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07-08-2010, 11:26 PM | #26 |
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I'm convinced too. If I ever go hybrid it'll be this cnc, slight ported heads, sti shortblock and sti cams.
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07-08-2010, 11:49 PM | #27 |
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you gonna use avcs?^^^if your gonna use 2.0 heads you won't want sti cams without avcs. i decided against avcs with my bugeye due to having to change ecu and wire harness...you can get great cams for a 2.0 head reguardless. using sti cams without avcs will leave your timing retarded.
correct me if i'm wrong gentlemen. |
07-09-2010, 01:30 AM | #28 | |
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Perhaps Ed can overlay an appropriate vf48 STi chart on the CNC / non-CNC chart so we can see where the AVCS benefits, I think it's primarily in the pretty low end. |
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07-09-2010, 02:33 AM | #29 |
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That would be my thought exactly as thats whats helping VE and imho, the full physical reason this mod is more knock resistant and the resulting more possible ignition advance ultimately gives the better torque.
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07-09-2010, 08:09 AM | #30 |
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i heard, but it is hearsay but if you use a avcs cam in a non avcs motor the best timing advance you can achieve is -4 degrees? or maybe it was you start out -4 degrees.
if running a plugged sti avcs cam in a 2.0 head is identical to running a wrx cam i wonder why so many people told me it was like starting behind the gun. why run a plugged cam if its identical to a wrx cam? |
07-09-2010, 10:18 AM | #31 |
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And with big turbo builds come big cams most of the time which lower your dynamic CR a good bit too. My past hybrid had 2.0L C.C. shape but was still pretty happy on 91. My C.C.s were also ceramic coated also.
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07-09-2010, 12:21 PM | #32 |
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What is the compression ratio on each engine? What is the AFR? I'm assuming this is on 91 octane, right? Even then, I find the timing on the thicker head gasket car lower than usual for similarly modded cars - were you knock limited? EJ257s with small turbos typically can run more timing than ej205s, your timing numbers are even lower than most ej205 tunes, even on 91 octane. Just trying to understand.
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07-09-2010, 02:07 PM | #33 |
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I was about to ask the CRs on the engines. You should post cylinder compression figures.
1st off, the mentality behind the cylinder head modification is correct, it will be a better setup than using a thicker headgasket. Thats no brainer. There is also the option to get a set of CP pistons that are designed for the hybrid setups. They have been around for a while now, there is just a bit of a wait time as they are special order pistons. Maybe you should have included that setup in the test. There is too many variables on your test. Your assumptions are not ignorable. You should have done this on the same motor. Even if you pick 2 stock WRXs from the same lot, there are going to be differences. Sorry but, this test is not done professionally, you did not eliminate variables. COMPARING TWO DIFFERENT MOTORS IS USELESS. please take this as a contructive feedback for your upcoming tests. good luck. |
07-09-2010, 02:11 PM | #34 | |
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Please go away. Pretty please. |
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07-09-2010, 02:53 PM | #35 |
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lol, where is the pic of the dude with the giant bag of popcorn??
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07-09-2010, 02:56 PM | #36 | |
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07-09-2010, 03:39 PM | #37 | |
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This was not a test. Someone asked Ed in his for sale thread for this machining service if he had plots of a thicker head gasket vs the CNC. Ed simply posted the plot in that thread.....and then started this thread because the data is interesting. Ed did not set out to do a test.....he simply looked through setups he had tuned and put the plots on the same graph. i dont mean to speak for ed and he will correct me if im wrong, but the conversation is in the other thread. the thread is here if you care to read it http://forums.nasioc.com/forums/show....php?t=2011458 You're coming in here like a whiny butthurt baby because EVERYONE (not just ed) is telling you your testing is pretty useless......so you come in here just to put Ed down. You should get off nasioc because you're not garnering yourself any business being on here. Take the time you'd be on here and figure out why every setup on your dyno spools like a gt40. |
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07-09-2010, 07:43 PM | #38 |
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i'm gonna get my v5 207 head chambers done, use the cosworth .78 gasket and e85...
what can we estimate my compression ratio to be and how to you go about figuring it? please excuse my ignorance if its been mentioned in this thread... |
07-09-2010, 10:46 PM | #39 |
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Ed - do you have a similarly modified vf43 STI you can overlay with these other results?
