Just fitted Tomei Poncams in RB25DET

[Bass Junky]

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

[JaFF]

how much it cost you all up then? not much bang for buck on a RB25.

[Bass Junky]

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.

[JaFF]

ouch. goodluck when you get ur new turbo

[Robo's]

Who raved on about them when yours didnt respond to the Pons?

[Abo Bob]

I guess it needs the bigger boost to make it worthwhile then. Interesting. Thanks for being a guinea pig Bass.

[Bass Junky]

Can somebody please buy me some food.

I'm broke and slow.

[Bass Junky]

OH yeah,

Heap's deeper exhaust note now though!!

[Bass Junky]

And a lump idle.

[CerealKiller]

And a lump idle.

lumpy idle > *

Maybe SK can shed some light. I've always been under the impression that Tomei Poncams are a good way to get power through the whole power band.

[Bass Junky]

Starwars "Sk please help, you're my only hope"

[JH32]

Starwars   "Sk please help, you're my only hope"

maybe he'll sense you

[GTRgeoff]

Pete sorry to hear it. I have heard the standard sticks in the Neo are pretty good though.

[TurboX]

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!

[Abo Bob]

It'll sound even better with the highflow. I'm surprised you bothered with adjustable pulleys though.

[Bass Junky]

Already had the adj pulley on the exhaust cam anyway.

[fresh]

aren't the poncams designd for a turbo which is bigger anywasy, hence more airflow etc.....

hence wouldn't theu benefit from this rather then improving stocko setups

[NickR33]

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

[rev210]

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.

[GTRgeoff]

I recall Sydneykid saying they were a waste on the Neo....but I expect worthwhile with a highflow.