Anyone have stock turbos holding boost to redline?
03-23-10, 02:06 AM
#26
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I'm thinking that in order to get 6 psi up top I have to suffer with 10 psi in the mid range, whereas I imagine an EBC would modulate the wastegate in a way that gives a more stable pressure (although still subject to other variables i know).
then again, idk?
03-23-10, 07:03 AM
#28
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Come on guys, give it up...
the stock turbo is meant to produce 0.5bar till redline. It does that just fine...
But when you increase boost, the turbo spins faster and the turbine and compressor are working beyond their limit, and therefore they dont hold boost till redline!
I tried a stronger actuator in the past, even put in a 14psi wastegate spring and set the avcr just right, but boost drops.
You can NOT prevent this as the wastegate is already closed all the way at redline, because the turbo just cant deliver...
The turbine is just too small to give power throughout the full range.
With a hybrid like bnr you can shift the powerband upwards, but it will always be a compromise...
the stock turbo is meant to produce 0.5bar till redline. It does that just fine...
But when you increase boost, the turbo spins faster and the turbine and compressor are working beyond their limit, and therefore they dont hold boost till redline!
I tried a stronger actuator in the past, even put in a 14psi wastegate spring and set the avcr just right, but boost drops.
You can NOT prevent this as the wastegate is already closed all the way at redline, because the turbo just cant deliver...
The turbine is just too small to give power throughout the full range.
With a hybrid like bnr you can shift the powerband upwards, but it will always be a compromise...
03-23-10, 02:18 PM
#29
If I take the mbc off it goes to wastegate spring boost (~5psi), but if I install the mbc and turn it up I get 10 psi. So I don't see how a mbc doesn't have anything to do with holding boost.
I'm thinking that in order to get 6 psi up top I have to suffer with 10 psi in the mid range, whereas I imagine an EBC would modulate the wastegate in a way that gives a more stable pressure (although still subject to other variables i know).
then again, idk?
I'm thinking that in order to get 6 psi up top I have to suffer with 10 psi in the mid range, whereas I imagine an EBC would modulate the wastegate in a way that gives a more stable pressure (although still subject to other variables i know).
then again, idk?
picture the rear turbo housing letting exhaust gasses flow through it normally. Now on a wide open throttle run, the stock wastegate door gets bombarded with back pressure due to the high exhaust pulse of a rotary, and the small size of the turbo. Forcing the door open...
the boost controller is doing its job still. But has nothing to do with the excess exhaust overpowering the stock wastegate spring. So, a great way to resolve this is a stronger wastgate. or even an upgraded external wastegate. but in the end, a wastegate is the answer.
a boost controller will do NOTHING to solve the problem, electronic or manual. The problem can always be solved. never think that you just "have to live with it" or "thats just the way it is". theres always a solution.
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