Opinions Rb20 or 25

[Adz2332]

Hey all

I have a 32gtst and i was planning on putting a rb25 in it.

At the moment it has the 20 and is around 170kws and i just feel its lifeless and gutless. The plan was to chuck in a rb25 but then i have toi take it through regency and get it checked, plus upgrade a few things to get it through. is it worth it?

If both engines chucked out say 250kws, will you notice much difference between engines? Its all im looking at for a daily weather it be the 20 or 25. 

Just dont know if its worth the hassel as im building a 25/30 at the moment for the track car and i just cant be stuffed!!

[niZmO_Man]

My opinion is do a search.

Or throw a NEO6 in.

[Adz2332]

im more after will i notice enough diff from a 20 to a 25 putting out roughly the same kws to make the swap over worth it. as i already have a 25 bottom end im not using etc

[jmknights93]

You'd find those answers right here on the forum from other build threads.

I agree with @niZmO_Man however. A NEO would be the ideal conversion with lots of room for improvement with extra bolt on goodies.

[GTSBoy]

For a daily, driving in traffic, the 250kW point is totally non-relevant.  What matters is bottom end torque.  The 20 has none, the 25 has some.

That's why I did a 25Neo transplant into my 32.

[Adz2332]

fair point...

remember also being disappointed with my sr20 in the 180

[jmknights93]

SR & RB two totally different platforms lol.

[Dose Pipe Sutututu]

RB25DET NEO, put in ARP2000 studs, slap on a GTX3576 on a TS manifold with divided 0.83 rear housing + all supporting BS.. make 400kW+

[r32-25t]

The sr20 is better then the rb20 and the rb25 is better then the sr20. Therefore potato 

but the rb25 conversion is the best thing you can do to an r32 gtst

[CEF33Y]

The difference between my cefiro (230-240rwkw RB20) and my daily (Stock RB25DET R33 sedan) is huge, on the street.

Cefiro needs revs, and lots of them. It is laggy.

R33 feels like its on boost instantly, comparably, obviously with less up top, which, as GTSboy said, is where it counts for a street car.

Then I drive the missus TT 300ZX and wonder what the F*%k I'm doing with an RB20

Haha.

All depends what you like. I don't really mind the lag, can still putt around off boost, and is fine for the track (drifting). Would piss me off if I had to drive it in traffic everyday though.

 

 

 

 

[Scott Black]

RB25DET NEO, put in ARP2000 studs, slap on a GTX3576 on a TS manifold with divided 0.83 rear housing + all supporting BS.. make 400kW+

Destroy the oil pump from one of there many issues to you throw a rod threw the block and destroy everything.

[Dose Pipe Sutututu]

Too much timing bent a rod? Haha

I always relax on the timing peak torque to keep these stock RBs together. Been doing 370kW on mine for some time, prior to that a good 330kW. 

Head gasket is going though, must have screwed it prior through ARP studs. Do about 4 to 5 hard laps and you'll lose coolant.

[Chris32]

My old 32 was my daily for 6 years, running 200 odd for most of that time

If you can get a 2530 or similar turbo (I had a 2510) and set it up to run 18-20psi it's not overly laggy and provides good top end

During the same time I had 2 mates with 33's making similar peak power and the extra cc's plus the vct made them a much quicker car everywhere

If I was my car, being a daily I'd go rb25. Even with a stock turbo setup making 200kw it would be a quick daily

[niZmO_Man]

RB30E is where it's at for daily driving

In saying that, my stocker RB20 R32 with R34 turbo was a good daily drive, albeit slow, unless I revved it out.
Was averaging 9L/100km because in traffic, no boost until 3,000rpm + slow moving = long boring drives to work and home.

In saying that, NEO6 turbo is a much better drive and decently efficient as well (a relo of mine put one in his R31). RB30 with NEO head even more so haha.

Since your other cars have higher powered engines, put a V8 in your R32.

[Scott Black]

More the oil pump has the same crank nose issue on the neo as early 25s and end up with no oil pressure and a dead motor. No tune is going to help that, conservative driving will yet no fun in that. Pointless doing up what's a potential hand grenade without fixing oil control issues first.

[GTSBoy]

Yuh, but Jonny dose-a-holic is a subscriber of the blow-it-up-and-slip-another-stock-engine-in school of thought.  Play engine roulette.  Sometimes you win for ever.  Sometimes you lose in a week.  If you lose, you spend another grand and have another spin.

The alternative is to open the engine, let all the Nissan out and spend $5k putting expensive parts inside.  Different sort of roulette.

[admS15]

Yuh, but Jonny dose-a-holic is a subscriber of the blow-it-up-and-slip-another-stock-engine-in school of thought.  Play engine roulette.  Sometimes you win for ever.  Sometimes you lose in a week.  If you lose, you spend another grand and have another spin.

The alternative is to open the engine, let all the Nissan out and spend $5k putting expensive parts inside.  Different sort of roulette.

I'm also in the, if it ain't broke don't fix it school of thought. Why spend big $ on something that "may" happen. RB25's aren't exactly rare and there's no premium a week before race wars either:). Plenty of guys out there pushing decent power and tracking stock RB25's without issue. Obviously drift guys sitting on the limiter constantly are more likely to have problems.

Back on topic the OP asked about. A 25 will be better in every way as a daily and 250rwkw will be childs play for it. The low end torque and response being the major difference. Keep the Nissan in and keep smiling[emoji106]

[WMDC35]

I'm also with the boosting stockers, although they're getting harder to come by & the price is going up over here.

25 is a lot better for daily driving.

[iruvyouskyrine]

I'm more of a fan on a 25 head on a 30 bottom end. Bottom end only costs $50 not $1000

[admS15]

I'm more of a fan on a 25 head on a 30 bottom end. Bottom end only costs $50 not $1000 [emoji4]

If I had to replace an engine. This would be my preferred option too.