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lowering compression 

 

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 Post subject: lowering compression
Posted: Mon Nov 08, 2010 10:00 am 
Getting Side Ways
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Age: 25

Posts: 4599

Joined: 30th Aug 2010

Ride: BF XR6,

Location: NEWCASTLE
NSW, Australia

i already know lowering compression on a turbo charged engine prevents pinging/detonation, but is there more reason, ie: more boost can be ran, or lower boost will make more power with lowered compression?

 

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BF XR6
xr8 snorkel,typhoon lower snorkel,territory intake pipe,20% underdrive kit,pacemaker extractors,high flow cat,xforce exhaust,t56 conversion hd turbo clutch/ flywheel,m86 3.45 lsd,custom tune187.1rwkw as an auto

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 Post subject: Re: lowering compression
Posted: Mon Nov 08, 2010 9:31 pm 
Getting Side Ways
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Joined: 7th Nov 2004

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Power: 482 rwkw

Location: Penrith
NSW, Australia

8.5 is the lowest you should go unless your after 1000 h.p engine..
Having said that 9to 1 with forged pistons and rods makes a NICE quick responsive engine..
I have 7.8 [27cc dish] on my 330 V8 .. Yes it makes more power mid to upper but a good N/A can beat me off the line unless I virtually race it.. It's a manual which doesn't pre spool turbo's .. Rpm doesn't actually spool turbo's...
BUT I must say once spooled up and on power .. The bigger chambers = more bang= more spool = more bang.. You see it multiplies itself... Just takes some time getting going ...
Ok on a revable engine .. A 4.0 imo is best around 8.8 to 9.2.. Up to 350 rwkw..Then add C16 / Avgass on performance ...
Dropping compression is done to have wider tuning envelope where in most cases in std form [quality ??] cast pistons are used..In any case detonation will KILL any forged assembly..
Just takes .004 longer to break !!!

 

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As in ZOOM 126 edition
331 Dart block,3.25/ 4340 steel crank, Oliver rods,TFS ported track heat heads, TFS track heat inlet Twin SC61 turbo's
Project 1UZ-EF has started.. S475 Turbo 4.0 V8 Mustang Celica.....

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 Post subject: Re: lowering compression
Posted: Tue Nov 09, 2010 3:51 pm 
Getting Side Ways
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Age: 25

Posts: 4599

Joined: 30th Aug 2010

Ride: BF XR6,

Location: NEWCASTLE
NSW, Australia

thanks

 

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BF XR6
xr8 snorkel,typhoon lower snorkel,territory intake pipe,20% underdrive kit,pacemaker extractors,high flow cat,xforce exhaust,t56 conversion hd turbo clutch/ flywheel,m86 3.45 lsd,custom tune187.1rwkw as an auto

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