Rb26 Or Rb 30

[PM-R33]

I don't know why people are so afraid of spending the money on a big head job :s

I just paid a lot for mine, however i do love good head.

[sky30]

RB20 170rwhp+ between 4700-7700rpm = 3000rpm

RB30 170rwhp+ between 3500-6000rpm= 2500rpm

we will call that a win to the RB20

RB20 230rwhp+ between 5750-7500rpm = 1750rpm

RB30 230rwhp+ between 4400-5800rpm = 1400rpm

another win to the mighty short stroke machine

and dont give me the sh1t about the rb30 will last longer because of the revs bullshit, a rb20 will never die haha

That is the worst comparison i have seen, your saying the rb30 will only make 170+ hp until 6000rpm just because the dyno run only revs to 6000rpm??? The rb30 will hold over 170hp till well after what your saying.

Can u tell me what boost and power you think the rb20 would be making at 2500rpm??

I would guess - 0psi, and 50HP, compare that to the RB30 you show which is already on full boost and making 135HP., the rb20 doesnt make 135hp until 4000rpm.

[GETSET]

RB30, 26 head

not my sheet, it was in another thread on this forum, sydneykid track car I think

Edited March 5, 2009 by GETSET

[T04GTR]

thats nice! im asuming its the t04z in his sig thats being used...

[N1GTR]

Everyone knows that big cams get the chicks Steve-o

I didn't know you liked doing the bottom end first still, i thought therapy fixed that? ... Zing

Throw away the little ones and put in the 280's.

I want to get rid of them

I don't know why people are so afraid of spending the money on a big head job :s

Selling 2 kidneys is not advised.

Would be better to throw the money at developing a new block.

Yeah like i said, im pretty much sold on them

[Marko R1]

Why not compare AL's 30 with GT3076 vs someones RB26 GT-SS setup? both setups will result in ~320-330kw.

i just spent 90min reading this thread thoroughly - i am also wanting to go with an rb30dett BUT im sure i feel the same as some of the gtr owners here "dropping a vl block in a gtr wtf!?"

anyway, ive come to the conclusion that i'm going rb30 for more driveability & torque (why not) - it can only be a step in the right direction, also realising that the bottom end is just an air pump & that the top end is where the power will be made. more air though means more potential to deliver more power

here is a graph of my current rb26dett with gtss setup @ 22psi which drops off to 20psi (tomei pon cams type a, no head work) - can somebody pm 'AL' to jump on this thread so that he can post his graph for comparison of his rb30dett...lets see the difference here!

re. all these ppl laying sh!t on paul 'dirtgarage' ...he has been around gtr's longer than most of us & has personally helped me with my clutch, fuel pump, drag racing etc - i even bartered his slicks for a case of coopers green, how many ppl would do that

[SLAPS]

Think of it as an R31 motor, not a VL motor.

The thing I notice with the smaller capacity motors is they tend to lag a little when they grab that next gear in 'comparison' to the rb30's that feel like they keep pulling as hard when you grab that next gear there's simply no lag.

A perfect street setup IMO would be an RB30DETT running the 26 head lightly cleaned up, pair of 272 cams with 10-10.5mm lift and a pair of GTRS's or 2530's depending on the power your after.

Twins IMO offer better transient response and quicker boost response than the big old singles even though the big singles tend to make their peak boost a little earlier in the rpm.

Ever see Keir wilsons old silver R32 GTR launch in the flesh running in to the 8's? Twins + OS 3ltr and it had absolutely ZERO issues bogging off the line in fact quite the opposite.

Ripz doesn't appear to have too many issues bogging off the line either with the 3ltr, 8.5k limiter and first run out.

Edited March 5, 2009 by TheRogue

[N1GTR]

A perfect street setup IMO would be an RB30DETT running the 26 head lightly cleaned up, pair of 272 cams with 10-10.5mm lift and a pair of GTRS's or 2530's depending on the power your after.

Mmmm.....funny you mention that setup;

(taken from rb30 results thread)

^^^Thats the old motor and setup.

Here's the current setup;

-Slightly ported head (just cleaned up, lots more metal to come out)

-Tomei cams 270 IN and EX, 10.25mm lift IN and EX

-Tomei buckets

-Tomei springs

-Tomei head restrictor

-Adj cam gears (still set to zero though )

-Mahle 87mm pistons

-Spool rods

-ACL Race bearings

-Fully prepped crank inc collar

-JUN oil pump

-N1 water pump

-Fully prepped block (no hardbloc used)

-BCNR33 N1/24U balancer

-Custom 8plus litre oil sump (baffles, gates etc)

-Alloy radiator

-Header tank

-Splitfires

-Custom fuel rail

-1000cc injectors

-3 x Bosch 044's and custom lines, speedflow fittings, huge undercar surge tank etc

-Nismo adjustable FPR

-ARC airbox

-ARC intercooler, Hard pipe kit

-HKS thermostat controlled oil cooler and relocator

-HKS GTRS Turbo kit (ceramic coated)

-Stock GTR manifolds (ceramic coated)

-Tomei dumps (ceramic coated)

-HKS front pipes (ceramic coated)

-Oil return from head

-All balanced of course!

