Damon, here is some TD04 info from a thread I was considering increasing the flapper size (which very well could be a bad idea)... if you could plug in the math I would be interested to hear what you come up with. You might also want to consider that the Turbine pressure will likely be substantially higher than what FWombat noted with his TD05s.
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Originally Posted by RobBeck
Stock TD04 Flapper is 27mm. Stock Wastegate hole is 20mm. If you want to retain the stock flapper you can port the hole to 22-23mm safely.
It appears you could also get a 34mm flapper from TRE ( http://www.teamrip.com/accessories.html). Not sure what it is made of but hopefully it is a high grade steel.
http://www.teamrip.com/images/34mmWGV.jpg
Machine this from 34mm down to 31mm Max.
Then port/blend actuator hole to about 26-27mm (essentially the size of the stock flapper, so you could use the stock flappers contact mark as a guide). So doing this housing mod could get you from about 20mm to about 27mm MAX with the new flapper... or get you about 4mm more if you just port what you have and keep the stock flapper. I have never tested the flapper swap but doing it has crossed my mind.
Rob |
Basically, stock flapper hole is 20mm and can be ported up to 22-23mm with stock flapper. Let me know what you come up with.
Rob
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Originally Posted by twiceblown
Anyone have the sizes of the flapper and diameter of diaphragm of the TD04 stuff? I'm curious for what i need. I know 9# springs are much better than stock 6#ers, but i'd dying to know what would be ideal.
Damon
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