Subject	Re: Higher static compression within the cylinder creates an
Posted by	ajmshred on January 26, 2007 at 12:01 AM
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In Reply To	Higher static compression within the cylinder creates an posted by Ash's Z on January 25, 2007 at 09:20 PM
Message	:The higher compression also notably hurt spoolup response of the turbochargers. This is due to the fact that the higher compression engine will convert more of the thermal/pressure energy into mechanical force on the piston and less of that energy is available out the exhaust port to get the turbos wound up. On the other side of the coin, a low compression engine will spool the turbos up notably quicker than the same engine with higher compression. This can be seen in a few TT's that have been built: Joel Grannas's Sport-600 powered TT and my own personal Z32 - both of which are at about 8.0:1 compression. I am not one to doubt you Ash, but have you only seen this trend in Z32's? I am sure you can agree with me that this at first is counter-intuitive. I would be interested to read more info about this. Perhaps there are some journals out there that explain this.
Follow Ups	Why can't an NA motor w/ turbos be boosted high? - ZCulture 21:09:30 01/25/07 Higher static compression within the cylinder creates an - Ash's Z 21:20:24 01/25/07 Here's some dynocharts to show some stuff >>> - Ash's Z 21:34:43 01/25/07 The torque at 15psi on the NA looks lower than - AzHeat 14:52:58 01/26/07 so there anyway to change the compression? (n/m) - Heavyarms2050 21:52:27 01/25/07 thicker head gasket - SpecNATT (Houston) 22:09:38 01/25/07 Re: so there anyway to change the compression? - awesom-o 22:11:15 01/25/07 like what ? - ztunerz 08:05:02 01/26/07 Wrist pins, oil pump - awesom-o 10:30:49 01/26/07 Re: Higher static compression within the cylinder creates an - ajmshred 00:01:03 01/26/07 Thanks. I've always enjoyed your posts and - ZCulture 01:42:52 01/26/07 You make is sound like retarded timing is a bad thing? - AzHeat 14:32:12 01/26/07 the 335i has direct injection. - apudapus 23:09:52 01/25/07 Good point.. - ZCulture 01:40:59 01/26/07 You're also talking about car that was designed to do that (n/m) - Broke_as_**** 23:29:39 01/25/07 uh, a 300ZX TT motor doesn't 'put up' over 25 psi - vorpalZ 00:21:49 01/26/07 Thanks... - ZCulture 01:38:51 01/26/07 here is why >> - ztunerz 08:01:13 01/26/07 I don't think we'll ever see aftermarket direct injection - aliaZ 09:38:27 01/26/07 What do you think diesel engine combustion chambers - AzHeat 10:45:56 01/26/07 focus, Mike - aliaZ 11:05:52 01/26/07 Most diesel engine's combustion chambers are in the piston - Tuppidsay 11:47:45 01/26/07 The gasoline engine gets a lot its technology from - AzHeat 12:46:09 01/26/07 I took the Auto/Diesel Technology courses at UTI. - Tuppidsay 18:18:48 01/26/07 In direct injection, under heavy load - ZCulture 13:24:43 01/26/07 also, the wrist pins in the NA are weaker than the TT, - CRAZZEPETE. 08:57:10 01/26/07
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