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Engine Tech Technical discussion related to all relevant engines such as KA, SR, RB, CA, 2JZ , L24/26/28, VG, VQ, and LSx series. |
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03-01-2011, 07:23 PM | #721 |
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didn't want to create a new thread about this so decided to post it here.
Im going from an rb20 to an rb25. What parts would i need that are not the same on the 20? What modifications would i have to make? will the radiator fit the 25? will the rb20 transmission bolt on the 25? thanks a lot. |
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03-01-2011, 07:26 PM | #722 | |
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03-01-2011, 07:55 PM | #723 | |
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yeah, i already upgraded to an aluminum one. so basically i would just have to do the engine harness for the 25? i am upgrading because i started drifting and want to reach around 360+ whp in order to stay competitive in my country. Rb20 is a bit sluggish and an old motor. in what motor would be easier to achieve 360+ whp with more reliability rb25 or sr20? |
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03-01-2011, 09:19 PM | #724 | |
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The mount kit should work still. Honestly, I would choose the rb25. But that is because I absolutely hate Sr20's. I would choose a Ka-t over an sr20 any day. But, the rb25 and sr20 can achieve 360+ whp easily. I'm not sure what the sr20 internals are rated at but you would be fine with stock internals on the rb25. Sr20's might need to be up'd to forged(not an sr freak). With a basically stock Rb25 with FMIC, Greddy style intake, AFPR, walbro fuel pump and a proper tune I could see close to 300 hp if not more on 9-10lbs of boost. The rb turbo can handle that, but no more. If you plan to run anymore boost I would recommend a new turbo. I have been looking at the Hyper gear turbo's since they are a 100% drop in for the Rb25det so you won't need to make piping work, and they range from 450hp-around 800hp. For now I am going to pick up a hyper gear turbo and run low boost. Also to remember that the Maf can only read up to 310hp-340hp(not 100% sure but close to this) So either a new maf or standalone would be needed. To wrap it up, you don't need 360hp+ in order to stay competitive.(unless your in FD,then you will need 1000hp v8's haha.) People drift just fine with stock sr's, ka's,rb's. As long as your suspension is gone through(I assume it has been since your trying to stay more competitive).
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03-01-2011, 10:49 PM | #725 | |
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i have the z32 maff already and if i go rb25 ill probably end up gong stand alone (power fc). isn;t the 25 going to mess up the weight distribution of the car,(i have a hatch) Hows does the car feel with the heavy motor up front? i was also looking at the hyper gear turbos, they are super interesting. They are kind of expensive but i guess that it will be less expensive at the end when you do not have to buy another manifold or other pipings. thanks for all |
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03-01-2011, 11:58 PM | #726 |
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rb20det vs rb25det
i see that the rb25 price dropped a little bit as well as the rb20. average for the rb25 is about $2000 for the full swap and about $12-1300 for the rb20. what do you guys think? invest a little more and get the rb25? or save a little and get the rb20 and invest the rest of the money on upgrade partS? and i couldnt find this any where... whats the max hp a rb20 can push on how much boost stock??
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03-02-2011, 12:12 AM | #727 |
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the rb20 can push around 250whp on about 12 psi of boost. (thats really pushing stock turbo)
it depends on what you want the car for. but IMHO i would invest in the rb25. more aftermarket support and around stock it can reach around 280-300 hp. thats just my opinion. |
03-02-2011, 12:18 AM | #728 |
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mmmmm icic.. im savin up for a s13 hatch shell right now.. and i was thinking rb20 and as i was shopping i noticed the price dropped for the rb series. thought rb25 would be like 3500.. lol..i guess im wanting to push enough to beat my friends acura tl six speed.. hahaha my is300 5speed manual cant beat it. lol
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03-02-2011, 12:41 AM | #730 |
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well.. like i said.. i couldnt find it.. please do share if you know the information that im looking for.. instead of just telling me that this topic has been covered.. im really wanting to know lol
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03-02-2011, 11:21 AM | #731 | |
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Honestly the rb25 doesn't weigh much more then the rb20, I think it's like 75lbs+. I would go rb25 since the rb20 is outdated and harder to find parts for. I think the Journal bearing hyper gear is a good deal. For the 450hp it's like $1500. I would love the BB one but I can settle for the journal. I planned to pick one up since I don't really want to buy a new turbo outlet. My skyo one was enough.
