0.9 Bar On Stock Internals?

[JD-33]

Hi All,

My next door neighbour told me that I could run 0.9 bar on my 97 gtst with its stock internals!

What do yous all reckon of this (i.e. wht bar/psi would you not go above with stock internals on a RB25) ..

Cheers,

-JD

[Mr. Oizo]

On what turbo?

[JD-33]

stock 97 gtst s2 one... whatever it is exactly.. got no idea..

[gtrGhosTDoGG11]

Worry more about the tune, if the tune is good then that boost is fine. Your running your turbo at the limit though, not worth the extra small amount of kw. Just run around .85 bar on your ur stock turbo, less heat, more safe etc.

[paulr33]

0.90bar is beyond the standard turbocharger limits so its just more heat. you wont gain anymore power but if you insist on doing it for the sake of "im running more boost" knock yourself out. the intake temp will rise though

[Kryostaisis]

as long as you have an intercooler and a good tune, you will be able to run 1.0 bar fine, but your turbo wont last, the stock one wont handle anything above 13psi

your stok internals are good for approx 270rwkw with a good tune, some people have even seen past 300rwkw(probably due to a higher reading dyno)

[paulr33]

this is not true at all. the stock compressor is past its effiency past 12psi. for every psi you dial in you add in more heat and increase the shaft speed. the more heat you dial in, the less power you make and the quicker the shaft speed spins. also with an unsafe tune the exaust outlet temps will soar will killing the exhaust wheel.

more boost = more power

ONLY when you are in the effiency zone of the compressor wheel

ie: its true when you are running 7psi on the stock turbocharger and up it to say 9psi. as when you dial in more pressure, more airflow follows. airflow makes power, not boost.

[N I B]

Ive found 10psi to be peak power from these turbos on the Dyno.

[JD-33]

ahh cheers guys, thanks for you opinions..

at the moment i am running 0.75 bar boost..

so i might knock it back to 0.6 to be safe (until i get a FMIC and better turbo)

Cheers,

-JD

[Links]

0.66/0.68 bar is the stock for >4,500 rpm on R33 - so run it up there otherwise your losing out.. as for 0.75 - well.. mine spikes to that on occasions.. see how you go - get your FMIC run maybe 0.7/0.75..

been discussed alot before - people recommend 10psi daily max and 12psi max full stop out of stock turbo as the exhaust wheel tends to desintegrate..

[jazza08]

FMIC, Zorst, Power FC + 1 bar = 300rwhp

[paulr33]

1 bar on stock turbo = same as 12psi

so that extra 2psi is just more heat

likely to make it go bang

[paulr33]

and 220kw is too high, post up the graph

[Kryostaisis]

hes right, you can get 300rwhp out of a stock turbo, providing you have a good tune and a ECU, liek in his case, a power fc

ive seen many skylines make over the 210rwkw mark with just power fc and airfilter, fmic and exhaust.

but you have to be careful, some dynos use different correction methods which give higher readings than those of other dynos

[thizzle]

  Kryostaisis said:

your stok internals are good for approx 270rwkw with a good tune, some people have even seen past 300rwkw(probably due to a higher reading dyno)

so many people make way over 300 not due to a "higher reading dyno" due to a nice turbo and nice tune

Edited April 16, 2006 by thizzle

[jazza08]

The 2psi will give more hp, just not too much more, as you said it will increase heat a fair bit and shorten the life of the turbo!

Generally I would say 400hp (rb25) is the limit on standard internals if you treat it right and have a very good tune

I think what he means above is that some dyno'd read higher than others, so a person may say i make 300rwkw on standard internals where as on a diff dyno they'd be making 270ish rather than having a diff turbo n set up?

Edited April 16, 2006 by jazza08

[Kryostaisis]

  thizzle said:

so many people make way over 300 not due to a "higher reading dyno" due to a nice turbo and nice tune

ive seen a few have that aswell, mines got 297rwkw on stock internals, but ive also seen a few around the 300rwkw mark on a low reading dyno have their pistons crack, under a conservative tune aswell

in the end its completely up to the owner of the car, if you are willing to risk your engine blowing then by all means, boost it up and tune it up well. otherwise rebuild your bottom end then work from there

most dynos use the shootout mode for power runs, its a common fact, on shootout mode, the dyno will give a higher reading than if they used another mode. simply because of the fact that the correction method used, compensates for heat and other factors more in shootout mode than other modes

Edited April 16, 2006 by Kryostaisis

[thizzle]

  Kryostaisis said:

ive seen a few have that aswell, mines got 297rwkw on stock internals, but ive also seen a few around the 300rwkw mark on a low reading dyno have their pistons crack, under a conservative tune aswell

in the end its completely up to the owner of the car, if you are willing to risk your engine blowing then by all means, boost it up and tune it up well. otherwise rebuild your bottom end then work from there

most dynos use the shootout mode for power runs, its a common fact, on shootout mode, the dyno will give a higher reading than if they used another mode. simply because of the fact that the correction method used, compensates for heat and other factors more in shootout mode than other modes

no doubt...i agree

i would feel alot better about thrashin my car with a rebuilt bottom end..

i still think the 25 is under estimated tho..

[paulr33]

so whats the point of dialing in more hotter air?

[khunjeng]

  paulr33 said:

1 bar on stock turbo = same as 12psi

so that extra 2psi is just more heat

likely to make it go bang

Just cos I was confused :

1 bar = 14.5psi

so I assume he means the extra 2.5psi is lost cos of the extra heat.

hehe

Edited April 17, 2006 by khunjeng