200sx RB 25 CONVERSION

I dont know the S13 Q's but i can answer the Tacho is a universal converter that Rezlo gets in,Works on all motors,Converts the 4 pot signal to 6 pot ,Cost was just over R1000 when i bought mine.
Works perfectly and is very easy to install.

ljS14 wrote:

I dont know the S13 Q's but i can answer the Tacho is a universal converter that Rezlo gets in,Works on all motors,Converts the 4 pot signal to 6 pot ,Cost was just over R1000 when i bought mine.
Works perfectly and is very easy to install.

Thanx that helps me a lot much cheaper and easer to get.

antman wrote:

Hi Reyn S, thanks for the info. a few more questions if I may....so if I understand correctly your s13 speedo worked properly when you fitted the ca18 speedo drive assy? The converter you speak of, do you have a link and a cost of it? Did you use the s13 cross member or the r33 one? Can the s13 diff be used in the rb conversion, are the ratios ok for road use? Are there any front suspension issues with the heavier rb, will stock front springs be ok or will it have to be coilovers?
Sorry for the 20 questions .....thinking of not going the sr route anymore but rather go with the rb25 and would like to iron out any potential problems.
Thanks

No its cool will help were I can.

Yes the speedo gear is the same and the speedo works 100%
I dont have a link any more but read what ljs14 wrote.
I used my S13 cross member and made new engine mountings to fit on the cross member.
I am running my standard diff no problems but in 5th gear on 240km/h it feels like it needs a 6th gear. The propshaft needs to be shortened and a new universal slip joint in the front going to the box.
I am running my stock suspension and i have a 60mm drop in the front and 55mm at the back it is a very bumpy ride i am getting coilovers in this month.
I am glade I went the RB way the only problem I have is heating problems but Im going to sort it out with a 4 core radiator I am currently running a 3 core BMW with 2 12" fans. The over heating only happens when I am doing hi speeds on hi revs for a long period of time.
I will post sum pics of my mountings and so.

here is some pics of my swap

before RB swap

CA18 out

Motor + gearbox

Making ready to fit motor + gearbox to make mountings.

making mountings

almost ready for spray

gearbox mountings

motor and box in

Cleaning up motor and box

After cleaning and refit

making fan mountings

this is the end result

antman wrote:

Hi skylow, are you still going the rb route...did some searching and it seems not too difficult...major problems are engine mounts if you use the s13 cross member...the gear box mount needs to be modded to fit as well as the prop shaft to be modded.... the worst prob for me is cutting the bonnet reinforcement to clear the motor. One other problem I think would be the calibration of the speedo, anyone got a work around on this?

you dont have to cut anything on the body

Thats impressive, the motor after the polishing came out tops....
looks really good with the Greddy intake which I think is a must for this conversion. Is your motor standard, turbo, injectors, ecu etc?
I posted some time back on getting a SR20det front clip and my agent was not able to get a good one when he was over there and have now decided to get a RB front clip instead. I will use the r33 crossmember, loom,ecu and radiator and run it stock standard as my sx is my every day car, dont want to regret not going RB. As for the rev counter the front clips come with the cluster so maybe I can swop out the rev counter guts into the sx cluster...will see. I will try and get the r33 diff as I would like to keep the gearing std.
Thanks again

Can your engine mount further back?

antman wrote:

Thats impressive, the motor after the polishing came out tops....
looks really good with the Greddy intake which I think is a must for this conversion. Is your motor standard, turbo, injectors, ecu etc?
I posted some time back on getting a SR20det front clip and my agent was not able to get a good one when he was over there and have now decided to get a RB front clip instead. I will use the r33 crossmember, loom,ecu and radiator and run it stock standard as my sx is my every day car, dont want to regret not going RB. As for the rev counter the front clips come with the cluster so maybe I can swop out the rev counter guts into the sx cluster...will see. I will try and get the r33 diff as I would like to keep the gearing std.
Thanks again

cool man.
I am still running standard turbo and injectors, Im running Dictator and boosting 0.4 for every day use doing 200kw and 300nm and if i want to run hard i boost it 1.1 on 105 gas doing 260kw and 457nm

