Jump to content
SAU Community

R30 diff

machg
 Share

Recommended Posts

machg Enthusiast

machg

Posted
Posted

Guys,

Doing a lot of K's in my HR30 now. It would be nice to have a taller diff. What is the tallest diff I can get for my car? It currently runs the L20ET auto diff with L24E manual box (120km/h = 4000rpm) so how much difference would the "tall" diff make assuming I could find one. Not worried about getting off the line as 1st gear is ridiculously short anyway!

cheers,

machg

Link to comment
https://www.sau.com.au/forums/topic/75098-r30-diff/
Share on other sites
B0oStEr Mentor

B0oStEr

Posted
Posted

What ratio is the auto diff? I think the tallest R180 ratio available is 3.54:1 but I don't know where you would find one.

If you ever have the L24 gearbox open drop in a set of overdrive gears from an L20 box. It gives you a very tall overdrive ratio and doesn't make the car sluggish in the lower gears like a taller diff does.

I had this gearset in my old L28 powered R30 and it drove very well.

I can't remember the exact revs at 100 kph but I think it was about 2600rpm with a 3.9:1 diff.

Link to comment
https://www.sau.com.au/forums/topic/75098-r30-diff/#findComment-1378009
Share on other sites
BensDR30 Experienced

BensDR30

Posted
Posted

I bought a new 3.54:1 R&P a few years ago & fitted it to my MR30, was a few hundred $. With the 4-speed auto it was a bit tall, but I expect it would be good in a manual or 3-speed auto. It's about to be fitted to a friends turbo MR30, as he runs out of revs with the 3.9:1 (yes, even in 5th...)

Link to comment
https://www.sau.com.au/forums/topic/75098-r30-diff/#findComment-1378584
Share on other sites

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

    • MBS206
      Question about BoV on RB25DET NEO

      By MBS206 · Posted

      Something to note, on an aftermarket BOV, it's quite possible to end up with the worst of both worlds, where on light throttle, there isn't enough force to open the BOV so you get small reversion and driveability issues, and with the venting to atmosphere, it dumps a lot of fuel on shifts. Realistically, dumping to atmosphere under power isn't a major driveability issues, compared to the issues of stalling from reversion. If you're getting up the throttle, then putting the clutch in, say on a shift up, but then don't release the clutch, yes, the engine can and will stall, but, just drive around it, and that's easy, let the clutch out in the next gear and the car rolling will keep it all running / going.who wants a hard hit of throttle and then to just let the motor idle anyway?   Main issue for driveability is blipping throttle and it wanting to stall, like when parking or trying to move in slow traffic.
    • soviet_merlin
      2020 Nissan Skyline 400R V37/Infiniti Q50 RS insurance in NSW

      By soviet_merlin · Posted

      As in they quoted one price, you mentioned the exhaust, and they promptly added $200 on top? Interesting.
    • GTSBoy
      Question about BoV on RB25DET NEO

      By GTSBoy · Posted

      Note that I'm not suggesting this is a great idea. Just saying that it is something that could be done to achieve a better outcome than the more shit ideas will provide.
    • luke gtr
      What's this Foreign Object?

      By luke gtr · Posted

      I'd try removing it, connecting hoses and see if that helps. Depending on specs, it could actually be restricting the flow(it also might be helping).
    • GTSBoy
      Question about BoV on RB25DET NEO

      By GTSBoy · Posted

      Yes, that's a hybrid BOV. The adjustable spring load ones are about making teh pressure build up higher before venting, so you get a more agressive whoosh. That is not what I meant or what you want. By "restricting", I don't mean "keep it closed until the pressure is higher, then open it fully". I mean "open it as soon as it is required, but only have a small port area, so that the flow rate out of it is slowed down". The pressure will rise to be higher than a bigger ported BOV would provide, but it would do while it is venting. The idea is to slow down the rate at which the replacement eair is flowing past the AFM, to reduce the magnitude of the air flow signal peak, to reduce the amount of fuel that is added per revolution.
×
×
  • Create New...