After looking at the FSM, this upgrade is not all that difficult. The solid lifters make things much easier to deal with. I did read the following valvetrain description that needs validation before installing the cams:
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A lot of work went into minimizing friction in the valvetrain in an effort to maximize fuel efficiency. Minimizing valvetrain mass allows the valve springs to be lighter, which reduces the amount of power wasted opening valves. To achieve minimum valvetrain mass, a direct-acting cam-on-bucket design is used. (See photo #7.) Unlike most direct acting valvetrains, there is no valve shim for adjusting valve lash. Instead, the entire bucket is available in different thicknesses when valve adjutments need to be made. Elininating the shim further reduces valvetrain mass. Valve adjustment isn't likely to be necessary during the normal service life of the engine because of the very light valve springs, but changing cams will likely require valve springs and a more complex adjustment procedure than the hydraulically adjusted SR20, or the screw-adjusted Honda engines.
The cam lobes themselves are also extremely narrow (much like Toyota's high-efficiency 1ZZ-FE engine) to minimize friction, and the base circle is narrower still.
The relatively small cam wiping pad offered by a direct acting valvetrain limits how aggressive the cam profile can be. By comparison, the larger pad available on a rocker arm like those in the SR20 or any Honda engine allow higher specific output.
It is the light valve springs, not the long stroke, that are responsible for the low, 6100 rpm redline. (By the time the engine reaches production, the redline may be raised to 6500 rpm, and could be as high as 7000 rpm if Inamijima gets his way.)
You see just how out of touch Nismo is with the spec-v when they release upgrades like these. Why would you change the suspension dynamics without offering a stinkin set of racing SHOCKS! Argh! Damn tuners should be required to race the stuff they develop.
And what the heck is a 'tuned set of rubber bushings'?
Quote:
Originally posted by 7SPEED Craig's and Lees next mods.........damn autox
NISMO R-tune Rubber Bushing Kit ('02-'04 SE-R & Spec V)
Price $279.30
NISMO R-tune Lower Tie Bar ('02-'04 SE-R & Spec V)
Price $143.75
Next race I can make is Sunday 6/22 over at TMS. Can't wait to break my Victoracers in. The 17x7.5s look huge for some reason. I'm hoping the car sets better with these or I'm stuck having to order a set of FLTA2s.
Quote:
Originally posted by tekmode Hey Craig, when you going autoX again? Maybe we can meet up somewhere before we go.
Originally posted by ck03specv Next race I can make is Sunday 6/22 over at TMS. Can't wait to break my Victoracers in. The 17x7.5s look huge for some reason. I'm hoping the car sets better with these or I'm stuck having to order a set of FLTA2s.
I can't make the TMS race. Gotta be one at Pennington
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