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My compound turbo set-up

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I believe AMS said that it didn't work that well. The first configuration in this thread pictured several times is proven to work better. And it has an internal gate for the small turbo.

Also research Ray Peters twin charged setup. The turbo feeds a supercharger. The supercharger was not bypassed after spool, only before to keep the heat down during light cruise (superchargers are not load dependent). It did very well. The 18g turbo fed into the m62 (tiny supercharger) and it made 450whp at 22psi with the td05h 7cm^2 turbine. He saw full boost before 2000rpms with a 2.0L motor.
 
I know the car in this thread has a bigger turbo and then a smaller one, but wonder how well it'd word to have 2 of the same exact turbo's. Like two 20g's or something. Hmmm...
 
94awdcoupe said:
This is incorrect. here are some pictures to clear it up for you. as I said earlier wastegates do not work to control back pressure. These are pictures of how a 11psi actuator works. I hope we can all agree that external wastegates function the same as internal actuator. 10 psi yields closed wastegate. 11psi wastegate starts to open. but barely. at 14psi it is clearly open but still not by much. it takes a full 20psi before its fully open.

This is because wastegates have a spring in them. as the spring is compressed with boost it takes more boost to open it farther and farther.

so your statemnet that the wastegate will be wide open at boost is not correct. it only goes wide open during momentary over boost.

Lets say you have a 15psi gate. at 14psi the gate will not be open. at 15psi it will be barely open. just enough really to bleed enough exhaust to control the boost at 15psi. the wastegate isnt fully open for max flow till you see 25psi at the cannister. problem is you are trying to run 15psi boost. so it will never be open that far except for momentary boost spikes.

mow what happens when you run 30psi on a 15psi spring? same thing really at 29psi the wastegate will not be open. doesnt open till 30psi. and it wont be fully open till the boost is at 45psi since the wastegate is now being "fooled" by bleeding pressure off.
Click to expand...
Remeber that there is exhaust pushing against the gate.

My dad thought the same thing saying my internal wastgate was defective. It took 20 psi to open it with an air compressor. When on the car it took only 13psi to open fully because of the exhaust blowing against it.
 
Almost!

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What do you guys think of the new front end?
(bolts not tightened in this first pic)

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That looks a million times better than the Blitz kit, IMHO. Sorry if you were partial to the Blitz, but that is a look that has never really done anything for me. Glad to see the mechanical side of things are coming along well too.
 
That thing leaves me speechless, seriously. I hope everything goes smooth and it fires up tomorrow :)
 
I have yet to post in this because thers already alot of clutter but are you worried about torque causing clearance issues with the radiator? It looks like a mighty tight squeeze between there :p

Im sure you have solid motor mounts etc but I wouldnt be surprised if shit starts breaking really fast. Its not a matter of IF but WHEN ;)
 
Sweet, can't wait to see a vid of you firing it up.













What sucks for me is I can't seem to get my pos 16g setup tuned so I would never have any hope of tuning something like that ROFL. *curses own car*
 
Engine setup looks great. And visually the car looks great. Its different but looks good. Love the spoiler.
 
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