compression vs boost?
compression vs boost? if you give up a point in compression approxamatly how much more boost can you run? for example: stock ls1 is 10.1 and lets say good tune 8psi on good pump gas. if you lower it to 9.1 what could you raise boost to? also your losing power dropping compression right? so what are you gaining with the additional boost if any? t.i.a.
I was told that a full point drop in compression would require 1 lb increase in boost to make up the difference.
But to answer your question... well let's see if there are any generalizations that apply.
Seems like 9psi intercooled is the average safe max that I see in this section.
Let's drop the compression to 9:1... Well I do see folks running 12-15psi with 9:1 and even lower compression. So it 'appears' to me that folks are able to run a few more lbs of boost with a point or more of compression drop.
But to answer your question... well let's see if there are any generalizations that apply.
Seems like 9psi intercooled is the average safe max that I see in this section.
Let's drop the compression to 9:1... Well I do see folks running 12-15psi with 9:1 and even lower compression. So it 'appears' to me that folks are able to run a few more lbs of boost with a point or more of compression drop.
damn i was going to post this exact question yesterday...haha...anyway
i see people with bone stock motors and turbos making 570-580rwhp on 11psi and 600rwhp on 12ish. the question was going to ask was with my stock heads, stock cam and stock ls6 intake and 8:5.1 compression plus a forged bottom end....what boost am i going to need to hit 600rwhp?? i was guesing 13-14psi....and i want that on straight 93. what do you guys think?
my other question was what how much boost should my t44s put out?
i see people with bone stock motors and turbos making 570-580rwhp on 11psi and 600rwhp on 12ish. the question was going to ask was with my stock heads, stock cam and stock ls6 intake and 8:5.1 compression plus a forged bottom end....what boost am i going to need to hit 600rwhp?? i was guesing 13-14psi....and i want that on straight 93. what do you guys think?
my other question was what how much boost should my t44s put out?
Im kind of a FI newbie, so can someone tell me why instead of running a bigger SC/turbo for more boost, people just dont up their compression ratio?
Like running 12:1 compression with 10lbs of boost, instead of going with more boost on lower compression?
Like running 12:1 compression with 10lbs of boost, instead of going with more boost on lower compression?
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TECH Fanatic
Joined: Feb 2005
Posts: 1,123
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From: Maypearl, TX
gotta keep the boost at a minimum on higher compression engines;5-6lbs of boost on a 10:1 or 10.5:1 is considered fairly safe by most people here, but to run much higher boost, you'll need to lower the compression (and forge bottom, build heads to handle load).
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Originally Posted by Valkyn
Wouldnt 8:1 compression and 15lbs of boost make the same power as 12:1 compression and X (10?) lbs of boost?
Originally Posted by ZDOG
so sacrifice compression because boost pays back more right????