WE WANT TO KNOW IT ONCE FOR ALL: RBs VS JZs

[Thrust]

Just purchased a Vertex Edition Aristo 3 litre/liter 2JZ-GTE VvT-i V300 twin turbo as a daily runaround.

I have owned no Supras, but 4 Soarers (1. 2JZ 3L NA, 2. 1JZ 2.5L auto, 3. 1JZ 2.5L manual VvT-i + single Greddy 27-38 turbo, and 4. stroked V8 5L + MP112 Supercharger)

For big tuning power stay pre VvT-i.

[R33_GTS-t]

I think the Falcon XR6 4.0I6 pisses on the RB26 and 2JZ. 1000rwhp on pump gas.

[arnout]

I've owned tuned broke repaired rebuilt and tuned again a lot of JZ's, M engines, RB engines, UZ engines, SR engines. And there is no 'best' engine. All engines have their good points and their weak points. If it comes to RB v.s. JZ, then the JZ is definately better from factory but both engines can be tuned with the appropriate forged materials to very good levels.
If you look further, you'll find the 2UZ and 3UZ (vvti) engines which are very good (also forged materials needed) and the S2000 head design is just so freaking good. Then the Audi V8 engines (twin turbos) are very very potential as well.

[Lith]

Originally Posted by R33_GTS-t

I think the Falcon XR6 4.0I6 pisses on the RB26 and 2JZ. 1000rwhp on pump gas.

No, 2JZ pisses on those in stock form. You can get 1000whp with a built 2JZ or an RB26 and the 4litre Falcon motor can NOT hold that power on stock internals at all. And the motor the 4l comes in makes it all negligable.

I prefer the 1JZ/2JZ to the RBs myself - the reason I own the Skyline is the total package. In terms of 1JZ vs RB25 (the obvious comparison) I suspect the RB25 is a fair bit more efficient, I am only running 1bar but my car is making the power it seems that 1JZs seem to need 1.2+bar of boost to make. On the other hand, I'd probably be ok with pushing 1.4bar into an untouched 1JZ whereas I've chosen to have 1bar as a max on my RB25.

[SupraT71]

Originally Posted by metropolis

I second that. The highest engine out dyno cell power figure (on standard internals) i saw for a 2 jz was 699bhp

Anyone got that far on a standard internal RB26?

On a different angle the 2jz supra ran from 93-02 without any major changes, yet we have seen 3 different versions of the skyline in that time...

i think you need to update your information. The record for a Stock Bottom end 2JZ-GTE is 1017whp. And there are many out there over 800whp

i have a stock bottom end Supra and the most that i´ve been to is 650whp last summer. I will be pushing about 800-850whp next summer on the stock bottom end

Even the NA 2JZ-GE has been boosted over 600whp

i can´t really say which is the better engine though since i´ve only delt with the 2JZ-GTE and i don´t know the numers which the RB26DETT has achieved

but here are some facts about a few supras

Boostlogic/PM Performance 6-Speed Supra, 3.4 ltr stroker , GT55-91 has dynoed about 1533whp and best 1/4 mile time on lower boost was 8.75@165.5mph with a sub 1.4 60ft with a Stock gearbox, stock rearend, stock axles. 3600+lbs
YouTube - Boost Logic 6 spd 8.75@165.5

Boostlogic Auto Car has gone 7.75@186.57mph , Stock Axles, Stock Rearend
YouTube - BL 7.75

Ryan Woon , Stock 6-Speed getrag gearbox , stock axles, stock rearend, has gone 8.62mph and best trap 173.5mph 3550+lbs

[rasonline]

Doesn't Nicolas Kiesa run a stock bottom end on his RB26 with just over 800bhp?

[R33_GTS-t]

Originally Posted by rasonline

Doesn't Nicolas Kiesa run a stock bottom end on his RB26 with just over 800bhp?

He did at first but he's upgraded now.

The problem with this comparison is that the 2JZ's image has been boosted up by dumbasses who think a stock Esprit gearbox can reliably handle 500rwhp. Maybe the 2JZ is slightly better as stock but it won't reliably handle the 1000rwhp boasted on some forums, not in the British definition of the word 'reliably' anyway.

The foreign definition of 'reliable' can amount to it holding together for a couple of dyno runs or quarters. The same people run ceramic turbos at 1.4-1.6bar.

[SteveN]

Originally Posted by R33_GTS-t

He did at first but he's upgraded now.

The problem with this comparison is that the 2JZ's image has been boosted up by dumbasses who think a stock Esprit gearbox can reliably handle 500rwhp. Maybe the 2JZ is slightly better as stock but it won't reliably handle the 1000rwhp boasted on some forums, not in the British definition of the word 'reliably' anyway.

The foreign definition of 'reliable' can amount to it holding together for a couple of dyno runs or quarters. The same people run ceramic turbos at 1.4-1.6bar.

They a lot more reliable than your making out there.

Id trust a stock 2JZ at 600@wheels more than id trust an uprated RB26 at the same power TBH.

[R33_GTS-t]

Originally Posted by SteveN

They a lot more reliable than your making out there.

Id trust a stock 2JZ at 600@wheels more than id trust an uprated RB26 at the same power TBH.

Have you ran one of each until destruction?

[kaneda]

Pfft.

Everyone knows a stock B16C bottom end will hold more power than the 2JZ and RB26 combined.

[supdawg79]

^^^You're still alive?

[kaneda]

Yeah, I just don't post on SF anymore. Got tired of the politics. People keep asking me to come back though, LOL.

[supdawg79]

^^^That's good. My Supra is for sale. I'm moving into this neighborhood soon enough. You better be too!

[Lith]

Originally Posted by SteveN

Id trust a stock 2JZ at 600@wheels more than id trust an uprated RB26 at the same power TBH.

I wouldn't. I don't know anyone with a built 600whp RB26 who has had it fail, though I know of people with stock 2JZGTEs who have had them fail around that power level. I fully agree a 2JZGTE is hardier than a RB26DETT, but be a bit more realistic.

[kaneda]

Originally Posted by SupraT71

Even the NA 2JZ-GE has been boosted over 600whp

We had a dyno competition here in Texas back in October, I watched a stock bottom end 2JZ-GE make 3 pulls over 900 rwhp with a best of 970 rwhp with my own two eyes.