Jump to content
SAU Community

How Much Power Can A Standard Rb25Det Handle

filo_a31

By filo_a31,
in Engines & Forced Induction

 Share

Recommended Posts

filo_a31 Collaborator

filo_a31

Posted
Posted

This topic has probably been covered a million times but i cant find it.

Just wondering how much a power an rb25 with stock internals can handle all day every day on a safe tune?

My current project is: rb25det (standard motor)

550cc injectors

hks gt2530 turbo

14 psi boost

apexi power fc

z32 afm

hks pod filter

hks fmic

hks 3.5 inch turbo back exhaust

If there is already a write up can someone please let me know.

Cheers

Link to comment
Share on other sites
  • Replies 110
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

filo_a31 Collaborator

filo_a31

Posted
  • Author
Posted

awesome. Id be happy with 250-270 and i drive pretty hard, so i reckon i'll be sweet. As long as i get it tuned properly like you said

Link to comment
Share on other sites
PM-R33 Grand Master

PM-R33

Posted
Posted

awesome. Id be happy with 250-270 and i drive pretty hard, so i reckon i'll be sweet. As long as i get it tuned properly like you said

Your going to be very unhappy then.

As has been said 230kw is doable from one pushing it as hard as it can go. Friend had a HKS 2535 Kai on his and the most that ever saw was high 230s/low 240s.

Link to comment
Share on other sites
rondofj Veteran

rondofj

Posted
Posted

Why go aftermarket turbo when the stock one will reliably handle n make 30 less kilowatts?? Ie 200 rwkw. If u wana go aftermarket then mite as well go for at least 270 rwkw and up

Link to comment
Share on other sites
Lithium Grand Master

Lithium

Posted
Posted

Far out Mr Ash, hell I try and be specific about "@ hubs" but still occasionally let "@ wheels" slip, its easy to do given the difference in many cases is negligable and its basically more to quantify that it wasn't on an engine dyno. If you want to get pedantic you may as well make a forum rule that every time someone says a dyno result they say:

Ambient Temp:

Ambient Pressure:

Tyre Pressure:

Tyre Size:

Tyre Profile:

Tyre Temperature:

Tyre Type:

Gearbox type:

Dyno Type:

Dyno Correction method:

Air Intake Temperature location:

Ramp rate:

Tie down method:

But thats just taking silly and running with it :)

Link to comment
Share on other sites
R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Far out Mr Ash, hell I try and be specific about "@ hubs" but still occasionally let "@ wheels" slip, its easy to do given the difference in many cases is negligable

It's not occasional in this instance (otherwise i totally agree with ya). Back-to-back testing was done by another user that shows that particular hub dyno reads a solid 40-60kw different. That's a bit more than 2 degree change in ambient temperature :thumbsup:

I say all this because of the thread title "How much can a standard RB25 handle".

People get it in their heads that it's ok to run around making "350rwkw+" when people go around making false claims, when realistically thats really taking a gamble and not a good idea at all.

Over the next 12 months i think we might see a few more 300-320rwkw RB25's fail as there are a few users who have been around that mark now for 2-3 years. So perhaps even 300rwkw isn't that safe.

We have to remember that not everyone wants to go through the expense/drama of a dead motor/rebuild

Link to comment
Share on other sites
joeyjoejoejuniorshabadoo Grand Master

joeyjoejoejuniorshabadoo

Posted
Posted

Fwiw my motor lasted 3 years on 285rwkw pulp and 325rwkw e85 before it finally munched a bearing

That motor was a series 1, 1993 built, 250,000km engine and was a track car of some sort in Japan for god knows how long

Thing saw 7000 revs every time it ran, without fail and was dailied and tracked

Link to comment
Share on other sites
boostn0199 Grand Master

boostn0199

Posted
Posted

End of the day whenever you decide to mod the car and start pushing high 200,s plus on stock engine we all do it knowing all well that theres a chance that the engine might die sooner than expected but theres to many variables how you drive , how much you drive it, and of course the tune.

