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272 Cams Ported Head -7 Turbos Rb26

r14

By r14,
in Engines & Forced Induction

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r14 Collaborator

r14

Posted
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as description says ive got a set of greddy 272 degrees cams 9 1/2 mm lift and 550cc injectors - 7 turbos dumps etc ..can any one tell me are these cams to big for theses turbos?? and what kind of power should i get out of this combo in a rb26 or what would work??

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GTScotT Grand Master

GTScotT

Posted
Posted

Consider they are the OEM item for a fairly well tuned OEM motor (R34 n1). Going to an enormous cam would be futile in a search for gains.

Consider again that they are well within the motors factory scope and a cost benefit analysis will begin to form.

Ultimately when wouldn't a ported head and the right cams be good? I say if your really serious about maxing out what you've got you should look harder at step 1 based cams and relax on the dreams of expensive port jobs. Be it myself I would run a set of gears as it seems the forum has proved they are a bang for buck performer.

step 1 cam size can be seen as 25x or milder 26x variants.. GL

MrStabby Grand Master

MrStabby

Posted
Posted

Sell cams, buy cam gears and save the difference. Or if the cash is burning a hole in your pocket post details of your setup and we'll suggest something much more useful to spend it on.

r14 Collaborator

r14

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well what i have got a the moment is the cams ported head 550cc injectors new r33 cranck stock rods, n1 piston 1mm o/s. cam gears n1 oil pump -7 turbos .arp bolts .. this engine was a stillway built engine but when i pulled it done every thing was stuffed and it was running a t88 turbo.. any ideas on what would be a good combo for these -7 turbos ...and would any one want to buy these greddy 272 degrees cams???

N1GTR Grand Master

N1GTR

Posted
Posted

Dyno, I've also driven both cars on the street afterwards.

Both got to within 4rwkw of each other at 8000rpm (both around 305rwkw), the one with tomei cams is all over the OEM cam'd one until about 5500/6000rpm (from memory, may be slightly less, i dont have the dyno sheet here) where they are then dead even until redline.

R.3.2.G.T.R Grand Master

R.3.2.G.T.R

Posted
Posted

Dyno, I've also driven both cars on the street afterwards.

Both got to within 4rwkw of each other at 8000rpm (both around 305rwkw), the one with tomei cams is all over the OEM cam'd one until about 5500/6000rpm (from memory, may be slightly less, i dont have the dyno sheet here) where they are then dead even until redline.

very interesting.. finally someone with real results for poncam b on GTR, I've been on the fence as most say it's not worth the money vs result and stock works well

were they dialled in or left at zero?

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