Ct26 turbo charger waste-gate weld?

kcahrens · 02-07-2011, 06:14 AM

I understand what the waste-gated does, It opens at idle /low rpms and controls the speed of the turbine (feel free to elaborate or correct my thoughts). It is to my understanding that if the waste gate were to be permanently (via weld) shut that the idle spool of the turbo would be greater therefore less spool up time. Is there any down side to this? There must be some reason to have a waste gate other than spooling the turbo at a lower rate during idle/low rpms. Would it effect the life/heath of the turbo or engine or an other parts?

cre · 02-07-2011, 06:53 AM

The other way around... it open as manifold pressure increases to slow the exducer so you don't exceed a given target. Keeping it closed and you'll over boost very frequently and risk THOROUGHLY trashing something (see: turbo and/or engine).

The ONLY gain you see in not letting the waste gate open is that you will see less smooth of a drop off as you reach the target boost and the gate opens completely... Usually this presents as a surge... not too good for things but not a killer...

There's really nothing to be gained from what we've discussed here.. you're better off leaving it all alone. Go read up some more and then read up on boost controllers.

02-07-2011, 06:14 AM	#1
kcahrens Stock Join Date: Jan 2011 Location: Seattle Washington Posts: 16	Ct26 turbo charger waste-gate weld? I understand what the waste-gated does, It opens at idle /low rpms and controls the speed of the turbine (feel free to elaborate or correct my thoughts). It is to my understanding that if the waste gate were to be permanently (via weld) shut that the idle spool of the turbo would be greater therefore less spool up time. Is there any down side to this? There must be some reason to have a waste gate other than spooling the turbo at a lower rate during idle/low rpms. Would it effect the life/heath of the turbo or engine or an other parts? __________________ 88 Supra Tegra 7M-GTE Manual Seattle, Washington (Granite Falls)

02-07-2011, 06:53 AM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	The other way around... it open as manifold pressure increases to slow the exducer so you don't exceed a given target. Keeping it closed and you'll over boost very frequently and risk THOROUGHLY trashing something (see: turbo and/or engine). The ONLY gain you see in not letting the waste gate open is that you will see less smooth of a drop off as you reach the target boost and the gate opens completely... Usually this presents as a surge... not too good for things but not a killer... There's really nothing to be gained from what we've discussed here.. you're better off leaving it all alone. Go read up some more and then read up on boost controllers. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

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