Subject	Thoughts on high-compression TT's motors post MJ's monster?
Posted by	ZXoltan on March 13, 2014 at 7:13 AM
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Message	Is this the new trend? Is it only suitable for large turbos or good for smaller ones as well? Does this improve spool on bigger turbos? Seems like detonation would be a big issue unless running very high octane fuels. Is lower compression safer/more reliable even with a good tune? Isn't that why Nissan used low comp pistons from the factory? On the other hand, it seems that compression is going to drop somewhat when you enlarge the bowls in the head to prevent shrouding of the larger valves. I have no idea to what extent. Apparently cams and adjusting cam timing has a big effect as well. How does this all play into detonation? At what point are gains from increasing piston compression lost when making these other changes? Personally I would rather not sacrifice reliability for a few extra ponies, but maybe there's more to this.... Would love to hear commentary from people much smarter than me about this stuff:-)
Follow Ups	Thoughts on high-compression TT's motors post MJ's monster? - ZXoltan 07:13:15 03/13/14 Ive been pondering the same thing.. - eriksu9 08:59:52 03/13/14 silly analogy. - Antihero 11:28:06 03/13/14 WTF was your dad Ron Burgundy? - LJZTT 11:41:53 03/13/14 I am simply responding to Brandons statement - eriksu9 08:51:11 03/14/14 poor analogy. fatigue vs catastrophic event - Antihero 10:16:26 03/14/14 I get what you are saying, most of us feel the same way and - LJZTT 11:39:27 03/14/14 I dont know if you know this or not, but the word - eriksu9 12:00:40 03/14/14 "When in Rome..." (n/m) - LJZTT 15:35:44 03/14/14 Remember the time I crawled out of my mom's vagina? - black300zx 07:42:15 03/15/14 I never got a reply from them on my post in the thread. - Woody75 (Denver) 09:13:51 03/13/14 big turbos let the engine make more power - Zvil (FL) 09:57:07 03/13/14 ^^^This, except for the not daily driven part. - rcmadness 11:04:04 03/13/14 Great work! What else can you tell us about the heads? - ConVerTT 11:34:57 03/13/14 tempted to leave the stock flat top pistons in my vh45dert - Zvil (FL) 11:51:14 03/13/14 I didn't see where they said they backed of the timing. - Woody75 (Denver) 12:54:16 03/13/14 Woody, the dyno isn't setup to record boost - rcmadness 13:03:18 03/13/14 The picture posted wasnt very clear. - Woody75 (Denver) 14:13:45 03/13/14 Re: Woody, the dyno isn't setup to record boost - 1blackz 15:38:08 03/13/14 Woody here are my thoughts - induetime 14:55:33 03/13/14 What are the chances that the dyno was not correct? - eriksu9 08:54:03 03/14/14 You can't really manipulate a Dynojet like that. - dogpile 09:02:05 03/14/14 smoothing was 5 (n/m) - rcmadness 11:43:31 03/14/14 If you see/listen to enough dyno's..... - The Hawk 19:15:28 03/14/14 You have to weight compression vs ignition timing vs octane - ztunerz 10:16:29 03/13/14 In my opinion, camshaft duration plays a large roll in this. - LitlElvis 10:42:20 03/13/14 this - JaffaUK 11:13:40 03/13/14 Totally agree... - rcmadness 12:14:47 03/13/14 I was thinking from an intake closing point of view - LitlElvis 15:23:08 03/13/14 I just spent a year driving a high compression TT - xpwarrior 11:01:23 03/13/14 He does have some ridiculous injectors on there. (n/m) - Nate (NoVA) 11:02:17 03/13/14 Well.... I have been playing around with the hi compression - ConVerTT 11:19:03 03/13/14 and E85 for higher boost (n/m) - JaffaUK 11:23:59 03/13/14 Unfortunately, E85 is not commonplace in Canada like it is - MixManMash 17:20:51 03/14/14 There's a difference between enthusiast and factory - BlackholeZ 16:20:23 03/13/14 Wasn't there a theory against high compression + boost - hunterg 21:23:18 03/13/14 Here's the post I was referring to actually - hunterg 21:32:12 03/13/14 Assuming cams are stock and cam timing unchanged. - bartz32tt 23:01:02 03/13/14 well... - Antihero 09:13:03 03/14/14 I know little about all this but I do know that you cant - LJZTT 15:37:58 03/14/14 A lot cooler. That's why you can't really even compare it to - dogpile 17:38:53 03/14/14 ^ This guys knows. - The Hawk 19:17:46 03/14/14 Me? Thanks I guess - dogpile 00:40:08 03/15/14 I found VERY interesting info - SEE LINK - BEASTT 02:05:30 03/14/14
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