Couple Of Rb26/30 Questions

[Z24O]

collecting parts for 26/30 conversion but need a couple of answers....

1) rb30 or rb26 head gasket?

2) looking for maximum torque and 7000rpm limit,any advantage to swapping std cams out for regrinds...if so what specs?

3) anyone used a copper head gasket,any dis/advantages?

4) worth 'O' ringing the block?

5) is the std nissan head gasket better than the cometic?

6) will the std RB30 balancer be ok under 7000rpm?

8) suggested single turbo for low end torque?

cheers guys

[VB-]

well i've been way off on alot things lately so make sure you get a second opinion, but i'll give you a start where i can

1. cant remember, someone told me you can use either, but i get a feeling you need the twin cam one - i know that wasnt much help (told you you'd need a second opinion)

2. for a street car, use standard cams. i think Ben (racepace) put standard cams back in his race car after having larger ones in there, thats saying something?

3. copper gaskets, not much first hand experience, but in theory - good because they conduct heat well, meaning less chance of heatspots forming on the ring of the gasket, bad because they can have issues with seepage

4. probly not for lower power levels, and i *think* thats mainly for copper gaskets???? someone confirm that for me

5. cometic is better (MLS gaskets)

6. is it in good condition? see how much you can get a new one for, its cheap insurance really

7. you cant count lol

8. GT35R

[r33_racer]

i would change 8 to gt30r.

number 1 to twin cam headgasket fo shizzle.

[VB-]

i had tought about mentioning GT30, i think cubes runs one? but its mixes results, some say it comes on too hard too early and just results in wheel spin, obviously it will yeild more low down torque, but its too much?

edit - just read a post of cubes saying its very linear.... and doesnt reult in wheel spin, GT30 might be an option

Edited July 27, 2008 by VB-

[Z24O]

thanks fellas

i've got a spare gt3076 but it's a IWG/0.82 turbine housing which i am presuming is too small for the twin can rb30.....also my manifold is T4 flange/external wastegate,as are most aftermarket ones

[Adriano]

Im building a 30/25 neo at the moment, will be running .86 gt3076, i think it will be the ultimate street setup. No lag with over 300rwkw within easy reach

[Z24O]

Im building a 30/25 neo at the moment, will be running .86 gt3076, i think it will be the ultimate street setup. No lag with over 300rwkw within easy reach

you don't reckon it will be like a like switch??

when are you expecting boost to start and be all in by rev wise?

300rwkw at what psi?

[Adriano]

you don't reckon it will be like a like switch??

when are you expecting boost to start and be all in by rev wise?

300rwkw at what psi?

The opposite of a light switch, it should be a torque monster, making meaningful boost and torque from 2500. Full boost of about 16 psi should be in by below 3500.

[Z24O]

The opposite of a light switch, it should be a torque monster, making meaningful boost and torque from 2500. Full boost of about 16 psi should be in by below 3500.

even with the 0.82 turbine housing?i thought they were choked up on an rb30et let alone a twin cam 3.0l

[r33_racer]

we had a .82 gt30 on our old rb30det...think we pushed 365-370rwkws out of it with water/meth injection on shell 100 pulp. 8k redline and it was pulling all the way...didnt die out at all from memory. 256 8.5mm tomei poncams and greddy inlet, is what helped it maintain that power rise to redline...atleast thats what i think...maybe the water/meth injection too

[James_03]

collecting parts for 26/30 conversion but need a couple of answers....

1) rb30 or rb26 head gasket?

2) looking for maximum torque and 7000rpm limit,any advantage to swapping std cams out for regrinds...if so what specs?

3) anyone used a copper head gasket,any dis/advantages?

4) worth 'O' ringing the block?

5) is the std nissan head gasket better than the cometic?

6) will the std RB30 balancer be ok under 7000rpm?

8) suggested single turbo for low end torque?

cheers guys

1. Either way, more options available 26 way but.

2. Standard cams, go pon cams if anything.

3. Yes I have used them, prefer mls gaskets but less dicking around.

4. Only if your going copper gasket

5. No

6. Yes, ati to be safe but.

7. 35r as previously mentioned.

[Z24O]

so anyone with a GT30 on their RB26/30 want to chime in as to hp/torque/psi

a few guys reckon they saw boost/rpm much the same with the GT35 as the GT30 on the 3.0l twincam....as usual can't find the thread again,think the guys name was darren and he had it in an r31??