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May 20, 2008, 04:08 PM
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#256
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Quote:
Originally Posted by Colt4g63
Are we going to see JUN 272s?
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i do not think so. i WISH. so bad
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May 20, 2008, 07:20 PM
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#257
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seems the Tomei Crane and S3 perform very close. If anyone wants an overlay of any of the cams i can post it.
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May 20, 2008, 10:22 PM
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#258
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If no graph of the JUN 272s can we get some kind of idea on how they perform?? As in comparable to S2s, S3s, Tomei 280s??   I know they do very well from what I have been told.. and i know my car is VERY strong with them and making great #s even on stock ECU. But a graph would be OH so nice. 
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May 20, 2008, 11:20 PM
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#259
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Quote:
Originally Posted by JC evo1
If anyone wants an overlay of any of the cams i can post it.
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Yeah! How about the HKS 272, FP4R, and GSC S2.
Quote:
Originally Posted by Martin@AMS
You have to be carefull with a stock turbo, too big of an exhaust cam with an early opening event will bleed off too much pressure on the combustion stroke.
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Now THAT is interesting.
Gary
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May 21, 2008, 12:07 AM
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#260
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FP4R isnt posted on the first page yet.
but here is S2 vs HKS 272
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May 21, 2008, 06:29 AM
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#261
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Martin,
When the turbo is happy these tests are showing that choice in cam specs can make an absolutely huge difference, up to 100hp in some cases.
From your experience, will we see the same results when a turbo is pushed to it's absolute limit? For instance, you're running the boost controller wide open and it just won't make any more than XX psi up top. Can changing cams have much of an effect, or will the turbo itself still be the limiting factor?
Thanks for this test!
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May 21, 2008, 07:20 AM
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#262
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Quote:
Originally Posted by Colt4g63
If no graph of the JUN 272s can we get some kind of idea on how they perform?? As in comparable to S2s, S3s, Tomei 280s??
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The JUNs have the duration and ramp profile, but are a little down on lift as compared to the GSCs, Tomeis, and Cranes. The JUNs appear to be deliberately designed around the flow limitations of a stock head, and therefore are ideally suited for large turbo/stock head setups, although they would work well in any large turbo situation.
In short, a strong head with a milder cam works well. A large cam with a mild head is where one tends to run into issues.
Quote:
Originally Posted by EVOlutionary
When the turbo is happy these tests are showing that choice in cam specs can make an absolutely huge difference, up to 100hp in some cases.
From your experience, will we see the same results when a turbo is pushed to it's absolute limit? For instance, you're running the boost controller wide open and it just won't make any more than XX psi up top. Can changing cams have much of an effect, or will the turbo itself still be the limiting factor?
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What the cams are doing is improving the mechanical VE of the engine in the rpm ranges where you are seeing the big improvements. As the boost pressure is increased in those ranges, the power gap will continue to widen until the cams making the most power hit the limits of turbo efficiency.
If the turbo does not have enough reserve efficiency in those ranges to expose the limits of the smaller cams (much less the larger ones), the larger cams will be of limited benefit, especially when the tradeoff in spool characteristics are considered.
What the larger cams do is enable one to make more power, using less boost pressure. This becomes increasingly important as larger turbos with much high rpm reserve efficiency are considered.
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Last edited by Ted B; May 21, 2008 at 07:22 AM.
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May 21, 2008, 02:13 PM
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#263
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very useful post.
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May 21, 2008, 02:21 PM
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#264
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Quote:
Originally Posted by Ted B
The JUNs have the duration and ramp profile, but are a little down on lift as compared to the GSCs, Tomeis, and Cranes. The JUNs appear to be deliberately designed around the flow limitations of a stock head, and therefore are ideally suited for large turbo/stock head setups, although they would work well in any large turbo situation.
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I was having this conversation on sunday with Martin and he was saying the same thing, but I too would like to see how the JUN cams will work with the race head. I do also agree with the rest of your post as I am in a pickle when it comes to cam choice b/c everything changes as soon as I think about just doing a full race head instead of sticking with the stocker.
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May 21, 2008, 02:22 PM
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#265
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Cool I now know real results on most of the cams out there and my car will have a similar setup. Thanks AMS 
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May 21, 2008, 08:53 PM
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#266
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This is what is supposed to be in Part 3, don't think the mag is on the stands yet:
Gary
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May 21, 2008, 09:17 PM
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#267
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great INFO
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May 22, 2008, 09:25 AM
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#268
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FP 4R's are up!
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May 22, 2008, 09:50 AM
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#269
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Very nice, I can't wait to see the 5R's!
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May 22, 2008, 09:52 AM
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#270
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AAHHH you skipped the Kelfords... sad face
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ams, bottom, cam, cams, camshaft, combination, end, evo, idle, ix, magazine, modified, power, test, testing  |
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