Jump to content
SAU Community

Rb20 Vs Rb25 Power/weight Now With Maths!

Matvei27

By Matvei27,
in Engines & Forced Induction

 Share

Recommended Posts

Matvei27 Community Regular

Matvei27

Posted
Posted (edited)

Out of curiosity I decided to calculate the actual performance difference between a R32 GTS-t and R34 GT-T.

One with the RB20DET, and one with a RB25DET NEO.

I decided to share my work if anyone was interested in knowing the actual power/weight ratio of these cars.

I am calculating using the coupe (Type M for the R32) variants, with manual transmission.

For the R32, we are calculating using the zenki which is slightly lighter but not by much

Standard figures are 1280kg @ 215PS for the HCR32,

and 1410kg @ 280ps for the ER34.

Here's the results:

Stock:
R32 GTS-t = 5.95kg/ps
R34 GT-T = 5.03kg/ps

Stage 2 mods:
R32 GTS-t @ 220rwkw = 3.62kg/ps
R34 GT-T @ 250rwkw = 3.55kg/ps

More mods:

R32 GTS-t @ 240rwkw = 3.36kg/ps
R34 GT-T @ 270rwkw = 3.29kg/ps

Tons of mods:

R32 @ 260kw = 3.10

R34 @ 300kw = 2.97

As you can see from the results, the difference is quite significant in stock form, which makes sense because the RB25 has that extra displacement in addition to a bigger turbo. However, once both cars are modified, the difference is quite insignificant until you get past the limits of the RB20.

Edited by Matvei27
Matvei27 Community Regular

Matvei27

Posted
  • Author
Posted

LOL.

seriously?

Dude no.

No.

If it makes you feel better here's how it looks with heavy mods:

R32 @ 260kw = 3.10

R34 @ 300kw = 2.97

The R34 outperforms the R32 in stock and heavily modified forms, but in between they are quite similar at least according to the numbers.

Matvei27 Community Regular

Matvei27

Posted
  • Author
Posted

I'm not making shit up. I'm comparing the data on the two cars. That doesn't mean *real world* performance will be the same, but that's subjective. The only way to objectively compare the two cars is with math, unless you have some better idea.

Ben C34 Grand Master

Ben C34

Posted
Posted

Cmon. You telling me that 270 rwkw is the max safe power of a neo. You're cooked. What are you basing that on?

If what you are saying is true, why aren't rb20 r32s more popular?

Matvei27 Community Regular

Matvei27

Posted
  • Author
Posted (edited)

Cmon. You telling me that 270 rwkw is the max safe power of a neo. You're cooked. What are you basing that on?

If what you are saying is true, why aren't rb20 r32s more popular?

I mean for daily driving. People regularly get 300+kw out of them, but remember the RB25 is slightly less reliable. I included the figures for 260/300 as well for those with more mods.

And as I said above you *will* begin to see a difference at 260/300kw between the two cars. The difference is in stock form and in heavily modified form. Just not in between the two endpoints, apparently.

They're not popular because you have to spend more money to get the same gains that you could get easily from a RB25.

Clearly if you intend to go beyond 260/300kw on either engine you are going to be better off with the RB25.

But if you don't, I'm not sure there's going to be too much of a difference.

Edited by Matvei27

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

    • Kapr
      What brakes on R34 GTT(Europe)

      By Kapr · Posted

      Hi...a bit a "development" on the brakes. I spoke to the guys where i get brakes from...and they are saying that 296mm EBC are for R34 GT-T. I then went to their site: https://www.ebcbrakes.com/vehicle/uk-row/NISSAN/Skyline (R34)/ and search for my car(R34 GT 1998 - it has GTT brakes) and it show me this USR1229 number and they are rly 296mm rotors... So now iam rly confused... The rotors i have now on the car are 310mm asi shown... So where is the problem? Does the whole EBC got it wrong or my calipers are just...idk know what?  
    • niZmO_Man
      Lock up the old for sale / wtb threads.

      By niZmO_Man · Posted

      Oh What the hell, I used to get a "are you sure you want to reply, this thread is XX months old" message. Maybe a software update remove that. My bad.
    • Kinkstaah
      R34 Gtt Wheel Offset Advice

      By Kinkstaah · Posted

      This is a recipe for disaster* Note: Disaster is relative. The thing that often gets lost in threads like this is what is considered acceptable poke and compromise between what one person considers 'good' looks and what someone else does. The quoted specs would sit absurdly outside the guards with the spacers mentioned and need  REALLY thin tyres and a LOT of camber AND rolling the guards to fit. Some people love this. Some people consider this a ruined car. One thing is for certain though, rolling the guards is pretty much mandatory for any 'good' fitment (of either variety). It is often the difference between any fitment remotely close to the guards. "Not to mention the rears were like a mm from hitting the coilovers." I have a question though - This spec is VERY close to what I was planning to buy relative to the inboard suspension - I have an offset measuring tool on the way to confirm it. When you say "like a mm" do you mean literally 1mm? Or 2mm? Cause that's enough clearance for me in the rear :p I actually found the more limiting factor ISNT the coilover but the actual suspension arms. Did you take a look at how close those were?
    • Kapr
      What brakes on R34 GTT(Europe)

      By Kapr · Posted

      @GTSBoy yeah sorry i know thery are known for colors bud those DBA are too in colors 🙂 Green will be good enough for me  
    • Duncan
      Unpeeling the Orange

      By Duncan · Posted

      That's my life. Past-Duncan has a lot to answer for
×
×
  • Create New...