Twin s366 wastegates too small or?
I knew it wasnt ideal but i have seen worse that have worked decent. It is 90 degrees off the collector for sure. i have the bends there so it landed in the collector vs landing on a single tube and getting the gates where i wanted them. Its my first attempt at a turbo setup and i didnt think it would be a huge issue.... Oh well
Im going to vent the gates to atmosphere and see what happens, if all else fails the car runs pretty good as is
Thanks for the suggestions/info.
Im going to vent the gates to atmosphere and see what happens, if all else fails the car runs pretty good as is
Thanks for the suggestions/info.
Well just after the turbine is a turbulent area. May be alittle more difficult for the gases to merge with that flow and being that the wastegate stream is of higher pressure. Merging with flow path angle would help but 90 in has worked. Downstream alittle further would be better imo as the flow had a chance to straighten out. Just an idea to help but certainly may not be a total cause of your issues
For what its worth my friend is fighting the same battle currently. 400sbc, twin billet 366s with turbosmart 40mm gates. His boost increases the longer he stays at WOT. Another friend changed the wastegate priority from 90 degrees like yours are and routed in the down pipes to force fed(very good priority) and dumped the gates to atmosphere... still over boosting. Im thinking it needs huge gates.
For what its worth my friend is fighting the same battle currently. 400sbc, twin billet 366s with turbosmart 40mm gates. His boost increases the longer he stays at WOT. Another friend changed the wastegate priority from 90 degrees like yours are and routed in the down pipes to force fed(very good priority) and dumped the gates to atmosphere... still over boosting. Im thinking it needs huge gates.
9 Second Club
Joined: Nov 2003
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From: Norn Iron
Rotating the gate around, that would be an easy test.
But IMO it will not fix the problem. Work with the gates so they are installed as normal, but the poppet valve inside is maintained in a fully open position. That way you're testing the gates max flow as it is installed in the car.
If you cannot get boost down, you need a larger pair of gates.
The Tial 44's may be a straight swap, or maybe Precisions 46mm
Thread Starter
Staging Lane
Joined: Mar 2011
Posts: 59
Likes: 0
From: Sealy TX
So heres what i did.
Flipped them to open to atmosphere... No change
Removed springs so they were wide open to atmosphere... No boost
Teed in gauge where they tie into cold side, same pressure as boost gauge that is on intake manifold so they are getting refrence
To verify i pulled hoses off of the gates, got 25 psi REAL quick where i would normally have 10. So the gates are doing something.
I moved the refrence to the intake for the heck of it, no change
i may do what i can to the area where the gates hit the collector and see what happens, if no change then id guess bigger gates it is.... Or just enjoy 15+ psi all the time! Ha
Flipped them to open to atmosphere... No change
Removed springs so they were wide open to atmosphere... No boost
Teed in gauge where they tie into cold side, same pressure as boost gauge that is on intake manifold so they are getting refrence
To verify i pulled hoses off of the gates, got 25 psi REAL quick where i would normally have 10. So the gates are doing something.
I moved the refrence to the intake for the heck of it, no change
i may do what i can to the area where the gates hit the collector and see what happens, if no change then id guess bigger gates it is.... Or just enjoy 15+ psi all the time! Ha
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Verdad Gallardo 9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
So heres what i did.
Flipped them to open to atmosphere... No change
Removed springs so they were wide open to atmosphere... No boost
Teed in gauge where they tie into cold side, same pressure as boost gauge that is on intake manifold so they are getting refrence
To verify i pulled hoses off of the gates, got 25 psi REAL quick where i would normally have 10. So the gates are doing something.
I moved the refrence to the intake for the heck of it, no change
i may do what i can to the area where the gates hit the collector and see what happens, if no change then id guess bigger gates it is.... Or just enjoy 15+ psi all the time! Ha
Flipped them to open to atmosphere... No change
Removed springs so they were wide open to atmosphere... No boost
Teed in gauge where they tie into cold side, same pressure as boost gauge that is on intake manifold so they are getting refrence
To verify i pulled hoses off of the gates, got 25 psi REAL quick where i would normally have 10. So the gates are doing something.
