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Old 03-09-2014, 09:43 PM   #1
91shelbydaytona
 
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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?
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94 1500 RCSB 12v, Joker Fabrication, Farrell Diesel Service, Hamilton Cams, Airdog
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Old 03-10-2014, 10:27 PM   #2
Extended Power
 
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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.
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2003 Ford KingRanch F-350 4x4
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12.2 @ 113.06mph


If It Ain't Broke...Fix It Until It Is!!!
 
Old 03-11-2014, 08:34 AM   #3
Backhoe man
 
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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.
 
Old 03-11-2014, 09:13 AM   #4
jgsturbo

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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.
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Old 03-11-2014, 09:16 AM   #5
jgsturbo

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Quote:
Originally Posted by Backhoe man View Post
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.
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JGS Precision Turbo Control Products
 
Old 03-11-2014, 09:36 AM   #6
91shelbydaytona
 
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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.
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Old 03-11-2014, 02:45 PM   #7
Backhoe man
 
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Quote:
Originally Posted by jgsturbo View Post
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
 
Old 03-11-2014, 06:05 PM   #8
Extended Power
 
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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?
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If It Ain't Broke...Fix It Until It Is!!!
 
Old 03-11-2014, 08:35 PM   #9
jgsturbo

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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.
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Old 03-11-2014, 08:44 PM   #10
jgsturbo

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Quote:
Originally Posted by Backhoe man View Post
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.
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Old 03-11-2014, 08:54 PM   #11
Extended Power
 
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Quote:
Originally Posted by jgsturbo View Post

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.

Click the image to open in full size.


And the one I picked up today from Colin.

Click the image to open in full size.


I'm not trying to start anything...I love the JGS wastegates and BOVs.
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2003 Ford KingRanch F-350 4x4
793HP fuel only
12.2 @ 113.06mph


If It Ain't Broke...Fix It Until It Is!!!

Last edited by Extended Power; 03-11-2014 at 08:56 PM.
 
Old 03-11-2014, 09:42 PM   #12
jgsturbo

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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.
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Old 03-11-2014, 10:07 PM   #13
Extended Power
 
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Oh crap...I thought it had o-rings like the one I already had.
Damn...

Are they still serviceable? (The old diaphragm style?)
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2003 Ford KingRanch F-350 4x4
793HP fuel only
12.2 @ 113.06mph


If It Ain't Broke...Fix It Until It Is!!!
 
Old 03-11-2014, 11:04 PM   #14
jgsturbo

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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.
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Old 03-12-2014, 12:27 PM   #15
Extended Power
 
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Quote:
Originally Posted by jgsturbo View Post
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...

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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2003 Ford KingRanch F-350 4x4
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12.2 @ 113.06mph


If It Ain't Broke...Fix It Until It Is!!!
 
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