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Adjustable Cam Gear On Rb25det Neo

walkoau
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walkoau Mentor

walkoau

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thinking about putting a set of adjustable cam gears on my r34 rb25det neo, just wondering if anyone has some tips they can share or run into any problems installing them? what to do about the variable cam timing on itake and exhaust? if anyone has done this with a neo engine pics would be great if you could post them up.

thanks.

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SAMFISHER Enthusiast

SAMFISHER

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R33 & R34's have variable intake timing only and yes you can get decent gains by adding an adjustable cam gear on the exhaust side.

Best time to do it is when you need to change cambelt and associated tensioners and do it all at once.

A decent mod for $200.

No point doing it for looks though as it will be behind the cover.

walkoau Mentor

walkoau

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R33 & R34's have variable intake timing only and yes you can get decent gains by adding an adjustable cam gear on the exhaust side.

Best time to do it is when you need to change cambelt and associated tensioners and do it all at once.

A decent mod for $200.

No point doing it for looks though as it will be behind the cover.

i was actually looking at putting the adjustable cam gears and gates timing belt on and modifing the greddy rb26 clear timing case to suit the rb25. but if the intake cam gear still has to have that ugly alloy cylinder on the end of it, it may be pointless doing the mods as i was only really interested in doing it for the looks.

walkoau Mentor

walkoau

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Yes it will look good mate. I have heard mixed results in regards to performance by ajusting the exhaust cam gear but could not get a straight answer on this. Has anyone here completed this mod with noticable results?

but what about the ugly cylinder on the end of the intake side cam gear????

wolverine Grand Master

wolverine

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Posted (edited)
Yes it will look good mate. I have heard mixed results in regards to performance by ajusting the exhaust cam gear but could not get a straight answer on this. Has anyone here completed this mod with noticable results?

yes, but then i replied before. when u do the timing belt it is a no brainer on an R33. you should pick up around 5-15kw most of the way thru the rev range. roughly 4 degrees give or take depending on what you get on the dyno.

R34 neo engines seems to be no gain.

Edited by wolverine
skidkid Proficient

skidkid

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Walkoau, Pm'd SK from Stagea page with fitting adj. cam gear to NEO. VVT on inlet, can fit a.c.g. to ex. I have an R33 gear to put on my Stagea. SK has run his at -4deg so far. Great post in Stagea page showing how to fit (in DIY).

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walkoau Mentor

walkoau

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Walkoau, Pm'd SK from Stagea page with fitting adj. cam gear to NEO. VVT on inlet, can fit a.c.g. to ex. I have an R33 gear to put on my Stagea. SK has run his at -4deg so far. Great post in Stagea page showing how to fit (in DIY).

thanks for the info, so no need to fit a a.c.g to inlet side cam because of vvt, only worth doing on the exhaust.

Munna1 Proficient

Munna1

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Posted
yes, but then i replied before. when u do the timing belt it is a no brainer on an R33. you should pick up around 5-15kw most of the way thru the rev range. roughly 4 degrees give or take depending on what you get on the dyno.

R34 neo engines seems to be no gain.

I hope your correct I am up for my 100k service shortly. I will have one fitted and dyno tuned with my SAFC2 and post a back to back comparison. The charts I saw were putting out low power to start with then I saw an extra 15kw or so like you said. Im making 195rwkw already so hopefully this mod will push me over 200rwkw.

cheers

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