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Tomei 270cams

BlueRB240

By BlueRB240,
in Engines & Forced Induction

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Steve Grand Master

Steve

Posted
Posted

I think the redline you want to be running will have more bearing on upgrading the springs, as the stock lift for RB20DET is 7.8mm, so 8.5 isnt a huge increase (RB26 use just over 8.5mm lift).

EDIT: just had a look at the link, as the cams are made for hydrualic lifters, you should be fine as long as you keep the redline sane. I have heard it recommended by the co-owner of Signal (owner's brother) that the RB20DET should not be taken past 8200redline in stock form, with possibly more agressive ramp from the Tomei cams, perhaps even that is a bit too high?

Out of interest, why are you going 270?

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BlueRB240 Collaborator

BlueRB240

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I think the redline you want to be running will have more bearing on upgrading the springs, as the stock lift for RB20DET is 7.8mm, so 8.5 isnt a huge increase (RB26 use just over 8.5mm lift).

EDIT: just had a look at the link, as the cams are made for hydrualic lifters, you should be fine as long as you keep the redline sane.  I have heard it recommended by the co-owner of Signal (owner's brother) that the RB20DET should not be taken past 8200redline in stock form, with possibly more agressive ramp from the Tomei cams, perhaps even that is a bit too high?  

Out of interest, why are you going 270?

I'm goin to be installing a big turbo like a 62-1,60-1 something around that line. I'm more intrested in moving the power band to the higher rpm since it's a 2.0 any way.

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Sydneykid Grand Master

Sydneykid

Posted
Posted

Hi BlueRB240, I agree with Steve, RB20DET valve springs are getting on a bit now. I would upgrade them, which you can do without removing the head. I haven't personally tried it, but I understand that RB26DETT valve springs fit. They could be a relatively easy and cheap upgrade.

Hope that helps

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BlueRB240 Collaborator

BlueRB240

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Hi BlueRB240, I agree with Steve, RB20DET valve springs are getting on a bit now.  I would upgrade them, which you can do without removing the head. I haven't personally tried it, but I understand that RB26DETT valve springs fit.  They could be a relatively easy and cheap upgrade.

Hope that helps

Thanks for the info guys.

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zforce Enthusiast

zforce

Posted
Posted

So what would be a good setup with a stock RB20DET, i.e. what lift, duration would you use (what cams, i was thinking HKS step 1 264 for both in and out) and would it be necessary to upgrade the valve springs with these cams? Can you go to step 2 on stock valve springs (i didnt think it was advisable)

Also why do some people use 256 in and 264 out?

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Cubes Grand Master

Cubes

Posted
Posted

The smaller inlet cam duration gives you that little bit more bottom end torque without affecting the top end to much.

Maybe some thing is wrong with mine as I'd hate to be taking off from a set of lights with the AC on a 30+degree day with a set of large cams in the RB20DET.

Is it mine or are all RB20DET's as gutless as hell until they get a bit of boost in to them?

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Sydneykid Grand Master

Sydneykid

Posted
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Hi Joel, it's just your car. Well, maybe how it is set up and tuned, we run a lot of ignition timing, split dump, electric fan, balance the injectors and spend a fair bit of time tuning our RB20DET off boost and at partial throttle openings with a Power FC. Doing those things I achieved a 100% increase in power at 2,000 rpm. Most tuners go for the highest maximum horsepower and worry only a little bit about average power over the boosted rpm range. And care even less about off boost performance.

Lighter flywheel and road wheels makes a goodly difference as well.

Hope that helps

Merry Xmas

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BlueRB240 Collaborator

BlueRB240

Posted
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Posted
Hi Joel, it's just your car.  Well, maybe how it is set up and tuned, we run a lot of ignition timing, split dump, electric fan, balance the injectors and spend a fair bit of time tuning our RB20DET off boost and at partial throttle openings with a Power FC.  Doing those things I achieved a 100% increase in power at 2,000 rpm.  Most tuners go for the highest maximum horsepower and worry only a little bit about average power over the boosted rpm range.  And care even less about off boost performance.

Lighter flywheel and road wheels makes a goodly difference as well.

Hope that helps

Merry Xmas

PowerFC for the RB20? Where can I get one? I'm still waiting for my friend from Apexi (USA) to let me know if they make it or is it someone else? still haven't got any word.

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Merli Grand Master

Merli

Posted
Posted
I have been waiting to see if they got the RB25,20 out but still nothing yet. :( looks like it's a commander I'll be using.

Oh.......

Doesn't everyone have an RB26??? ;):D

Just kidding mate :D... Best way to get them to make an RB25 one is to get lots of people emailing them requesting one!!!

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