Jump to content
SAU Community

R33 Rb30 Conversion

JNR24

By JNR24,
in Engines & Forced Induction

 Share

Recommended Posts

  • Replies 7.2k
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

Duncan
Duncan

Just thought I would bump this 20 year old thread because the Skid Factory have just posted up a video summarising a lot of the content, format might be more familiar for newer members

JNR24
JNR24

fyi guys, Well yesturday i picked up a RB30 for my conversion into my R33. I will be using my RB25DET head on the RB30 block. So i started stripping the motor down, pulled the crank, pistons, girdle

Cubes
Cubes

Here is all I have at the moment: http://www.geocities.com/r32_jjc/ Unless you are on broad band make sure you right click then save as. The file is around 120kb. If there is anything I have got w

Posted Images

Cubes Grand Master

Cubes

Posted
Posted

I went for a spin in a friends VLT and vice versa today.

I actually quite liked the power delivery, gearing and turbo matching of a VLT running a 2.5" exhaust, FMIC & 13psi.

Turbo spool differences.. High gear 1500rpm full throttle mine will make 12psi pretty quick. The VLT didn't. It required around 2000rpm on board to get boost being made. On the road I noticed the VLT started pulling hard from around 3500rpm and actually went pretty well.

Taking the VLT man for a spin first thing he said was. "It doesn't have time to 'Use' the torque" I feel he hit the nail on the head.

The stock turbo made peak torque at 2000rpm. Giving the car a little stick its always up over 3500rpm, simply because of road speed.

Power drops off after 4950rpm and really there is no point reving past as the short gears have you selecting the gear at peak power then accelerating with power dropping rather than gaining like it should.

In other words, a stock rb20, 25 or even RB30et turbo is really a bad match for the RB30DET with the Skylines gearing.

Open up the hot side as to improve top end (over 5000rpm) VE and have the 3ltr reving to 6000-7000rpm and the gearing will be a good thing. Possibly a new gen VG30DET turbo?

As I am a full time student I make the money to 'waste' on the car during holidays. I may pick up a cheapy Vg30DET turbo, throw it on and see how it goes until I get the big mofo turbo on.

It was nice to be in a car that you can actually wind out the gears a little. Something I haven't felt for a long time.

The RB30DET with the stock turbo's on it really does feel like Diesel Powahhhh. lol

Very much like my parents 2003 Nissan Patrol 3.0TDI.

They have since traded it in for a Landcruiser V8 auto, which suprisingly goes damn hard. Very punchy off the line.

StockyMcStock Proficient

StockyMcStock

Posted
Posted

i still can't beleive you even bothered to get the 30DET tuned at all with an RB20 turbo, but i guess you just wanted it running ASAP which is understandable. as a comparison, a friend of mine had an RB30DET and he was using a TO4E with a big front wheel (can't remember exact specs) but get this: the rear used a 1.33 a/r. the turbo was off a big HP rotor, but the 30DET spooled it to 20psi by 4000rpm. boy did that thing have some stink in it.

in short, you can run quite a large turbo off these buggers and still get decent spool time. of course, being 3 litres, high compression and twin cam, you probably won't even notice that it's off-boost most of the time.....

in a few weeks i'll throw up some pics of my engine in this thread, you guys might be interested to see just how far i am going to reduce lag :P

RB30-POWER Mentor

RB30-POWER

Posted
Posted

3.7:1 are great with these motors.

Stacks of torque, any diff gearing lower then that (higher numerically) is really a waste, unless you can spin it to 8k.

3.7:1 allow 100km/h at around 6k or so in second gear on my brothers R31 with the 25/30DET.

Although i think the 3.45:1 in my 30ET VL are preety good as well, the 3.7:1 give a slight advantage down low, without sacrificing the top speed available from each gear.

Gearbox ratio's may be a little different in the R32/R33 so you would have to take that into consideration as well.

TTT Grand Master

TTT

Posted
Posted

CUBES - Have you considered getting a second hand cheap turbo from a Rotary of some sort?

I'm pretty sure they have rather large exhaust wheels even on the stock cars.

I'm sure it won't be a direct bolt on but they are fairly cheap and might work out a better option than the VG30 way..

just a thought.. not sure if it's a good one though... hehehe

Cubes Grand Master

Cubes

Posted
Posted

The VG30DET turbo is capable of 200rwkw.

Are the rotary turbo compressors capable of flowing this much air?

I had a mate with a 13B T in a little RX3 many years ago. 200rwkw was made with a highflowed turbo.

The exhaust side may be capable but is the compressor side?

discopotato03 Grand Master

discopotato03

Posted
Posted

Joel I think you'll find the VLT had the wide ratio ( ute pack !) gearbox option meaning shorter gearing 1-2-3 . Actually , got a copy of the Holden 3.0ET (Vol 6) manual that states MX7 ratios are 3.580 , 2.077 , 1.360 , 1.000 , 0.760 .

When used with the 38/11 (3.454) final drive the overall ratios are 12.367 , 7.175 , 4.698 , 3.454 , 2.625 . From memory the R32 GTST Manual uses a 4.36 final drive and the gearbox a 3.321 1st gear ratio making for 14.479 overall , 2nd 8.288 , 3rd 5.703 , 4th 4.36 , 5th 3.309 .