Reyn S wrote:

antman wrote:

Thats impressive, the motor after the polishing came out tops....
looks really good with the Greddy intake which I think is a must for this conversion. Is your motor standard, turbo, injectors, ecu etc?
I posted some time back on getting a SR20det front clip and my agent was not able to get a good one when he was over there and have now decided to get a RB front clip instead. I will use the r33 crossmember, loom,ecu and radiator and run it stock standard as my sx is my every day car, dont want to regret not going RB. As for the rev counter the front clips come with the cluster so maybe I can swop out the rev counter guts into the sx cluster...will see. I will try and get the r33 diff as I would like to keep the gearing std.
Thanks again

cool man.
I am still running standard turbo and injectors, Im running Dictator and boosting 0.4 for every day use doing 200kw and 300nm and if i want to run hard i boost it 1.1 on 105 gas doing 260kw and 457nm

that is awesome numbers for 0.4 you must have some other mods to get that. the std rb25 does 150rwkw at 0.4 unless you talking about at the fly which is about right

Charlvdw wrote:

Can your engine mount further back?

Yes it can, but then it gets hard. The sump is mm’s in front of the cross member. I will have to lift the motor and then have to cut in the bonnet or I have to remove the sump and modify the sump not to touch against the cross member. Then you will have to cut in the tunnel for the gearlever because it won’t line up and that means the plastic cover going over the radio, will have to be modified as well or you can fit the smaller box.

rat wrote:

Reyn S wrote:

antman wrote:

Thats impressive, the motor after the polishing came out tops....
looks really good with the Greddy intake which I think is a must for this conversion. Is your motor standard, turbo, injectors, ecu etc?
I posted some time back on getting a SR20det front clip and my agent was not able to get a good one when he was over there and have now decided to get a RB front clip instead. I will use the r33 crossmember, loom,ecu and radiator and run it stock standard as my sx is my every day car, dont want to regret not going RB. As for the rev counter the front clips come with the cluster so maybe I can swop out the rev counter guts into the sx cluster...will see. I will try and get the r33 diff as I would like to keep the gearing std.
Thanks again

cool man.
I am still running standard turbo and injectors, Im running Dictator and boosting 0.4 for every day use doing 200kw and 300nm and if i want to run hard i boost it 1.1 on 105 gas doing 260kw and 457nm

that is awesome numbers for 0.4 you must have some other mods to get that. the std rb25 does 150rwkw at 0.4 unless you talking about at the fly which is about right

no other mods but yes that’s on the fly on the wheels its 170kw on 0.4 and 240 on the wheels on 1.1.

at least someone has confirmed what power i will be making once the RB project is done

Hey Reyn S, did you have any issues with the clutch master cylinder? seems that one of the okes on the SXOC forum had to replace his master cylinder with a VR6 one as the inlet manifold clashed. Maybe it was because his motor is really far back.
Thanks again

antman wrote:

Hey Reyn S, did you have any issues with the clutch master cylinder? seems that one of the okes on the SXOC forum had to replace his master cylinder with a VR6 one as the inlet manifold clashed. Maybe it was because his motor is really far back.
Thanks again

Yes that can be why it clashed but what you can do is if you buy the same intake as mine cut out on the intake get it welded up and polish it again you won’t even notice that it was cut if you polish it up.
One thing you will have to change is the torsion bar in the front you can’t cut and weld it, it is spring steel I got one made up at Truck and Spring in Cape Town cost was R1500

Your intake is tops...where do you get locally and what is the price? I am getting the R33 front cut and I will use the r33 crosmember, do you think I could use the torsion bar from that?

Reyn S...did the clutch master clear with the stock rb inlet manifold...it looked like it did in your pics and did your bonnet close?