R32 With R33 Engine

[NismoooR34]

Hey guys I want to gather some knowledge about putting and R33(rb25det) engine into my R32 gtst .

Would the 32 stock gear box run fine with the 33 engine , what would I have to look into or change along with the engine ? Would it be worth the conversion ?

Any info, tips or help would be Much appreciated

Regards , Michael

[GTSBoy]

This is a searchable topic. Been discussed in great detail.

RB20 turbo box will not last long behind RB25DET.

[NismoooR34]

Well I wouldn't search for a topic I make my own that's what a forum is for .

Yeah I thought a 20 box wouldn't be enough , how much would a rb25 and box be roughly , my guess would be $1700-$2100

[GTScotT]

Actually the forum is for accumulating relevant information to help everyone. It's useless having 300 different threads all about the same thing, forcing people to read too far and wide for one thing and forcing others to answer the same questions over and over.

If we keep everything in one thread we can make it easy to find information and most people will probably find that their questions are already answered.

Such as:

http://www.skylinesaustralia.com/forums/topic/83872-r33-gbox-in-r32/?hl=%2Brb25+%2Br32+%2Bconversion#entry1518749

http://www.skylinesaustralia.com/forums/topic/397751-r32-rb20det-to-r33-rb25det/?hl=%2Brb25+%2Br32+%2Bconversion

[TTT]

I've got a stock Rb25det with a stock RB20det gearbox.

FMIC, exhaust, pod, 10psi boost, good clutch.

no broken box yet... but I'm not out thrashing the crap out of it.

I reckon that a stock turbo'd RB25det will not break an RB20 box.

with my conversion we used a Stock RB25det ecu which required some wiring work.

there is some work required with the heater hoses at the back of the engine and fire wall area.

Other than that it's all smooth torquey sailing.

[GTSBoy]

Whereas I wore out the bearings in a couple of R32 boxes behind a near stock RB20 + the usual mods = 170rwkW. The extra torque does them no good at all. RB25s come with that much torque standard, and no-one can resist adding boost + exhaust + FMIC etc etc etc.

[TTT]

I guess we can definitely agree that there is no need to replace a working box considering it also requires a custom tailshaft which adds to the cost.

Run the stock 20 box. if it breaks, upgrade to 25

[Hanaldo]

My mate has been running his 20 box behind his TD06 350rwhp RB25 for 3 years now. Skids, drags, track days, clutchless shifting. 20 box hasn't missed a beat.

[Hanaldo]

Should clarify I wasn't recommending doing it ^ The 20 box is sloppy as all hell, I hate them.

But considering you can't really sell them off for much, I'd say it's more worthwhile to run them into the ground behind the 25 and THEN switch to the 25 box.

[Frosty]

Rb20 boxes are a lot better than people seem to believe but u will def break it under heavy clamp load like a twin plate for instance

I ran a rb25 with 400whp and a locker with 20box and its still going strong on the track (drift car btw)

[TTT]

Roys rb20 box has been behind his near 300rwkw rb20 for years and he doesn't baby that thing.

now with a 350rwkw RB25 lets see what happens.

Either way, when doing the conversion, save your $2K odd for later if the box breaks.

[GTScotT]

For the record the RB20 box is no different to the CA18, SR20, RB30ET etc..

There are plenty of people out there with big power SR's who run the stock box, they aren't tooth picks waiting to snap.. Just need to treat it right.

For myself I will probably look for a billet gearset when the time comes as the money on a second hand RB25 box conversion rivals the cost... And I would much rather have a rebuilt billet box than an old sloppy RB25 box.

[NismoooR34]

In your experiences guys , how much will is set me back ? Break it up into parts And possible labour (my mate will probably do it with me)

[Frosty]

are we talking about the box now or the whole conversion?

[GTSBoy]

I dropped more than $6k in doing a Neo25 + box + non-HICAS subframe transplant. Easily.

[NismoooR34]

Wow 6k I would rather buy a 32 GTR , yeah everything box engine bla bla , I seen a 33 engine close to my area a while back for $1300 , don't know if it includes everything ...

When I am shopping Around for engines what do I have to make sure it comes with , so I don't have any stuff arounds

[Frosty]

well it depends on your aspects but you would want a complete Rb25

RB25 (series 1 or 2) 2 has vct! ensure it comes with manifold, wiring loom and ecu. that will get you out of trouble. While its out change heater hoses and put in a new rear main seal and things like that to save you the trouble later when its running.

the rest of the cost will come from things like wiring under the dash as its slightly different etc....if you are not running with a gear box change you could prob pull it in for 3k or so

[TTT]

Mine cost $3500 limp in, skid out.

That was, stock series 1 RB25det, new radiator and hoses, stock series 1 RB25DET ECU, new oil/filter/coolant/spark plugs.

We re-used my good coil packs

Engine was $1500 to buy from a wrecker with 3 months warranty.

ECU was $200

Radiator and hoses was about $200

oil/filter/coolant/plugs was say another $100

So about $1500 for a workshop do do it all.

If you're in Brisbane you can have a drive.

[GTSBoy]

The place where you start burning money in this sort of thing is where you're making decisions on what you are happy to live with after the conversion. Things like - do I want to keep the 20 year old air-con compressor, or do I want to put the new one that came with the engine? If the hoses are different (and they are between RB20 and Neo) then a few hundred goes west right there. Same with power steering.

And the same with the things that people like to freshen up. Water pumps, timing belts, oil seals, water hoses, etc etc. They all add up.

[GTR_JOEY]

Right on

Save the extra cash and do as much preventive Maintenance as possible now...

Also if you have mods you wish to do in the future, might well be worth trying to do them all now