In Soviet Russia car build YOU!
#1852
Elite Member
Thread Starter
iTrader: (10)
Join Date: Jan 2010
Location: VA
Posts: 3,493
Total Cats: 268
its really baller, i'll post pics later
Worked on the Miata last night. Alternator all hooked up, works great.
HOWEVER
Megasquirt is still showing 16V+. In fact, voltage displayed in TunerStudio has no correlation to voltage displayed by volt meter. TunerStudio shows higher voltage than battery.
What the actual ****? The old alternator was probably fine, after all.
Worked on the Miata last night. Alternator all hooked up, works great.
HOWEVER
Megasquirt is still showing 16V+. In fact, voltage displayed in TunerStudio has no correlation to voltage displayed by volt meter. TunerStudio shows higher voltage than battery.
What the actual ****? The old alternator was probably fine, after all.
#1854
Elite Member
Thread Starter
iTrader: (10)
Join Date: Jan 2010
Location: VA
Posts: 3,493
Total Cats: 268
yes, everything runs shitty with wrong voltage
The voltage is also not wrong by a fixed offset but starts creeping when the car is running. e.g. it would start at 14v and climbs to 16v in a few seconds.
The voltage is also not wrong by a fixed offset but starts creeping when the car is running. e.g. it would start at 14v and climbs to 16v in a few seconds.
#1855
Elite Member
Thread Starter
iTrader: (10)
Join Date: Jan 2010
Location: VA
Posts: 3,493
Total Cats: 268
Well I fixed the issue. It turned out to be.... the fuel pressure sensor. Its a 5V sensor and when its plugged in, MS doesn't get full 5V and acts all kinds of stupid!
The insane part is that the fuel pressure sensor was what I used to diagnose the 'dead' fuel pump - well, it might have been fine all along and just the sensor was reading completely wrong value.
I'm pissed but happy that I can drive the miata tomorrow. Its not tuned anymore since now I have no idea what the fuel pressure is set to.
The insane part is that the fuel pressure sensor was what I used to diagnose the 'dead' fuel pump - well, it might have been fine all along and just the sensor was reading completely wrong value.
I'm pissed but happy that I can drive the miata tomorrow. Its not tuned anymore since now I have no idea what the fuel pressure is set to.
#1858
Elite Member
Thread Starter
iTrader: (10)
Join Date: Jan 2010
Location: VA
Posts: 3,493
Total Cats: 268
Its an ebay 100psi sensor
Pressure Transducer or Sender 100 PSI Stainless Steel for Oil Fuel Air Water | eBay
I will try to figure out WHY its causing this.
In the meantime, drove the car and it felt good
Pressure Transducer or Sender 100 PSI Stainless Steel for Oil Fuel Air Water | eBay
I will try to figure out WHY its causing this.
In the meantime, drove the car and it felt good