Jump to content
SAU Community

Rb20 Limits

RB ONEVIA

By RB ONEVIA,
in Engines & Forced Induction

 Share

Recommended Posts

RB ONEVIA Collaborator

RB ONEVIA

Posted
Posted

What are the limits of the internals? how much kw can they handle and whats the most psi you can squeeze into a standard engine? theres a R32 in hpi thats 302rwkw on standard internals. i searched and the best thread was from 5 years ago....

http://www.skylinesaustralia.com/forums/st...=RB20DET+Limits

Link to comment
https://www.sau.com.au/forums/topic/238632-rb20-limits/
Share on other sites
kat_00seven Apprentice

kat_00seven

Posted
Posted

hi, in regards to the countless people out there who think the RB25DET can't handle good hp on stock internals i have a Street Commodore magazine in front of me now with a VL calais in it with a RB25DET conversion, on stock internals with some very nice bolt on mods pushing 454.3RWHP / 339RWKW @ 18psi. :P:):)

If thats possible from some holden nuts with half an idea (i say that as the other half that didn't have an idea did it all in a holden HAHAHA) then surely a couple skyline enthusiest's can do the same.

Street Commodore #140 (june 2008) page 60.

Link to comment
https://www.sau.com.au/forums/topic/238632-rb20-limits/#findComment-4171408
Share on other sites
RB ONEVIA Collaborator

RB ONEVIA

Posted
  • Author
Posted

i just got a bigger turbo and im aiming for around 250rwkw on 18-22psi. i was going to get a metal head gasket but if i dont have to i wont. just dont want to be blowing it up just yet. aparrently RB20s are stronger than RB25s but smaller capasity so takes more to get more out of them.

Link to comment
https://www.sau.com.au/forums/topic/238632-rb20-limits/#findComment-4172250
Share on other sites
R31Nismoid Grand Master

R31Nismoid

Posted
Posted
hi, in regards to the countless people out there who think the RB25DET can't handle good hp on stock internals i have a Street Commodore magazine in front of me now with a VL calais in it with a RB25DET conversion, on stock internals with some very nice bolt on mods pushing 454.3RWHP / 339RWKW @ 18psi. :):D;)

If thats possible from some holden nuts with half an idea (i say that as the other half that didn't have an idea did it all in a holden HAHAHA) then surely a couple skyline enthusiest's can do the same.

Street Commodore #140 (june 2008) page 60.

Sorry but that doesnt really prove a thing. Shows the power can be made and thats it. You can make 500rwkw on a stock RB26, seen it myelf.

Doesnt mean the motor is in one piece these days (it didnt last long).

It comes back to the age old question what do people define as handle/be reliable etc etc?

1 year? 3 years? 5 years?

20,000? 40,000? 100,000?

Does it get driven with 340rwkw HARD every day? (on the street, very hard to believe thats remotely true)

Does it run 250rwkw daily with adjustable boost? (as an example)

What was the condition of the motor beforehand?

There are so many variables, questions and related that go well on from just those above.

I would say reliable would be deemed with the following - at LEAST 5 years, and at LEAST 60,000kms , and driven reasonably hard a couple of times a month with the odd track day, odd drag meet each year (2 max)

So in taking the above variables, NO - the RB25 cannot hold decent horsepower (340rwkw example) reliably in my book at all. Can it MAKE the power? Ye of course. Is it reliable? No.

Longest was what, 18-24months before it destroyed itself, and it wasnt driven daily (from memory).

So as you can see, one magazine article is hardly anything to get excited about when you actually sit down and really look into it rather than the glossy pictures.

On the other hand (with things we actually know) Roy on the forums has run 250-260rwkw for a number of years through his RB20 and it has a number of track days under its belt. The car is pretty well looked after, isnt driven daily, and runs like a dream on the circuit and has for roughly 3-4 years now.

So you could say safely the RB20 could hold 250-260rwkw for a number of years if tuned and looked after in the appropriate manner.

Has every RB20 run for that long? Possibly not.

So you've gotta take everything on its own merit.

Link to comment
https://www.sau.com.au/forums/topic/238632-rb20-limits/#findComment-4172695
Share on other sites
AD4M Proficient

AD4M

Posted
Posted

my first tubo setup on an internaly standerd motor,stock cams,stock inlet plenum & throttle body and just an std rb25 exhaust mani with the trust TD06 20G with a big 16c rear housing made 405rwhp on 26psi and ran a few low 12 second passes. i drove that setup every week for a year and it was always running 20psi or more

Link to comment
https://www.sau.com.au/forums/topic/238632-rb20-limits/#findComment-4173506
Share on other sites
RB ONEVIA Collaborator

RB ONEVIA

Posted
  • Author
Posted

its my daily so will be driven most days but not at maximum psi would like to go to the strip and crack 11s. just dont want to be getting blocks every couple of weeks. would it be wise to throw in a head gasket?

Link to comment
https://www.sau.com.au/forums/topic/238632-rb20-limits/#findComment-4173552
Share on other sites
RB ONEVIA Collaborator

RB ONEVIA

Posted
  • Author
Posted
my first tubo setup on an internaly standerd motor,stock cams,stock inlet plenum & throttle body and just an std rb25 exhaust mani with the trust TD06 20G with a big 16c rear housing made 405rwhp on 26psi and ran a few low 12 second passes. i drove that setup every week for a year and it was always running 20psi or more

i thought i recognised your car... its the one i was looking at in the latest HPI...

