rb25/30 conversion

[jokerpfl]

hi guys im new to the 4x4 scene but absolutely love it. just need some advice on a conversion im doing..?
i have a gq swb patrol and i am doing a rb30 block with rb25 head and cam conversion. the block and heads getting machined bored and balanced atm with forged pistons on its way. my question is what kind of turbo would you recommend with this setup???

[nissannewby]

That's a very open question mate.

What sort of power are you looking at?
What sort of boost are you wanting to run?
Intercooled?
What is the vehicle going to be used for?

There are many options available for the RB series motors. Also maybe a skyline or VL commodore based forum could be a lot of help also.

[jokerpfl]

sorry im still new to it all but im looking at making about 300 hp and i just want to tear up the dirt and climb up dunes but also be able to smoke it up on road...
:)
is this possible???

[jokerpfl]

yeah i want to run intercooled, external waste gate, i already have the front plenum intake

[04OFF]

Sounds like it will be fun if you can get it all done. :wink:



Why did you decide on doing a 25 head conversion ?, a RB30 single cam would do everything you want it to do !

You are fitting aftermarket pistons, and your fitting a machined 25 head, have you worked out what compression ratio you will end up with ?

With your forward plenum, is it to suit a XF Throttle body or standard (or other) and are you going aftermarket ECU ?.

And are you talking 300hp @ flywheel or tyres, and are you using a auto or manual gearbox ?


What is your budget ?




Im afarid choosing a Turbo is not always that simple ,if you want the right Turbo, there are a thousand questions that need to be answered first, can you talk to the engineer about these things , perhaps he can explain things and help you to get what you want/need rather than us "guessing" ?

[Alitis007]

Most of these RB28 hybrids ( 30 block / 25 head ) run T3/T4 in VL's. When i was doing a turbo conversion on my vl i had the option of having that combo, just the standard rb25 head with a small port and polish on the rb30 block with 30 thou oversize pistons was a 800 hp combo with the correct cams ( sorry can't remember which cams i was recommended to get) . You could also run a T04z but it will be a little bit laggier than the T3/T4.

[04OFF]

Cool !, sounds like he just needs a T3/T4 then, and he will have easy 800hp ! :clownredpuff:

[jokerpfl]

someone actually recommended using a garret gtx 3076 is that bigger than the t3/t4 i think im still gonna be using stock cams from the rb25

[jokerpfl]

i think my mechanic said he was waiting for all the porting and that to be done by engineer and getting all the compression ratio and all that from him first but i am impatient lol and wanted to get turbo and all that ready so when the block and that comes back its ready to be put together.

but also a guy from c-red in perth said that any more than 300 hp and i prob be blowin gearboxes and stuff but he said at 300 i will have a fun reliable every day car... any different views on this would be much appreciated??

[jokerpfl]

plus would also like anyones opinion on an aftermarket computer to use toooo im such a newb so sorry if these questions are a bit how should i put it "dumb questions" its prob common knowledge for most of you all lol...

[nissannewby]

Cool !, sounds like he just needs a T3/T4 then, and he will have easy 800hp ! :clownredpuff:

On a stick bottom end too. Cheap and easy :).

The 3076 would be a good option with a .6 or .7 rear that should net your 300 and be fairly drive able on road.

[Alitis007]

Cool !, sounds like he just needs a T3/T4 then, and he will have easy 800hp ! :clownredpuff:

Sorry i should have clearly said the head and block combo i was quoted for by my machinist was rated for 800hp

[Alitis007]

On a stick bottom end too. Cheap and easy :).

The 3076 would be a good option with a .6 or .7 rear that should net your 300 and be fairly drive able on road.
dont underestimate a na rb30 bottom end mate


plus would also like anyones opinion on an aftermarket computer to use toooo im such a newb so sorry if these questions are a bit how should i put it "dumb questions" its prob common knowledge for most of you all lol...

This should answer most of your questions mate, you could watch the full clip or just forward to the 5:50 min mark
http://youtu.be/TcnEz8Eru7U

[jokerpfl]

Thanx for the vid alitis007 that def was helpful but how loose is that dude hahaha

[Alitis007]

Thanx for the vid alitis007 that def was helpful but how loose is that dude hahaha

No dramas mate and yeah he's a character and an a half lol

[BigRAWesty]

dont underestimate a na rb30 bottom end mate



This should answer most of your questions mate, you could watch the full clip or just forward to the 5:50 min mark
http://youtu.be/TcnEz8Eru7U

Bloody nuts.. And what a card..

[Alitis007]

Bloody nuts.. And what a card..

It reminds me of a lot shed builds my mates and i used to do in $500 vl's and r31 skylines with a budget of sweet eff all lol

[nissannewby]

dont underestimate a na rb30 bottom end mate

Im not, but they do have limitatons like everything. Wanting to keep a rb reliable with a stock bottom end I wouldn't be exceeding 400hp at the treads.

An RB30 in a patrol has a lot more strain on it than that of one in a skyline or VL. Larger tyres, much larger diffs and drive train losses and about 1 tonne of extra weight to push around.

The OP goals are realisitic goal (at 300hp) and will be a very usable figure for a patrol. Research is key here though as the setup will be a little different to that of a street car. A build like this should be well thought out and built accordingly. There is a vast difference between something that is built and something that has just got bolt on add ons. Im not claiming to know a lot about these motors but time taken now will see you very satisfied.

[taslucas]

There was an article on a rb30 GQ in a 4wd action mag about 2 years ago. Sorry I can't remember much other than it was black lol. It may have had a big "mannel motors" sticker down the side. It ran two computers so could be switched between full power or a bit more economy mode. It had something like 220kw at the wheels on 37s........

