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Message: <blockquote data-quote="shiroitenshi" data-source="post: 2328207" data-attributes="member: 27518">Good brand Vs all the same, some have different spring rates. Some maybe design-wise different, but they do the same thing, return the valves to the valve seats.The harder it is, the more wear it will cause, but it will be more reliable at high rpm.As for powerband, you'd be surprised at how different it will be.two similar spec B18C do not have the same powerband.. as dynoed before.I can only guess that it's due to the cam settings (or the extractor/exhaust choice), as even the peaks are sometimes different, even though the rest of the parts are the same.You're probably hitting 105-110kmh at 9K, not 9.5K (should be about there, I don't know your tire size so I can only estimate it.)If using 4.785, you're going to hit only 100kmh at 9K with 2nd gear, shift, and you'll end up just a little before 6.5Krpm (the meter will probably show 6.5-7)Since you don't have a dyno.. I suggest looking for a second hand RSM and a g-sensor. you can see how your power is like by taking a pull from 3rd from pre-3000rpm to rev-cut (or your own manual rev-cut, if you're not limited.)Then you can see the point where acceleration is the greatest.I already know mine... now using a non-rev cut ecu, and the car acceleration actually is slower past 8Kwhen I used the auxbox to test. (O_o)</blockquote>

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