Changing wastegate spring
03-05-04, 09:12 AM
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Changing wastegate spring
I've got a Turbonetics Deltagate Mark II Wastegate and it *seems* like it's got a 15 lb spring (I can't verify it for sure though). I'm pretty sure there isn't a manual boost controller, but the guy before me said it ran 10 lbs boost.
Does anyone know of a good writeup on changing a wastegate spring and what all is involved? I would think it's pretty simple, just remove the four (or six?) bolts slowly so it doesn't fly off, take the (locknut?) off the spring side and take the spring out, put the new spring in, locknut on, bolt it back up, and go? Are there any gaskets in there that need to be replaced too?
Does anyone know of a good writeup on changing a wastegate spring and what all is involved? I would think it's pretty simple, just remove the four (or six?) bolts slowly so it doesn't fly off, take the (locknut?) off the spring side and take the spring out, put the new spring in, locknut on, bolt it back up, and go? Are there any gaskets in there that need to be replaced too?
03-05-04, 09:55 AM
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Locknut doesn't need to be removed.
It helps to have a spare diaphragm - they don't seem to last very long,
Also if you're putting in a stiff spring, have some extra long screws handy to help you get started putting the actuator back together. A stiff spring can make it a real pain sometimes. (Long screws can help you line it up initially)
I should mention that the psi rating of the spring is merely a suggestion - I've had "12 lb" springs give me like 7 psi. There are other factors involved than just the spring.
It helps to have a spare diaphragm - they don't seem to last very long,
Also if you're putting in a stiff spring, have some extra long screws handy to help you get started putting the actuator back together. A stiff spring can make it a real pain sometimes. (Long screws can help you line it up initially)
I should mention that the psi rating of the spring is merely a suggestion - I've had "12 lb" springs give me like 7 psi. There are other factors involved than just the spring.
03-05-04, 01:59 PM
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The diaphragms run about $25 each as I recall... I used to blow them fairly often, but placement may have been a problem (actuator getting too hot).
Spring tension is subject to heat (hot spring gets softer, then boost falls off).
Also remember that exhaust pressure is trying to shove the valve open. This is a bigger problem with small actuators/big valves - Shouldn't be too bad with a Deltagate.
Spring tension is subject to heat (hot spring gets softer, then boost falls off).
Also remember that exhaust pressure is trying to shove the valve open. This is a bigger problem with small actuators/big valves - Shouldn't be too bad with a Deltagate.
03-05-04, 02:06 PM
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The diaphragms run about $25 each as I recall... I used to blow them fairly often, but placement may have been a problem (actuator getting too hot).
Spring tension is subject to heat (hot spring gets softer, then boost falls off).
Also remember that exhaust pressure is trying to shove the valve open. This is a bigger problem with small actuators/big valves - Shouldn't be too bad with a Deltagate.
Finally, remember that the gate doesn't "stay shut until x psi, then open". In reality, it starts opening at some psi, then gradually opens more with increasing psi. How much boost you get depends on how sensitive your setup is to this "controlled leak".
Spring tension is subject to heat (hot spring gets softer, then boost falls off).
Also remember that exhaust pressure is trying to shove the valve open. This is a bigger problem with small actuators/big valves - Shouldn't be too bad with a Deltagate.
Finally, remember that the gate doesn't "stay shut until x psi, then open". In reality, it starts opening at some psi, then gradually opens more with increasing psi. How much boost you get depends on how sensitive your setup is to this "controlled leak".
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