Subject	Well.... I have been playing around with the hi compression
Posted by	ConVerTT on March 13, 2014 at 11:19 AM
	This message has been viewed 387 times.
In Reply To	Thoughts on high-compression TT's motors post MJ's monster? posted by ZXoltan on March 13, 2014 at 07:13 AM
Message	TT configuration although at much lower power levels since 2005. ConVerTT 1.0 is still running just fine. Its is essentially a stock block with Stage 3 mods. Makes 350 /350 rwhp/rwtq on pump. Tuned by SpecialtyZ. Runs fine. (Yes a very long list of members have warned me of the impending "Boom". And I have tried to break it including 96 laps (192 miles) over two days at Oregon Raceway Park a few years back. Still waiting....) v2.0 is the identical car with stock NA block and full breather mods except a 2.5" catback. I have tried two different configurations with this car -gt28rs and subsequently sport 500s. Long story short - SpecialtyZ tuned the car in each configuration. In both cases we couldnt get past 430 rwhp (pump) due to detonation. So they backed the tune down to 420 and I have been driving it ever since - runs fine just like v1.0. The interesting thing with v2.0 - the dynos charts of the two different configurations (gt28rs vs sp500 same car) overlay almost perfectly. This was two years ago. At that time Greg and I discussed it at some length and came to the conclusion "the limiting factor must be the heads". Could be the cams, timing, or the physical configuration. So at that time I figured the next step was to change the heads to TT heads and some adjustable cam gears and see what happens. Basically never got around to it. (our local track closed, 420 rwhp is fine with a street car) So up to two years ago I would have said " hi comp runs fine with a proper tune but overall power is limited due to detonation" and " can't prove it yet but I suspect that the limiting factor is the heads, not the compression ratio..." So jump ahead to today. After reading MJs post I am absolutely convinced that he has found the key by freeing up the heads. As I mentioned, that would have been my next logical step as well. And then they have taken it a logical step further IMO - once you get the heads right, build the bottom end, tune it, and have at 'er :-) That said, I am completely BLOWN AWAY by their results. CLOSED For The SEASON :-(
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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