Jump to content
SAU Community

Recommended Posts

Cams in RB25DET, R34 GTT

Hey Guys.

Just had the cams fitted, tuned and the like.

They're Tomei Poncams B, 260 duration, 9.15 lift.g

Made no extra power, all it did was drop the power through 95% of the power band by about 10kW, cost me three hours of my life, and money for the Cams, Install and tune.

Bottom line, don’t do it.

However, we did play with the adj cam gear on the exhaust cam, at 4 degrees retard, was too close to the edge, 2 degree advance, dropped 30 kw, at 2 degrees retard made reasonable power.

I have a straighter graph, not as much of a fat curve as before.

Bigger drop in torque at the 3500 to 4500 range than before.

All in all, a disappointing experience.

BUT, when the turbo goes on, we expect to make much better power than with stock cams.

Graphs to come.

BASS OUT

Link to comment
https://www.sau.com.au/forums/topic/75475-just-fitted-tomei-poncams-in-rb25det/
Share on other sites

  • Replies 50
  • Created
  • Last Reply

Top Posters In This Topic

Cams, $840 delivered

Fitting including major service, cam belt, water pump etc. $1200

Tune $300

Therefore, about $2340 wasted, but I needed the service anyway, so I guess only $1240 wasted.....

But when the high flow goes on, maybe not wasted.

BUMMER BASS!

Hope you pick it up with the new turbo but once lost, can it be regained on top of what the turbo will do anyway?

Hope I dont have as bad experience whith my GTR cams for my RB20 soon.

Fingers crossed!

the NEO must have better airflow than the 33 RB25... I had the 256's installed and whilst there was no power gain it was noticably smoother (better curve) and it made power all the way to redline instead of dropping off... nicer exhaust note too

oh and it made the same power at .1bar less

so yeah I have no answers just more questions... SK what say thee

ps. definately not a bang for buck mod

Bass Junky,

You over cammed the motor since you only have a stock turbo. Like you said the high flow will like those cams however. GTR's are a different story due to the larger flow on the twin turbos.

On my old R33 gtst I ran a standard inlet cam with a larger duration and lift exhaust cam. There was an improvement through the power band. I did my selection based on advice from someone who does camshafts for a living.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • Yep, it was only an option on the Q50 Hybrid.  Same in Japan as far as I know. And doesn't use a centre diff like the Suby's do, so not the same as the WRX.  But it also isn't a reactive AWD like other Nissan AWD vehicles are, eg. Murano/Xtrail/etc.
    • You should have got a Maine Coone then. Only thing is they're big. But so cool, and just like a dog. Or, just get yourself a high performance dog. That'll teach you for wanting Parkour indoors 😛
    • Are you thinking of Bens R32? I don't remember if his went through the bonnet itself, but it went through the chassis rail. Brad (RISKIN) bought it, and turned it into a track car. It's funny how anti people are of Jim Berry now. I remember when I pulled mine out (during an engine change) and inspected it and found it cracking badly. At that point in time so many people were even on SAU, were so pro Jim Berry, and that was after Bens GTR exploded his quite publically.
    • That's one of the reasons I got that breed, they look weird, the other reasons are they small, they are very vocal, and run around like they are on crack, I didn't want a breed that just sits around, these two are like kids on red cordial  My daughter has one, and it's a laugh riot, constantly doing Parkour around the house, sits on her shoulder, plays catch, and constantly runs around the house taking turns chasing the dog around, her Bermese though, just lays around with constant bitch face, and just looks on in utter disgust at the cat and dog playing together 
    • I'm getting PTSD flashbacks seeing that name again.  With my turbo swift, I got 1,500km of street use on a Jim Berry clutch before it exploded and took out my input shaft with it. 
×
×
  • Create New...