TiAL

negative
you get about 10% of the total flow to the wastegate at a 90* angle

HydroStream6

iTrader: (16)

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.

70c10

iTrader: (1)

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.

TiAL

show me

provide images of the car and dyno charts with boost logs on them controling single digit numbers.

TiAL

in direct flow and you're good
i'll post some images of good and bad in a bit

70c10

iTrader: (1)

thanks tial Im going to try and draw what I want to do

70c10

iTrader: (1)

here is what I was thinking

98TA6.0

iTrader: (42)

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.

RealQuick

iTrader: (14)

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.

TiAL

that should work, just transition the right side in so it isn't a 90.

here are some great examples:

TiAL

this is not

TiAL

1:1 backpressure isn't a flaw...having a cheap inefficient turbo with an A/R that is sized incorrectly, primaries that are too small for the hp goal resulting in wayy too much back pressure is a flaw in my book.

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.

smokinHawk

iTrader: (48)

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.

RealQuick

iTrader: (14)

I agree that 1:1 isn't a flaw... but that ratio you speak of is the ratio of boost on the intake side versus exhaust backpressure... that is different than what I am talking about (and different then your image appears to be showing).

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?


What do you consider through the roof? According to you, a 1:1 is ideal right? Let's say you run 20psi on the intake, then the exhaust will see 20psi in the exhaust manifold (at your 1:1). 20psi of pressure in an exhaust manifold won't show flow like the picture you showed. If boost is a measurement of restriction, that whole manifold and wastegate tube should be pressurized and ready to bleed off boost (whether a 90 degree is used or not)?

As far as symptoms of an inefficient setup, I agree with what you listed.

nmcgrawj

Subbing. Can't get the thread tools drop down to work on my phone to avoid a useless post...

Spoolinsteve

you guys are really arguing with someone, who I ASSume, is some sort of person works for basically the most well known wastegate companies?

massconfusion

iTrader: (18)

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

massconfusion

iTrader: (18)

junkyard setups at their finest lol! great pic

robbyredneck

iTrader: (1)

this is one of the funniest damn things i have ever seen

Phil99vette

iTrader: (11)

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?