how do they work?
whats the difference between the sizes?
how can I go from internal to external?
doesnt the wastegate control the amount of boost capable of being produced
some are adjustable and some arnt. the adjustables can be set to allow different
amounts of boost before they open.
once the wastedgate [iguess detects] detects a certain amout of boost it then
opens up… letting the excess build by once it closes than boost is produced then the cycle repeats itself
i think the difference in sizes is the amount of boost one is capable of dealing with
the last one im unsure of
i guessing that the external needs some sort of aux. vacumun hook up to let it function
hope this is close and it helps
Originally posted by whitey
how do they work?whats the difference between the sizes?
how can I go from internal to external?
wastegates have a spring in them that allow the wastegate to open so it can only produce the amount of psi the spring is for.the bigger the wastegate the more effective it will be in preventing boost creep.
to go from internal to external u have to weld the internal gate shut and then tap ur exhaust manifold and weld a flange on to mount it.
Selection of the correct size/model wastegate is dependent upon several variables.
Bolt in compatibility. The 38mm and 46mm gates are made to be direct bolt in replacements for existing wastegates as well as custom setups. The 38mm gate is dimensional equivalent to the Turbonetics delta gate with many features not found in the delta gate. The 46mm gate is a drop in for the 930 Porsche turbo cars.
Flow capacity. Contrary to popular belief, larger higher HP applications do not necessarily require the largest wastegate available. The lower the boost pressure you are gunning for the larger your wastegate needs to be. An engine/turbo combination that is set to 25+psi has a smaller wastegate flow requirement than the same application set to 7 psi. This is because the wastegate is used to lower the boost not raise it, the lower the boost pressure is set the more flow the wastegate must allow.
The spring. TiAL wastegates are not adjustable. To change the boost pressure at which the valve opens requires changing the spring within the wastegate. Springs range from .3 Bar to over 1 Bar are available. The most common way to select your spring size is to pick a pressure rating that is a couple tenths or a bar or a few psi lower than the boost pressure you intend to operate the turbo/engine combo at. This way a boost controller can be used to adjust the opening point of the wastegate and help you fine tune to the exact pressure that is desired. This also allows adjustments to compensate for changes in atm pressure, altitude and temperature, which will all effect the way your wastegate does it’s job.
Mounting the wastegate. this is one of the most overlooked areas of boost control. In a perfect world you would select a mounting location for our wastegate that allows the gate equal access to all cylinders or rotors. This promotes equal exhaust port pressures between cylinders/rotors and avoids mysterious tuning problems resulting from uneven exhaust port back pressures. Another aspect to keep in mind is the high velocity of the exhaust gas inside the exhaust manifold, sometimes exceeding 800ft sec. Gas that is traveling at such high velocities will not easily make 90 degree turns of zero radius into the wastegate inlet. Remember Newton’s second law, “bodies in motion tend to stay on motion”. That particle of air is not particularly inclined to make a 90 degree turn and 800ft/sec. It must be persuaded to do so by giving it a gentle radius and easy access to the exhaust flow. Simply welding the gate to the side of a tube may work in some cases where the manifold back pressure is thru the roof, but in modern high efficiency turbochargers the pressure inside the manifold can be quite low and special through should go into wastegate runner geometry. The penalty for poor gate placement and poor gate runner design is having to use a larger gate.
thanks for all the info!!
I am assuming tapping the manifold for the external wastegate isn’t to difficult for someone who knows what they are doing? Or would it be better to see if I can sell my manifold i got and find one already with the port?
Originally posted by whitey
thanks for all the info!!I am assuming tapping the manifold for the external wastegate isn’t to difficult for someone who knows what they are doing? Or would it be better to see if I can sell my manifold i got and find one already with the port?
if it were me i would have someone else do it who has done it b4,for one it will come out cleaner looking and two,if it breaks or anything its not ur fault.
or u could do the set-up i am going to run with my new turbo is have a custom o2 housing made so that the wastegate bolts directly onto the housing instead of having to tap a manifold
Originally posted by brokeasskorean
if it were me i would have someone else do it who has done it b4,for one it will come out cleaner looking and two,if it breaks or anything its not ur fault.or u could do the set-up i am going to run with my new turbo is have a custom o2 housing made so that the wastegate bolts directly onto the housing instead of having to tap a manifold
wow isnt that kinda complicated? What turbo are you gonna be running? One of Huml’s?
Originally posted by brokeasskorean
if it were me i would have someone else do it who has done it b4,for one it will come out cleaner looking and two,if it breaks or anything its not ur fault.or u could do the set-up i am going to run with my new turbo is have a custom o2 housing made so that the wastegate bolts directly onto the housing instead of having to tap a manifold
jay tapped his on the 240… it hasnt cracked yet.