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Recommend me a turbo/cam setup- RB25

ironmcl

By ironmcl,
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ironmcl Enthusiast

ironmcl

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Recommend me a turbo/cam setup- RB25

Hi all,

I'm hoping someone can save me the money on spending on a new setup that doesn't meet my needs. I've currently got about 330kw with an old garret 3080 0.82 housing through a built RB25 on E85. I'm running 25psi currently and would like to upgrade cams and springs, thinking while I'm there to do turbo, manifold, gates etc.

 

I'm looking for about 450kw give or take, preferably give.. So far im thinking of either a 6466 or a gtx3584rs?

When it comes to cams, I don't mind losing the VCT if its more beneficial to do so. I don't really have a cam selection in mind. Everyone loves that lumpy idle but am unsure of what to get.

 

Currently the car is only used a handful of times a month. Mainly drag use/roll racing with some street driving (not daily driver).

Just looking for advice, maybe from people who have gone down a similar path or someone who can guide me in the right direction.

 

Cheers

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ironmcl Enthusiast

ironmcl

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What housing do you have on the 8374 and what power you making at what psi mate?

 

twin scroll or nah? 

I don't mind the cam noise, car is barely driven. Just after performance if noise is there great if not that's fine too

Griffin Experienced

Griffin

Posted
Posted

I'm fitting a 9174 soon with 1.05 housing. If I was in your position I'd go with a neo engine and 8374. I've used Borg Warner turbos that are essentially s300 airwerks and love them. I did have a neo manual stages years ago with a trust t67 which was ok but poor compared to today's tech.

I'm looking at fitting vcam to rb26 too. I'd definitely keep vct.

If near Newcastle I can take you for a drive to give you an idea.

 

 

ironmcl Enthusiast

ironmcl

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4 hours ago, Scott Black said:

Fwiw a gtx3582r will make the power you want. Your not going to want anything more than just mild drop in cams for that level anyway. However would recommend replacing the valve springs anyway.

Yeah I considered the 3582r. But thought would rather overshoot then upgrade again in 6 months time to be honest.

definetely doing sprints but still uncertain about cams and size 

iTzTMG Contributor

iTzTMG

Posted
Posted

Get a Precision 6466 and Tomei Poncams.
I'm just saying that because that is what I will be using on mine but probably won't get around to fit anytime soon but it would be interesting what results that setup is capable of .
 

Lithium Grand Master

Lithium

Posted
Posted

EFR8374 and Tomei Pon cams.  The EFR8374 is proven time and time again to go >450kws and is responsive as hell for a turbo capable of that, the pon cams retain VCT and the setup should stay perfectly streetable.  A 6466 or a GTX3584RS are both serious overkill.

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ironmcl Enthusiast

ironmcl

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1 hour ago, Lithium said:

EFR8374 and Tomei Pon cams.  The EFR8374 is proven time and time again to go >450kws and is responsive as hell for a turbo capable of that, the pon cams retain VCT and the setup should stay perfectly streetable.  A 6466 or a GTX3584RS are both serious overkill.

Would you be suggesting t4 twin scroll setup with a .80 something housing? 

 

I did originally like the setup idea but seemed like a fair whack of fab work involved to get it all to work and sit in the bay. I could be wrong tho

Edited by ironmcl
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ironmcl Enthusiast

ironmcl

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21 minutes ago, GTSBoy said:

Use this.

http://www.turbos.bwauto.com/aftermarket/matchbot.aspx

 

I had a play around then, tried to not change too much just obviously the must have info. In regards to boost how would I know what to type in for each part of the Rev range?

 

Lithium Grand Master

Lithium

Posted
Posted
30 minutes ago, ironmcl said:

Would you be suggesting t4 twin scroll setup with a .80 something housing? 

 

I did originally like the setup idea but seemed like a fair whack of fab work involved to get it all to work and sit in the bay. I could be wrong tho

1.05a/r twin scroll setup.  I know it sounds big, but trust me on that - it'd be the go.

No matter what you'll be down for a bit of fabrication for that power level, what packaging limitations or preferences do you have?  Are you preferring to stay single entry?   In your position I'd personally be looking at a GTX3582R if single entry was the preferred choice, or EFR8374 if twin scroll was an option.  Both are very potent turbos and ideal for that mid 400kw @ wheels range on E85

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ironmcl Enthusiast

ironmcl

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13 minutes ago, Lithium said:

1.05a/r twin scroll setup.  I know it sounds big, but trust me on that - it'd be the go.

No matter what you'll be down for a bit of fabrication for that power level, what packaging limitations or preferences do you have?  Are you preferring to stay single entry?   In your position I'd personally be looking at a GTX3582R if single entry was the preferred choice, or EFR8374 if twin scroll was an option.  Both are very potent turbos and ideal for that mid 400kw @ wheels range on E85

I'm assuming I couldn't just slap on a 6boost t4 manifold to suit the turbo and housing? The only reason I was considering just doing the single entry was due to less stuffing around. It does make more sense though to do it once and get the better outcome of the twin scroll setup.

Ive read before about the larger housing being more ideal so not doubting you at all.

To be honest I'm not sure how much fab work would be required to get it to work and mainly fit I assume?

 

How much boost do you think the setup would want if you had to have a guess? 

GTSBoy Grand Master

GTSBoy

Posted
Posted
1 hour ago, ironmcl said:

I had a play around then, tried to not change too much just obviously the must have info. In regards to boost how would I know what to type in for each part of the Rev range?

 

You play with the boost at each rev point to get the operating line running through the best efficiency part of the compressor map.  You can't make the boost so high that it goes over the surge line.  You can't make it so low that it falls off the right hand side of the map.  You can't set it so that you need a stupid turbine to run it. It's all a bit of trial and error.  But once you've played with a it a bit, it makes perfect sense.  In fact, watch the Youtube videos put out by BW to get the explicit instructions.  Makes it easy.

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