Cam Gears, Adjusting

[RB SANDY]

Cam Gears, Adjusting me and a mate where talking about my skyline and getting 200rwkw I said I need a computer and a Adjustable cam gear he said try and skip the belt over one tooth that should be about -4degrees and see how it goes, what do you guys think about this could it work.

Edited July 31, 2006 by RB SANDY

[paulr33]

not needed, plently making that power without it

[RB SANDY]

some people say you can gain up to 10hp

[Mr. Oizo]

dont mess with the timing belt

if you get it installed, get it tuned professionally

[paulr33]

ive got exhaust side cam gear

we gained zero

and just wasted time in having it fitted and fiddled around with

intake side may give 2kw not really worth the 400 odd to have it fitted and setup

[RB SANDY]

so are cam gears really worth it

[Mr. Oizo]

  RB SANDY said:

so are cam gears really worth it

I'd say its different for every car

Cam gears do give you a lot more options with tuning and your powerband, such as:

Advancing Intake and Exhaust: This will provide the car with more bottom end power, and will decrease top end. Advancing both cam gears will move overlap earlier but will not increase it.

Retarding Intake and Exhaust: This will increase the cars top end, but will decrease low end. Retarding both cam gears will move the overlap later and but will not change the amount of overlap.

Advance Exhaust Only: This will help the cars top end, and it reduces overlap.

Retard Exhaust only: This will help the cars mid range power, very useful for cars with big turbos / big cams. By increasing overlap, It decreases lag significantly. Doing this will bring the boost on all at once.

Advance Intake only: This will increase overlap and helps the cars bottom end and mid range power. This mod will bring the turbo on all at once.

[WazR32GTSt]

hang on are you saying you want to buy cam gears and adjust them one notch... or are you saying that the alternative to buying cam gears is to skip one tooth on the stock gears??

each tooth is 15deg, so skipping one tooth, as you say, will make it way way out and is a stupid idea

[RB SANDY]

alternative,each tooth is 15deg that is alot is that right

[Mr. Oizo]

  RB SANDY said:

alternative,each tooth is 15deg that is alot is that right

yes

usually you adjust it 1 degree at a time

[Munna1]

Mate I have looked into this and it comes down to this some people gain power some do not. Im getting my 100K service done shortly and getting a exhaust cam gear installed while I am at it. Apprantly the idea is to retard the timing by about 4 degrees it is meant to give you increased midrange and top end power. I will get the car dyno tuned and post before and after results.

mods are

full 3" exhaust

intercooler (hybrid)

11psi boost

safc2

195 rwkw

cheers

[R31Nismoid]

  RB SANDY said:

some people say you can gain up to 10hp

If you can feel a 7kw difference... that will surprise me.

Im yet to see conclusive evidence the cam gear will be of benefit on an stocker RB25

RB26, lots to gain, but you dont have one of those.

[WazR32GTSt]

everyone is missing the point here...

HE WANTS TO ADUST HIS TIMING BELT WITHOUT ADJUSTIBLE CAM GEARS

that's right, with stock gears

this is NOT possible. please DON'T do it. ditch the idea completely.

That is all.

[paulr33]

on a side note you can use the stock cam gears with a dongle fitted to adjust them. mine has a dongle fitted to make the exhaust side adjustable (gained nothing). so you can retain vct and have them adjustable

[BBQ]

  WazR32GTSt said:

everyone is missing the point here...

HE WANTS TO ADUST HIS TIMING BELT WITHOUT ADJUSTIBLE CAM GEARS

that's right, with stock gears

this is NOT possible. please DON'T do it. ditch the idea completely.

That is all.

Correct, some one picked up on it.. You need to adjust the actual cam shaft not the gear on the belt.. If you wish to invest in such item take it to a workshop that can do the work for you.

[bbe]

apparently you do this to the rb30single cam banger with good results !

[Cillham]

rb20 like is more it seems. 5rwkw - 20rwkw can be gained. Silvertop with mild mods went from 190rwkw to 210rwkw at my mechanics workshop last tiem i was there.

But as mentioned previosuly its abotu tunability, and playing with how the power is delivered.

[RB SANDY]

it's ok I wont do it

[The Alchemist]

my brain hurts

[r_speedfreak_r]

  darK said:

I'd say its different for every car

Cam gears do give you a lot more options with tuning and your powerband, such as:

Advancing Intake and Exhaust: This will provide the car with more bottom end power, and will decrease top end. Advancing both cam gears will move overlap earlier but will not increase it.

Retarding Intake and Exhaust: This will increase the cars top end, but will decrease low end. Retarding both cam gears will move the overlap later and but will not change the amount of overlap.

Advance Exhaust Only: This will help the cars top end, and it reduces overlap.

Retard Exhaust only: This will help the cars mid range power, very useful for cars with big turbos / big cams. By increasing overlap, It decreases lag significantly. Doing this will bring the boost on all at once.

Advance Intake only: This will increase overlap and helps the cars bottom end and mid range power. This mod will bring the turbo on all at once.

i suppose in ways your right but what your talking about is really inefficent. what u want to do is to increase the overlap keeping it symetrical. u want the intake to open earlier and the exhuast to close later by the same amount. so really u want to advance the intake and retard the exhaust. Defintly do not time the belt incorrectly by one tooth because theres a big difference between the valve being open enough to pass gasses & the valves hanging down low in the path of the piston. In respect to do they make a difference i say yes. it works on the kadenacy effect. it already exists but you just take further advantage of it which is exactly how extractors work and we all know they make a difference. it's also what vtec does & we all know how much power honda can get out of a na 4cyl engine.