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I am currently in the process of having my RB26 rebuilt for my r32 gtr and was looking at fitting adj cam gears to it but want to know more before I do. The motor will be pretty much standard except for exhaust and boost increase as it is to see only a small amount of track work for such things as sprints and hillclimbs etc but also be very driveable so I can take it on long trips. Do the cam gears alter the drivability of the car? The longevity of the motor etc??

****.
 

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If the cams are std then the driveability of the car will be the same.

The adjustable part of the cam gears won't affect the driveability it is how you adjust them that will determine any rough idling etc..

if you put in huge cams then you won't be aiming for 400 bhp so as long as you stick to your plan and just lightly modify (like you mention in your post) the cars feel will not be compromised.

decide before the work is done what you want to build and what you want in the end and then follow the path that leads to that.
it'll cost you a fortune if you build the car for say 450 then decide 550 would be better then you'll probably want 600 and each step is a rebuild if you get the wrong parts wheras you can do it in stages if you think "I may want 600 one day" so you buy a huge intercooler now, an extra £600 i hear you say but that is better than buying one for 1200 then buying another for 1800 the list is endless.

have fun

Steve
 

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Cam gears are definitely worthwhile doing.

If set correctly, all the alterations to drivability will be positive and there is no effect to longevity of the motor.

If you are planning on doing track days and hillclimbs i would suggest you fit an oil cooler as well.
 

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Hi,

I was thinking of doing the same mod. My GTR is close to stock with only a cat back and the boost restrictor removed to run around 1 bar of boost.

I've read many articles and heard a few people say that with the right timing and tuning you can have a gain across the whole rev range and it sometimes allows you to produce boost earlier.

I think I will be doing this.... but does anyone know which brand is better... I was planning on getting the HKS ones.
 

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Croydon Auto Sports specialise in tuning imports, you will always see a couple of imports parked out the front of their place, check them out.
 

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Brand does not matter, they all do the same job.

Cons, like what was metioned before really none.

The best thing about them is that you can change your LSA at will along with adv or retarding your cam, this will change when the power hits, but in return make your idle a little rougher. It all depends on what you want out of your car. From what I have read, stock cams will really see no benifits, since the power band will max out before any adjustment of the cam angle change, do to the smaller duration of the stock cam. This is my understanding of it.

An increase in LSA, makes your power narrower as well.
 

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400R in the u.s? the 400R is a concept car, unless THE concept car is going to the u.s then i don't think there is a 400R in the states.
 

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Guy,

You are the man:)

Badmata, is the dumb kid from the states who thinks he owns a plethora of Skylines. He has even said that he owns a 400R here in England. Which is impossible, since Guy just pointed out there are none here.
 

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this may sound stupid, but after reading your posts upthere i dont understand jack what you guys are talking about. can somebody give me in laymen term what does adjustable cams do? and what are the side-effects of having one installed in your car?


p/s: sorry for the bad engrish...... (i'm renouned for that) feel free to correct any grammar mistake that i may have in my post.:D
 

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Cam gears are used to alter the cam timing.
On motors with a single cam it is merely used to shift the power curve in the rev range.
On engines with twin cams you can fit one each to the intake and exhaust cam and alter the timing independently. The general rule is to advance the intake and retard the exhaust cam timing.
It is fairly straight forward to install but hours could be had on the dyno to fine tune them as half a degree on each of the cam gears will effect the power output and delivery.
Excellent gains could be had from this mod even with stock cams.

Only side effect i can think of is the slippage of the gear which will result in vehicle running in real bad tune. With quality brands like HKS, Tomei, Jun etc. this should not be a problem.

Below are some pictures if you haven't seen already.

Stock engine with timing belt cover on.


Engine with Tomei cam gears fitted and timing belt cover off.


Engine with adjustable cam gears and clear timing belt cover fitted.
 

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i wouldnt use the hks cam gears as the are aluminium and i have seen several gtrs jump teeth and bending valves as they wear out over a period of time.personally i would use jun.
 
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