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Cams? DE or Aftermarket

zforce

By zforce,
in Engines & Forced Induction

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zforce Enthusiast

zforce

Posted
Posted

Hey guys,

I have a RB20DET, and i am looking at upgrading the cams. Now i have been looking at HKS cams, and more specifically 256 duration with 8.8mm lift or the 264 duration with 9.0mm lift.

Now i was wondering if the RB20DE or RB25DE cams have similar profile as these would be significantly cheaper then HKS items, and whether these cams will fit in a RB20DET.

Finally what would be the ideal setup for a street car aiming to make 450hp (fly), the HKS 264 cams or will RB20DE cams do the trick? I am aiming to maximise the response of the turbo, midrange power and if possible make the turbo spool quicker, i am not after peak power ONLY if 250rwkw is hit, otherwise i need a set of cams to help me make 250rwkw.:uh-huh:

My main mods are as follows

3.3" exhaust, FMIC, pod, DSBC, clutch, 2 way diff, PFC. Now i am also looking at a suitable turbo to match (450hp), will a HKS GT2835Pro (internal gate and T3 flange) be best suited for my application or should i be looking at a HKS GT2530 or Garrett GT25 or Garrett GT28 or even a GCG Hi flow 450 hp item (i am after a bolt on item as well, and keep the internals stock)?

Any comments are more then welcome as i would like to hear everyones experiences/opinions.

Thanks!

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Sydneykid Grand Master

Sydneykid

Posted
Posted

Hi zforce, 450 bhp out of an internally standard RB20DET is more than I would think is practicle. The highest output I have seen from an RB20DET was the Gibson GTSR which had 460 bhp for short races and 420 bhp for long races. It was far from standard internally.

To achieve your target you would need a combinatin of more than 1.5 bar of boost and 9,000 rpm. So around 400 bhp (240-250 rwkw) is the most I would be looking for without at least a set of forged pistons.

Moving onto your camshaft question, RB20's run hydraulic lifters, so a HKS 264 camshaft designed for a GTR (which has solid lifters) is not really suitable.

As for turbos, my personal preference is the GCG ball bearing hi flow on a RB25DET turbo. We have one on our R32 GTST circuit race car, another on a R33 GTST road car and another on a R34 GTT road (sometimes drag) car. All work really well, a good all purpose turbo for 200 rwkw up to 250 rwkw.

Second preference would be an HKS2530, we have had 2 of those on the GTR and they were the best all round turbos out several we tried. Just check the quality of it if it's a used one as there are some crappy ones around.

Hope that helps

zforce Enthusiast

zforce

Posted
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Posted

Thanks SydneyKid,

I was just unsure whether 400hp would make 250rwkw, but now i know it does, so ill set my target a bit lower.

In regards to the cams, so HKS 264 cams are out of the question? What would you suggest then? HKS 256 or RB20DE or RB25DE cams?

With the turbo, i have heard some many different stories i am more lost now then when i first learnt what a turbo is! I have heard that the HKS GT2530 wont make 250rwkw, and some people say it will. Some say GCG turbos are not as responsive as HKS items. Others say the HKS GT2835 will be the best suited turbo as it isnt that much laggier then a 2530 but offers alot more power. So i dont know what to believe.

My goal is 250rwkw, using stock internals and have it as responsive as possible. Any suggestions on what turbo to use?

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