Water injection testing
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Honda-Tech Member
Joined: Sep 2003
Posts: 89
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Water injection testing
Hi guys, i have installed water injection stage 1 kit from alcoholinjectionsystems.com.
I am using 1 of the small nozzles that came with the kit, set to activate at 6psi i was getting bogging at the standard 150psi pump pressure. I have reduced the pump pressure to approx 70psi now and the car drives great awaiting dyno time.
Monitoring the IAT with s300 today, raining and approx 15 degrees C, back to back runs averaged around 105 degrees F SWITCHED OFF.
Switched on, same conditions, this dropped to steady 80 degrees F.
Average 20 degree F drop on a cool rainy day.
Questions:
Does this sound like a reasonable IAT drop?
Is there a formula for calculating approx power gain / IAT drop ?
What sort of IAT do you guys experience and in what weather conditions??
Thanks
I am using 1 of the small nozzles that came with the kit, set to activate at 6psi i was getting bogging at the standard 150psi pump pressure. I have reduced the pump pressure to approx 70psi now and the car drives great awaiting dyno time.
Monitoring the IAT with s300 today, raining and approx 15 degrees C, back to back runs averaged around 105 degrees F SWITCHED OFF.
Switched on, same conditions, this dropped to steady 80 degrees F.
Average 20 degree F drop on a cool rainy day.
Questions:
Does this sound like a reasonable IAT drop?
Is there a formula for calculating approx power gain / IAT drop ?
What sort of IAT do you guys experience and in what weather conditions??
Thanks
Honda-Tech Member
Joined: Jul 2001
Posts: 3,611
Likes: 3
From: Boston, MA, USA
Re: Water injection testing (JordanCivic)
The IAT is irrelevant. The real benefit of water injection occurs inside the combustion chamber during and immediately after the combustion process. The reduced IAT is most likely a result of water landing on, then evaporating off of the IAT sensor. You are going to need to tune the fuel and ignition to work properly with the water injection, else it will bog as you've discovered.
Trial User
Joined: Sep 2007
Posts: 2
Likes: 0
From: columbus, oh, USa
Re: Water injection testing (JordanCivic)
Jordan Civic,
If the nozzle you have is too large for your application give me a call directly at 1.801.447.2559 Ext 204. I would gladly send you out a smaller nozzle for you to try that way you can turn the pump pressure back up to the 150 psi. By switching over to a smaller injector and higher pressure you will get better atomization then running the nozzle and lower pressure you have now.
It also sounds as if your running pure water. What type of mixture are you running? If you are running pure water try running a 50/50 water methanol mixture. You will see a greater drop in air intake charge temperature. For the greatest drop in IAT we use pure methanol. However, when doing so tuning almost becomes mandatory.
Speaking of IAT. Where exactly is your sensor located in relation to the nozzle? How much distance is between the two?
Also, when you noted your intake temperatures of 105 degree's F and 80 degree's F you mentioned it was raining? What was the temperature of the day and how much boost were you peaking at? I'm assuming this is an air-to-air intercooled turbocharged system. Your AIT are already very low in comparison to what our other customers AIT are. We generally work with AIT's between 150-230+ degree's before adding the alcohol injection system. With air temps this high it very easy to pull out over a 70-120+ degree's. Your obviously not going to get the same drop since your air temps are lower then most.
As I mentioned feel free to give us a call directly and we will send you out a smaller injector for free. Also, try a water/methanol mixture if you haven't already.
Regards,
AIS
Rodney
If the nozzle you have is too large for your application give me a call directly at 1.801.447.2559 Ext 204. I would gladly send you out a smaller nozzle for you to try that way you can turn the pump pressure back up to the 150 psi. By switching over to a smaller injector and higher pressure you will get better atomization then running the nozzle and lower pressure you have now.
It also sounds as if your running pure water. What type of mixture are you running? If you are running pure water try running a 50/50 water methanol mixture. You will see a greater drop in air intake charge temperature. For the greatest drop in IAT we use pure methanol. However, when doing so tuning almost becomes mandatory.
Speaking of IAT. Where exactly is your sensor located in relation to the nozzle? How much distance is between the two?
Also, when you noted your intake temperatures of 105 degree's F and 80 degree's F you mentioned it was raining? What was the temperature of the day and how much boost were you peaking at? I'm assuming this is an air-to-air intercooled turbocharged system. Your AIT are already very low in comparison to what our other customers AIT are. We generally work with AIT's between 150-230+ degree's before adding the alcohol injection system. With air temps this high it very easy to pull out over a 70-120+ degree's. Your obviously not going to get the same drop since your air temps are lower then most.
As I mentioned feel free to give us a call directly and we will send you out a smaller injector for free. Also, try a water/methanol mixture if you haven't already.
Regards,
AIS
Rodney
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