Of course a car tuned at 350kw which is a daily and never sees all that power being put down will last longer then someone at 280kw thats smashing track work constantly. But atm it seems like the median of what people go on stock is 300kw and also consider running on e85 for abit more security.

Link to comment
Share on other sites
STATUS Grand Master

STATUS

Posted
Posted

This topic has probably been covered a million times but i cant find it.

Just wondering how much a power an rb25 with stock internals can handle all day every day on a safe tune?

My current project is: rb25det (standard motor)

550cc injectors

hks gt2530 turbo

14 psi boost

apexi power fc

z32 afm

hks pod filter

hks fmic

hks 3.5 inch turbo back exhaust

If there is already a write up can someone please let me know.

Cheers

about twice as much as your turbo can deliver.

Link to comment
Share on other sites
STATUS Grand Master

STATUS

Posted
Posted

awesome. Id be happy with 250-270 and i drive pretty hard, so i reckon i'll be sweet. As long as i get it tuned properly like you said

0% chance.

Link to comment
Share on other sites
STATUS Grand Master

STATUS

Posted
Posted

It's not occasional in this instance (otherwise i totally agree with ya). Back-to-back testing was done by another user that shows that particular hub dyno reads a solid 40-60kw different. That's a bit more than 2 degree change in ambient temperature :thumbsup:

Ash this may interest you as i know your a racepace (killer workshop) fan boy.

We see quite a few cars from Racepace through nowadays and the results we see from our hub dyno are very close to the dyno dynamics dyno (generally 10 up or down) they are running... so hub versus roller is moot.

In fact only last week had a bayside blue R34 gtr with t518z's from there last week which pulled 280kw on mine and he had a dyno sheet for 290 from racepace exact same boost.

Link to comment
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

    • Lithium
      Boost level and torque curve

      By Lithium · Posted

      There is a LOT of stuff that can be done, it all depends on how much time and money you want to spend on doing in.  Not all ECUs will be able to do it, and the more control you need the more time and knowledge needs to be put into making it work.  If you're willing to spend the time and money and have the right hardware and skills involved there's a lot that can be done. 
    • thx78
      Boost level and torque curve

      By thx78 · Posted

      I am impressed with all this level of adjustment. I didn't expect all this possibility
    • Lithium
      Boost level and torque curve

      By Lithium · Posted

      Correct.  In the case of the 500kw dyno plot I showed you the car actually runs two boost control solenoids for boost control and a 5psi wastegate spring.  It allows me to control how much boost pressure is applied to both sides of the wastegate valve at any point and fairly accurately control boost target as a result. I've tuned it so that it's able to target anywhere from 5psi to 25psi depending on what's needed.  The target tables I've set up in that car are Gear vs RPM, so every gear has potential for a different boost (and torque) curve.   First and second gear have quite low boost targets, third gear actually has different target boost all the way through the rpm range as it's a stock RB25 gearbox - the boost targets have been chosen to maintain a peak of 600nm (what the owner has set as the maximum torque he's happy with putting through the stock 3rd gear) but it carries that to the rev limiter.   The boost curve to achieve that is something of a ramp up, then hold, then ramp up again and the power curve looks more like a flat line haha.  
    • thx78
      Boost level and torque curve

      By thx78 · Posted

      so you can decrease or increase the boost depending on the diet as you wish?     by acting on the wastegate?
    • Lithium
      Boost level and torque curve

      By Lithium · Posted

      That's torque and power, it's all from a single run.  The boost curve is "held back" from it's peak target in the 3500rpm to 5000rpm range from memory, so it ramps hard to something like 18psi then climbs more progressively to 23psi nearer 5000rpm.   It makes the torque (and power) ramp more "natural" and less hard on parts and traction, it doesn't feel artificially held back.   
×
×
  • Create New...