GTR crank n rods into GTST

[Trust33]

What is line boring?

[N I B]

What is line boring?

Basically boring the crank tunnel in the block.

[Trust33]

ok so the crank has more room to move.

[N I B]

its a recon type job to make all main bearings in line and the correct bearing crush etc.

[sweetr33]

thanx for the replies im going to talk to afew machine shops and see what i can source up.

[INASNT]

Good info on this thread, been thinking about gtr rods for a long time.

[Steve]

well over 300rwkw, over 6 months and around 10,000kms - stock internals and I havent had any probs. I even had a boost spike to 1.9bar in 3rd gear on a hot summer day, hit red line pretty quick. I was a bit worried, but that was about 5 months ago.

I think it is important to decompress the stock RB25 if you are heading into this teritory - that's what the japs do, and what I did, good fuel supply and a good tune.

JMS R33 used a similar setup for well over 300rwkw, and Danny isnt exactly renouned for his mechanical sypathy.

If the engine is in good condition, you can push them pretty hard, but if it is tired, or been abused by a previous owner (who knows for sure?), you may run into trouble down the track. But generally, it is not an uncommon thing in Japan for RB25s to put out this sort of power on stock internals.

If you have the engine out, it would be well worth upgrading to RB26 crank/rod/pistons.

They are stronger and will drop the CR to 8.5:1 AFAIK, which is where mine is. An added benefit is an extra approx 100cc of capacity, not much, but it all helps:) Plenty of GTRs putting down 300rwkw with stock internals no probs - well, I havent heard of too many failures anyways - unless stupid things are being done (eg, thrashing a cold engine)

If you want to do a full rebuild, why not just drop a 3L bottom end in. In NZ guys have run mid 400rwkw without problems, and you have all that 3L torque, hmmmm:)

[INASNT]

Steve

have you had any head work done yet? or cams?

[Steve]

Cams only

[GTRgeoff]

I did the GTR rods with my rebuild with Arias forged 1.0mm OS pistons. I got the full balance, bearings, O rings, lightened flywheel, x rays and crank cleaned out and straightened.

I have to say, it may just be the balance and the crank straightening which spun by hand easily when i torqued the crank in (and didn't before), but it felt soooo much smoother afterward. The extra mass of the rods probably limted the ebnefit of lightening the fly.

[sweetr33]

yeah, i will be going gtr crank n rods for sure, 3L bottom end was an option but not any more,

[N I B]

Rb30s nastie anyway.

[sweetr33]

well i just feel that, ive got an Rb25det, i know afew people who can help me out with bits peices from japan, so i am just going to stay with this motor, although it will be maybe 2.6 or something. I want RB25 cred no RB30

[N I B]

RB25s setup well are sweet so go for it.

[R31Nismoid]

yer, im doing the same, drop the car off in 2-3 weeks. Just waiting for parts.

RB25 crank (they are fine)

RB26 rods

forgies (not sure what yet)

Reco'd head - no cams

with all the usual balancing/machining etc etc, with my GT30 it'll go quite nicely.

If you were to go the 3ltr, you'd need a GT35 to make the most of it...

[sweetr33]

yeah, 25 block, 26 crank and rods, forgies, cams, thats me and a list of other things but thats related to this subject

[Sydneykid]

yeah' date=' 25 block, 26 crank and rods, forgies, cams, thats me QUOTE']

This post seems to contradict this one .........

I want RB25 cred

It is hardly an RB25 if it is stuffed with RB26 internals.:confused:

[Cubes]

I want RB25 cred no RB30

Why would you want RB25 cred?

For others?

Build the car the way you want it for your self, if its to impress others then suit your self

[R31Nismoid]

It is hardly an RB25 if it is stuffed with RB26 internals.:confused:

:bahaha: :bahaha: :bahaha:

[sweetr33]

well, rb25 still stanped on the engine number is what i was referring to. I am building the motor to suit me, not anyone else, i cant compare with the sub zero boys producing big kws in there gtrs n supras so dunno if its going to stand out much.