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

    • Danowner
      Hypergear ATR45 SAT Turbo With addons (brand new - never used)

      By Danowner · Posted

      Yeah pretty impressive hey, good to see quality products not over-shooting their prices. That's what drew me to buy the hypergear turbo, just a shame I've never got the chance to see it in action
    • Julsmadrid
      RB25det

      By Julsmadrid · Posted

      Thank you GTSBoy and MBS206 I have done the compression test with the motor out of the vehicle, reason for the test was to see if I needed to remove the head and do rings etc while its out. I'm in the process of respraying the vehicle and tidying up a few things. Story behind it all is I've just purchased the skyline and it was running when I got it, never drove it on the street though as I wanted to pull it down and do it all up again before registering it. the gentleman I purchased it from told me the motor has a forged bottom end and has a decent tune through it but I was going to pull the sump off anyway to see if it is a forged bottom end. that's why I thought id do a compression test beforehand. 
    • soviet_merlin
      Hypergear ATR45 SAT Turbo With addons (brand new - never used)

      By soviet_merlin · Posted

      Man, I'm kind of amazed that the price of the turbo has not changed in 7 years. Everything else is inflating beyond reason, but not this? Good on Tao / hypergear I guess? Anyways, good luck with the sale!
    • Danowner
      Hypergear ATR45 SAT Turbo With addons (brand new - never used)

      By Danowner · Posted

      I'm selling my brand new, in the box, never used Hypergear ATR45 - and I had some additions I paid for a few yrs back when I purchased it. Never ended up having the rest of the money to add all the mods at once, so I just ended up slowly selling each part. I originally had it internally gated, with the dump pipe, however I found it was incompatible with what I was going to use it for, so I contacted (I think Ken) from Hypergear, and he and I messaged back and forth & he got me to ship the turbo back, where they modified it & made it externally gated, and gave me the 5 bolt dump pipe attachment for custom welding. (Photos below) This turbo like I said has never touched the inside of an engine bay, it's completely brand new, never used, been sitting in the same box it arrived in, covered in plastic & all. Below are the photos of it: And while the guys at Hypergear were making it in-shop, they sent me some photos of the process: I'm looking at selling this just because I'm in need of the money right now, and don't have plans on modifying the 34 anytime soon - and from reviews & peformance sheets, this turbo had amazing results back when I was researching. The turbo was purchased in 2018 for $1.9k, with the mods I got added on. Looking at the website now, for the same turbo they sell (ATR45SAT), with the current addons it adds up to $1830 for the turbo Current addons included: - Bolted dump adaptor - Ball bearing CHRA - Braided oil feeding line So I'm looking to possibly sell it for around $1800, with shipping included in that 1.8k, It cost me around $120 to ship - so yeah thought I'd throw it out there and see if anyone was interested in purchasing. Cheers!
    • Komdotkom
      R32 Gtst - Track Car

      By Komdotkom · Posted

      Great pic  
×
×
  • Create New...