Worth Changing Cams?

[luvpsi]

is it worth changing my cams on my r33 with the vct or should i jus leavethem alone and just get a adjustable cam gear for exhaust

[KiwiRS4T]

Depends what you want to acheive and on what mods you have done already. If you want more power up the boost. Poncams are said to run nicely on the Rb25DET but I'd rather spend the money on a new turbo. If you don't go for the cams an adjustable exhaust cam gear will give a small midrange improvement.

[ClutchBurndout-:(]

on a different note, you say you can improve midrange by adjusting the cam gears on an rb25? would this stop R&R on a standard turbo setup? i have mega R&R in midrange on anything above 7psi, would altering the cam gears help this? or just make it more R&R?

[R31Nismoid]

Wont change R&R

[bozodos]

Kind of interested about this also, given the reletive ease of swapping them out, are small Poncams worth it?

[zebra]

The short answer is no.

Unless you have a fairly big turbo GT3076 and up they dont make much difference.

I remember a few years ago on here, a bloke put some Tomei poncams in his Stock turboed 34 GT-T and lost power everywhere in the rev range, even after It was tuned to within an inch of its life.

Roy also went backwards changing to Apexi cams in his angry RB20

[PM-R33]

Neos behave differently to Poncams than your RB25DET.

I got good results with mine. But like others have said, money is better spent else where first.

[simpletool]

Simply not worth it. For the cost of cams installed you could have a nistune with better gains everywhere. Boggles the mind.

[PM-R33]

He hasn't really stated what mods he has, has he?

[wolverine]

The short answer is no.

Unless you have a fairly big turbo GT3076 and up they dont make much difference.

I remember a few years ago on here, a bloke put some Tomei poncams in his Stock turboed 34 GT-T and lost power everywhere in the rev range, even after It was tuned to within an inch of its life.

Roy also went backwards changing to Apexi cams in his angry RB20

Are you referring to Bass Junky? Pretty sure he had poncams and got good results but got nowhere with adjusting cam gears.

[bozodos]

I meant with an uprated turbo lol, just one of those things since I'm also looking at doing a 100k service soon, so will have most of that stuff off anyway, I eventually plan to have a 3071/GTRS anyway.

[75coupe]

so if running gtrs, gt2835, 3071 or 3076 kinda sized turbo on a rb25..

where in the power curve would the most difference be?

and how much difference?

[PM-R33]

Mine is kind of hard to judge because I did the headwork at the same time.

But my biggest gains were from around 2000rpm to 5000rpm at around an average of 20-30rwkw.

[Deano 1]

it all comes down to what setup you are running, if its just a low budget build than theres no point in wasting money on cams, theres better places to put it.

[75coupe]

what do we call low budget???

[chuckie]

The short answer is no.

Unless you have a fairly big turbo GT3076 and up they dont make much difference.

I remember a few years ago on here, a bloke put some Tomei poncams in his Stock turboed 34 GT-T and lost power everywhere in the rev range, even after It was tuned to within an inch of its life.

Roy also went backwards changing to Apexi cams in his angry RB20

Hi But he`s has 33 head not a Neo ,so can`t compair them,

for me keep stock get adj cam gear,

then save if you want CAM UPGRADE,

learn to handle what you have & then think what`s next.

Cheer`s Chuckie.

[boostn0199]

It depends what you have done so far. If youve done pretty much all the bolt on stuff and are looking for the next engine mod than yes the poncams are a good option. Thats what I did got all bolt on stuff done now going for some poncams and exhuast cam gear. But yeah as others said if you havent done the stage 1 bolt ons I wouldn't think its a good idea to do them.

[zebra]

Considering that you can get a genuine 500rwhp with standard RB25 cams, I dont think it is worth it at all unless you want more than that.

As for the Neo vs R33 setup, the ports are the same, valve sizes are very similar if not the same, only advantage between say a 256deg 8.5mm lift cam for the Neo would be slightly more agressive ramp rates on the lobes, and thats if Tomei even bothered to do that.

[PM-R33]

It aint about peak horsepower though. It is about gaining more power in the midrange which is extremely hard to do on a setup allready pushed to its limit.

[boostn0199]

It aint about peak horsepower though. It is about gaining more power in the midrange which is extremely hard to do on a setup allready pushed to its limit.

Yeah thats my main reason for opting for a set of cams Im not concerned about peak so much, so once again it depends what you want and are aiming for.