My master plan was to have the VLT's 1st gear ratio (overall) but with the closer ratio gearbox . So divide 12.367 by 3.321 which gives 3.724 as my ideal final drive ratio . I've yet to dabble in the later type short nose R200 differentials and have not heard of any with taller ratios than 4.0xx . The later Nissans were using larger diameter rims ie 16+ whereas the earlier types ie R30/31 , S12 , 280Z , Z31 were on 14's and 15's . I'm sure a look at tyre rolling diametres and available differentials should get me in the ball park for an R32 . I'll probably need to look into up a ratio (4.1 ?) and up a tyre profile to 60 series . The only GTST I see on a regular basis wears either 225/55's or 205/55's on the std 6.5x16 rims , can you tell me what is standard .

Cheers A .

Fitzpatrick Speed Works Mentor

Fitzpatrick Speed Works

Posted
Posted

GTR standard diff ratio is 4.11

GTS4 came with a 4.3.

I think you will find the rolling diameters on all these cars to very similar as the older cars have a taler sidewall on the tyre to compensate for a smaller rim. Tyres only come in a few select overall rolling diameter usually 570mm, 600mm, and 620mm... these are the common passenger car rolling diameter for example a 215/65/14 is the same rolling diameter as a 265/35/18. SO i dont think tyre size plays any key roll in the discussion of final drive ratios especially if people are just using a common tyre.

On another note a friend just finished a VL turbo I had some things to do with. The build was forged internal with a standard 25det head, custom plenum with 90mm throttle body, gt35/40 turbo with a .92 rear a/r all powered by a mcrotech. The car spools to 15psi ie run it by 3600RPM and made 476rwhp on only 14.5psi. With a 3.45 diff ratio and standard VL gear box the car is an animal all the way up to and including 3rd gear. I was very impressed with the power output considering the low boost and also the fact the head is untouched. I will try to find a dyno print out in the next week.

retrotec Enthusiast

retrotec

Posted
Posted
3.7:1 are great with these motors.

3.7:1 allow 100km/h at around 6k or so in second gear on my brothers R31 with the 25/30DET.

Although i think the 3.45:1 in my 30ET VL are preety good as well

What kind of revs in 5th are we looking at on highways, 110, 120,130, and 140 ks etc.. ? (rb25det box, r32 16" rims n tyres)

StockyMcStock Proficient

StockyMcStock

Posted
Posted
On another note a friend just finished a VL turbo I had some things to do with. The build was forged internal with a standard 25det head, custom plenum with 90mm throttle body, gt35/40 turbo with a .92 rear a/r all powered by a mcrotech. The car spools to 15psi ie run it by 3600RPM and made 476rwhp on only 14.5psi.

exactly the same boost level as what i'm going to be running, but i'll be using a larger turbo. amazing power out of the 35/40 at just 15psi, i didn't know they could push such numbers at so little boost!

retrotec Enthusiast

retrotec

Posted
Posted
The point I'm trying to make is I probably can't get a 3.7 to 1 ratio short nose differential to suit an R32 GTST so a 4.1 with a larger diametre tyre may go close .  

About that  .92ARR housing , is that a propper GT35 housing ?

Cheers A .

What about a 3.7 crown wheel for the 32 diff?

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • The Bogan
      Tyres you use(d) and how u would rate them

      By The Bogan · Posted

      Done about 5k Km on the PS5's now, excellent street tyres, great in the dry, and the wet, seem to be wearing very well, I haven't measured tread depth, but it looks like minimal wear, I also had a different alignment done about 1500km ago,  From looking at the tread wear, which is really only minimal, the alignment changes were based off how the tread looked, and how it felt throwing it around, the changes have shown great results 215/45 17 at 32 psi Front Caster: 5.5° Camber: -1.5° Toe: 0.0mm Rear Camber: -1.0° Total Toe-in: 1.5mm I actually prefer PS5's now over the RS4's, as the PS5's are much better in the wet IMO, and as the MX5 gets driven in all weather conditions doing daily duties, hwy trips, and blasts in the mountains, wet weather grip is high on my priority list
    • Russell2208
      Attesa ETS Pro Install on R33 GTR

      By Russell2208 · Posted

      To update this thread. I got sent a replacement Attesa pro unit and all is now working as expected. Cheers
    • Ozdavroz
      The FD RX7 is the best looking 90's JDM car

      By Ozdavroz · Posted

      FD is so sexy she can pull off tri-spokes
    • Butters
      Front LSD Quaife , how streetable ?- QDF3L Owners

      By Butters · Posted

      Indeed they do. Best my diff builder could tell is it's a combination of the different cut/angle and it would seem they lap them in well on accell but less so on decel. He had to use a slightly different pattern to the lap to get the best result noise wise. Also as the rear diff runs in, the whine is getting less.        Overall they seem like a good thing so far. He's done a few neat crown/pinion before but all for race cars with loud everything, in most cases the exhaust is louder, so I am the first to notice.... and be somewhat of a pain   
    • GTSBoy
      R34 4 door indicator and horn issue

      By GTSBoy · Posted

      What do you mean by "test"? It sounds like you're just switching things on and off that you already know don't work. Get the wiring diagram and a multimeter and start looking for power where there is supposed to be power and earth where there is supposed to be earth. Look for continuity across switches that are otherwise unresponsive, etc etc.
×
×
  • Create New...