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03-02-2011, 06:03 PM | #732 |
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thnks smoked! you pretty much answered all my questions! yeah.. i dont think i would go over 10psi until i do some upgrades.. and i was also worried about the rb20 parts being so rare. even if i do spend less and try to upgrade some parts, it will be hella hard to find parts for it. the rb25 neo is still freakin pricey.. but the 1st gen is ok price. i just need to save.. i spent to much on my is300. thinking i was gonna do a 2jz swap.. but i ended up finding a really nice 240 shell and changed my mind about the 2jz wanna keep my is300 as daily and start a project lol thanks smoked240 again
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03-02-2011, 07:05 PM | #733 | |
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No problem man. I would recommend either the S2 rb25det or the neo. The S1 and S2 are the same price, I think it's better to have the built in ignitor's. I recommend Zerolift for the engine. Robert has great prices, and he's a great seller.
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03-04-2011, 02:49 PM | #734 |
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m guessing s1 and s2 would be the series of the engine.. i know the neo is that latest version. if im guessing right s1 is without the variable timing control and s2 is with it?
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03-04-2011, 03:21 PM | #735 |
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Negative, all RB25's have VTC (variable cam timing on the intake cam). S2 motors (including Neo motors) have different coilpacks and Neo's have slightly different turbos, as well as different ECU's and slightly different wiring. They're all close enough.
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03-04-2011, 03:50 PM | #736 | |
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This. I really like the S2 for having there own ignitor's. Also, I am not sure but don't the S1 and S2 turbo's differ slightly? Or are they the same?
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03-04-2011, 10:59 PM | #737 |
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03-05-2011, 02:51 AM | #738 |
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What he means is the S2 coilpacks don't need the separate igniter. I don't see the big deal, the igniter is the same as Z32s so they're cheap, and it's easy to rewire to throw it inside the car.
I built my S1 and have built customers S2's and harnesses for Neo's, I don't see enough being better to justify the cost increase. You're going to replace the turbo if you're serious anyway, and the igniter is a virtual non-issue. What, you want the cute Neo valve cover?
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03-05-2011, 02:59 PM | #740 | |
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03-05-2011, 03:03 PM | #741 | |
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Yup. Your rb25 wastegate will work just fine, just get a boost controller. But I would keep it around 10lbs.
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03-08-2011, 07:43 PM | #743 | |
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they all they same
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03-08-2011, 08:01 PM | #744 | |
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If I have any problems with my Coilpacks I am just going to order a set of Spitfire anyways. It was some work tracking down my Maf for the S2 but I got a great deal on it.
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03-08-2011, 08:45 PM | #745 |
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I have looked through this post almost inside and out, just wondering if anyone has any guides, and great PDFs to help me with my 97 Kouki to Rb25det S1 swap.
Also quick question, I am running a m24 ar .60 HKS turbo slightly biggar and stronger then the stock. What would be the boost rating for a turbo like this? Ei: 10 psi = 250 hp type thing? Any help and suggestions would be awesome. And if anyone has extra parts PM me!!
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03-08-2011, 09:30 PM | #746 |
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^^^ Chad, what part of the swap are you having trouble with? Wiring?
You should be able to run the HKS turbo up to 10psi or so without any problems, you'll run out of MAF/injector shortly after that I think.
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03-11-2011, 12:51 PM | #748 |
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Ok so im in the market for a RB swap into my coupe, i live in socal and would like a good that can do this swap with a reasonable price. If any of u do swaps or know of a good place please send me the info.
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