Compresion ratio
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Someone that spends his life on FitFreak.net
Joined: Feb 2006
Posts: 1,092
From: san francisco, ca, USA
Compresion ratio
Is the fit's compression high? it's 10.4:1. I was reading the review for skyline redline which has a compression of 9.2:1, which edmunds says is "relatively high" http://www.edmunds.com/insideline/do...ticleId=116655
If 9.2 is high, so is fit's 10.4 right? How certain are we that we shouldn't go higher than reguloar unleaded?
Boost peaks around 18 psi, and power builds progressively without obvious lag and with useful off-boost torque, thanks to a relatively high 9.2:1 compression ratio and variable valve timing on both cams.
Member
Joined: Apr 2006
Posts: 531
From: washington
9.2 is a little high for a boosted motor but 10.4 is not too high for a NA motor with modern engine management computers. This is an apples to oranges comparison.
As for the answer to your question, it would be best to look at the compression ratio of cars with premium recommended. Anybody out there have info on this?
There have been lots of other threads pertaining to octane and fuel grades.
As for the answer to your question, it would be best to look at the compression ratio of cars with premium recommended. Anybody out there have info on this?
There have been lots of other threads pertaining to octane and fuel grades.
Member
Joined: Jun 2006
Posts: 683
From: milwaukee, WI
Member
Joined: Jun 2006
Posts: 683
From: milwaukee, WI
yeah i noticed skunk 2 installed lower compression pistons to lower the compression for the turbo kit. that is probably the smartest cause you can always make more power by turning up the boost but put the motor in much more risk for detonation if you still ran the stock compression. turbos make it too tempting to add boost by turning a dial or pushing a button, but I still like em
Four Wheels Enthusiast
Joined: Apr 2006
Posts: 2,460
From: Austin TX, USA
yes, nice move on their part..
you would prorably want to do the same thing if you used NOS huh
what if you were to lower the compression w/ out adding boost or NOS? what would happen.. massive power loss?
you would prorably want to do the same thing if you used NOS huh
what if you were to lower the compression w/ out adding boost or NOS? what would happen.. massive power loss?
Last edited by sLiVeRwOrM; Sep 5, 2006 at 03:15 PM.
Member
Joined: Jun 2006
Posts: 683
From: milwaukee, WI
Originally Posted by sLiVeRwOrM
yes, nice move on their part..
you would prorably want to do the same thing if you used NOS huh
what if you were to lower the compression w/ out adding boost or NOS? what would happen.. massive power loss?
you would prorably want to do the same thing if you used NOS huh
what if you were to lower the compression w/ out adding boost or NOS? what would happen.. massive power loss?
Member
Joined: May 2006
Posts: 137
From: Wallis in Switzerland
Originally Posted by jits14
yeah i noticed skunk 2 installed lower compression pistons to lower the compression for the turbo kit. that is probably the smartest cause you can always make more power by turning up the boost but put the motor in much more risk for detonation if you still ran the stock compression. turbos make it too tempting to add boost by turning a dial or pushing a button, but I still like em
He have 600hp... (he limit the HP on 1-230hp, 2-300hp, ...)
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