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-   -   What size wastegate? (http://www.competitiondiesel.com/forums/showthread.php?t=167416)

91shelbydaytona 03-09-2014 10:43 PM

What size wastegate?
 
On my 12v with a 62/68 over s475 or possibly s478, Which size gate do you recommend for feeding the primary? Should I be looking at the 40mm or 50mm?

Extended Power 03-10-2014 11:27 PM

This is only my opinion...but if I had to do mine over, I would rather error on the bigger side of gates. That leaves room to grow, if you ever add more fuel and air.
Going too small is just useless...

You can open the bigger gate "less" than 100%...but you can't open the smaller gate "more" than 100%.

....see what Lance has to say.

Backhoe man 03-11-2014 09:34 AM

I just talked to Lance about this, he said 40 is easier to control. I have a 50 and can not seem to make it happy.

jgsturbo 03-11-2014 10:13 AM

I think on fuel only, the 40mm will control that secondary very well.
I'd only recommend the 50 if you had plans for big nitrous.
We need to size the gate for charger its controlling (with respect to desired PR). And our 40mm easily handles a 68mm turbine.

jgsturbo 03-11-2014 10:16 AM

Quote:

Originally Posted by Backhoe man (Post 2271713)
I just talked to Lance about this, he said 40 is easier to control. I have a 50 and can not seem to make it happy.

In a compound / wg reroute setup or a Single or WG dump setup?
Big difference in pr across the gate.

91shelbydaytona 03-11-2014 10:36 AM

I do have a nitrous kit, but if i ever decided to install it i would rather install a second gate to have total control over boost.

Backhoe man 03-11-2014 03:45 PM

Quote:

Originally Posted by jgsturbo (Post 2271731)
In a compound / wg reroute setup or a Single or WG dump setup?

Big difference in pr across the gate.


It's a single gated into the exhaust system, s400 charger with a 74/83 turbine

Extended Power 03-11-2014 07:05 PM

Sorry to high jack here...

Lance, my secondary is a 68mm, and my primary is a the S480/96/1.32

I had one 38mm JGS gate, but no matter what, drive pressure remained at over 100 psi.

Just picked up a second 38mm gate, so I can run one on each bank.

Was this a good idea, or should of I went with a single 50mm?

jgsturbo 03-11-2014 09:35 PM

If the waste gate isn't getting good direct flow from both banks you will get poor gate performance.
We see this in turbo gas V8s all the time, installation on a inline motor is more straight forward and predictable.

BTW- We don't build a 38mm wastegate, never have.

jgsturbo 03-11-2014 09:44 PM

Quote:

Originally Posted by Backhoe man (Post 2271935)
It's a single gated into the exhaust system, s400 charger with a 74/83 turbine

Single setups like this do have problems using a 50mm correctly, the large pressure drop across the gate makes a 50mm gate flow a metric ton more than if it was breathing back into a 20-40psi hot pipe.

Extended Power 03-11-2014 09:54 PM

Quote:

Originally Posted by jgsturbo (Post 2272156)

BTW- We don't build a 38mm wastegate, never have.

Well, then they are 40mm.

Here's the one I used last summer....needs some new o-rings.:hehe:

http://i1141.photobucket.com/albums/...r/image-52.jpg


And the one I picked up today from Colin.

http://i1141.photobucket.com/albums/...r/image-55.jpg


I'm not trying to start anything...I love the JGS wastegates and BOVs.

jgsturbo 03-11-2014 10:42 PM

Dirty! Its all good, just a reminder :)
The second one is a much older diaphragm model so be careful with it.

The V-band 40mm does seem to flow better than the old 2 bolt model.

Extended Power 03-11-2014 11:07 PM

Oh crap...I thought it had o-rings like the one I already had.
Damn...

Are they still serviceable? (The old diaphragm style?)

jgsturbo 03-12-2014 12:04 AM

We ditched the diaphragm quite a few years ago. They were expensive and people wanted to use pressure to close the gate.
We had to buy $8K of them at a time as well.

We do offer an upgrade service to install piston hardware for $100.

Extended Power 03-12-2014 01:27 PM

Quote:

Originally Posted by jgsturbo (Post 2272268)
We ditched the diaphragm quite a few years ago. They were expensive and people wanted to use pressure to close the gate.
We had to buy $8K of them at a time as well.

We do offer an upgrade service to install piston hardware for $100.

Augh...:bang

Can you PM me a price for 2 new 40mm gates that have the Vband connections please?

To all: I am selling both of my 40mm JGS gates that are flange mount.
The one I own will have new O-rings installed.
The one I bought from Collin will come just the way he posted it in the for sale section.


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