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R33 Rb30 Conversion

JNR24

By JNR24,
in Engines & Forced Induction

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Fitzpatrick Speed Works Mentor

Fitzpatrick Speed Works

Posted
Posted

For the sump adapter plate i will be asking around $400 for the plate, the you will have to drill some holes and tap thread the adapter plate around another $100 for a machining shop a have aluminium lugs welded to your sump to remove to studs to change to longer bolts which will probably cost a further $100. Im selling the plates basically at cost plus aroun 80 for developement cost as i wasted around $800 worth of 10mm cadium plated mild steel working it all out and fitting it perfectly. If people are interested they can PM and if they buy one i will provide accurate and detailed instructions on what to do!!! Thanks

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Duncan
Duncan

Just thought I would bump this 20 year old thread because the Skid Factory have just posted up a video summarising a lot of the content, format might be more familiar for newer members

JNR24
JNR24

fyi guys, Well yesturday i picked up a RB30 for my conversion into my R33. I will be using my RB25DET head on the RB30 block. So i started stripping the motor down, pulled the crank, pistons, girdle

Cubes
Cubes

Here is all I have at the moment: http://www.geocities.com/r32_jjc/ Unless you are on broad band make sure you right click then save as. The file is around 120kb. If there is anything I have got w

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Gilly Contributor

Gilly

Posted
Posted
I just like the idea of not having to worry about a worn belt letting go, or a tensioner bearing bolt snapping to blow my motor. I reckon around 80,000 is a good time...hell why not 50,000 kms when the two tensioners + belt comes to $220 for a major service.. :cheers:

If you are worried about pistons contacting valves just sit your head on with the gasket in place and put a piece of plastacein on your valve and rotate your engine and pull the head off to check the thickness of the plastacein. I am pretty sure it will clear. So if you break a belt It will not damage your engine. Just a thought to give you piece of mind.

Gilly

Cubes Grand Master

Cubes

Posted
Posted

Ben,

I gave Shaun a buzz.

15mm on the drivers side.

12mm on the passenger side.

----

I've chosen a turbo.

GT35R BB with a custom .82 exhaust a/r that has a flange in the scroll to allow the bolt up of a external gate. This way I don't have the extra expense of a custom exhaust manifold. Power difference..

With this exhaust a/r it made 306rwkw on 18-19psi with all the boost in before 4000rpm on a RB30DET. ~1bar at 3500rpm.

I am thinking of getting the exhaust housing powerported or also known as extrude honed to help increase spool rate and power a little.

Generally a good power port with reduce spool by around 200-300rpm so I've been told.

Hopefully it works well..

Now to wait for the exhaust housing to land at my door step then off to buy the core/cover.

Good thing I didn't buy GTR injectors. :)

Cubes Grand Master

Cubes

Posted
Posted
what did that set u back joel?

and what size wastegate u planning on useing?

I've yet to work out the size I need.

I am aiming for around 20psi absolute max, now to dig up SK's airflow calc's to determine the size required. :)

I am going to try and have a 180degree bend in the wastegate pipe from the turbo and place the wastegate under the turbo with it joining back up from the underneath of the dump/front pipe.

It looks like it will all fit by my measurements.

Then I will make up a nice little exhaust shield and hopefully manage to hide it. I will get the exhaust shield painted black to give it a little more stealth.

The exhaust housing is second hand & has already been machined up so its costing me $100. Sounds like a decent price. Whats $100 compared to everything else. lol.

yeh...

but my "GONNA DO" plan was to do the 120 degree bend from throttle option.

I think that will still fit..

120degree bend won't fit. It really is much closer than you realise.

Stick a bit of stiff hose in the engine bay so it is relatively tight. Close the bonnet and measure the distance you have at the front of the plenum.

Then tack on another 38mm for the extra deck height and minus around 14mm.

You will find you have around 2cm's clearance from the front top of the plenum.

Then watch the bonnet slope down towards the front of the car. You will not fit a pipe over the top of the motor at that point. Maybe a 1" pipe. :P

Cubes Grand Master

Cubes

Posted
Posted

Standard exhaust manifold... :D

Apparently the .82 starts to limit power up over 320rwkw.

