RE: The myth of low CR with high boost

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RE: The myth of low CR with high boost - 5/25/2006 5:01:34 PM    Kappa22 Posts: 3100 Joined: 12/4/2004 Status: offline D sleeves are good for a lot more than people give them credit for. _____________________________ Your Forum Turbo Groupie... Also your official Forum EF and GTR Brain-Trust (in reply to larsenracing) Post #: 11

RE: The myth of low CR with high boost - 6/24/2006 10:39:06 PM    Marty Posts: 8262 Joined: 1/27/2005 From: TN Status: offline ^ yes very true _____________________________ If you are over 18 years old in the United States and do not vote do not bitch about local, state, and national laws. This includes fix it tickets, big speeding fines, and high taxes(gas prices included) (in reply to Kappa22) Post #: 12

RE: The myth of low CR with high boost - 8/7/2006 8:49:15 PM    StinkBOMB   Posts: 18 Joined: 8/3/2006 Status: offline With what reliability would one expect to run 12 psi on 11.5 cr? For how long, and would that be driving it hard or taking it easy? (in reply to Marty) Post #: 13

RE: The myth of low CR with high boost - 8/7/2006 9:05:00 PM    finalimpact Posts: 1798 Joined: 3/7/2005 From: NC Status: offline depends on who you get to tune it as well as the quality of parts your using. _____________________________ (in reply to StinkBOMB) Post #: 14

RE: The myth of low CR with high boost - 8/7/2006 9:25:46 PM    pWnEdU Posts: 1194 Joined: 6/4/2006 From: Care-a-lot Status: offline I, on the other hand, believe that lower compression is part of building a reliable F/I motor. A lower compression engine will run cooler, will last longer (especially the rings), and be more reliable/easier on parts that a high compression motor with boost. I'm not saying you CAN'T run high compression, but I don't think it's the proper way to do it. _____________________________ (in reply to finalimpact) Post #: 15

RE: The myth of low CR with high boost - 8/7/2006 10:05:32 PM    StinkBOMB   Posts: 18 Joined: 8/3/2006 Status: offline Let's just use stock internals as the meter on this scenario. How long would the stock internals hold up under that pressure? We'll say going to the track twice a month, and using it as a daily driver. I subscribe to the lower compression school of thought. (in reply to pWnEdU) Post #: 16

RE: The myth of low CR with high boost - 8/7/2006 10:06:49 PM    Fiirkan Posts: 10321 Joined: 11/7/2005 From: Cornwall, PEI. Status: offline wow i didn't realize that you guys made this a sticky... cool _____________________________ (in reply to pWnEdU) Post #: 17

RE: The myth of low CR with high boost - 8/7/2006 10:10:01 PM    StinkBOMB   Posts: 18 Joined: 8/3/2006 Status: offline Is 12,000 miles a fair estimate? Or am I underating stock internals on a K series motor? (in reply to Fiirkan) Post #: 18

RE: The myth of low CR with high boost - 12/26/2006 11:24:10 AM    olengrumpy   Posts: 8 Joined: 12/25/2006 Status: offline A little long but I hope this helps you   There are a few manufacurers making what they call "light boost" motors.. They run normal compression ratios and small turbos with light boost for a little more top end.    Kappa22 and Larsenracing as well as others gave you some good advice..   You had better have a well built motor and high end controllers to control things such as ignition timing retard etc. if you plan on doing this...   The more compression you have the more cylinder pressure you create. Aspirtating the engine creates huge cylinder pressure..   As we know. engines are air pumps. Simplfied, as there are hundreds of variables... Let's say one cylinder normally contains 25 cubic inches of air.  With a good turbo or S/charger @ about 15 PSI that cylinder will now have about 50 cubic inches of air.. So your engine acts like it is twice it's size..  Now comes the downside.. The compression in that cylinder is now probably 15-1 or more.. So you need controllers to properly handle that much compression.  You need to greatly reduce the total ignition timing and add enough fuel to light this off..    With lower compression pistons, you can still pump in that same amount of air and gain that cubic inch increase without as much compression increase as you would with high compression pistons..   That is the reason most turbo motors run lower compression ratios.   I hope this helps you..   (in reply to StinkBOMB) Post #: 19

RE: The myth of low CR with high boost - 1/18/2007 2:20:59 PM    a976tms   Posts: 10 Joined: 1/14/2007 Status: offline its been true for me to get more power out of 5psi with a good tune then 12 psi with a poor tune.just my .02 (in reply to olengrumpy) Post #: 20

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