GTR crank n rods into GTST

[sweetr33]

Hey i was wondering what machining needs to be done to an RB25DET to fit GTR crank and rods? Is it a big job? Is it worth the hassle or would it be better to stick with standard crank, building motor to push out 400rwhp so would it be a benifit for my power level target?

[meggala]

rumor has it it is a bolt in situation. and that a pretty cofindent rumour

[DoughBoy]

It's bolt in, but you need RB26 pistons as the compression height is smaller in the RB26 pistons to accomodate the increase in stroke.

If you use an R33 crank you need to change oil pump as well to accomodate the larger gear?

[sweetr33]

fair dinkum? Bolt in is a nice thing to know, oil pump change isnt a drama, since the motor will be out of the car anyway. Any idea of the cost of an r33 gtr pump to suit the gtr crank?

[N I B]

Rb26 crank rods and pistons are a tru bolt in fit in an RB26 only a slight compresion differance but not a problem.RB25 oil pump fits on the 26 crank but an upgrade is a good idea.

[Trust33]

it would be a waste one would think to fit these to make such a small hp figure i reakon save for stronger pistons,linished rb26 rods and a set of cams cam gears etc this car would be a totally internally reliabe 400rwhp streeter SK your needed:) someone correct me if im wrong.

[N I B]

GTStvspecs RB25 has prepped GTR rods and Arias pistons balance only on his RB25 and has 450rwhp totally relaible so don't underestimate RB25s.

[Trust33]

There you go no cams.What i was suggesting was not to spend your money on the crank when the rb25 could handle it spend it on another avenue of performance.

[AZZA]

Hi all

Im new to this site and i was wondering what everyone would suggest, for me to be able to get around 300rwk from my gtst without changing the internals.

Current mods are full 3in exhaust, pod filter, adjustable tein suspension. Everything else is still stock as ive only had the car 3months. any sugestions would be appreciated thanx. These cars are the best :headspin:

[sweetr33]

so gtr rods will fit on the gtst crank? Sorry for the questions, as dumb as they may sound i honestly have no experience in this field and want to know alot b4 i build my motor, i dont want to build it and then find out that i could have used something else etc to get a better result.. thanx

[Maxx]

some cam, VERY good tune & a HKS [email protected] will do the job.

sure also all support fuel & cooling system

[DoughBoy]

Yep, RB26 rods are a cheap upgrade in an RB25 - rod length, journal size and gudgeon pin size are all the same. Rod width is a bit beefier, expecially around the big end journal.

300rwkw is pretty easy to get on a standard bottom end, there are a ton of posts on the forums of people who have done it.

[sweetr33]

hmmm so much to think about, im interested in this whole bore size diameter as to what power target im after. any ideas?

[N I B]

300rwkw Stock RBs dont last to long tho.

[DoughBoy]

I dunno, there are alot of ways to go about getting that 300rwkw, some may be harder on the engine than others.

[R33vit]

Im going to hijack the thread by asking if anyone knows whether the GTR cams fit in a RB25?

[DoughBoy]

No V.V.T. on the intake so you'll need to swap over to either RB26 cam gears or adjustables. Are you talking standard cams? If they are aftermarket you need to be careful of lift as they are made for solid followers, not hydraulic as the RB25s are... unless you convert them with a Tomei kit. Or RB26 valvetrain. Or make your own out of Coke cans. Or ask Alby Mangles for another way.

[R33vit]

No V.V.T. on the intake so you'll need to swap over to either RB26 cam gears or adjustables. Are you talking standard cams? If they are aftermarket you need to be careful of lift as they are made for solid followers, not hydraulic as the RB25s are... unless you convert them with a Tomei kit. Or RB26 valvetrain. Or make your own out of Coke cans. Or ask Alby Mangles for another way.

LOL (clown)

Im talking Standard cams, with adjustable gear.. I heard that this mode is done on the RB20's.. Not sure it would benifit a rb25

SK mite be abled to answer this Question

[hungry6]

I'm supprise no one mention that a rb25 block have to be line bore to accomodate a rb26 crank.

[N I B]

Thats because they dont need to be line bored.The cams work but the VVT is nice to keep.