Monthly Archives: May 2016

Testing

Water Shock Results

Results from installing the Aquamist water shock (aka anti-surge accumulator) are shown below.  The charts are labeled with the boost pressure, psi, along the left vertical axis, and the water-methanol injection flow rate, mL/min, on the right vertical axis.

Water shock installed
Water shock installed

 

Prior to install – no accumulator inline:

WMI without accumulator
WMI without accumulator

After installing the accumulator:

wmi_plus_water_shock

The boost profile was different for each hardware configuration, and I also altered the TorqByte WMI pump duty cycle table, thus the flow rate is not expected to be the same for each of these cases.  What I was looking for was to see what effect the anti-surge accumulator produced.

I was hoping that it would serve to smooth out the injection flow rate, which it has done.  The oscillating flow rate in the first chart has become much more steady in the second chart.  It looks like figuring out how to permanently include the accumulator in the setup will be the next order of business.

Misc.

Charge Air Temperature Rise with Boost Increases

There are a few bits of interesting data that I’ve recorded while measuring boost pressure for fixed wastegate duty cycles.  This is part of my effort to fine tune the KFLDRL numbers for the new wastegates that the TTE550’s use.

Each fixed wastegate duty cycle produces a different boost level.  The range of boost levels that were recorded in third gear are shown below.  Note: The recording in third at 10% was not long enough to make including the results worthwhile.

Boost Level for Fixed WG DC (TTE550 turbochargers)
Boost Level for Fixed WG DC (TTE550 turbochargers)

 

The chart above shows fixed WGDC’s of: 0%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, and 85%.

For each of these boost levels I also recorded the air temperature going into the turbocharger compressor, along with the temperature after exiting the compressor.  The approximate rise in temperature caused by the compression of the air for each boost level is shown below.

Air Temperature Rise for Boost Levels
Air Temperature Rise (degF) for Boost Levels

Note: This is an approximate rise due to the location of the air temperature sensor being slightly downstream from the turbocharger compressor outlet.  The air temperature exiting the turbocharger is likely higher than what is recorded due to cooling taking place in the charge pipe prior to the air passing over the temperature sensor.

Upgrade Work

Aquamist Anti-Surge Accumulator

I decided to pull this component out of a parts box and install it on my water-methanol injection system to see if it will help with smoothing out the fluid flow to the intake.

Aquamist Anti-Surge Accumulator "Water Shock"
Aquamist Anti-Surge Accumulator “Water Shock”

The part is called an anti-surge accumulator.  Aquamist offered it with the 2D system that I used to operate.  It helped to smooth the fluid supply from the race pump and was also supposed to help improve the flow rate from the pump.  I’ve noticed some oscillations in the reported flow rate and thought this might help to smooth the supply.  The Aquamist race pump had much lower flow capacity than most of the currently available pumps, so I’m not concerned with any flow rate increases that might come from using this part.  In fact I generally run the pump I have around 30-45% duty cycle and it cools well at that flow rate into a pair of 0.7mm Aquamist nozzles.

I’ve installed the ‘water shock’ after the pump and prior to the water flow sensor.

Water shock installed
Water shock installed