[nissannewby]

There was an article on a rb30 GQ in a 4wd action mag about 2 years ago. Sorry I can't remember much other than it was black lol. It may have had a big "mannel motors" sticker down the side. It ran two computers so could be switched between full power or a bit more economy mode. It had something like 220kw at the wheels on 37s........

Yeah it was in a shorty. The lower tune gave him 285hp at wheels (210kw). I think on the higher tune it would do about 330hp or so.

[taslucas]

Yeah it was in a shorty. The lower tune gave him 285hp at wheels (210kw). I think on the higher tune it would do about 330hp or so.

I was pretty sure it was a wagon but that sounds like the one

[taslucas]

There was an article on a rb30 GQ in a 4wd action mag about 2 years ago. Sorry I can't remember much other than it was black lol. It may have had a big "mannel motors" sticker down the side. It ran two computers so could be switched between full power or a bit more economy mode. It had something like 220kw at the wheels on 37s........

Here's the article:
http://www.4wdaction.com.au/articles/2010/black-magic

[Alitis007]

Im not, but they do have limitatons like everything. Wanting to keep a rb reliable with a stock bottom end I wouldn't be exceeding 400hp at the treads.

An RB30 in a patrol has a lot more strain on it than that of one in a skyline or VL. Larger tyres, much larger diffs and drive train losses and about 1 tonne of extra weight to push around.

The OP goals are realisitic goal (at 300hp) and will be a very usable figure for a patrol. Research is key here though as the setup will be a little different to that of a street car. A build like this should be well thought out and built accordingly. There is a vast difference between something that is built and something that has just got bolt on add ons. Im not claiming to know a lot about these motors but time taken now will see you very satisfied.

The op did say he was doing the bottom end and i never said to him to leave the block high comp but its been done and have it seen first hand.

Your right about researching tho and thats why the op has asked the question here and i gave hime an answer from my experience.

My comment was to you and not the op's post lol

[jokerpfl]

I think im goin to go wit the gtx3071r with the tial 0.63 housing haltech ps2000 ecu and maybe either a tial 38mm or turbosmart 38mm wastegate. anyone know which wastegate is better. and what ya reckon about the setup??

[Alitis007]

I think im goin to go wit the gtx3071r with the tial 0.63 housing haltech ps2000 ecu and maybe either a tial 38mm or turbosmart 38mm wastegate. anyone know which wastegate is better. and what ya reckon about the setup??

What i know about the GTX style turbos is that the compressor wheel has been re designed to spool up faster and produced more stable boost. I've heard good things about the tial wastegate but saying that most of older tuners use them coz they have been around for a while, personally i have a 38mm turbosmart pro gate which i have yet to fit up to my toy but from memory flowed more that the tial and was a bit more compact. From experience i had a Malpassi FPR that couldn't cope with my fuel system but soon as i fitted up the Turbosmart unit i haven't had any problems since plus they're aussie made.

With your ECU i've had friends using Haltech's any they have been happy but i have played around with the Apexi power fc in my brothers r32 gtr and straight out of the box the have a couple of good base maps to run the motor before you get a full matrix style tune for it. If your looking for a factory performance tuned ECU for EPA Reasons keep an eye out for a Nismo Mines ECU, they have different fuel trim maps from the standard with deleted fuel cut off speed limiter and the 12psi boost cut off that the standard ecu has.

[jokerpfl]

Yeah I prob gonna go with an aftermarket ecu straight out cause if I get bored with the trol which I doubt would be ever but then I want to create a sick drifter so I wont have to purchase one later you know what I mean so u recommend going with the turbo smart wastegate but I found a tial 38mm with screamer pipe in gumtree for 250 wat u think

[Alitis007]

Yeah I prob gonna go with an aftermarket ecu straight out cause if I get bored with the trol which I doubt would be ever but then I want to create a sick drifter so I wont have to purchase one later you know what I mean so u recommend going with the turbo smart wastegate but I found a tial 38mm with screamer pipe in gumtree for 250 wat u think

If you want a cheap drift car just get a S13 and fit a stock rb20det in it, i've had mine skating at 140km/h lol ( thats not my toy tho :) ) the wastegate i recommend you go new coz if it faulty you will loose your money if it second hand. Personally i don't like screamer pipes coz it sounds like a big air leak and i would have it plumbed back into the zorst for 2 reasons, 1 i don't want flames under my car to light up say a oil leak, and 2 you could start a fire when your offrd. So its really up to you tho which way you want to go

[jokerpfl]

Yeah true that... ty. Hey I just bought a gtx3071r with the tial dual vband housing what kind of exhaust manifold should I be looking for is it t3 or t4 flanged ones I really dont get this turbo stuff its doing my head in

[jokerpfl]

But the guy at sonic performance reckons the turbo doesnt come with t3 or t4 flange I dont know

[jokerpfl]

does anyone know where i can get an rb25 exhaust manifold with wastegate outlet with a vband flange for the turbo and wastegate

[93patrol]

rb25 exhaust manifold with wastegate outlet with a vband flange for the turbo and wastegate


copy and paste that^^^^ into google and you'll get a really good response to some places like Alibaba.com and the like

[nissannewby]

But the guy at sonic performance reckons the turbo doesnt come with t3 or t4 flange I dont know

They certainly do. I fitted a gtx3071 with a t3 flange not long ago. Have a look at atpturbo.com heaps on there mate and really good prices. Most stuff is delivered in less than 7 days.

[jokerpfl]

but my gtx3071r didnt come with a t3 flange

[jokerpfl]

also would anyone know why they would take the specs plate off my gtx3071r with tial housing you think they did it cause the turbine housing is not a genuine garret???