Quote:
Originally Posted by BGTV8
No, because if you want to run "big" cams, you have to ditch the VVEL.
VVEL "is not" motorsport quality technology (jury is out on reliability) and the potential for VVEL actuator failure in hi-rev and hi-vibration environment is just not worth the risk.
Only Nissan understands the relationship between piston position and valve clearance and reverse engineering it will be a b1tch.
Ergo, if you want 400+ the only reliable way will be with HR heads.
I have not doubt you can make 400+ with VVEL, but you might lose 2 or 3 engines getting the level of knowledge, UNLESS you can get access to the OEM Nissan model for valve timing and lift vs position of the piston in the bore. then you need to be able to play with cam timing - it is just too hard !
It is not an investment I would make
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This is not an accurate statement. Yes you can make 400 whp and yes you can run "big" cams 282's from Jun is what 1slow370z ran. No you do not have to delete VVEL. Yes you can work on the heads by upgrading the exhaust cam, port and polish, you can go 1mm over on valves and also upgrade the valves... All while keeping VVEL on an NA car. I was with 1slow370 the night he put his car on the dyno untuned... It put down consistent 354rwhp untuned! With e-85 they were able to get into 375rwhp. This was stock displacement with forged internals. If you want 400rwhp get a 4L stroker kit and go down the same path as 1slow370. Also use the z1 headers as people are making 342rwhp with just intake, intake plenum mod, headers and exhaust.
Most people will say no it's not possible... Well they haven't tried. Also, VVEL is not a weak point in this motor! It's just different and requires working with the system to make power. Put it this way we have 1000rwhp 370z with VVEL on my 4.5L and I have built heads.