RB25, RB20, or SR20?
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whiterps13
- Posts: 4217
- Joined: Sun Jul 27, 2003 9:45 am
- Car: white LE hatch
RB25, RB20, or SR20?
Hi, I own a '92 240sx Hatchback and want to do a swap. I cant decide between an rb20, rb25, or sr20. I think I want to swap it myself, but might need a shop to do it. Could you guys give me some pros and cons on the swap, the oem and aftermarket support, the specs, and the reliability? BTW, it is a daily driver. Thanks for the help.
you really should search like Nismo said but I am gonna give you a quick OPINION! Don't take it as gospel cuzz what do I know???
My opinion is this.....If you have a little extra money, go with the RB25...thats what I am getting (trying terribly to RECEIVE)
I've been thinking that the RB20 could possibly be a mucher better chouce than the 25 for a # of reasons..
1) Costs less2) Revs Higher3)Less new parts needed for install {driveshaft mainly}
An SR20 would probably be the cheapest choice with the cleanest install since it can fit the KA's mounts and I believe uses the same driveshaft. The RB20 and Sr are said to have about the same ammount of potential before internal work has to be done.
So as I see it...
If you have the cash go with the Rb25.
If you like to Rev go with the Rb20
If you want an easier install with about a smuch potential and a LOT more aftermarket support go SR
My opinion is this.....If you have a little extra money, go with the RB25...thats what I am getting (trying terribly to RECEIVE)
I've been thinking that the RB20 could possibly be a mucher better chouce than the 25 for a # of reasons..
1) Costs less2) Revs Higher3)Less new parts needed for install {driveshaft mainly}
An SR20 would probably be the cheapest choice with the cleanest install since it can fit the KA's mounts and I believe uses the same driveshaft. The RB20 and Sr are said to have about the same ammount of potential before internal work has to be done.
So as I see it...
If you have the cash go with the Rb25.
If you like to Rev go with the Rb20
If you want an easier install with about a smuch potential and a LOT more aftermarket support go SR
Im also wondering this. Theres a lot of info on these forums that confuse me. Some say the RB 20 is not worth al the hassle and stuff. What hassles are they talking about? the only problem that i know of is the crossmember and mounth problems. Also the wiring and thats about it. Even heard its less tunable ( i guess compared to an SR or KA) Im only talking about the RB20, yea we all know the RB25 is the way to go, but damn where can u find one for a good price.
Other people say the RB20 and SR are the same swap and both run out of power at the same level, without internal work. Now i hear a lot of people on this boards going RB20 because of price and other factors. How is your RB20 working to all the people that have the swap in their ride. I was really going with the RB20 but reading a lot of those old threads made me skeptical and thinking of going SR.
Other people say the RB20 and SR are the same swap and both run out of power at the same level, without internal work. Now i hear a lot of people on this boards going RB20 because of price and other factors. How is your RB20 working to all the people that have the swap in their ride. I was really going with the RB20 but reading a lot of those old threads made me skeptical and thinking of going SR.
The RB swap wasn't that bad really. This was the 1st swap I've ever done, and up until the swap the biggest thing I had done to a car was install some underdrive pulleys.
My RB is running great except for a misfire that still bugs me above 6000 rpm sometimes. I'm trying to get my hands on some used coil packs though to try and sort that out.
My RB is running great except for a misfire that still bugs me above 6000 rpm sometimes. I'm trying to get my hands on some used coil packs though to try and sort that out.
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PROJECTRB240SX
- Posts: 3673
- Joined: Fri Jun 13, 2003 5:33 pm
- Car: 1972 DATSUN 240Z W/ SR20DET
HERE'S ALITTLE LO-DOWNSR20: WAY TO OVER PRICEDRB25: HIGH OUTPUT-HIGH PRICERB20: GREAT PRICE AND WITH THE EXTRA CASH YOU CAN REBUILD THE ENGINE AND HAVE AN ENGINE WAY STRONGER THAN THE RB25 AND STILL HAVE SPENT A LITTLE LESS THAN BUYING THE RB25.
THERE IS A STICKY AT THE TOP THAT HAS PLACES TO GET RB SERIES PARTS, SO YOU CAN SEARCH THERE FOR AFTERMARKET SUPPORT. THERE ARE ALMOST NO COMPLICATIONS WHEN AN RB20 GOES INTO A S13. THERE IS MORE ROOM IN THE S13 THAN THE R32, THE CROSSMEMEBER IS INTERCHANGABLE SO THERE ARE NO MOUNTING ISSUES. OHH WELL DO ALITTLE MORE SEARCHING (NOT TO SOUND LIKE A ****, CAUSE I HATE WHEN PEOPLE JUST SAY SEARCH) CAUSE NOT ONE PERSON ON HERE IS GOING TO HAVE ALL THE ANSWERS AND YOU CAN DEFINATLEY FIND EVERYTHING YOU SEEK TO KNOW.
THERE IS A STICKY AT THE TOP THAT HAS PLACES TO GET RB SERIES PARTS, SO YOU CAN SEARCH THERE FOR AFTERMARKET SUPPORT. THERE ARE ALMOST NO COMPLICATIONS WHEN AN RB20 GOES INTO A S13. THERE IS MORE ROOM IN THE S13 THAN THE R32, THE CROSSMEMEBER IS INTERCHANGABLE SO THERE ARE NO MOUNTING ISSUES. OHH WELL DO ALITTLE MORE SEARCHING (NOT TO SOUND LIKE A ****, CAUSE I HATE WHEN PEOPLE JUST SAY SEARCH) CAUSE NOT ONE PERSON ON HERE IS GOING TO HAVE ALL THE ANSWERS AND YOU CAN DEFINATLEY FIND EVERYTHING YOU SEEK TO KNOW.
