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R33 Cam Cover

Bruno P
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Bruno P Explorer

Bruno P

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Hi guys, I have an R33 gtst and have removed vvt and have greddy aftermarket cam gears, as these look nice I have not put the standard cam cover back on. I'm now in the process of wanting to put a clear cam timing cover on as I dont want to run the risk of a bolt or something dropping down onto the belt, but unfortunately the clear ones to suit an rb25 for sale all have the bulge sticking out for the vvt, can an rb26 clear cam cover fit an r33 gtst series 1 without v v t. and does the backing plate line up. Nito http://www.nitto.com.au sell clear cam covers, would an rb26 fit an r33.

There are a few more brands out there but they say RB26 on them and would look silly on an r33, the nitto brand does seem the better option providing it would fit as it only has Nitto printed on the cam cover.

Can anyone help assist if they have done this before as all the people selling clear timing cam covers can not assist me.

Regards

Bruno

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gotRICE? Veteran

gotRICE?

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You will need to trim the RB25 backing plate slightly and then the RB26 clear cover will fit.

Stupid descision to get rid of the VCT. Basically got rid of the best thing about a RB25.

Indeed. Heres a good example of my R33. Car was tuned to 5000rpm, this is because any further and the dutys were @ 100%, fuelpump dying :( .

First, with VCT OFF. then again with VCT ON. Pretty black and white.

overlayvct-novct.jpg

Seat of the pants is pretty clear too. If i was you, i wouldnt worry about pretty cam gears and clear covers. Sell them and spend it on something more worthwhile!

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Bruno P Explorer

Bruno P

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That graph is impressive.

Yes I couldnt agree more, five years ago when I did a full rebuild my mechanic didn't advise me of this, we purchased the greddy adjustable cam gears and tomei poncams, obviously we bought the inlet poncam to suit the greddy gears and not the poncam to suit VCT. for anyone out there which I doubt has done this if you buy poncams you must specify if the inlet is for VCT or not. It was his first skyline he had ever built so there was the first mistake.

But can the adjustable greddy inlet cam gear be adjusted to compromise for no VCT and mine obviously has timing marks -20 + 20 degrees? for those upgrading to aftermarket cam gears do you normally only upgrade the exhaust side on an RB25det.?

Plus when it was built it went in with 210 rwkw and came out with 297rwkw so for me not having VCT wasn't noticable because I gained so much horsepower from rebuild.

When does VCT kick in I thought it was from 5000rpm to 7000rpm?

Would you guys recommend upgrading my inlet cam and putting VCT back on?

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PM-R33 Grand Master

PM-R33

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VCT is for low to midrange power. Therefore it is enabled pretty much from the second you touch the throttle till around 4000-5000rpm (depending on setup).

HKS and Tomei both do cams to support VCT, however both are 256 duration and 8.8mm lift. Therefore the only reason people usually get rid of VCT is if they want large duration and large lift cams. Otherwise you do not get rid of it.

I personally wouldn't bother trying to get it back as it will cost you a bit of money and if you are currently happy with the setup that is all that matters.

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gotRICE? Veteran

gotRICE?

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Yeah. Its ON from 1100rpm or so stock till 5000rpm/ish.

We were basically tuning it to find the best pont for it to switch off. But seeing as the pump died we never got to see when the power and torque falls off, as you can see it doesnt look like its stopping anytime soon!

I didnt realize your car was that powerful. If you think it drives fine then dont bother going back if its going to cost alot of money! I just saw it as someone bought gears cos they were pretty and thought theyd help :) haha.

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PM-R33 Grand Master

PM-R33

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Well I do have tomei poncams 256 duration and 8.8mm lift, isn't that what everyone goes for when upgrading? or are you saying if you go bigger than these cams then you get rid of vvt?

Yeah you would have bought a RB20 inlet cam in those specs. Basically the cams are exactly the same other than the end where the VCT gear bolts on.

So really you could have just kept the VCT and bought the exact same camshaft you have but made for a RB25 VCT inlet.

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Bruno P Explorer

Bruno P

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Yeah well the wost thing about that is when I did upgrade to tomei poncams I did originally buy the one to suit vvt on the inlet, but my bloody mechanic said I bought the wrong one becuase it didnt suit the greddy cam gear so I sent it back and they then sent me the one without vvt which is obviously RB20 inlet cam. Spewing.

I'ld rather have vvt than a greddy cam gear which is set to 0 degrees anyway, whats the use.

Hey I got another question for you guys, I was told earlier in the post that an rb26 clear cam cover (which I just bought) will suit an rb25 without vvt but I will need to trim the rb25 backing plate a little to fit the rb26 clear cam cover.

so my next question is will an rb26 cam cover backing plate fit on an rb25 and line up properly, reason I ask is since I bought an rb26 clear timing cover to go onto an rb25 without vvt wouldn't it be better to buy the backing plate to suit the cam cover so I wont have to trim the rb25 backing plate for hours?

BP

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