Hey,

So i am purchasing the Tial 46 mm Waste Gate. I will Be running a TO4R ar 1.00 for street /strip use. You reckon a 0.8 bar spring is fine?

Thanks

George

 

It depends on how much boost you want to run. How much do you plan on running at any given time?

 

15 -17 psi for street use...

 

that spring would be fine then... you could probably even stand to go with a weaker spring. Just try not to run more boost than double the spring weight.

 

Why?

Thanks
Joe

 

You should keep spring pressure within a few pounds of desired boost pressure, otherwise you will likely have wastegate diaphragm oscillation.

-S-

 

Thanks

 

oh....ok...thanks a million.

so if i intend to run 20 psi, i stick to a minimum of a 10psi....right?

Thanks

George

 

I would say if your running 20lbs I would run no less than 17lb spring.

-S-

 

I have a GT35R, stock ports, and my Tial 46mm WG came with the 7.25 lb spring. No matter what I did to my boost controller settings, I could not get over 13psi boost by 3600rpm when running 15psi max boost.

I installed the 10.15 lb spring and now have 14psi by 3600rpm.

So a heavier spring will help the turbo to spool a little faster.

 

hmmmmm thanks mate...
so i'll order a 10 psi spring...... should get me close to what i want...

 

A stiffer spring will help with crisper response, but a 10lb spring on 20lbs is not going to be adequate.

 

yes, but i intend to run 15-17 psi..... what would you recommend?


(ps, off topic, Zero R...nice info on the turbo sizing and reducing lag......)

 

1bar spring, and thanks I will get more info when I have time.

 

I really need to get a stiffer spring in my tial 44mm gate. Mine only came with a .5 bar spring and I'm running 21lbs on the street. Given this is a wrx and not a rx7 and the boost does hold fine but I never thought about the spool up as much until now. Need to get at least a 1.2 bar (probably have to use a small and big spring) and that should help spool as the gate will stay shut while the turbo is spooling all the way till the last second.

 

1 bar spring it is.... makes sense.....but correct me is i am wrong.... the minimum boost i can run is 14.7 psi right?
I run an Apexi AVCr,so i cant figure if the waste gate opens by spring pressure past the 1 bar, whats the point of a boost controller, you still cant force it close, and so exhaust will vent out by 14.7...not before not after.....

sound stupid i know....but confusing

 

Spring pressure will be minimum pressure yes. If you run spring pressure where you want your boost pressure you can get away with no BC. but not always. I've seen poor designed manifolds that let the boost still flutter too much. It's really up to how accurate you want to be with it.

 

DOH!!! so i bought an avcr for f+++ all!!

hehe.... well i am ordering a i bar spring.....

 

I would still use some sort of boost control, it can smooth out fluctuations, help with response,and allow you to run higher boost when your ready, so your good to go. No worries.

 

thanks....made me feel better.!!!

I hope the Tial 46mm is good for my application...