whats the difference between s1 and s2 rb25's

Post by **jrb92se** » Sun Jul 16, 2006 7:09 am

ok as the title states im asking what the difference between an rb25det stage 1 and stage 2 are is it like o.b.d or something ive been searching i cant find anything i just got the car im new to the rb and i must really sound like it thx guys

Post by **Joe** » Sun Jul 16, 2006 8:05 am

S2 are newer (late r33's)no igniter chip (each coilpack has one, vs 1 for all)other small electrical differences*rumor* the turbo has a steel exhaust wheel vs the standard ceramic. no proof tho.

Post by **BigPar** » Sun Jul 16, 2006 9:37 am

Kamin wrote:*rumor* the turbo has a steel exhaust wheel vs the standard ceramic. no proof tho.

Does anyone ever say anything about turbos off of S2's that blow up at high boost? I hear and see pics of blown turbos, but what are they from?

Post by **jrb92se** » Sun Jul 16, 2006 9:48 am

when i bought the car he told me it has a s2 rb25 thats why i wanted to know the difference; is there any thing that i can look for on the engine to be able to tell ?

Post by **BigPar** » Sun Jul 16, 2006 11:17 am

well, like above said, look on top of coil pack cover between the valve covers. Sitting on top in the back should be a box. If there is a box you have a Series 1, no box = Series 2. Also check the MAF sensor and plug. 3 prongs inside the MAF connection = Series 2, 5 prongs = Series 1.

Post by **jrb92se** » Sun Jul 16, 2006 12:05 pm

thanks man

Post by **jrb92se** » Wed Jul 19, 2006 2:13 pm

hey dude i was lookin at my engine and on top of the black plate in between the cam covers at the back there are four screw holes does that mean the coil you were speaking of was there and has been removed ?

Post by **Joe** » Wed Jul 19, 2006 2:42 pm

no, they used the same coilpack cover plate it just dosent have the igniter attached.

you have a series 2.

Post by **jrb92se** » Wed Jul 19, 2006 3:54 pm

your abilities far surpass mine ; i am humbled

Post by **pignosedRB** » Sat Sep 29, 2007 4:44 pm

Is this the box that would make it a series 1 your talking about this is similiar to the RB i just got

Post by **digzsublime** » Sat Sep 29, 2007 5:14 pm

Yes. That that "box" is the ignitor. If yours has it. You have a series 1.

Website · Post by **meet07** » Sun Sep 30, 2007 10:33 am

is there any benifit having a s1 or a s2, beside one being newer. Im assuming that there the same thing.

Post by **Cameron** » Sun Sep 30, 2007 11:09 am

is there anyway to relocate that ignitor?

Post by **Coolwhip** » Mon Oct 01, 2007 1:50 am

meet07 wrote:is there any benifit having a s1 or a s2, beside one being newer. Im assuming that there the same thing.

S1 motors share more common parts like coils and cas, compared to the S2 which have a different style.

You can relocate the igniter. Just extend the wires to where you want to place it.

Post by **RB'd SX** » Tue Aug 12, 2008 4:02 pm

is there any benifit having a s1 or a s2. does one have more hp than the other

Post by **TSL** » Tue Aug 12, 2008 4:09 pm

Joe wrote:S2 are newer (late r33's)*rumor* the turbo has a steel exhaust wheel vs the standard ceramic. no proof tho.

All RB25 turbos have ceramic exhaust wheels.

RB’d SX wrote:is there any benifit having a s1 or a s2. does one have more hp than the other

1. S2 is newer.2. No.

I see this is an old thread...

Post by **silviasgp06** » Tue Aug 12, 2008 9:20 pm

also s2 along with retaining the ceramic exhaust wheel, it also has a Nylon(super hard plastic) compressor wheel, turbo is still a time bomb around 1bar. The nylon wheel was though of to make for a fast spool but no ones really tested it.

s2 can only use s2 ecu's, and s2 coil packs, because of the ignition relocation.

you can use s2 ecu on s1 but never use a s1 on a s2. rumored to short out the ecu.

both series use the one Apexi RB25 PFC, neo need a different PFC

something different about the intake cam angle sensor too that should be noted when upgrading cams.

hmm thats all i think that hasnt been mentioned that i know about.

Post by **Neejay** » Wed Aug 13, 2008 4:02 am

Someone also said that the fuel rail is different.

