Rebuilding Rb 25det

[handyandy]

hi guys, i'm building up my rb 25det with gtr rods and arias pistons.

I have ben checking out acl for main and big end bearings.

They have two types of each duraglide, and race series.

I plan on using a gt 3037 and using the car for track and road use.

Are duraglide good enough for my level?

Also are new guides and a strong bolt set essental?

If so where do you recomend getting them from

thanks simon.

[bogcock]

depending on ur hp output

gtr rods will see 600hp without 2 much trouble, but what you have to think of is what power your aiming for..

stock 25dt bearings are reasonable, ive seen 450hp engines using stock bearings all day long...

[handyandy]

hi i'm aiming to get about 280rwkw give or take. I have supporting mods to accommodate this already.

are duaglide an upgrade from the stock bearings?

[VHR32]

Duraglides are just a replacement. Race series are an upgrade so for the little more it would cost i'd use them.

[handyandy]

cool thanks pal, and thoughts on new guides and a strong bolt set?

[R31Nismoid]

Who's doing the build for you?

or DIY?

[217/r33]

hi guys, i'm building up my rb 25det with gtr rods and arias pistons.

I have ben checking out acl for main and big end bearings.

They have two types of each duraglide, and race series.

I plan on using a gt 3037 and using the car for track and road use.

Are duraglide good enough for my level?

Also are new guides and a strong bolt set essental?

If so where do you recomend getting them from

thanks simon.

What gt3037 are you going with ? The .63 or .82 exhaust flange? Internal or external gate?

Edited June 23, 2006 by 217/r33

[handyandy]

nis-i'm going to get the block and head machined and built by nigel at raceline with standard crank rb26 rods arias pistons. Keep the head the same and change cr to 8.5 using hks or similar head gasket.

Assembling the rest myself with a mechanic mate.

217/r33-ive been told that the .63 int gated turbo will suit my needs. Thats with some cams thrown in.

Any help is appreciated, simon

[R31Nismoid]

.63 is gonna be REAL snappy IMO.

You might have traction issues unlike if you used a .82 which would be a bit more liner in delivery

[handyandy]

nis- cheers, even with wide rubber?

what would the difference be with boost issues? Would the .82 bring boost on early in the rev range?

I don't know too much about turbo's. please explain!

thanks simon

[R31Nismoid]

The larger rear housing is only going to affect spool by around 400-500rpm.

eg. .63 comes on around 3600 and really quick delivery

.82 comes on around 4000 a more smoother delivery than the .63 and have a greatwer top end.

The 3037 isnt a large turbo really, it will go very nicely on an RB25 with the .82... or .83 or whatever it is that it comes with

[handyandy]

nis- thanks pal, that makes sence. anything else you think i'll need to change from stock?

[R31Nismoid]

Usual injectors/ECU/clutch/fuel pump etc etc.

Im sure Nige & Karl will sort you out mate. They are definately on the ball.

EDIT: If Nige is doing the bottom end, he will know what bearings to use etc.

N1 oil pump and a collar to suit on the RB25 crank aswell

[handyandy]

nis- yeah i'm on my way. thanks for the help

[Abo Bob]

I'd suggest getting a little headwork done while it's apart to achieve the compression ratio you are after rather than using a thick head gasket because you will maintain the squish zones that Nissan so carefully designed for you.

[handyandy]

abo- what are these squish zones you talk about? what sort of head work? port? polish?

i was told head work was not needed for what i was after. Are there problems with using a thick head gasket to achieve 8.5 cr?

Ihave also been told that o-ringing the head and or block is noot needed for my power levels.

can someeone explain this also?

thanks simon

Edited June 25, 2006 by handyandy

[R31Nismoid]

If it was my choice - i'd leave the head alone aswell.

For your power goal... unless you have money to burn, then not really worthwhile.

I ran over 300rwkw with the stock RB25 head

[handyandy]

nis-yeah, sweet, what power level did you get and with what setup?

[Roy]

If it was my choice - i'd leave the head alone aswell.

For your power goal... unless you have money to burn, then not really worthwhile.

I ran over 300rwkw with the stock RB25 head

...but whats the price of Jap head gaskets that lower the compression to around 8.5:1? Not all headwork is expensive, i suppose it depends if its the ports or chamber you tweak...so food for thought

[R31Nismoid]

The Tomei gasket that was used would hardly break the budget... and i would be confident its cheaper than a port/polish etc.

If i remember ill find out how thick it was...

I wouldnt say a lot to be honest. The car was more zippy off boost before the gasket. Although im sure tuning has a fair part there.