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Rb30det/tt Vs 2jz

Jago

By Jago,
in Engines & Forced Induction

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Warpspeed
Warpspeed

Yes and no. Engineering is all about calculating stress and fatigue limits, and staying within known and reasonable bounds. The guys that design and build bridges and high rise buildings do not bui

bubba Grand Master

bubba

Posted
Posted

Well, I am not a guru but I can tell you straight up a 2JZGTE can handle 600+hp in factory form. An RB26/30 is a purpose built engine and will handle as much as the parts you can afford to put in it.

One of my mates has a mk.4 2jz supra, came from japan pushing 300rwhp and ran a best ET of 12.7 (with slicks).

Another mate has an RB25/30DETT, made 310rwhp @ 10psi but never saw the strip like that. Now makes 494rwhp @ 21psi.

The RB engine at a similar power output felt a bit harsher than the 2JZ but that was probably just turbo combination and the fact that he was only running a rev limit of 5500rpm at that time as it was leaning out.. full boost by 4000rpm and hit the limiter at 5500rpm! Now, I never drove this car with the RB30, only when it had an RB20.

I did however drive the supra around the time the owner ran a 12.7, it felt a hell of a lot smoother and with the sequential turbos starting to boost ~2000rpm, the power delivery felt very linear.

The supra was pretty much factory and the engine came in that car, the RB on the other hand is in a VH commodore.. so it's kinda hard to tell :)

Cubes Grand Master

Cubes

Posted
Posted

300rwhp without sequential turbo's but using only a stock rb25det turbo the rb30det's make all their boost ~2000rpm. So not really a good comparison.

At what power level (not US dyno power levels but here in AUS) do the 2jz's start bending rods?

I've on occasions visited the supraforums and laughed quite hard how they seem to think rb25/26's and 30's melt pistons. lmao.. Poor tuning melts/breaks pistons. :)

My general feeling is the 2JZ is a slightly stronger motor than the RB30. RB30DET's have reasonable bottom ends, they manage to hold close to 400rwkw providing the tune is good. I have no idea what the 2jz is capable of on an AUS dyno.

nizmo_freek Experienced

nizmo_freek

Posted
Posted
as bubba said, factory form 600+ hp as opposed to purpose built rb30det. i have some massive respect for the 2jz. I would even compare a 1jz to a rb26det, as many people do these days.

You dont need a "purpose built" rb30 to make huge power, just look at what Rob from R.I.P.S here in N.Z has done with rb30's, just to name a few, his r32 gts4, rb30det with 100% standard internals and stock r32 rb25de head made 447rwkw and ran a 10.21 @ 134mph and was proven to be very reliable, another r32 gts4 that he built made 400rwkw+ reliably with completly stock internals and also has run numerous 10sec passes.And im sure there a lots more rb30's with stock internals making more power than both of those cars.

2gceffy Rising Star

2gceffy

Posted
Posted (edited)

the guys how did my engine conversion had a 2jz in his 180sx, there was a write up on it in HPI.. had 430rwkw stock internals only had injectors and manifold turbo combo.. was a total beat ran a 10.54 i beleave

i really love both engines so id be happy to own either one

but if i had to bite the bullet id prob hit up the 2jz

Edited by 2gceffy
Cubes Grand Master

Cubes

Posted
Posted
the guys how did my engine conversion had a 2jz in his 180sx, there was a write up on it in HPI.. had 430rwkw stock internals only had injectors and manifold turbo combo.. was a total beat ran a 10.54 i beleave

i really love both engines so id be happy to own either one

but if i had to bite the bullet id prob hit up the 2jz

Heavier VL's with their RB30 SOHC's run 10.5's with bolt ons and a shade over 300rwkw. :S

Cubes Grand Master

Cubes

Posted
Posted

Whats actually wrong with the head?

Small ports/valves?

The port angles/size appear to look ok to me?

http://images.google.com.au/imgres?imgurl=...%3Doff%26sa%3DN

Apparently each port has a slightly different design which makes them a nightmare to work on when porting

Ryanrb25 Grand Master

Ryanrb25

Posted
Posted
You dont need a "purpose built" rb30 to make huge power, just look at what Rob from R.I.P.S here in N.Z has done with rb30's, just to name a few, his r32 gts4, rb30det with 100% standard internals and stock r32 rb25de head made 447rwkw and ran a 10.21 @ 134mph and was proven to be very reliable, another r32 gts4 that he built made 400rwkw+ reliably with completly stock internals and also has run numerous 10sec passes.And im sure there a lots more rb30's with stock internals making more power than both of those cars.

yea all i was getting at was the fact that the rb30det is basically a purpose built thing and not an origional thing. where as 2j is a factory motor doin the same thing.

1JZ head designed by Yamaha. 2JZ by Toyota......says it all really.

Thats why 1.5 JZ (1JZ head, 2JZ block) would be the best combo for power making!

that's very interesting, i would imagine yamaha would have designed the head for revvvving!

also i believe all forced induction toyotas came with forgies....including 3sgte 4agze etc etc.

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