elessiare

TII with BNR is not good too pass over the 8psi?.
I have bought an BNR stage 1 to replace my stock turbo.I Have choose the bnr because its like the stock turbo and with wastgate porting service,and a good power margin. After installing (with a manual boost controller Greddy),I cant pass over the 8/9psi.
Possibly problem with the watsgate porting or the actuator?
any suggestion or solution?
Thanks ^_^

10thaniv

iTrader: (1)

Yes, wastegate issue, Mine does the same. I had to add a helper spring to keep wastegate closed and still only managed 10psi. Some day I will take the turbo off the car and get it working right.

GrossPolluter

iTrader: (1)

my wasteaget doesn't look like im able to open it up to change the wastegate spring. How did you do yours?

SpikeDerailed

iTrader: (7)

Add a spring to the end of the flapper arm of the waste gate itself and connect the other end of the spring to where the canister is for the WG actuator. The extra spring tension helps hold the WG flapper closed. The stock spring in the actuator is still only 5.5-6psi, once you have more pressure than that in the turbo exhaust housing, exhaust back pressure it can push the flapper open even if the mbc isn't allowing manifold pressure to the actuator at the time.

Kinugawa sells wastegate actuators for s5 turbos with replaceable springs and diaphragms, I think im going to try that out on my personal car soon.

GrossPolluter

iTrader: (1)

I had a hybrid to4b turbo before and reused the stock wastegate and was actually at 10psi without any boost control.

I actually purchased a kinugawa wastegate, they come with 14psi springs, but my goal is less than that. I purchased a 10psi spring to install on my wastegate and the diaphragm did not go back together properly. When I contacted them, they were saying there was a diference in the diaphragm sizes and they were not able to supply me with the proper sized diaphragm so I could use their product. I ended up returning it. If you want 14psi or more, I would say go for it and never open it up to change springs. With a rotary engine, on a hybrid turbo, and a wastegate that says 14psi, I would expect 16psi or more. I rather not risk another engine.

I work as a car tech, and I have rebuilt wastegates before and it was never as difficult as the kinugawa one. I spent hours trying to rebuild it before I contacted them and found out there was a diference in diaphragm sizes and that they were unable to supply the correct one. The people at kinugawa were very helpful even though I was having trouble with their product.

elessiare

Ok ,I don't wanna be mannerless but,not a good product if the BNR has this setting..I thought I could get to 14psi (1bar) of limit.I am very disappointed, and bewildered(I dont know if this is the right word in English).
I imagined to solve the problem by buying an kinagawa actuator,but if its complicate (like Gross said) I dont know,I am from overseas, has already been complicated returning or solve problem.
You say the kinagawa with 14psi spring dont have problem for installing,and work,without risk?
Some other person with same experiences?

GrossPolluter

iTrader: (1)

Did you already try adjusting the rod on the bnr Watergate?

I haven't checked, but another forum member just notified me you can purchase the kinagawa unit with desired spring. You can give that a try. Maybe they sell it with desired spring pressure after I returned my unit. Unless maybe someone had experience with the kinagawa unit. I just did not want to go over 14psi since all I have is 91 octane

Nick_d_TII

iTrader: (6)

Maybe your boost controller is hooked up wrong or maybe your WG has issues. You should have no problem boosting over 8.

bumpstart

if you have a fixed can arm length , then it is in the clocking of the front and rear sections not placing enough initial tension on the can arm

else you have an exhaust restriction after the turbo.. or a leak before it ..

if you have an adjustable can.. then you need to wind in more tension by making the arm shorter

if you have a fixed can and it opens makes setpoint,, but falls away rapidly
then you have either exhaust restriction .. or you need to add the external helper spring

- just a bed spring and a small hole drilled into the end of the can arm
,, and into the can bracket , with the spring stretched out between them

i have done variation with the spring stretched along the can arm,, and ones that run about a 15 degree angle with it
...both choices work fine


the low boost is not a fault of the turbo.. only the setup