R33 Rb30 Conversion

[Sydneykid]

yeah they finally released it, actually useful data for once

pitty it needs to much damn turbine speed to get anything useful from it

whats a realistic rpm we are talking to get a 0.70 a/r housing fast enough to make the compressor flow 1.5 bar. is there a way to mathematically work this out?

given that we know required turbine speed and pressure ratio ?

72% efficiency for 65 lbs/min of airflow for 1.5 bar boost at just under 100,000 rpm is pretty damn good.

A ball bearing turbo will last forever at those sorts of loads.

The only turbine map I have seen is for the 0.84.

cheers

[Spoolup]

0.84 is whats Im using - so Im happy :-)

[r33_racer]

i think we figured out why ours isnt holding boost. To do with a lack of backpressure in our exhaust system now haha. So yeh..hopefully find out in a day or so if the fix will work.

Spoolup...what manifold are you running again? Is it one of Kyles? Ok so i just backchecked last page...and you do run one of kyles. Well i just got back from seeing kyle at Mercury before. With our situation, because we put a 4" system on now there is virtually no backpressure whatsoever and because his manifolds are so efficient and now our exhaust system is super efficient, the exhaust gas is bypassing the wastegate completely as soon as gas velocity starts to skyrocket. Kyles fix, for us atleast, is to modify the rear housing so the wastegate is mounted straight off the turbines feed so exhaust gas is forced into the wastegate and cannot bypass thus letting us control boost pressure perfectly. Ive got a modified housing with me now, which will go on tomorrow hopefully or asap and we will know how it goes, but im highly confident it will fix the problem.

Unfortunately I dont think that will fix your problem Spoolup.

Edited February 12, 2007 by r33_racer

[r_speedfreak_r]

Hey all. You may of covered this already but 241 pages is alot to read lol. What crank is everyone running on the conversion. I found out today my the crank i got with my rb30 block is no good. Do you think its worth the money and finding a performance crank or just put my money elsewhere go find another crank from the wreckers and just get it checked over?

[handyandy]

Hey all. You may of covered this already but 241 pages is alot to read lol. What crank is everyone running on the conversion. I found out today my the crank i got with my rb30 block is no good. Do you think its worth the money and finding a performance crank or just put my money elsewhere go find another crank from the wreckers and just get it checked over?

Hi pal, depends what you want out of your engine.

stock rb30 should be fine. Thats what i'm using for my build.

simon

[Spoolup]

yeah funny enough I was talking to Kyle today about my problem also, he said he had a 60mm hks gate like mine there that had a 3mm gap between the valve and the seat, and it was new. So Ill put some plasticine on the seat and put the gate back on, then pull it apart to see if the valve is actually seating on the seat ( it should have approx 1 mm of preload ).

Oh the joy of it all :-)

i think we figured out why ours isnt holding boost. To do with a lack of backpressure in our exhaust system now haha. So yeh..hopefully find out in a day or so if the fix will work.

Spoolup...what manifold are you running again? Is it one of Kyles? Ok so i just backchecked last page...and you do run one of kyles. Well i just got back from seeing kyle at Mercury before. With our situation, because we put a 4" system on now there is virtually no backpressure whatsoever and because his manifolds are so efficient and now our exhaust system is super efficient, the exhaust gas is bypassing the wastegate completely as soon as gas velocity starts to skyrocket. Kyles fix, for us atleast, is to modify the rear housing so the wastegate is mounted straight off the turbines feed so exhaust gas is forced into the wastegate and cannot bypass thus letting us control boost pressure perfectly. Ive got a modified housing with me now, which will go on tomorrow hopefully or asap and we will know how it goes, but im highly confident it will fix the problem.

Unfortunately I dont think that will fix your problem Spoolup.

[r_speedfreak_r]

ok sweet thats what ill end up doing just with a different crank pulley. does anyone have any info on the oil gallery in the head i have to weld up. Or something about mods i have to do to make the vct work

[r33_racer]

Here are some photos of kyles manifold, it shows the wastegate pipe setup. These are for Sky30 more so, but it may be of some interest to everyone else.

Just for you cubes

Edited February 12, 2007 by r33_racer

[Cubes]

Interesting.. Kyle has gone all out with preventing reversion.

Very nice exhaust manifold. I have never seen the collector of one.

Awesome Pics. Thanks.

You didn't grab any of directly down the throat of the collector did you?

[r33_racer]

haha...actually i did. Since you asked ill add it into the post.