"the S1 is 2 piece inlet tube to the fuel rail, the S2 is a single piece."

I haven't been able to confirm myself though.

Post by **Coolwhip** » Wed Aug 13, 2008 4:15 am

silviasgp06 wrote:also s2 along with retaining the ceramic exhaust wheel, it also has a Nylon(super hard plastic) compressor wheel, turbo is still a time bomb around 1bar. The nylon wheel was though of to make for a fast spool but no ones really tested it.

s2 can only use s2 ecu's, and s2 coil packs, because of the ignition relocation.

you can use s2 ecu on s1 but never use a s1 on a s2. rumored to short out the ecu.

both series use the one Apexi RB25 PFC, neo need a different PFC

something different about the intake cam angle sensor too that should be noted when upgrading cams.

hmm thats all i think that hasnt been mentioned that i know about.

I've ran a S2 on a S1 ECU and the car has been running all year.

I assume your speaking about the cam angle sensor on the exhaust cam gear. Late S2's use a different CAS drive unlike the earlier and S1 motors that use a star and half moon key way.

Post by **l0nestar** » Wed Aug 13, 2008 4:40 am

Post by **superspikky** » Sat Sep 06, 2008 8:50 pm

i know this thread is old but i thought it be nice for to add. that the TPS sensors are diffrent on S1 vs S2

Post by **tight240** » Sun Sep 07, 2008 7:10 am

ECU's are no different, you can use S1 on S2 and visca versa. The ignitors are built into the coils, so the coils are not interchangeable. Thats the main differences plus a few sensor's and plugs are different.

Website · Post by **meet07** » Sat Jan 15, 2011 10:20 pm

If you have a series 1 and want to use a series 2 long block, what is needs to be swapped besides the obvious intake manifold,turbo header,injectors,clutch yada yada? I know they both have diffrent CAS? Do the cams need to be swapped out as well?

Post by **StricNyne** » Mon Jan 17, 2011 11:14 am

well inj are the same, so is the CAS for me at least if u have the huge plastic cas than you need the metal one, but biggest differance is tps, maf ( i think), and 100 percent the coilpack setup, u need new coilsetup without ignitor you could rewire whole thing which idk if its ever been done or just go with a series 1 harness you already got and use series 1 coil packs. if your changing blocks, and they are complete, all u gotta change is the harness and the coils, i have done this over and over again on my setup (rb26 harness which uses series 1 coils, and the metal cas, i used on rb26 harness and a series 2 harness) now tps plug your on your own cause i have a q45 tb and tps and i dont run a maf since i am on a map sensor, arent you the guy with the clean a** red kouki with the vsxx ? that car is sick u got ne new pics ?

Post by **flatrate** » Thu Mar 17, 2011 8:54 pm

so will a series 2 CAS bolt on and plug in to a series 1 engine granted the series 1 engine has series 2 cams?

I have a good deal on a set of cams but there for series 2

Post by **flatrate** » Fri Mar 18, 2011 7:15 pm

TTT anyone

Post by **Mfox** » Tue May 31, 2011 9:03 am

From my research and informant conversations from importers alike. The s1 and s2 engines are exactly the same, internal-wise..... The only thing that changes is the electrical bolt on components in the way it ignites combustion and how its read.

Post by **Coolwhip** » Wed Jun 01, 2011 10:19 am

correct

Post by **Marahutay** » Fri Jan 13, 2017 7:46 pm

Hey guys, I came across this thread from a Google search about the difference between the CAS on the series 1 and 2 longblocks, and I want anyone else who ends up here to know that the cams are not interchangeable due to the crank angle sensor. If you plan on ordering aftermarket cams make sure they match up with what series motor you have/the CAS you have.
Sorry if I'm breaking rules ressurecting such an old post but I know I can't be the first person who has ended up here from a Google search.

whats the difference between s1 and s2 rb25's

whats the difference between s1 and s2 rb25's

Re: whats the difference between s1 and s2 rb25's (jb96s14)

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Re: whats the difference between s1 and s2 rb25's (Joe)

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Re: whats the difference between s1 and s2 rb25's (silviasgp06)

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Re: whats the difference between s1 and s2 rb25's (superspikky)

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Re: whats the difference between s1 and s2 rb25's

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