I moved the refrence to the intake for the heck of it, no change
i may do what i can to the area where the gates hit the collector and see what happens, if no change then id guess bigger gates it is.... Or just enjoy 15+ psi all the time! Ha
Really...are you suuuuurreeee the springs are/were what you think they were ?
A single 1/4 line to both gates should not pose a problem.
If there is a lot of leakage past the shaft of the valve, I guess you could either run dedicated lines each, or a larger 5/16" line. There will always be some leakage past the shaft though.
And back to springs, are you sure they arent coil binding, catching on something inside etc ? Nothing limiting the travel of the valve ?
Thread Starter
Staging Lane
Joined: Mar 2011
Posts: 59
Likes: 0
From: Sealy TX
Like i said they bench test great, i havent actually put a gauge to them while bench testing but it doesnt take much to open them.
They were vented to atmosphere durring that test
Maybe if they are open from the start with no boost it will not build boost vs. opening with boost and not being able to keep up? Ill mess with it some more this evening
They were vented to atmosphere durring that test
Maybe if they are open from the start with no boost it will not build boost vs. opening with boost and not being able to keep up? Ill mess with it some more this evening
On The Tree
Joined: May 2012
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Have you applied pressure to the gates and looked for leaks? What would be best is apply a fixed amount of air off of your reference with everything on the car and see if it leaks down. I had a turbonetics new gen on my single setup at a straight up 90° right before my Garrett tv7511 and could run 7#'s .
Thread Starter
Staging Lane
Joined: Mar 2011
Posts: 59
Likes: 0
From: Sealy TX
After a longer test drive turns out it DOES build boost with spring removed, just not as much and not near as fast, will hit 5-6 psi with no springs. My first time doing that was a a couple quick test hits.... I tried again because i knew it couldnt be right.
I may try to improve on the location a bit, which im sure will help, but my non expert opinion says bigger gates would probably be needed
Ill keep ya updated. Thanks!
I may try to improve on the location a bit, which im sure will help, but my non expert opinion says bigger gates would probably be needed
Ill keep ya updated. Thanks!
After a longer test drive turns out it DOES build boost with spring removed, just not as much and not near as fast, will hit 5-6 psi with no springs. My first time doing that was a a couple quick test hits.... I tried again because i knew it couldnt be right.
I may try to improve on the location a bit, which im sure will help, but my non expert opinion says bigger gates would probably be needed
Ill keep ya updated. Thanks!
I may try to improve on the location a bit, which im sure will help, but my non expert opinion says bigger gates would probably be needed
Ill keep ya updated. Thanks!
Was this done with gates vented to atmosphere or to downpipe?
9 Second Club
Joined: Nov 2003
Posts: 13,616
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From: Norn Iron
After a longer test drive turns out it DOES build boost with spring removed, just not as much and not near as fast, will hit 5-6 psi with no springs. My first time doing that was a a couple quick test hits.... I tried again because i knew it couldnt be right.
I may try to improve on the location a bit, which im sure will help, but my non expert opinion says bigger gates would probably be needed
Ill keep ya updated. Thanks!
I may try to improve on the location a bit, which im sure will help, but my non expert opinion says bigger gates would probably be needed
Ill keep ya updated. Thanks!
Really you may be able to much about, cut/re-weld and gain some benefit and it might get you where you need. The operative word being might.
With larger gates, there is little doubt it will achieve what you need.
Thread Starter
Staging Lane
Joined: Mar 2011
Posts: 59
Likes: 0
From: Sealy TX
Changed things up a bit while actually building the engine for boost.
More ideal mounting in my opinion. Also went from 1.5" tubing to 1.75" into the gates.
Went the path of least resistance with the wastegate dumps as well
Should get it fired up this evening and ill post results
More ideal mounting in my opinion. Also went from 1.5" tubing to 1.75" into the gates.
Went the path of least resistance with the wastegate dumps as well
Should get it fired up this evening and ill post results