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RB25 Drift Build Question's / Advice.

elleskyline
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elleskyline Enthusiast

elleskyline

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Posted

RB25 Drift Build Question's / Advice.

Chasing some basic advice for the finishing touches and general opinions on my RB25dett build, this motor will be primarily used for drifting and run on e85.

The build so far...
Block bored and honed
CP pistons
Eagle rods
ARP head bolts
ACL race bearings
1000cc bosh injectors
N1 oil pump
Upgraded water pump
Gates timing belt
Fuel rail 
Custom forward facing plenum
High mount steam pipe manifold
Pierburg external fuel pump, walbro in tank pump + surge tank
Trust fmic
Alloy rad

Turbo
I am unsure of the best turbo to run for my application. I do have a Garret gt3582R + external gate, which I got second hand, but has too much shaft play. I have been quoted upward of 1k for a full rebuild from MTQ Engine Systems. Should I repair it and run it, or get something more compatible? What should I be looking for? 

Obviously for drifting I want fast repsonse and not a lag monster, I am not chasing huge numbers from this build, reliability and good repsonse is the goal. 

ECU
Motec M8

External Head drains
I have heard really conflicted things about external head drains. Are they worth it and effective? I was looking at grabbing the Spool kit? And I will be running a catch can.

Should I run an oil cooler?

This is my first 25 build so be kind, I am only a grasshopper. Any valuable input appreciated. 
 

IMG_20160911_180935.jpg

IMG_20160425_121801.jpg

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https://www.sau.com.au/forums/topic/467203-rb25-drift-build-questions-advice/
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bcozican Experienced

bcozican

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Posted (edited)

its like anything, you set your power goals and go from there....    also what tracks youre going to run and diff ratio

but in essence that turbo will be too big for most drifting - gtx3076 with 0.82 rear housing is what I used all through my drifting and is the most common used over here for people wanting between 450hp to 500hp on 16psi - 20 psi respectively ...full boost about 3800 - 4K depending on a few things + tune etc

think about your long term goals ie: will you want more in the future

I think the gtx3071 (or similar size)  with 0.82 on 20psi which should give you about 475rwhp and better response if you are 1) new to drifting 2) have smaller tighter tracks  3) not competing at ADGP level

I had rear head drain in one of my engines, didn't do anything for me... but I ran my breathers out of the rocker covers to my catch can and that drained back to the sump... that is a saver for sure (also many opinions on this)

 

All things come  down to money etc but yes if you have the coin .....   pu tan oil cooler in and also a power steering cooler

 

Edited by bcozican
KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

Have you still got the original turbo? Not sure where you are but I would consider trading it in with Hypergear I am sure he can supply you with a turbo suitable for your purposes.

External head drains will do nothing for you. Read say the last half of this thread:

Mainly you need oil restrictors and sump breathers. Motec are top of the line and top dollar. I am sure a Link or a Haltech will do what you want. And yes an oil cooler in the power steering line would be good. Nice trailer by the way...

Komdotkom Rising Star

Komdotkom

Posted
Posted

Do you have a Motec M8 or that's what you are looking at?

The M8's are pretty damn old now (circa 1990) and aren't really supported by Motec, a mate of mine has one in an old Sports Sedan and it's a pain in the backside. You'd be much better off with a Haltech Elite or a Link.

I've got a Motec system on mine (M600+PDM+CDL3) but if I had my time again I would go with a Haltech becuase of their superior support for club level/budget motorsport. Motec are fine if you have cubic dollars, but for the sort of car you have it's overkill. 

If you currently have an M8, I'd sell it. You'll probably get $1400 ish for it depending on the options enabled, this will cover a lot of the expense of a newer ECU.

  • Like 1
Jordy32 Experienced

Jordy32

Posted
Posted

My suggestion would be to sell off the high mount manifold and run a stock manifold with a hypergear turbo, all the other parts look pretty normal for a solid RB25.

If you are planning on running the car hard (drifting, so yes) I would certianly suggest an oil cooler. Doesn't need to be huge, but make sure it's new and of good quality.

As suggested, read through the Oil Control thread and ask any questions you may have as oil control is crucial to an Rb build.

Good luck!
 

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