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07-12-2010, 12:35 PM | #40 | |
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07-12-2010, 06:07 PM | #41 | ||
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What about this 'proof' proves that the modified combustion chamber is helping and the gains aren't due to a much better quench height? Sorry, that was a rhetorical question... |
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07-12-2010, 07:33 PM | #42 |
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is there a better way to lower the quench height and keep the compression ratio stock?
i mean the tighter quench with single gasket doesnt work so well with the increased compression ratio..... so isnt it ultimately the CC maching that allows the tighter quench with the single head gasket to work? |
07-12-2010, 10:12 PM | #43 |
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If the compression ratio is too high for your fuel (91 octane) and you want to lower it while maintaining stock quench height, just get a custom set of pistons that do just that. I theorize it will net the results you want.
same quench + higher compression = worse on lower octane fuel (stock hybrid) same compression + worse quench = worse on lower octane fuel (hybrid with thicker headgasket) same compression + same quench = win? on lower octane fuel (custom pistons...) The problem I have with the OP is that he is neglecting to acknowledge the fact that he's changing more than one variable while claiming that 'his' variable change is what helped. That is simply not backed up. If people can't see this logic... then it's just about right for NASIOC. crashtke and Phil from Element Tuning have said that stock headgaskets + stock heads are just fine. Sure, they're talking about 93 octane and the OP is saying that on 91 octane things get worse. Well, no duh! Higher compression + lower octane generally nets a lower peak power output... Is this crystal clear for only me? Say it ain't so. |
07-12-2010, 10:28 PM | #44 | |
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I personally believe its more knock resistant because of the decreased compression ratio and the smoother edge of the combustion chamber. -- Ed |
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07-12-2010, 10:44 PM | #45 | |
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The timing on the thicker head gasket car was knock/consistency limited. I could actually run quite a bit more advance through the mid range for one or two pulls, but once you started getting the car hot, it wouldn't hold the timing at all. I ended up pulling out a lot of timing out in the mid range until it was consistent and knock free under heavy use. Consequently, I ended up leaning it out in the mid range as well to make up some of the torque and smooth it out with the decreased advance. The knock threshold wasn't nearly as sensitive to a/f as timing in the mid range, so I ended up running it at around 11.5-11.2 until about 4000RPM and tapering down to 10.7-10.8 by redline. With this strategy, we ended up with about the same torque levels as we did running richer and more advance, but the tune was much more consistent and stable under heavy use. The a/f on the CNC head car was 10.6-10.7 through the powerband. Thanks -- Ed Last edited by Equilibrium Tuning; 07-12-2010 at 10:50 PM. |
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07-12-2010, 10:48 PM | #46 | |
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-- Ed |
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07-12-2010, 11:01 PM | #47 | |
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There's no reason to theorize on this as I have built and tuned cars with custom pistons as well to bring the CR down and the results were still not as good. If a set of custom pistons solved the issue, I sure as hell would not have gone through the trouble of making this service available. We're not a machine shop, so we don't make much money on this actual service when its said and done. I offer this up to the community because it is the best option I have found after exhausting all other available options. For what its worth, here is an 04 WRX hybrid with custom pistons that brought the CR down to about 8.3:1. This car is running a VF34 and similar supporting mods to the previous two: This particular car tuned out a bit better than a thicker head gasket car, but still suffered from the same lack of consistency when it came to ignition advance especially in the mid range. You could get away with some decent advance for one or two glory pulls, but under real use, it would knock and retard timing. This car ended up at 8* in the mid range up to 23* by redline and was running about 10.6:1. Granted these are all different cars, but the trend is quite clear. Now try to keep an open mind and be a little more respectful of people who do actual R&D rather than just theorizing. It may come as a big surprise to you, but there are people as smart or even smarter than you out there who have already thought of the points you're bring up . Thanks -- Ed Last edited by Equilibrium Tuning; 07-12-2010 at 11:11 PM. |
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07-13-2010, 12:15 PM | #48 | |
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This made me laugh. I guess there some out there who will actually believe that you are doing this primarily to 'help the community'. 'We aren't doing this for the money'. Last edited by MRF582; 07-13-2010 at 12:23 PM. |
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07-13-2010, 01:00 PM | #49 |
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i dont get why you are so against this....or how your logic doesnt see that the CC machining is the reason for the better quench height. Doesnt modus ponens apply here?
So even if the power isnt coming directly and solely from the CC machining.......its coming from using the CC machining to be able to use the proper head gasket and CR. im just lost as to what your problem with this is? Does Ed need to put a * at the bottom of the first post * similar quench height may be achieved by using custom pistons Do we also need to put * at the bottom of every dyno plot? * similar power could have been made with a gt30, gt52, dom3, hta green, etc etc Last edited by Phatron; 07-13-2010 at 01:14 PM. |
07-13-2010, 01:04 PM | #50 | |
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Of course he is in the business to making money, but he only charges $400 for the CC machining. That is quite reasonable seeing as he doesn't own the CNC machine and had to make the program for it, or pay someone else to do so. I had my heads done by hand and that was $300. I would have readily paid $400 for the consistency of a CNC'd job. |
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