INFO on R31 with RB20DET

[urbanoperations]

hi all

i am looking at getting an RB20DET for my skyline R31...

At The Moment i just have a Couple of Quick Question..

does the RB20DET loom bolt Str8 up into the existing rb30 loom spot and computer??

Do you need to run an after market ignition System, like microtech or something like that?

Does the Rb20DET bolt straight up to the standard rb30 engine mounts?

Is it worth having an LSD or is standard Single Spinner Diff Good?

Do the Standard Brakes Stop it? or is it worth upgrading them??

but something has got me stumped here, How do you start the things when they run coils and transistor unit? can i adapt the rb30 ignition loom into it or something like that?

Does the Fuel Pump Need upgrading??

Thanks for you help all...

[blind_elk]

You are probably best off getting a front-cut, where you will get the engine and a loom & ECU. Otherwise, you will require an aftermmarket system. There is no way the R31 ECU will run a RB20 - as you pointed out, the RB20 runs multiple coils (triggered by a CAS), while the RB30 runs a distributor.

The RB20 will slot straight in on the R31 mounts.

[urbanoperations]

yea i know that but i can get an RB20DET Eccs out of an R32 with a LOOM and computer, and im wondering if i wire that all up and put the computer in the spot where the rb30e computer goes, how is it going to fire off the coils and stuff, because i dont really want to get an Aftermarket Computer and wiring loom for it because i wanna keep it a simple project...

[blind_elk]

If you get a RB20DET loom and ECU, they will have everything required to run the engine, including working the ignition system. All you need to do is pull out the RB30 ECU and loom, and replace it with the RB20 ECU and loom. I'm guessing the RB20 ECU will mount in the same spot as the RB30's (that's where the RB20 mounts - behind the passenger kick panel).

[urbanoperations]

yea it does but, how can i run the aussie dash with the rb20det ? like temp gauge and oil pressure gauges in the aussie dash? also would i use a R32 Starter motor loom and adapt it to the battery so i can start the rb20det??

[predator]

Starter motor loom??

You basically are using the RB20DET engine loom (start motor would be off that i assume), the RB20DET ECU, and from that you splice into the dash loom to get your little gizmos working. But most of that stuff is separate to all the engine sensors and that sort of thing.

All your coil firing and ignition stuff will be controlled from the RB20DET ECU, so don't stress about that side of things.

Some adaptions need to be made also, i believe for the fuel pump system, and other bits and pieces such as the guages, speedo, tacho, etc.

Anyhow, I will admit I am just going from what I have read, not done. Bozz knows all.. In fact just bolt it in and pay him $500 or whatever he charges to wire it up for you

Apparently not massive difference between stopping power of R31 and R32 brakes, so not required to be changed for engineering in many states.

LSD would be nice.. you're going to have troubles with the single spinner and feeding power through it to the ground on takeoff. A diff specialist told me the borg warner *should* be strong enough in terms of holding out (e.g. not go cactus), but LSD would be better. The single spinner should handle the power and stay alive for a while, if you don't do massive burnouts, take it a bit easier right off the line, and crap like that.

and before you ask.. no you can't fit an LSD from any import model skyline in. You'll have to get an aussie B/W LSD that fits the housing.. can be hard to find these days. Expect to pay around $1k to go to an LSD.

[SKY031]

Apparently not massive difference between stopping power of R31 and R32 brakes, so not required to be changed for engineering in many states.  

All turbo R31's had bigger brakes factory standard, and in Victoria a brake upgrade is required for an engineers certificate.

[predator]

..not in QLD apparently, which makes me happy

but i did say "in many states" to cover my ass

you will need bigger brakes then if you're in VIC

[Mcboost]

[Mcboost]

hey mate, i just finished doing the saame conversion about 4 weeks ago, these guys pretty much covered it, you will need to pull the temp sender out of the rb30 and putit into the rb20det, and same with the speed sensor that screws into the side of the gearbox. as for the tacho, you need to run a seperate 12v inpput onto the line with a 10kohm .5 watt resistor between the 12v and tacho signal wire. beasides that i used the alternator air con pumps off the rb30, they bolt straight on, its all pretty much bolt straight on stuff, also your turbo dump wont exactly fit you zorst so u may need a custom peice made up, i used a rb25 zorst between turbo and cat and it fit really well. besaides that its pretty easy. good luck, any other quest, let me know.

[urbanoperations]

ahh ok, i currently have got turbo Import brakes on my R31 atm which would probably be good for the turbo conversion, although i dont think i would run powersteering because the racks always leak oil out (trw), but yea i can easily get that zorst system made up... i think id buy another clean skyline and work an rb20det into that one...

thanks for you help all....

[Mcboost]

ahh ok, i currently have got turbo Import brakes on my R31 atm which would probably be good for the turbo conversion, although i dont think i would run powersteering because the racks always leak oil out (trw), but yea i can easily get that zorst system made up... i think id buy another clean skyline and work an rb20det into that one...

thanks for you help all....

i sent u a pm, make saure to check it