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My Rb30det Into Gts4 Build

sky30

By sky30,
in South Australia

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Cubes Grand Master

Cubes

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Posted

Comparing my old Rb20DET pump and the RB25DET pump I run on mine the RB25DET pump had the same amount of lumps but the gear was thicker so it would flow more.

My Rb30 block cam with 2 x 1.8mm restrictors.

I believe the Rb25DET's run 2 x 1.5mm restrictors and the RB26 1 x 2mm restrictor.

I'd stick with 1.5 its safe.

Have you thrown a crank collar on to it so you can rev it a little harder without the worry?

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Cubes Grand Master

Cubes

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I noticed mine runs a little more pressure up over 3000rpm.

Yours I remember was a bee's dick over 4 on the stock guage where as mines up around 5 at 3000rpm.

4k and over mines sitting on 6.5-7. :S

A little high. :S

When cold with anything thicker than 5w40 it max's out the guage over 8. With 5w40 it sits smack on or just under depending how warm the weather is.

Its probably a sticky relief. :S

My old rb20det with its stock pump never say over a bee's dick over 4 when warm.

sky30 Mentor

sky30

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Joel, OK i will grab that restricor off you and throw it in. I havent used a crank collar as its still my stock RB30 bottom end and i wont be reving it heaps high due to stock rods, i wont get a collar till i built a forged bottom end, i got h beam rods just need some pistons.

What revs you reckon safe with std crank oil pump drive?

Cubes Grand Master

Cubes

Posted
Posted

argg what rev's....

I really don't know as I haven't done a motor in 'yet' and to be honest there's no real solid proof of what rev's does what.

It probably eventuates from poor rebuilds. In your case thats not a problem as you know the motors solid.

Hows the condition of the current oil pumps gear drive? They tend to wear and flatten the metal.

A shade before 7.5k?

Thats quite a bit of rev's anyway, ~60km/h in first, ~105km/h in second and ~145-150km/h in third.

Shaun rev'd Antony's quite hard, well over 7k but it the valve springs hated it so the rev limit is set to 7.2k.

When/how do you want to grab this restrictor?

mr_rbman Grand Master

mr_rbman

Posted
Posted
argg what rev's....

I really don't know as I haven't done a motor in 'yet' and to be honest there's no real solid proof of what rev's does what.

It probably eventuates from poor rebuilds. In your case thats not a problem as you know the motors solid.

Hows the condition of the current oil pumps gear drive? They tend to wear and flatten the metal.

A shade before 7.5k?

Thats quite a bit of rev's anyway, ~60km/h in first, ~105km/h in second and ~145-150km/h in third.

Shaun rev'd Antony's quite hard, well over 7k but it the valve springs hated it so the rev limit is set to 7.2k.

When/how do you want to grab this restrictor?

when he brings my cams to adelaide, hehe!

  • 1 month later...
sky30 Mentor

sky30

Posted
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Posted (edited)

I finally got my engine going and tuned yesterday, made 382rwkw on only 17.5psi boost. Had issues with boost control, if i tried to boost it over 17 psi it would just go crazy and make 25+psi, tried a few different ways using top and bottom port on the wastegate, but had same problem each way. Im currently running a 10psi spring, i will try the 15psi spring i have.

Ill scan the graph and post up later.

Edited by sky30
Cubes Grand Master

Cubes

Posted
Posted

holy moley...

Damn nice result Andrew. I bet that plasted a grin from ear to ear the first time you gave it a lot. :rofl:

So whats different to the old setup?

382rwkw on the gt35/40 .82? Shiet. :rofl: Quite an improvement over the stock inlet and exh. setup.

Did the restrictor make it to you in time to be fitted up?

sky30 Mentor

sky30

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holy moley...

Damn nice result Andrew. I bet that plasted a grin from ear to ear the first time you gave it a lot. :rofl:

So whats different to the old setup?

382rwkw on the gt35/40 .82? Shiet. :rofl: Quite an improvement over the stock inlet and exh. setup.

Did the restrictor make it to you in time to be fitted up?

Yeah, it takes off so much beter than the 2WD.

New setup is has Better cams, better plenum, better exhaust manifold. I hope to sort the boost out soon to run around 20psi and get a bit more out of it, need to build my bottom end now so i can rev the thing, power still going up at 7000rpm limiter.

