Abandoned build
#62
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...probably would help if my battery was hooked up. I also submitted my application for R-tard of the year award, they said they couldn't accept it because I bring down the name of R-tards everywhere.
#69
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While most turbochargers can accommodate a wastegate signal directly at the compressor, this is the worst possible location to take it from.
For more information, read: https://www.miataturbo.net/diy-turbo...eed-ebc-47532/
EDIT: didn't mean to **** on your first post after 2 years lurking. Welcome.
#70
"Allowing a diaphragm-type wastegate to see boost and vacuum in quick succession or vacuum at all will wreak havoc on the diaphragm. The diaphragm is not designed to see vacuum or cycle between vacuum and boost. I'm not sure how much this shortens the life of the diaphragm, but the wear is significant."
It may be rubbish.. but it was something that I once read and clearly took it as truth. It sounds like you've had experience to the contrary?
but for optimal performance, the signal MUST be taken from a point after the intercooler. Pressure drop across the intercooler increases as a function of mass flow, and you want to account for that in the boost control. Far from being "unreliable," a post-intercooler source is far more stable (with regard to MAP) than a pre-intercooler source.
While most turbochargers can accommodate a wastegate signal directly at the compressor, this is the worst possible location to take it from.
EDIT: didn't mean to **** on your first post after 2 years lurking. Welcome.
While most turbochargers can accommodate a wastegate signal directly at the compressor, this is the worst possible location to take it from.
EDIT: didn't mean to **** on your first post after 2 years lurking. Welcome.
I may need to reconsider my own set up then.. Many kits off the shelf have you reference from the compressor housing.. I feel like it wouldn't be difficult to have a boost source tapped into the cold side cooler piping, so why don't manufacturers do this? (Begi's AO kit, for instance, ships with a hose barb for the comp housing).
#71
Boost Pope
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I've seen it in a few places, including stickies in other forums such as The basics of boost control, wastegates and how to turn up the boost.
"Allowing a diaphragm-type wastegate to see boost and vacuum in quick succession or vacuum at all will wreak havoc on the diaphragm. The diaphragm is not designed to see vacuum or cycle between vacuum and boost. I'm not sure how much this shortens the life of the diaphragm, but the wear is significant."
It may be rubbish.. but it was something that I once read and clearly took it as truth. It sounds like you've had experience to the contrary?
"Allowing a diaphragm-type wastegate to see boost and vacuum in quick succession or vacuum at all will wreak havoc on the diaphragm. The diaphragm is not designed to see vacuum or cycle between vacuum and boost. I'm not sure how much this shortens the life of the diaphragm, but the wear is significant."
It may be rubbish.. but it was something that I once read and clearly took it as truth. It sounds like you've had experience to the contrary?
I actually agree with you that the wastegate signal should not be taken post-throttle, but for an entirely unrelated reason: this setup disassociates the effective maximum boost setpoint (pre-TB) from the actual manifold pressure (post-TB) and does nothing but generate surplus heat and waste energy when you're operating the engine at part-throttle under sustained heavy load (eg: driving up a hill in steady cruise.)
I may need to reconsider my own set up then.. Many kits off the shelf have you reference from the compressor housing.. I feel like it wouldn't be difficult to have a boost source tapped into the cold side cooler piping, so why don't manufacturers do this? (Begi's AO kit, for instance, ships with a hose barb for the comp housing).
#73
A T3/T4 is fine, I ran it on a BP with 10.0@1 pistons. Good for cruisin and a beast at 15 psi on a .63 outlet.
Yes, the aluminum pulley, throw it away, get the best harmonic balancer possible. When I did my swap I forgot I had a aluminum pulley from my NA build.
Blew up oil pump within 2 months, lost complete engine, metal gears got into the engine, crank, oil pan, a disaster.
I dont have the car anymore, but I recommend high compression with a T3/T4, forged rods, and a good tune, MS, etc.
Yes, the aluminum pulley, throw it away, get the best harmonic balancer possible. When I did my swap I forgot I had a aluminum pulley from my NA build.
Blew up oil pump within 2 months, lost complete engine, metal gears got into the engine, crank, oil pan, a disaster.
I dont have the car anymore, but I recommend high compression with a T3/T4, forged rods, and a good tune, MS, etc.
#77
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So on my first logging run I hit 137 kpa@6800, which is pretty much 20 psi so I went in and set my boost limit to 111 kpa(about 6500 rpm) to keep from burning my motor before I dyno it. Needless to say, it works, just don't know how well for how long.
Last edited by Pretending2koolz; 04-30-2016 at 09:11 PM. Reason: incorrect unit