[renns]

What EWG spring pressure should I be looking at to buy for a VF39 pushing 21 lbs of boost with meth. The EWG would be a Tial 44mm.

I did search, both on here and google, but I haven't really found an answer.

[neverendingmods]

Get a spring for whatever PSI you wanna hear raaaahhhhhhhhhh come into play. I use a 1 bar spring. Some use .9 and some 1.2bar. I like the higher spring(1.0) because I can get into some boost, say 8-10psi and it's just at the point of WG opening but not quite. Not scaring the crap out of old ladies in other lane. I use the 1.0bar spring for vf39 and am getting ready to try it out on a bigger turbo soon. I may go to a 1.2 bar than. We'll see how it works out.

[Flycaster]

What boost control system? The answer depends on how strong your solenoid is.

[renns]

The boost controller would likely be a TurboXS HPBC. If not that, then possily a Perrin MBC. It depends what my tuner has in stock.

So basically though, the spring pressure is arbitrary to the efficiency of the EWG, and as long as it is under the max. boost pressure at WOT, there isn't any reason to pick a certain spring pressure other than the noise it will make?

[neverendingmods]

Originally Posted by renns

The boost controller would likely be a TurboXS HPBC. If not that, then possily a Perrin MBC. It depends what my tuner has in stock.

So basically though, the spring pressure is arbitrary to the efficiency of the EWG, and as long as it is under the max. boost pressure at WOT, there isn't any reason to pick a certain spring pressure other than the noise it will make?

^ Pretty much. I'm using prodrive ebcs solenoid and it keeps up just fine. A good manual controller is fine too. Just make sure you get tuned right away so everything is in harmony. Don't go "trying it out" untuned.

[PhantomSTi]

Originally Posted by renns

The boost controller would likely be a TurboXS HPBC. If not that, then possily a Perrin MBC. It depends what my tuner has in stock.

So basically though, the spring pressure is arbitrary to the efficiency of the EWG, and as long as it is under the max. boost pressure at WOT, there isn't any reason to pick a certain spring pressure other than the noise it will make?

I, like you thought that the WG spring didn't make THAT much difference. Apparently it does, my tuner told me to get a 1bar spring atleast, but since I was crunched on time and needed to get the car tuned the next day, I had to use the 5psi spring that was already in the WG. My tuner told me that I could achieve less lag/spool time if I upgraded to a 1 bar spring, he even went to the extent to say "Get a 1 bar spring, and if you can get a slightly bigger one." This amazes me, because I already hit peak torque at 3800rpms

One thing I'll miss though is the WG opening at 5lbs.. It's hilarious. I had the joy of a Brand New Ford Pickup (Turbo Diesel) cut me off and floor it infront of me. He thought it was pretty cute that his exhaust covered my car for that fraction of a second. So, I managed to change lanes pulled up right next to him and it went something like this.

Me: Looks over to my right to see if his window is down.
Me: Window Down? Check
Him: Looks at me grinning
Me: Applies brakes with left foot, and floors it with the right.
Him: ?!

Boost skyrockets and he's now legally deaf.

Him:

Edit: I also have a Prodrive BCS

[renns]

Originally Posted by neverendingmods

Don't go "trying it out" untuned.

The EWG is going to be put on by the tuner and tuned in the same session, along with meth. Once the boost controller is set by the tuner, I wont be touching it again. I wouldn't be buying it in the first place if I didn't need it just to control the EWG.

[Flycaster]

All the spring does is assist the controller solenoid to hold the EWG open. Most solenoids can hold about 10-15 lbs before you run out of WGDC's. If all you're shooting for is 21 psi, a .6-.9 bar spring should be ample.

However, since you're running meth, you should have a spring pressure that is LESS than the initial starting pressure for your meth system. That way, if the meth system fails, you can't boost above the level that the car is tuned for to run on meth. It's a failsafe - if the system fails you simply turn the controller off and run off spring pressure (if your system does not do this automatically). Do you follow me here?

[renns]

Originally Posted by Flycaster

All the spring does is assist the controller solenoid to hold the EWG open. Most solenoids can hold about 10-15 lbs before you run out of WGDC's. If all you're shooting for is 21 psi, a .6-.9 bar spring should be ample.

However, since you're running meth, you should have a spring pressure that is LESS than the initial starting pressure for your meth system. That way, if the meth system fails, you can't boost above the level that the car is tuned for to run on meth. It's a failsafe - if the system fails you simply turn the controller off and run off spring pressure (if your system does not do this automatically). Do you follow me here?

I see what you're saying about the meth. I'll have to check when the initial starting pressure is, but I'd assume that it's over 10 PSI. The system is an Aquamist HFS5, which seems like the safest choice, especially considering the failsafes it has to begin with. When you say a .6-.9 bar spring is ample, though, would there be a better option if I was thinking down the line? Eventually I'd like to put on a 20G to a Green sized turbo.

I appreciate your help.

[PhantomSTi]

Originally Posted by renns

I see what you're saying about the meth. I'll have to check when the initial starting pressure is, but I'd assume that it's over 10 PSI. The system is an Aquamist HFS5, which seems like the safest choice, especially considering the failsafes it has to begin with. When you say a .6-.9 bar spring is ample, though, would there be a better option if I was thinking down the line? Eventually I'd like to put on a 20G to a Green sized turbo.

I appreciate your help.

I'm running the same Aquamist HFS-5 as you on a Green, and my tuner simply recommended me to go to a bigger WG spring. Although, Flycaster's comment certainly makes perfect sense.

Come to think about it, my tuner also mentioned to me that after I add my FMIC he'll most likely be upping the boost around to 26-27psi on the Green. So, this is quite a bit different then 21psi.

[Flycaster]

Originally Posted by renns

...When you say a .6-.9 bar spring is ample, though, would there be a better option if I was thinking down the line? Eventually I'd like to put on a 20G to a Green sized turbo...

My suggestion would be to try a .9bar (8.5lb) spring and see how that works for you. I use that with an Aquamist as well (set to fire above 10 psi), with an AVC-r controller, and I can hold up 24 psi and not have the WGDC's get funky. Above 25 psi, however, it needs a 1 bar spring otherwise I end up with a crazy upward ramp in WGDC's that is really dangerous. One of the keys is to end up with a WGDC map that is fairly level once full boost is achieved, and you really don't want to have to program any dutycycles in that are much over 70%.

If I knew that I was going to run 24+ a lot of the time, I'd use the 1 bar spring and adjust the AM to start injection at 15-16 psi so I could maintain that safety feature. Frankly, the additional power (mostly from timing) that you get below that level of boost is not all that important anyway. You blow through that in an instant at WOT.

[UrbanGunz]

Running a 1bar spring in my Tial 44mm on vf39

[gohrsepwr]

i have a question about this topic, the spring in my 38mm egw is holding boost to 14 psi, my tune is wednsday, will the eboost 2 be able to push 30 psi with this spring?
edit: topic shoud be sticky!

[JDM-STI]

Originally Posted by gohrsepwr

i have a question about this topic, the spring in my 38mm egw is holding boost to 14 psi, my tune is wednsday, will the eboost 2 be able to push 30 psi with this spring?
edit: topic shoud be sticky!

No. You usually cant run more than double your spring pressure. And if you can, you shouldn't IMHO.

[13onesti]

i used a 1 bar spring on my 38mm Tial EWG w/ Hallman MBC i push my Stock turbo (vf39) 25psi

and i have gotten badass result..

i think i was one of few first folks to run EWG on stock turbo setup. back then " it was forbiddin cuz it dangerous " hhaah