Subject	Not unless you specify otherwise when ordering the pistons,
Posted by	Ash's Z on November 16, 2005 at 1:06 AM
	This message has been viewed 275 times.
In Reply To	isn't stock 8.5:1? posted by Shawn300zTT GT28R MD on November 16, 2005 at 12:54 AM
Message	no, they are 8.5:1 compression ratio. Changing camshafts will affect the effective comrpession of the engine though, since upgraded cams have greater duration, which creates more valve overlap (the period of crank rotation that the exhaust valve is still open as the intake valve is opened). This overlap will cause the measured compression of the cylinder to change, which is called the effective compression. Static compression is the theoretical calculated compression of a cylinder given the volume at BDC vs. TDC. As an example, Dee's measured compression numbers (effective compression) are lower than Rob's due to the fact that Dee has upgraded cams, but Dee and Rob have the same 8.5:1 static compression wiseco pistons (unless they were built with something different, which I am not aware of). [ ashspecz.com ] [ agpowers@bellsouth.net ] Enthusiasts soon understand each other. --W. Irving. Are you an enthusiast? If you are out to describe the truth, leave elegance to the tailor. Albert Einstein
Follow Ups	WOW -=Sport500 vs. Sport600w/extrude hone manifolds=- - Ash's Z 16:00:18 11/15/05 clearly sport 500's are teh heat :) (n/m) - Adam (NoVA) 16:07:31 11/15/05 Not sure what you mean there, but the Sport600's are - Ash's Z 16:09:42 11/15/05 Needs to learn to read ------------------------> (n/m) - Adam (NoVA) 16:12:02 11/15/05 Needs to learn to spell "teh"------------------> - Gold Z 16:27:16 11/15/05 actaully no - Adam (NoVA) 10:44:21 11/16/05 I said it over a year ago .. rant rant rant... - Slowninja(The Devil's Z) 20:52:07 11/15/05 All I have heard people saying is Sport 600 has too - Ricerdaddy 16:15:15 11/15/05 No complaints here - SilverTwin(OH) 18:14:23 11/15/05 I can attest to that... lag wasn't bad at all. (n/m) - PennStateZ 18:54:49 11/15/05 Agreed. They are a little laggy but doesn't bug me >> - Greg (Dallas) 19:35:42 11/15/05 C'mon Ash, your killing me with all this dyno stuff :-) - DAYTONAZ 16:24:40 11/15/05 LOL, its the buzzzzz. - Ash's Z 16:36:32 11/15/05 Looks like apples to oranges to me (n/m) - bankruptedz 16:49:43 11/15/05 i think that's the point (n/m) - PennStateZ 17:44:17 11/15/05 I was impressed with Joel's dyno and spool also. Any more - sfarrah 16:59:23 11/15/05 My sport 600 dyno from the turbo comparison in the FAQ - SilverTwin(OH) 18:20:38 11/15/05 Is that a pump fuel run? do you have the tq curve? - sfarrah 16:45:35 11/16/05 Is that Sp500 dyno representative of all sp500. I find - AzHeat 17:06:53 11/15/05 Stock manis are not that bad if ported properly - Gunter_Prien 17:14:13 11/15/05 Thanks Haken (n/m) - AzHeat 17:18:15 11/15/05 Sorry but this is bad information. Please do a search on - Milo (San Antonio) 18:34:42 11/15/05 Sport 600's dead below 2500 RPM (n/m) - Hawk 17:52:54 11/15/05 That's just where the pulls began... - Ash's Z 17:55:38 11/15/05 And.. what? Who races below 2500 rpms? (n/m) - Kenny 17:57:05 11/15/05 we going to fix my profile one of these days ;) - chris@boostpro.net 19:22:14 11/15/05 Do any of us really care about anything under 2500 RPM! (n/m) - Ricerdaddy 18:00:09 11/15/05 um yes (n/m) - CollegeBoy 