GR kit was the first one Jeff Perrin made, as we did it for the Subiesport article in April of 08. I think they have the GR kits out now... hmm let me give JeffP a ring..


Jeff Sponaugle
Surgeline Tuning
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Last edited by sponaugle; 02-24-2009 at 12:01 AM.
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