Link to comment
https://www.sau.com.au/forums/topic/238632-rb20-limits/#findComment-4174027
Share on other sites
AD4M Proficient

AD4M

Posted
Posted (edited)

i was told 6 at the most! but oh wells cant control these things

the motor let go the week the shoot was done (it was blowing bulk smoke out the breathers) and ive since sold all the turbo kit,cams,ecu and a few other bits. besides that its just sat in the garage waiting for its new motor but thats some time away yet

what you see in that feature is basicly my recomendation for the perfect 20, the car that the gt3040r turbo kit,ecu and injectors went into is making 300rwhp on a lazy 16psi and is just as responsive as the rb25 turbo that came off it!

Edited by AD4M
Link to comment
https://www.sau.com.au/forums/topic/238632-rb20-limits/#findComment-4174068
Share on other sites
Italiazr1 Proficient

Italiazr1

Posted
Posted

in regards to the top question my car before i had it rebuit was set to 20psi running everyday pump fuel it let go a month later because the head gasket blew.

a few other things contributed too but anyway dont run over 20psi unless you got race fuel

pump fuel sucks dude you will blow your 20 pretty quick if youve just bolted up everything to a stocker

im making 241rwkw now after my expensive rebuild the engine pumped out a 260kw run but we detuned just in case somethin let go

i reckon my car is capable of 280 - 300 kw if i stick some boost in it and tuned it to race fuel for a couple of passes

my other question to adam was that ive got a gt30 in mine now but its bloody laggy 5000rpm starts to com on hard

did cams make a big difference in your car?

im gonna change my turbo to the 3071r same power less lag? what you reckon?

Link to comment
https://www.sau.com.au/forums/topic/238632-rb20-limits/#findComment-4174523
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

    • TurboTapin
      boost source Size Garrett gt28 gen2

      By TurboTapin · Posted

      You just need to remove the compressor housing, not the entire turbo. I would not be drilling and tapping anything with the housing still on anyways. 
    • Kinkstaah
      Mistakes were made, my R34 Story

      By Kinkstaah · Posted

      So, I put my boat on a boat. First of all, I'm going to come out and say it. Why is Tasmania not considered a holy goal, an apex that all road-legal modified cars go to, to experience? This place is an absolute wonderland of titanic proportions. If people are already getting club runs for once in a lifetime 30 person cruises to Tassy then I've never seemed to see it. It is like someone replaced the entire place with an idyllic wonderland for cars, and all of the people living there with paid actors who are kind, humble, and friendly. Dear god. After doing a lap of almost all of the place I've found that it's a great way to find out all of the little things that the car isn't doing quite right and a great way to figure it all out. All in all, I drove for 4 hours a day for a week and nothing broke. I didn't even need to open the engine bay. This is by all means a great success, but it has left me with a list of things to potentially address. I also now have a 3D printed wheel fitment tool which annoyingly hasn't got any threads in it to actually assemble it. I might be able to tape it together to check the sizing I actually want to use, but it'll likely involving pulling the shocks out to properly measure travel at least at the front, and probably raise the car while I'm at it, at least in the rear. I scraped on quite a few things and I'm not sure how else to go about it. I was taking anything with a bump at what felt like 89 degree angles. And address those 10 other tasks. And wash the car. God damn it is dirty. And somehow, the weather was perfect the entire time - And because I was on the top of Mt Wellington it turns out it was very much about to freeze up there. I did something I typically never do and took some photos up there in what must have been -10 and the foggy felt like suspended ice, rather than mere fog. If you own a car in Australia, you owe it to yourself to do it.
    • QB6SAGR
      Battle of the broken skylines

      By QB6SAGR · Posted

      Damn that was hilarious, and a bit embarrassing for skylines in general 😂 vintage car life ey. That R33 really stomped. Pretty entertaining stuff
    • cosline
      R32 gtr transmission strength, billet plate

      By cosline · Posted

      Hi, I have a r32 gtr transmission. Does any of you guys have an idea how much power it will hold with the billet center plate and stock gearset? At what power level and use did yours brake with or without billet plate? Thanks, Oystein Lovik
    • Rezz
      Spotted on the street....

      By Rezz · Posted

      Saw this replica police car based on a Mitsubishi Starion XX parked next to a 'police box' (it's literally a box) in Hirohata, Himeji City in Hyogo prefecture the other day. It's owned by Morii-san who is a local Mitsubishi Starion enthusiast. According to a local radio station blog post, he always wanted to make a police car himself based on ones he saw in his favourite Manga comics.  As it's illegal to modify a car to look like a police car and drive on the road, Morii-san tried many times to get permission from Aboshi police station headquarters nearby. They refused initially by after they got tired of that they granted him permission. However, the car can only be displayed on private property and obviously can't be registered as long as the police livery is present. The car was completed at a cost of 1.5 million yen (US$ 10,000) in addition to the car cost. A location was chosen outside Hirohata Police box where the car can easily been seen from the street. Morii-san has two other Starion road cars, both widebody GSR-VRs.
×
×
  • Create New...