19:30:47 11/15/05 then stick with stock turbo or sport 500. (n/m) - Ricerdaddy 22:33:06 11/15/05 Sell the Z and get a diesel (n/m) - BillZ2+2 23:33:34 11/15/05 already have one (n/m) - CollegeBoy 08:55:13 11/16/05 both sp500 charts are very similar to mine. Mine comes into - Ghozt 18:14:23 11/15/05 Here's my Sport600 dyno (also with extrude honed manis) >> - Greg (Dallas) 19:33:58 11/15/05 and i always thought those turbos were really laggy (n/m) - CollegeBoy 19:36:24 11/15/05 impressive spool for its size - Max865(ATL) 20:21:25 11/15/05 Not sure. Probably just differences in when they - Greg (Dallas) 21:05:59 11/15/05 Ash, U think the BC is dialed in properly?? (n/m) - racer2fst 19:36:35 11/15/05 Yes, it isn't your BC - your boost response is typical for - Ash's Z 20:00:23 11/15/05 Hey Rob! (n/m) - Joe(NoVA) 20:12:28 11/15/05 Hey Joe, how u been? How's the car? (n/m) - racer2fst 21:26:55 11/15/05 Thanks Ash I knew I was not going crazy when I looked at - Agner.S 19:36:48 11/15/05 Here is my sport 600 dyno prior to my gt28rs turbo upgrade - Slowninja(The Devil's Z) 19:56:38 11/15/05 How much boost on those runs? (n/m) - Greg (Dallas) 20:12:31 11/15/05 why did ur lag so much more than Ash's dyno's? - Rickytl (MA) 20:35:30 11/15/05 Dee's is more normal for a sport 600 car - Joe(NoVA) 22:22:25 11/15/05 Hey Ash, could you overlay joels and my dynocharts - Joe(NoVA) 20:07:42 11/15/05 Or maybe all three? rob's, joel's and mine :-) (n/m) - Joe(NoVA) 20:13:10 11/15/05 Here is Dee, Joel, Rob, and Joe's cars >>>>> - Ash's Z 20:29:59 11/15/05 Nice job, Ash. - SactoTodd 20:53:36 11/15/05 Wow, thats pretty crazy, turbos inside - Joe(NoVA) 21:09:57 11/15/05 I begin to like those sp600's with ported manifolds - Max865(ATL) 21:37:28 11/15/05 I'm still baffled how Joel's car out spools Dee's car? - sfarrah 17:00:49 11/16/05 If you look at these dyno charts.... - Zluster(Sir Sam) 20:30:45 11/15/05 You go! It would be nice to see you do this on Dee's - Ash's Z 20:36:32 11/15/05 Ok can do... - Zluster(Sir Sam) 20:49:21 11/15/05 hm... someone skilled in C++ could make a program. - PennStateZ 21:20:28 11/15/05 well the only problem is you still have to input the data - Max865(ATL) 21:50:33 11/15/05 Yes exactly. - Zluster(Sir Sam) 22:04:41 11/15/05 yeah, ask for some actual dyno data points, should have them - Max865(ATL) 22:17:29 11/15/05 Re: yeah, ask for some actual dyno data points, should have - Zluster(Sir Sam) 22:55:41 11/15/05 Re: Re: yeah, ask for some actual dyno data points, should h - Zluster(Sir Sam) 22:58:26 11/15/05 sum of all the power produced correct? (n/m) - Max865(ATL) 23:09:03 11/15/05 Re: sum of all the power produced correct? - Zluster(Sir Sam) 23:56:31 11/15/05 laggy supras or dyno queens should still have more - Max865(ATL) 23:08:03 11/15/05 it depends... - Zluster(Sir Sam) 23:43:52 11/15/05 Actually... - PennStateZ 12:33:35 11/16/05 Ti-89 to the rescue :-) (n/m) - Max865(ATL) 21:42:54 11/15/05 Nope, I use a Ti-82, its about 15 years old now. (n/m) - Zluster(Sir Sam) 22:06:00 11/15/05 did the same thing w/ a 6th order polynomial. all the - red TT (STL) 22:32:31 11/15/05 thats a little too rough of an estimate - Max865(ATL) 23:01:19 11/15/05 my sport 500 regression overlaid on the original - red TT (STL) 23:26:03 11/15/05 yup, we'll comapre results once i get some tabled dyno data (n/m) - Max865(ATL) 23:30:02 11/15/05 Ya we need some data tables.... - Zluster(Sir Sam) 23:46:11 11/15/05 tables would be awesome, especially in .25k rpm increments, - red TT (STL) 23:58:56 11/15/05 Re: tables would be awesome, especially in .25k rpm incremen - Zluster(Sir Sam) 00:05:08 11/16/05 i dunno. Ash, how much would you say a dyno typically varies - red TT (STL) 00:08:47 11/16/05 Typically, NONE, if you observe proper cool-down periods - Ash's Z 00:33:32 11/16/05 Wow, that is really close. (n/m) - Ash's Z 23:31:26 11/15/05 yup the greater the number of... - Zluster(Sir Sam) 23:50:36 11/15/05 That can be done, albeit, time consuming. - Ash's Z 23:57:06 11/15/05 ACTUALLY, just found the export utility. :) - Ash's Z 00:00:56 11/16/05 do you have a 250 rpm increment table? (n/m) - red TT (STL) 00:03:19 11/16/05 I did the one below in 50RPM increments. I can do any - Ash's Z 00:12:27 11/16/05 ohhhh sweetness.... - Zluster(Sir Sam) 00:04:16 11/16/05 Try this data: This is run #4 and run #11 1.4bar - Ash's Z 00:08:30 11/16/05 Someone else want to run them? - Zluster(Sir Sam) 00:16:23 11/16/05 run#4 = 1655.25, integrated from 2.25k to 7k rpms. - red TT (STL) 00:29:12 11/16/05 run#11 = 1414.73, integrated from 2.55k to 6.9k rpms - red TT (STL) 00:41:14 11/16/05 Do both of them from, say, 2700RPM to 6900RPM ? (n/m) - Ash's Z 00:45:10 11/16/05 run #4 =1561.63, run #11= 1404.89 from 2.7k to 6.9k - red TT (STL) 01:33:39 11/16/05 Mind telling me what program your using? - Zluster(Sir Sam) 01:37:26 11/16/05 i do the plotting & regressions on excel, integrate on my - red TT (STL) 02:22:56 11/16/05 Man, that's really awesome! - Ash's Z 01:42:38 11/16/05 Dont think so.... - Zluster(Sir Sam) 01:54:51 11/16/05 it doesn't, but it will generate the 6th order polynomial - red TT (STL) 02:26:54 11/16/05 The integrating part is easy.... - Zluster(Sir Sam) 02:38:43 11/16/05 Re: The integrating part is easy.... - red TT (STL) 03:48:55 11/16/05 Ah gotcha... - Zluster(Sir Sam) 11:02:40 11/16/05 also, here is an overlay of the previously listed 6th deg. - red TT (STL) 04:30:21 11/16/05 I would say thats good enough. - Zluster(Sir Sam) 11:06:53 11/16/05 that's damn close for a simple comparison... - PennStateZ 12:37:03 11/16/05 here are the numbers - Max865(ATL) 19:35:33 11/16/05 Well why dont we just arbitraily .... - Zluster(Sir Sam) 00:45:27 11/16/05 are the tables avaliable in excel format? - Max865(ATL) 09:39:50 11/16/05 Ok cool. - Zluster(Sir Sam) 00:02:15 11/16/05 what about Rob's pistons having slightly lower compression? - Shawn300zTT GT28R MD 00:23:19 11/16/05 Rob's effective compression should be right at 8.5:1 - Ash's Z 00:34:58 11/16/05 isn't stock 8.5:1? - Shawn300zTT GT28R MD 00:54:09 11/16/05 Not unless you specify otherwise when ordering the pistons, - Ash's Z 01:06:33 11/16/05 oh okay, gotcha. I do know that Dee's compression - Shawn300zTT GT28R MD 01:17:28 11/16/05 8.8:1 CR according to a good source --> LINK - Z-Jay (Edmonton, AB) 09:46:28 11/16/05 I meant, *static* compression. (n/m) - Ash's Z 01:07:55 11/16/05 my car has a built bottom end w/ 8k miles on it - Z32POWER.com 06:04:14 11/16/05 those are zemaestros manifolds, stock and heavily ported (n/m) - jawz 09:55:54 11/16/05 check your yahoo email please (n/m) - Z32POWER.com 14:13:30 11/16/05
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