max boost on vg30 turbo?

[JH32]

What is the max boost I can run with a VG30 turbo on an RB20 engine?

With stock cooler?

With new FMIC?

I think it is a ball bearing with ceramic wheel?

could be wrong though ...

cheers

[Cubes]

APPARENTLY..

Don't quote me on this but I questioned tim at rpm and he told me that it should be able to run 16-17psi reliabily.

Due to the RB20det motor being smaller than say a VG30 and it doesn't consume as much air per second at max revs compared to the vg30 therefor the rpm speed of the shaft wont be as fast as if it were on the vg30.

Make sense.

What causes damage on the ceramic turbo's is the overspeeding (rpm) it will make the exhaust wheel seperate from the shaft.

I'm not sure how much boost will be able to run on the stock ic, in winter you will be able to get away with more boost than summer obviously.

Also make sure your fuel pump is up to the task as running say 12psi on the vg30 is like 14 on the std rb20 item.

Do an oil change when slapping the new terbs on also.

New fmic i would map the ecu to 16 or 17 psi depending on how the power levels go on the dyno.. Basically they set the boost for max power as more boost doesn't always = more power.

Be carefull if you have the stock fuel pump...

[JH32]

Cheers for that mate

Might upgrade the pump then

Do you need one of those rising pressure regulators?

What are they for exactly?

[adam 32]

they are a cheap way of stopping the car from running rich due to bigger pump and increased fuel rail pressure.

personally i dont think you need one, there are better ways of management such as remap, AFC, or full replacement ECU

[rev210]

Originally posted by JiMiH

Cheers for that mate

Might upgrade the pump then

Do you need one of those rising pressure regulators?

What are they for exactly?

They help when the stock injectors are reaching the limits of duty. The extra fuel pressure gives them an extra kick in the guts. They also tend to hold a more consistant rise in pressure than the stockie (which is also a rising rate but not adjustable).

Whatsisname has a malpassi with a bigger pump and got the stock injectors to push about 230rwkw.

[JH32]

hmmm ok cheers guys

[Guest Cob@lt60]

hmmm, so your saying when i get my VG30 installed (soon) I'll have to up the boost a bit to compensate (to make it run like before)??

Also whats the theory behind the VG30.. is it bigger than the stocky.. or is it just stronger???

It's either a VG30 or an R33 turbo (not sure the model)

Preferences???

[PranK]

Cob@lt, welcome!

I remember chatting to you a LOOONG time ago on SDU.

The VG turbo is bigger AND stronger i think... i think it would be my preference over the two.

if you guys have no idea what i am saying, its cause i only read the last post.

[Cubes]

You can run more boost on the VG30 because it is bigger and doesn't have to spin as fast to provide the same psi as the smaller turbo hence you are able to run it at a higher psi before it overspeeds.

It will make more power with less boost than the smaller rb20det/rb25det turbo.

[Guest Cob@lt60]

Hey Prank (yeah i remember you ) & Joel

Anyway.. cool... ill be taking my beast to JMS next week to get the change over done (providing i can sell my mountain bike - is providing the funds). $800 all up for the VG30 non ballbearing and installation.

So if i run it at the same boost now.. (stock boost) will there still be a performance improvement...

I guess it just means that if i want to run it at 1 bar i can..

Are the wheels made from steel or what??? or are they still ceramic in the VG30??

To many questions... but i want to make a good investment..

[adam 32]

you will see a slight performance gain as he bigger wheels of the VG30 will flow more air at the given pressure as opposed to the RB20 turbo. it wont be much though...

[BOOSTMEISTER]

When I did mine I measured the wheels and found the exhaust wheels are the same on the vg and the rb turbo's but the comp wheel is slightly bigger....the main thing is that the comp housing is much bigger on the inside with the vg over the rb housing thus allowing more air to flow at lesser turbine RPM as mentioned before. I have been running mine at 15psi since installing and have not had any problems. By the way I have a vg30 turbo for sale for 20k and I will through in my car for free:uh-huh:

[Guest nismogtsx]

I had a VG30 turbo.....

Their great value for money i ran 12psi daily but i let go about

5000k's after installed due to oil flow problem.. LOL

Then i went to a T3/T4 and the difference inbetween the VG30 and

the hybrid is !!!!HUGE!!!!!!.... Guys im telling ya save up the cash

and go and get ya hands on a hybrid... Many R32 come over

with them on board now and they go for about $1,000....

They are worth their weight in gold....

[Cubes]

What sort of boost were u running on the t3/4 compared to the vg30... AND...... that t3/4 was using the std housing wasn't it.. AND... where (rpm) does it kick you in the back if you accelerate from low revs in second gear???

Lots of questions but it does give us a good indication

i.e the std turbo kicks at 3000rpm.

[HOLD64]

..just a question after reading through this thread. I'm putting 2 RB20DET turbos onto an RB30. These turbos are supposed to be ok up till around 14psi.

By what has been said on this thread - if I have the 2 of them then theoretically I should be able to run higher boost without fear of the turbo's crapping out coz each turbo wont have to flow as much air to reach the desired boost pressure - hence lower turbine speed? :burnout:

[Doctor]

With 2 turbos on, wouldn't the only thing that would change be the volume of air not psi. 2 turbos pumping out 12psi would still be 12psi but the volume of air would be almost double.

Correct me if I'm wrong.

Doc

[HOLD64]

..yeah - less volume of air required per turbo to reach the desired PSI, which in turn means less work for each turbo to reach the desired PSI.

eg. how much air the engine will swallow determines how hard the turbo has to work to maintiain a certain boost level. With 2 turbos they dont have to work as hard to maintain that same boost level.

...thats what I understand from the statements above anyhow?

[JH32]

shit

i just bought a ball bearing vg30 turbo :eek:

my bad

is this not as good as a non ball bearing turbo?

[Guest nismogtsx]

I ran 12psi on the VG30 and got like 150rwkw....

I then skuesed 17psi out of it and got 170rwkw....

The T3/4 starts to spool at about 2500rpm and then hits home at about 3500rpm.... At 3000rpm your on around 5psi and building but it spools fast once over 3000rpm the boost helps build the revs and in turn 17psi is reached and you are thrown back in ya seat..

So yes 3500rpm is fun time... But it only takes 1 second to get there... Much the same time is required for the VG30 to spool...

It is using standard housings... Well to a degree... The front half is nissan the rear is toyota.... Go figure... It cost me 3g's to have built..... But it is good for over 24psi.... I run 11psi daily and just touch it up for when power is needed... However 11psi is still enough to crap on most cars....

[Guest nismogtsx]

Max power i have achieved is 230rwkw on the standard auto...

5 months ago..... running 17psi with an iced cooler...

With the new cooler and manual trans going in over this next month i will be getting this as an everyday figure.... Hopefully the 250rwkw will be a twist of the bleed valve...