Rb25 Cam Shartfs

[falky929]

hey guys

was looking at putting some cams in my rb25

was wondering whats the best size to go for mid range to top end power and what has to be done to put them in.

i was looking at either 256s ive read theses are pretty much drop and dont have to change much or 264s whats needed to put these in?

[R31Nismoid]

Depends on overall setup. And then add in the usual mass conjecture that surrounds cam choice (which makes it very hard).

Please advise full list of mods, perhaps compare against setups in the Dyno Threads as well?

[Kenna802]

Mate i have a set of 256 cams and had one of them snap while installing CORRECTLY . I am currently talking to the dealer that said it must of been installed wrong and am waiting on a call back.......If i dont hear from them i wont hesitate to name the cam type and dealer so you can stay clear.

[The Mafia]

Detail the set up.

Cam choice for a stock turbo setup and a T88 setup will differ quite a bit.

[PM-R33]

Mate i have a set of 256 cams and had one of them snap while installing CORRECTLY . I am currently talking to the dealer that said it must of been installed wrong and am waiting on a call back.......If i dont hear from them i wont hesitate to name the cam type and dealer so you can stay clear.

If you were installing them yourself and they snapped I doubt you will get a warranty replacement of any sorts.

Very easy to snap a cam if you bolt them down in the wrong order.

[Kenna802]

A reputable mechanic was doing the job with a print out of the work shop manual so Im pretty sure he was doing it right. i spoke to the supplier and they said that i would have to send them back to the supplier for testing which would take about a month as well as me having to say all postage costs to Japan

[Kenna802]

I meant send the cam back to the manufacturer

[falky929]

Mate i have a set of 256 cams and had one of them snap while installing CORRECTLY . I am currently talking to the dealer that said it must of been installed wrong and am waiting on a call back.......If i dont hear from them i wont hesitate to name the cam type and dealer so you can stay clear.

damn man that sucks wouldnt mind knowing what brand cams they are

[falky929]

Detail the set up.

Cam choice for a stock turbo setup and a T88 setup will differ quite a bit.

mods are garrett 3076 high mount, 1000cc injectors, splitfire coilpacks forward facing pleum, power fc

looking at trying to make 300rwkw and up but keep it as responsive as much as i can

[boostn0199]

Tomei poncams will be perfect for your setup and goals.

[The Mafia]

You're kinda shooting yourself in the foot.

Standard engine safe rpm limit is 7,000rpm. 256 in/ex poncams are good for mid range.

If you start looking at cams for "mid range to top end power" you're going to need bigger ones, but, they will require you to rev the car to 8,000rpm to make full use of them.

Nothing worse than the old "biggest is best" cam choice.

I once was told by someone that was quite oblivious to this, and installed 272 pro cams, lots of lift, on a forged RB25, that had a gt3037 with a 0.63 rear housing.

I had that exact setup (except for the cams) and I can tell you that it's pretty much useless revving it over 6,800 rpm.

So take all of this into consideration.

My advice - maybe a set of 260 or 264 cams. Unless you're planning on Changing to a turbo that makes power past 7,000rpm and an engine safe to do it, any "bigger" cams will be pretty useless.

No point in putting cams in that only assist 2000rpm worth of your rev range.

Make sense?

You can always pull them and sell later for bigger ones of you build something different requiring more agressive cams.

[zebra]

mods are garrett 3076 high mount, 1000cc injectors, splitfire coilpacks forward facing pleum, power fc

looking at trying to make 300rwkw and up but keep it as responsive as much as i can

Standard cams

why spend 1000 bucks on something that isnt needed for 300rwks

if you said 350 than yeah cams will help the 3076 along

[falky929]

You're kinda shooting yourself in the foot.

Standard engine safe rpm limit is 7,000rpm. 256 in/ex poncams are good for mid range.

If you start looking at cams for "mid range to top end power" you're going to need bigger ones, but, they will require you to rev the car to 8,000rpm to make full use of them.

Nothing worse than the old "biggest is best" cam choice.

I once was told by someone that was quite oblivious to this, and installed 272 pro cams, lots of lift, on a forged RB25, that had a gt3037 with a 0.63 rear housing.

I had that exact setup (except for the cams) and I can tell you that it's pretty much useless revving it over 6,800 rpm.

So take all of this into consideration.

My advice - maybe a set of 260 or 264 cams. Unless you're planning on Changing to a turbo that makes power past 7,000rpm and an engine safe to do it, any "bigger" cams will be pretty useless.

No point in putting cams in that only assist 2000rpm worth of your rev range.

Make sense?

You can always pull them and sell later for bigger ones of you build something different requiring more agressive cams.

so ur saying pretty much stick to 256 in/ex poncams or 260 anything bigger will be useless

[falky929]

Standard cams

why spend 1000 bucks on something that isnt needed for 300rwks

if you said 350 than yeah cams will help the 3076 along

i said 300rwkw + just looking at trying to make it as responise as i can.

[zebra]

then I will suggest you go read what larger cams actually do to the airflow of an engine

[Kenna802]

Well the Cams were Tomei , weather or not there was a slight mishap with the cam ill never know, so i ended buying another cam just to get the car running ( cost was 550 ) and it arrived today and found that my cam angle sensor was the wrong type on my car. I than called Triple 9 who is the company only to be told to buy a newer cam angle sensor i than asked him about just swapping my cam which is exactly the same only the end into the sensor is different and than got told " because you bought the cam a little while ago we cant just swap it over but we can look after you buying a new one" What a Pile of Shit! I bought the cam one month ago and its been sitting in the box this whole time. I really cant stress to you all not to do business with Triple 9 .

[StevenCJR31]

maybe a bit off topic but why doesnt anybody opt for reground stock cams? they can be remanufactured to whatever lift and duration that you want and best of all they will fit back into the motor that they came from without CAS hassles as discussed above

[Jap_star]

if you can wait till tuesday my car is being retuned for cams. will have a before and after result from last tune with no poncams. basically same mods as you but no FF plenum.

[falky929]

if you can wait till tuesday my car is being retuned for cams. will have a before and after result from last tune with no poncams. basically same mods as you but no FF plenum.

sounds good mate will be interesting to see the outcome what size cams did u put in?

[Gerg_R31]

Not all standard cams can be ground, but they can be metal sprayed then ground to suit, the trade off to this is its more expensive then buying aftermarket cams

most cams by who ever made them will state their rev range, stock cams will suit lower revs but loose power up top, bigger cams will shift the power band up giving "cam lag" in the lower revs (i.e my cams are suited for 3000rpm to 7000rpm with the rb26/30 i got, in with a 26 bottom end it would be 3500-7500+ but its a massive pig to drive below 30km/h)

bigger cams usually require upgrading of valve springs, retuned air fuel ratios etc, sometimes even changing cam