Post pics of your ride(s)!
The RB25 is plenty for your power goals. Quite a few people have gotten over 500rwhp on pump gas with them on stock bottom ends. Not to mention the sweet sound the RB's make. It's a good swap idea. I'd love to do a 1.5jz or RB26 swap in my FD if it wasn't going to throw the weight of the car off. Boosted small displacement engines are where I first got into modding in the first place. Hard to let go of that world.
I disagree on the rotary being the engine swap ***** that you claim it to be though. Infact, I'd say the SBC is the premier swap of choice that is in every application you can think of(even crossing many car platforms). The one thing the 20b would give you, is uniqueness. If that's your ultimate goal, then go for it. If we all drove the same cars, with the same engines, the same wheels, the same body kits, the same type of racing, etc. we'd be pretty boring wouldn't we?
I disagree on the rotary being the engine swap ***** that you claim it to be though. Infact, I'd say the SBC is the premier swap of choice that is in every application you can think of(even crossing many car platforms). The one thing the 20b would give you, is uniqueness. If that's your ultimate goal, then go for it. If we all drove the same cars, with the same engines, the same wheels, the same body kits, the same type of racing, etc. we'd be pretty boring wouldn't we?
Wangan Nasty
Joined: Apr 2006
Posts: 1,779
Likes: 3
From: Irvine, Southern California
The RB25 is plenty for your power goals. Quite a few people have gotten over 500rwhp on pump gas with them on stock bottom ends. Not to mention the sweet sound the RB's make. It's a good swap idea. I'd love to do a 1.5jz or RB26 swap in my FD if it wasn't going to throw the weight of the car off. Boosted small displacement engines are where I first got into modding in the first place. Hard to let go of that world.
Most people in japan, and australia where they have higher octane pump are making 400-450 whp with upgraded turbos or fully maxxed out stock turbo (ticking time bomb because it's a ceramic exhaust wheel).
The limit for the RB26DETT on stock ceramic turbos, 91 **** gas on 1.1 Bar of boost and all bolt ons with full standalone, upgraded 2x Bosch Fuel pumps, Twin Z32 MAFs, is around 440 whp with upgraded injectors of course. This is reliable, beatable power. Past 450 horsepower: Metal Head Gasket is required. Stock Crank is good to 550 horsepower if fully balanced AND prepped (deburr,polish,shot peen,balance: OEM is NOT). Stock Rods and Rod Bolts on an RB26 are good to 650 whp if prepped (read above). RB25 tolerances are MUCH less than a 26.
This is reliable, not once an engine on a lease. People have made more power, but the engine's dont last. These are numbers and information from people here in the states, japan, and other nations who eat, breathe, and **** skylines.
It takes MUCH deeper pockets to modify an RB than it does a Toyota Turbo JZ Series as the engines are built to much higher tolerances, and since the engines are directly swapable into Lexus SC's or A70 Supras, parts are more available hands down. Long run funds spent, a reliable, higher horsepower toyota 6'er is cheaper and more bombproof. Not to mention if you go the 2jz-gte + R154 route you can have a CARB legal swap.
To swap an RB25 you are looking at an R33 GTS-T RB25DET Gearbox along with the RB25DET, and some sort of decent engine management if you want to upgrade the damn thing at all, + a couple other things. An R33 GTS-T Gearbox bolts on an RB26DETT also.
They go for about 2000-2500 for a GOOD condition one (I.E: No overtorqued heads, ground cam journals, etc). For that price i can get you a full RB26DETT Longblock with everything included.
I even know a good one for sale right now. If you want to run higher than stock on 91 pump gas you need either a good ROM Tune or a Standalone to manage everything.
Don't even think of running a POS piggyback on these engines for proper engine control and reliability.
Don't mis-inform people.
Last edited by Miata_mx5; Dec 26, 2008 at 01:16 AM.
Wangan Nasty
Joined: Apr 2006
Posts: 1,779
Likes: 3
From: Irvine, Southern California
I was just getting at the fact that the RB25 is not going to be some cheap hooker to build reliable and fast. For the money involved, you are better off with a 26 AT LEAST.
Last edited by Miata_mx5; Dec 26, 2008 at 01:28 AM.
Senior Member
Joined: Nov 2005
Posts: 392
Likes: 1
From: los angeles