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McAdam
- Posts: 423
- Joined: Mon Feb 17, 2003 10:33 pm
- Car: I like cars and my motorcycle. boats are fun too
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I have first hand experience at the RB20 install. It was actually quite easy. hell, for the $1900 it took to get the RB20DET and have it shipped to the front door, it was an excellent price! I am thinking the RB20 will handle more stock HP than the SR20. I say this because it is spreading the HP out over 6 cylinders as opposed to 4. It goes right in to the 240sx, all you have to use is the Skyline front cross member, which is 6 bolts and its in. Not a big deal.
hassles of RB20 install.
1. your tach won't work. (easily remedied with an aftermarket one)2. Your temp gauge wont work (not enough time to figure out the wires on the one I did)3. have to cut hole in engine bay to fender for IC pipes (will have to do this for ANY turbo engine)4. Wiring. it took a few hours to sort, but not that bad at all. (SR and RB25 will need wiring issues too)5. Down Pipe rubs ever so slightly on the steering shaft knuckle6. Have to use and wire in electric fans. (just a good idea on any engine if you want more HP)7. have to "trim" hood to get it to shut. otherwise, stays on first safety click.
Ease of the RB install.
1. Front clip crossmember bolter right in, motor mount problem solved. 2. drive shaft mated right up.3. used KA lower harness for starter and alternator, spliced RB plugs onto harness for transmission switches.4. transmission mount bolted straight on.5. RB downpipe to catalytic converter exhaust pipe bolted right on to the KA cat.6. engine dropped RIGHT in. fit like it was meant to be there. Email me if you need pics.7. Power Steering lines for SOHC KA had enough sslack to goto RB pump.8. AC compressor only needs a line about 3 inches longer, and it too will bolt directly on.
well, thats all I can think of. Email me if you have any questions or want to know anything about the swap.
McAdam
hassles of RB20 install.
1. your tach won't work. (easily remedied with an aftermarket one)2. Your temp gauge wont work (not enough time to figure out the wires on the one I did)3. have to cut hole in engine bay to fender for IC pipes (will have to do this for ANY turbo engine)4. Wiring. it took a few hours to sort, but not that bad at all. (SR and RB25 will need wiring issues too)5. Down Pipe rubs ever so slightly on the steering shaft knuckle6. Have to use and wire in electric fans. (just a good idea on any engine if you want more HP)7. have to "trim" hood to get it to shut. otherwise, stays on first safety click.
Ease of the RB install.
1. Front clip crossmember bolter right in, motor mount problem solved. 2. drive shaft mated right up.3. used KA lower harness for starter and alternator, spliced RB plugs onto harness for transmission switches.4. transmission mount bolted straight on.5. RB downpipe to catalytic converter exhaust pipe bolted right on to the KA cat.6. engine dropped RIGHT in. fit like it was meant to be there. Email me if you need pics.7. Power Steering lines for SOHC KA had enough sslack to goto RB pump.8. AC compressor only needs a line about 3 inches longer, and it too will bolt directly on.
well, thats all I can think of. Email me if you have any questions or want to know anything about the swap.
McAdam
I hope a loarge portion of that transfers over to an RB25, assuming it ever comes I managed to get the tach from the R32 cluster to fit into my KA cluster. A bit of trimming of plastic here and there, and some black filler material to keep light from showing through the bit of excess space around the tach at night. If you're going for a show car this isn't the best solution but it's very functional and freeMcAdam wrote:1. your tach won't work. (easily remedied with an aftermarket one)
Quote »2. Your temp gauge wont work (not enough time to figure out the wires on the one I did)[/quote]My temp gauge in my KA cluster works fine. All it involved was splicing the temp sensor wire off the RB ECU Harness into the KA chassis harness that goes to the gauge cluster.Quote »5. Down Pipe rubs ever so slightly on the steering shaft knuckle [/quote] Easily fixed with a grinder How was the fit using the R32 crossmember? i hear it comes a little off and doesnt clear for sway bars unless u modify your oil pan. Im thinking of buying the mounts to have a clean engine bay and also have room for stiffneng goodies.
Is there any defenitive dissandvantages for the RB20? I hear that torque is a problem from some of the R32 ausie forums.
Is there any defenitive dissandvantages for the RB20? I hear that torque is a problem from some of the R32 ausie forums.
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PROJECTRB240SX
- Posts: 3673
- Joined: Fri Jun 13, 2003 5:33 pm
- Car: 1972 DATSUN 240Z W/ SR20DET
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PROJECTRB240SX
- Posts: 3673
- Joined: Fri Jun 13, 2003 5:33 pm
- Car: 1972 DATSUN 240Z W/ SR20DET
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PROJECTRB240SX
- Posts: 3673
- Joined: Fri Jun 13, 2003 5:33 pm
- Car: 1972 DATSUN 240Z W/ SR20DET
HERES A LONG SHOT BUT I'LL TRY; DO YOU HAVE ANY COMPLETE RB25 OR RB26 BLOCKS FOR SALE? I MAINLY WANT THE RB26 BECAUSE OF THE BETTER OIL PUMP BUT EITHER WILL DO. IF YOU DO HOW MUCH? DROP ME AN EMAIL AT [email protected]
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PROJECTRB240SX
- Posts: 3673
- Joined: Fri Jun 13, 2003 5:33 pm
- Car: 1972 DATSUN 240Z W/ SR20DET
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PROJECTRB240SX
- Posts: 3673
- Joined: Fri Jun 13, 2003 5:33 pm
- Car: 1972 DATSUN 240Z W/ SR20DET
-
PROJECTRB240SX
- Posts: 3673
- Joined: Fri Jun 13, 2003 5:33 pm
- Car: 1972 DATSUN 240Z W/ SR20DET