what size wastegate do I need?
Staging Lane
Joined: Sep 2008
Posts: 99
Likes: 0
From: MI
You can show me all the diagrams you want and for each one I can show you 10 builds where a 90* placement still effectively controls boost.
Not to mention, when the wastegate is open, 100% of flow isn't going through it anyways.
Not to mention, when the wastegate is open, 100% of flow isn't going through it anyways.
heres a pic of my merge, the flange is actually the pass side and the 45* runs infront of the motor to the drivers side. I was thinking I can run a pipe from the pass side at the 90* and one from the 45* on the drivers side into eachother making one single into the wastegate. then they will both be in direct flow.
Staging Lane
Joined: Sep 2008
Posts: 99
Likes: 0
From: MI
provide images of the car and dyno charts with boost logs on them controling single digit numbers.
Staging Lane
Joined: Sep 2008
Posts: 99
Likes: 0
From: MI
heres a pic of my merge, the flange is actually the pass side and the 45* runs infront of the motor to the drivers side. I was thinking I can run a pipe from the pass side at the 90* and one from the 45* on the drivers side into eachother making one single into the wastegate. then they will both be in direct flow.
i'll post some images of good and bad in a bit
that still has a 90 degree bend. something like this will be more efficient and will place the wastegate close enough to the downpipe to allow it to recirculate without causing too much restriction. you want the wastegate pipe as close to the merge as possible but the smoother the transition the better. but if space allows.
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My experience from 10+ builds is that 90 degree will work fine, if and only if, you have a properly sized wastegate.
If it were me, and I needed to run low boost and I only had the option to run a 90 degree, then I would opt for a bigger wastegate.
Staging Lane
Joined: Sep 2008
Posts: 99
Likes: 0
From: MI
The flaw in your model is the lack of restriction/back pressure. Sure, the flow will be exactly as shown by your image if this was an open header (i.e. open header dumping to atmosphere). With backpressure, the whole manifold/wastegate tube would be filled with exhaust, and try to exit any way that it can. I do agree that the tube in the flow direction is ideal though.
My experience from 10+ builds is that 90 degree will work fine, if and only if, you have a properly sized wastegate.
If it were me, and I needed to run low boost and I only had the option to run a 90 degree, then I would opt for a bigger wastegate.
My experience from 10+ builds is that 90 degree will work fine, if and only if, you have a properly sized wastegate.
If it were me, and I needed to run low boost and I only had the option to run a 90 degree, then I would opt for a bigger wastegate.
yes, if you have backpressure through the roof a 90* angle will work a bit better, but at that point the turbo is going to come onto boost later, have to work harder to make the power, fall off up top and generally not perform anywhere near as well as a properly set up turbo system.
i have pretty much a 90* coming out from my merge with a pte88, tial 48mm wastegate and the least amount of boost i can run is 11-12psi
if it was transitioned i'm sure i could get it lower, but that is low enough for me.
if it was transitioned i'm sure i could get it lower, but that is low enough for me.
Your image appears to show what a naturally aspirated engine would expel through an open header. What inputs did you use in order to run the flow analysis in the pic?
yes, if you have backpressure through the roof a 90* angle will work a bit better, but at that point the turbo is going to come onto boost later, have to work harder to make the power, fall off up top and generally not perform anywhere near as well as a properly set up turbo system.
As far as symptoms of an inefficient setup, I agree with what you listed.
I totally agree with you except when i was in college i had some ignorant and just plain dumb teachers that had no business in a classroom. This guy (tial) could be the receptionist. lol jk its a good discussion though and i m subscribed
It all depends on what your definition of "controlling boost" is and how low you want to be able to turn the boost down. Do any of those 10 effectively controlled boost setups have a spike in the boost at peak boost?