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Forced Induction Superchargers | Turbochargers | Intercoolers

what size wastegate do I need?

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Old Nov 4, 2010 | 07:04 PM
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Default what size wastegate do I need?
hey guys Im in the market for a wastegate. I have a masterpower T70 .96 on a ls1 with a turbo cam. down the road I might upgrade to a tc76. I was looking at getting a jgs 40mm gate, piston type. Will the 40 be big enough now and down the road if and when I ever upgraded the turbo.
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Old Nov 4, 2010 | 07:22 PM
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yes, it should be big enough, post a pic of how it is setup
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Old Nov 5, 2010 | 08:23 AM
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how much boost do you plan to run.
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Old Nov 5, 2010 | 08:27 AM
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Buy the 50mm
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Old Nov 5, 2010 | 09:53 AM
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Originally Posted by TiAL
how much boost do you plan to run.
This...
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Old Nov 5, 2010 | 10:42 AM
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Between 7 and 9 lbs its a stock bottom end
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Old Nov 5, 2010 | 11:04 AM
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never a bad thing to go bigger like a 50mm but if you can properly position a 38 then that will be a cheaper alternative and work well for that boost level.
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Old Nov 5, 2010 | 11:51 AM
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You can never have too much wastegate.
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Old Nov 5, 2010 | 12:11 PM
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Originally Posted by 'Trust'
You can never have too much wastegate.
sure you can, especially if you have high backpressure
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Old Nov 5, 2010 | 12:12 PM
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Originally Posted by 70c10
Between 7 and 9 lbs its a stock bottom end
minimum 44mm, i'd go with a 60 personally
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Old Nov 5, 2010 | 12:58 PM
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Originally Posted by TiAL
sure you can, especially if you have high backpressure
i went down that road. i put CO2 pressure on top of the gate to keep it shut. 43 lbs on a 4G63 with a JGS 50mm gate.
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Old Nov 5, 2010 | 01:24 PM
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I was running a tial 38mm w/8 psi last year. No issues.
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Old Nov 7, 2010 | 11:00 AM
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I'm running a tial 38 and never had an issue.
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Old Nov 7, 2010 | 01:51 PM
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It also depends on placement in the merge pipe as well. Its not all about size (no pun intended). You could have optimal placement and get away with a 38 or you could have really crappy placement and need a 44-60 just to squeak by. All depends on your plans for the kit. If you are going with a bigger charger down the road you're best off going big now and spending a little extra money to make sure you have what you need and only spend the money once. Just my input...
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Old Nov 8, 2010 | 01:03 AM
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Originally Posted by ninety4three4
It also depends on placement in the merge pipe as well. Its not all about size (no pun intended). You could have optimal placement and get away with a 38 or you could have really crappy placement and need a 44-60 just to squeak by. All depends on your plans for the kit. If you are going with a bigger charger down the road you're best off going big now and spending a little extra money to make sure you have what you need and only spend the money once. Just my input...
this is why i asked how it was setup. u could have a 100mm wastegate, but if its setup wring, it wont work
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Old Nov 8, 2010 | 01:39 AM
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so whats the proper placement for a wastegate?
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Old Nov 8, 2010 | 06:49 AM
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Originally Posted by red90cobra
so whats the proper placement for a wastegate?
What he said! Im in the same boat, going to run a mpt70 and planned on a 38-40mm.
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Old Nov 8, 2010 | 06:54 AM
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Originally Posted by TiAL
sure you can, especially if you have high backpressure
Originally Posted by 'Trust'
You can never have too much wastegate.
I think you guys are actually agreeing??

I'd run larger as well. For the extra ~$100 it's good to know you'll be safe. Even a 44 or 46 can be had around $300.
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Old Nov 8, 2010 | 07:27 AM
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Originally Posted by red90cobra
so whats the proper placement for a wastegate?
needs to be put in the direct flowpath of the exhaust gas pulling from all cyl, no 90* angles
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Old Nov 8, 2010 | 07:54 AM
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Originally Posted by TiAL
needs to be put in the direct flowpath of the exhaust gas pulling from all cyl, no 90* angles
While this is the ideal placement, if the build layout does not permit this, they usually work effectively at a 90* angle as well.
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