Plus the rest of the usual gear (R3C Osgiken clutch, ProfecB specII EBC etc)

Had dramas with a recently purchased Autronic so tuned on old ECU. Limited to 18psi due to map resolution, tune took all of 45minutes in total. Will retune as soon as the Autronic is fixed and increase boost and ignition, also cams will be dialled in.

This graph is torque vs power; Needs more boost, but is already MUCH more usable then the old setup

New motor and turbo setup is already coming together, wont be long now until its in the car and tuned

The only real problem is that (like any modified GTR) by the time you're having any decent fun, you're risking jail time

But you're right, its a great streeter

[Swiper the Fox]

re. all these ppl laying sh!t on paul 'dirtgarage' ...he has been around gtr's longer than most of us & has personally helped me with my clutch, fuel pump, drag racing etc - i even bartered his slicks for a case of coopers green, how many ppl would do that

Hey Marko, its only 1 person...the rest of it is just friendly banter. Ive sent the fella a PM to see what the 'beef' is but unfortunately no reply.

Like i said to him...you cant be friends with everyone, but if i piss off a handful helping a hundred im miles in front.

[Lithium]

Ripz doesn't appear to have too many issues bogging off the line either with the 3ltr, 8.5k limiter and first run out.

Thats not with twins though, thats a dirty big GT42RS turbo I went in one of his cars running a twin scroll T04Z setup on a FullRace manifold with twin wastegates and I honestly can't see how you'd get more responsive than it. He stomped it from anywhere between 3000rpm and the rest and the thing would literally launch up the road, I honestly wouldn't believe how hard it pulled from virtually any revs if I hadn't been in the car myself. The dyno plots definitely don't tell the full story. A very staunch pro RB26 mate of mine with a 500whp R32 GTR was in the back seat (I have always been pro no-replacement-for-displacement) and while it was more than I expected despite expecting it to be really good, he was an instant convert.

[Guilt-Toy]

Yeah Paul is a helpful guy. The kind of guy I have no issues helping out whenever I can as well.

[GETSET]

Hey Marko, its only 1 person...the rest of it is just friendly banter. Ive sent the fella a PM to see what the 'beef' is but unfortunately no reply.

Like i said to him...you cant be friends with everyone, but if i piss off a handful making a profit off hundreds im miles in front.

That would be because I was willing to let it go, unlike yourself

[Swiper the Fox]

That would be because I was willing to let it go, unlike yourself

yeah your sig looks like you really are willing to let it go.

if you have a problem respond to my PM like an adult...your childish jibes on here are ruining a good thread.

Edited March 5, 2009 by DiRTgarage

[GETSET]

Sorry about that its just a lighthearted niggle...its what us aussie's do

[Swiper the Fox]

Sorry about that its just a lighthearted niggle...its what us aussie's do

Got me...nice one.

Lets move on eh?

[FineLine]

I fail to see what the todo is all about. Blind freddy can tell you that an extra 500 cc of capacity is going be a torquier engine than its smaller displacement counterpart all things being equal.

The 2.5/2.6 is also going to be the same in relation to the rb or sr 20. So what?

They can all be made to go like the clappers and embarrass the hell out of much more fancied machinery in all venues, street.strip and track.

Does that mean that everybody should ditch their sr's, 25,s 26's etc and run vl engines, I think not.

I made my choice and wouldnt swap for quids. A hot 25 that bakes them in all 4 gears and makes full boost by late 3's is plenty of fun for me. It purrs around the streets and becomes jeckyl and hyde when i nail it. What the hell more do you want.

[Guilt-Toy]

...... wins races.. horse power sells cars.

...... = ??

[FineLine]

...... wins races.. horse power sells cars.

...... = ??

It aint workin, Have a look in the classifieds and see how many big hp gtr's are languishing unwanted in the "cars for sale" section.

[Swiper the Fox]

It aint workin, Have a look in the classifieds and see how many big hp gtr's are languishing unwanted in the "cars for sale" section.

2 great posts in a row...the silver fox is on fire.

[FineLine]

2 great posts in a row...the silver fox is on fire.

Have you dealt with your stalker yet.