[Cubes]

One word.. Insane..

Worth every cent.

[shanef]

ok guys, just finished dummy fitting the engine in the engine bay, what a farking task, as its been out for about 8 months now.

Ok its in and sitting on the engine mounts, however, the front is sticking up in the air far too much, and the bonnet is no wear near closing. I'm using the std RB26 engine mounts, and i've tried to fit them and the rb30 ones in all sort of combo's but the only ones that fit r the std rb26 ones. I had a quick look underneath, and it seems to me that part of the sump, is resting on the cross member, has anyone dealt with an rb26/30 in a gtr before? Oh and in regards to if the dumps clear the firewall, yes they did, only just however, as i've removed the aircon, the drain pipe that comes out of the firewall was removed, and the dumps JUST fitted down there, i had to force it a bit to get the pass. engine mount in the hole, but it fits.

heres the pics i took:

[r33_racer]

very nice shane....im drooling mate, im deadset drooling.

[nemini90]

shanef i have seen spacer plates put in between the crossmember and the chassie rail befor to get the motor down lower

[sky30]

Shane, I have cut about 100mm piece out of the one of the under bonnt supports where it hits the cam belt cover, now my bonnet shuts and just clears.

What turbos you using there?

[Scooby]

Hi Shane, not sure what's going on there. Cross member clearance shouldn't be a problem, the deck height is increased at the upper end of the block from the top of the water pump upwards. And the bonnet should well and truly close if you can fit a strut brace under there, the're a lot higher than 38mm above the cam covers. The engine is supposed to be on a bit of an angle but the clearance should still be good. Try looking on the GTROC UK site for comparison pics

http://www.gtr.co.uk/forum/upload/52458-rb...ight=r32+combat

at the risk of stating the obvious it seems that the whole engine is tilted way to far up at the front and that's what is causing the sump to hit at the rear.

[Cubes]

Hi Shane, not sure what's going on there. Cross member clearance shouldn't be a problem, the deck height is increased at the upper end of the block from the top of the water pump upwards. And the bonnet should well and truly close if you can fit a strut brace under there, the're a lot higher than 38mm above the cam covers. The engine is supposed to be on a bit of an angle but the clearance should still be good. Try looking on the GTROC UK site for comparison pics

http://www.gtr.co.uk/forum/upload/52458-rb...ight=r32+combat

at the risk of stating the obvious it seems that the whole engine is tilted way to far up at the front and that's what is causing the sump to hit at the rear.

The GTR/GTS4's run a block/sump adaptot plate so it also lowers the sump down slightly.

Anotonys GTS4, everything is VERY close. The bonnet had to be cut as the cam belt cover was touching.

[Roy]

This is so farked. I have an RB26 bottom end with Eagle rods ready to go with an RB25DE head when i find one. I was planning on using a 3076R 56trim with the HKS manifold and wastegate i have. I also have SKY30's old Apexi cams.

NOW, here is the problem. I thought a 3076R with 2.6L would be very puncy. But on the weekend i went in an RB25 with 270rwkws from a HKS GT-RS, headwork and Proncams. I was expecting it to have more grunt and pull.

Now my problem is i was planning on using a turbo bigger then the GT-RS and i now doubt i will get what i want from the RB26.

I have looked through the RB30 results and i cant see anyone using a 3076R on an RB30. Can anyone point me in the direction of an RB30 with a similar setup so i can get an idea of the mid range it will have?

[Cubes]

Troymeister,

This is an old dyno sheet i've kept since the early rb30det days.

I believe it was a GT3040 .82 running 1bar. Both were tuned to optimal afr's and ignition, std plenum nice ext gate hotside.

I believe it was this bloke that later went the gt35r .82, he said he's never looked back. I've actually had a couple tell me that. GT30r to GT35r and never looked back.

For the track I really think the GT35r .82 is a really nice match. I'm going a GT35r .82 with the xr6 .5 comp cover, as suggested by the local turbo bloke (ATS). It should be good for up to around 350rwkw. Why the .5, well I suggested it and he said most definitely, it improves streetability without killing top end for the power levels you are looking at.

Also.. Antony's Rb30DET gt35r .82exh .7comp. Loaded up on the brake I saw 15psi by a shade over 3000rpm!! I was quite impressed. Its slowly being all sorted and turning in to an awesome package. As should mine be after I stop this damn mig wire sticking to the item I'm welding.

[Roy]

Thanks...thats a Racepace dyno sheet. Maybe i need to have another chat with him