R33 Gts-t Camshafts & Cam Gears Upgrade

[Smitizen]

I'm looking to upgrade my cams and cam gears on my R33 GTS-t.

I've already had installed a bigger turbo(GTRS), injectors, fuel pump and so on and am making a comfortable 255atw currently.

Tomei 256 or 260's have been recommended as well as Tomei adj. cam gears.

Are the perfromance gains worth pushing my engine towards 270kw+ which is getting closer to popping point?

Or will the camshafts take a bit of stress off the internals anyway?

Cheers dudes!

[r33cruiser]

im looking into it for my needs aswell

http://www.nengun.com/hks/camshafts-nissan

im lookin to go 264 with 9.0mm lift.

but looks like thats only on the exhaust size :S

if your looking to go bigger than 256, 8.8mm lift u are looking at solid lifters=$400

further valve springs are beneficial.

all up= 1500-2000

once u do that u can go past 270kw.

u wont need gears because they are preset, from what i have read

[Smitizen]

im looking into it for my needs aswell

http://www.nengun.com/hks/camshafts-nissan

im lookin to go 264 with 9.0mm lift.

but looks like thats only on the exhaust size :S

if your looking to go bigger than 256, 8.8mm lift u are looking at solid lifters=$400

further valve springs are beneficial.

all up= 1500-2000

once u do that u can go past 270kw.

u wont need gears because they are preset, from what i have read

Any idea what the difference in drivability will be between 264 and 260?

And that was a very handy little website (nengun) that you left an attachment for.

They've got some seriously cheap arse parts!!!

[R31Nismoid]

considering your really near the limit of the stock motor, is the extra few kw worth it?

Although i dont see how you cant make the extra power with a couple psi more!

Tis a good question to ask yourself

FYI i ran over 300rwkw with the factory cams/head etc etc.

Response i had was as good as anyone else here with similar engine specs and the cams

If you could spend cam $$ elsewhere, then i'd be looking at that.

[r33cruiser]

And that was a very handy little website (nengun) that you left an attachment for.

They've got some seriously cheap arse parts!!!

yea no worries man. this bloke has 260's on i think.

and this is how it sounds.

http://smg.photobucket.com/albums/v315/Tha...urrent=Idle.flv

ahoy hoy rotor freaks

but yea. if your going cams, springs, solid lifters etc.

go forgies man, or else all u will get is a nice sounding exhaust. no REAL success

Edited December 23, 2007 by r33cruiser

[Simon-S14]

what about 254 8.5 mm cams on a 25... im looking at this atm to gain a bit in the midrange torque wise... also maybe make the same if not little more peak power on less PSI... possible?

[Smitizen]

considering your really near the limit of the stock motor, is the extra few kw worth it?

Although i dont see how you cant make the extra power with a couple psi more!

Tis a good question to ask yourself

FYI i ran over 300rwkw with the factory cams/head etc etc.

Response i had was as good as anyone else here with similar engine specs and the cams

If you could spend cam $$ elsewhere, then i'd be looking at that.

I'm running 1.1 bar at the moment so don't think i'll be bumping it up anymore!

Do camsafts take some stress off engine internals???

Or was i listening to someone talking shit?

[r33cruiser]

isnt that more of an issue about compression. i only say this because i read that the team peer boss' 180 [shit forgot name]

only runs about 15 pound max.. but has bumped up the compression to help the powah.

but 254 8.5mm lift shud be sweet. u wont need springs or lifters and shit either. its not too aggressive.

Do camsafts take some stress off engine internals

no idea btw.

may have to try google

Edited December 23, 2007 by r33cruiser

[Smitizen]

yea no worries man. this bloke has 260's on i think.

and this is how it sounds.

http://smg.photobucket.com/albums/v315/Tha...urrent=Idle.flv

ahoy hoy rotor freaks

but yea. if your going cams, springs, solid lifters etc.

go forgies man, or else all u will get is a nice sounding exhaust. no REAL success

That's sounds off it's head man!

[NYTSKY]

I have 256 poncams in mine,made 250rwkw with highflow turbo.Reading the RB25 dyno tread many people are making the same power without them,so its up to you.

Hopefully they will carry me over the 300rwkw mark with the new turbo though

[Smitizen]

I have 256 poncams in mine,made 250rwkw with highflow turbo.Reading the RB25 dyno tread many people are making the same power without them,so its up to you.

Hopefully they will carry me over the 300rwkw mark with the new turbo though

Forget the power figures, how was the difference under the foot?

[joeyjoejoejuniorshabadoo]

Tis true you can spend the coin elsewhere ash, but any ideas as to whether the cams will help engine stress?

my guess is if you stay at 250rwkw with the cams installed on lower boost then you will stress it less but if you push it to 270 on the same 1.1 bar then there'll just be even more stress...

Edited December 23, 2007 by joeyjoejoejuniorshabadoo

[gtst25]

I've got 256's 8.5mm lift and they sound stock. I'm not sure if the 5mm extra will make it sound that lumpy - if you're going to the trouble of valve springs and lifters I don't think it's be worth the money spent. 1500 - 2 grand for a small amount of extra power... Forged pistons I can't see the advantage as the gtrs will run out of puff before endangering the rb25 if you don't go silly.

Cheers

[RRob]

Do cams take stress off the internals?

In theory yes as your making the package more efficient.

[NYTSKY]

Forget the power figures, how was the difference under the foot?

Hard to tell because i had alot of other mods done the same time as the cams.Power went from 190 to 250rwkw so all i felt was heaps of power.

Off boost id say there might be a little increase in torque.

[R31Nismoid]

Do cams take stress off the internals?

In theory yes as your making the package more efficient.

Ye, it would... but that extra 1-2psi really isnt overloaded 'stress' as such.

Fair enough if you were talking 5-6psi

Would cams stress the head bits?

Especially in a 10yr old head... thats a good question to look at as well (i dont know the answer to it)

[khunjeng]

I looked into it and decided a new plennum and FMIC setup would be more useful for response.

your can go to 1.2/1.3 bar with stock internals and a high flow ... I have been running 1.3 bar now for over 1 year with little detonation and great performance.

I got some good results with just a set of cam gears on top of all the normal mods. I have a new plennum and short IC piping just not installed. Cheaper and looks cooler

[joeyjoejoejuniorshabadoo]

What is this plenum that is less than 700 schmucks you speak of? Is it an ebay copy job or the real deal? Does it let you keep your fuel rail and side feed injectors?

Edited December 24, 2007 by joeyjoejoejuniorshabadoo

[r33cruiser]

ebay manifolds are fine man. checkout this.

http://www.skylinesaustralia.com/forums/to...um-t181826.html

all the water galleries lined up...everyting was fine.

ebay is pretty decent... as long as there is no moving parts

[Smitizen]

Tis true you can spend the coin elsewhere ash, but any ideas as to whether the cams will help engine stress?

my guess is if you stay at 250rwkw with the cams installed on lower boost then you will stress it less but if you push it to 270 on the same 1.1 bar then there'll just be even more stress...

Yeah fair call mate.

So far the cons are far outweighing the pros!

Is is a fair bit of coin to spend but i'd love to get some more outta my current setup!!!