Using a 1.01 rear housing I've heard of the GT35R making around 290rwkw on close to 25psi.

The GT35R .82a/r is rated at 620hp, 1.01a/r is rated at 700hp.

discopotato03 Grand Master

discopotato03

Posted
Posted

Cubes that exhaust housing looks very like some of the large series TO4's I've seen around .

Sorry to be negative but the genuine GT35R turbine housings have a different shaped passage , to better suit the greater tip hight "paddle wheel" style GT turbines . RS500 had a post ages ago about the downside of using TO4 housings with GT series turbines .

A fellow I know used to weld external gate fittings onto FJ20 and RB30ET exhaust manifolds so maybe this could be done to an RB20/25 exhaust manifold .

Good luck anyway cheers A .

Cubes Grand Master

Cubes

Posted
Posted

I was told it isn't really a 'performance' housing but has made 306rwkw on 18-19psi with 1bar by around 3500rpm. (spool is subjective)

Moving from this housing to a custom exhaust manifold & garret housing picked up ~20rwkw.

The GT35 compressor map suggests 19psi is around the mark to be making 306rwkw (490fwhp) with a 90% VE.

Big cams etc will obviously increase VE and reduce the boost required to flow the same amount of airflow.

The housing will do for now until I get a custom exhaust manifold made up the way I want (ext. gate underneath with stock turbo positioning). :P

For $100 it will make some decent power fairly easy without having the extra expense at this very moment for an external gate.

I may find I want to step down an exhaust a/r as I am not going to play with aftermarket cams so reversion won't be an issue.

The 3ltr making 20psi by 3000rpm (assumed with a .62a/r) is only just to the right of the surge line.

Should be a good experiment. :)

Alf Proficient

Alf

Posted
Posted

This "power porting" i've heard of it before but didnt know what were the benefits. From what I've been told a fluid with fine sand is pumped through the housing, not sure if its the exhaust or comp housing but it increases flow.

Has anyone had this done before?, from what Joel is saying it sounds like the first step in lowering the spool up time. Hrmm 200-300 rpm....:aroused:

About the wastegate location.

I have seen RB30ET's with the external wastegate welded to the exhaust housing of the turbo, would this give better response and/ or do damage to the turbo?

My ss exh manifold's external wastegate plumbing needs to be bigger in diameter, i'm looking for the cheapest option but a safe one.

Sorry to be steering away from rb30's but questions outside this thread dont seem to get the same amount of attention.

Sydneykid Grand Master

Sydneykid

Posted
Posted
This "power porting" i've heard of it before but didnt know what were the benefits. From what I've been told a fluid with fine sand is pumped through the housing, not sure if its the exhaust or comp housing but it increases flow.

Has anyone had this done before?, from what Joel is saying it sounds like the first step in lowering the spool up time. Hrmm 200-300 rpm....:aroused:

About the wastegate location.

I have seen RB30ET's with the external wastegate welded to the exhaust housing of the turbo, would this give better response and/ or do damage to the turbo?

My ss exh manifold's external wastegate plumbing needs to be bigger in diameter, i'm looking for the cheapest option but a safe one.

Sorry to be steering away from rb30's but questions outside this thread dont seem to get the same amount of attention.

You can basically power port anything, inlet manifolds, exhaust manifolds, dump pipes, intercooler pipework etc etc.

Wastegate positioning and plumbing is a very exact science, welding it to the exhaust housing is a cheap compromise. There are simply better ways.:rofl:

Alf Proficient

Alf

Posted
Posted
You can basically power port anything, inlet manifolds, exhaust manifolds, dump pipes, intercooler pipework etc etc.

Wastegate positioning and plumbing is a very exact science, welding it to the exhaust housing is a cheap compromise.  There are simply better ways.:)

Cheers for the speedy reply, always on the ball :rofl:

So if going down the power porting route for the turbo, it would be better to get both sides done? (GT35R .86 exh)

Would there be much benefit in power porting the standard 25 inlet manifold, i'm referring to the bottom half. Would this affect the low down torque?

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