GTROB Collaborator

GTROB

Posted
Posted
I finally got my engine going and tuned yesterday, made 382rwkw on only 17.5psi boost. Had issues with boost control, if i tried to boost it over 17 psi it would just go crazy and make 25+psi, tried a few different ways using top and bottom port on the wastegate, but had same problem each way. Im currently running a 10psi spring, i will try the 15psi spring i have.

Ill scan the graph and post up later.

Nice work Carlos. Sorry I didn't catch up with ya had to go back to work. In NZ at the mo will be home in the next week or 2 will come and have a look at it then

Cubes Grand Master

Cubes

Posted
Posted
Yeah, it takes off so much beter than the 2WD.

New setup is has Better cams, better plenum, better exhaust manifold. I hope to sort the boost out soon to run around 20psi and get a bit more out of it, need to build my bottom end now so i can rev the thing, power still going up at 7000rpm limiter.

Nice.. So you say better.. You mean still stock gtr plenum and stock gtr cams but better than the rb25 shiet? :rofl:

Quite impressed with the result. Excellent.

GTROB Collaborator

GTROB

Posted
Posted (edited)
Craig- Head over when your around, show you what a RB30 can do, if its not broken....

Joel- yeah better than RB25, still stock GTR plenum, Bit bigger cams than stock.

Will do mate have fun.

Edited by GTROB
Cubes Grand Master

Cubes

Posted
Posted

Andrew.. Are you still running around with that 100mm china fmic?

I'm having a look at a gts4 4door this week. Appears really tidy. Most likely I will grab it as its a bargain. I plan on transfering the motor over and quite possibly selling off my head and throwing a gtr head on it. Simply due to bonnet clearance issues.

I'd prefer to have the gtr head with its plenum in the gts4 for the same cost as having an rb25 head with a 700-800 odd plenum.

My only concern was the exh. manifold.. Where did u get your head to manifold flange or did you cut it out yourself?

Probably biting off a little more than I can chew with regards to fabrication. :S

sky30 Mentor

sky30

Posted
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Posted

Joel- I made the drawing of the head flange and got a mate to profile cut it. Rb25 head with a side plenum would clear the bonnet better than GTR as the front timing gear cover is wider and fouls on the front corner, the rb25 cover isnt as wide.

How much $ you picking the 4 door up for?

sky30 Mentor

sky30

Posted
  • Author
Posted
Joel- I made the drawing of the head flange and got a mate to profile cut it. Rb25 head with a side plenum would clear the bonnet better than GTR as the front timing gear cover is wider and fouls on the front corner, the rb25 cover isnt as wide.

How much $ you picking the 4 door up for?

Dyno graph pic, and couple of others.

post-11223-1174195659.jpgpost-11223-1174195958.jpg

post-11223-1174195737.jpg

Cubes Grand Master

Cubes

Posted
Posted
Joel- I made the drawing of the head flange and got a mate to profile cut it. Rb25 head with a side plenum would clear the bonnet better than GTR as the front timing gear cover is wider and fouls on the front corner, the rb25 cover isnt as wide.

How much $ you picking the 4 door up for?

Even the rb20/25 front timing gear cover still fouls with the bonnet. :huh: It requires choping to allow the bonnet to close.

The 4door.. Its interstate and he wants 8k. It is cheap and 100% dead stock. It sounds too good to be true, I'll soon find out. Laying a deposit down first thing monday under the condition that it is in the condition he says, then jumping on the plane with a cheap flight down there and lmao.. drive it back. :S

We'll see. Hopefully it all works out well.

post-382-1174197503.jpg

sky30 Mentor

sky30

Posted
  • Author
Posted
Even the rb20/25 front timing gear cover still fouls with the bonnet. :P It requires choping to allow the bonnet to close.

The 4door.. Its interstate and he wants 8k. It is cheap and 100% dead stock. It sounds too good to be true, I'll soon find out. Laying a deposit down first thing monday under the condition that it is in the condition he says, then jumping on the plane with a cheap flight down there and lmao.. drive it back. :S

We'll see. Hopefully it all works out well.

Soun good joel, With the RB25covr in my black car i never had to chop the bonnet supports, just modifed the engine mounts.

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