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Kcr R31 Original Engine 3.0e

bkc

By bkc,
in Engines & Forced Induction

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bkc Community Regular

bkc

Posted
Posted

Hi all

anyone can you help me ?

I have Nissan skyline gtsx 89 (kcr) r31 coupe .

I fit it engine RB25DET AND GEARBOX (TRANSMISSION)R33 ECR33 GTS TYPE M !

I NEED know what type rear gearbox ( differential ) suitable for the engine and transmission direct fit on the kcr R31?

because original (OEM) differential not enough to the rb25det with

transmission !! ( high RPM LOW SPEED AND NOT GOOD RESPONSE ON THE LOW RPM !!!

FOR the powerful and top speed and good response ?

NOTE: modify dump pipe ,,exhaust system complete ,, air intake filter,, big intercooler only !! ,, stock turbo stock engine . etc :):(

Thanks all .

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bkc Community Regular

bkc

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  • Author
Posted

Hi .

PLZ : I need from your help to me and I like for advise to me !

my ask to you is : I have skyline gtsx 89( coupe ) cases kcr / R 31 ORIGINAL ENGINE RB 30e carburetor !! I change engine and FIT it RB25DET AND GEARBOX( TRANSMISSION) FROM GTS ECR /R33 !!

( WHAT IS the type the suitable differential fit it ) ?? for that engine & gear box ? for the racing street and bitter bower ,, top speed and response ( only modify : dump pipe and complete exhaust system 3 inch ,,air filter intake and change big intercooler kit( i mean changed OEM small intercooler use it !! stock engine and turbo etc . ( PLZ : I need know suitable differential for the engine and gearbox direct fit it ON THE gtsx 89 R31!! ( low RPM ,,TOP SPEED and high speed !!

(( because original differential not good and not enough ? (differential number 10,000 ,39 Rack!

example : 3000 rpm and speed meeter 140 KM !!

Thank you for your time .

Best regards .

Simon-S14 Grand Master

Simon-S14

Posted
Posted

Keep in mind i have no idea what the f**k you are saying so i will try my best.

you will need an R200 Long Nose Diff, the R31 coupe comes with them stock im pretty sure. this diff has the same sized crownwheel (internals) as the R32/33/34 diff's so yes it will be strong enough.

as for ratio, get a 4.1, this is what the R33 has stock and since you are fitting the 33 motor and box, you'll essentially have the same drivetrain as a 33.

bkc Community Regular

bkc

Posted
  • Author
Posted

MY skyline gtsx kcr R31 RB30e middle east state of Kuwait , I need strong

street racing ,response gear one -2-3-4 and not stop on the gear 5 !! to the

top speed ( I mean on the gear 5 does not begin to drop !!

Thank you again .

floody Experienced

floody

Posted
Posted (edited)

Sounds like you have a 3.9:1 ratio long nose R200 differential. I would retain this differential and fit a suitable limited slip centre. It should compliment the RB25DET and gearbox quite well.

The original differential casing in the R31 is a load bearing item; the R33 casings are not. I would advise it is not a good idea to try and use the R33 differential housing.

Edited by floody
bkc Community Regular

bkc

Posted
  • Author
Posted

Thank you for your reply ..

(( I hope that you find a solution to this problem!! diff ...

Well , what difference between RB25DET,250HP r33 and RB25DET Neo ER34 280hp?? why? ( injectors , camshaft,Turbo .etc

PLZ : I HOPE let me know for that !

Thank you very much again .

bkc Community Regular

bkc

Posted
  • Author
Posted (edited)

Differential: - All are R200

84-86 Z31 Turbo: 3.54:1 - Open

09/86-04/87 Z31 Turbo: 3.7:1 - Open

04/87-89 Z31 Turbo: 3.7:1 - Clutch LSD

PLZ : any type suitable of diff I can choice from top write ?? :devil:

Thank you ....

Edited by bkc

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