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2,952 Posts
First off, before the results here are my current power mods.........
Stage 1, BDJs Racing cat less side exit exhaust, IceMan CAI, IceMan 60mm TB, AGP WGA, Greddy Profec B Spec 2 BC, CoolingMist.com's dual stage water injection system
The dyno was done at DynoWorks in San Bernardino California at noon today. The temps were around 85 degrees. All runs were done on 91 octane crappy pump California gas. The WGA and BC were tuned in to run 17 psi dropping to 15 psi at redline. Also note that right now, the water injection system is spraying a bit too much water as my car is stumbling at initial WOT. The small stage(approximately 1.2 gph nozzle) is currently activated at 7 psi of boost. The second stage(approximately 3.2 gph nozzle) is currently triggered at 14 psi of boost. The entire system is currently running on 75 psi of water pressure. Both nozzles are bolted in to my ATP UPP just prior to the IAT sensor.
Peak hp and tq with water injection fully activated;
254.2 hp @ 5300 rpm
260.6 ft lbs @ 4700 rpm
Peak hp and tq with only 1 of 2 stages of water injection activated;
254.3 hp @ 5400 rpm
263.8 ft lbs @ 4600 rpm
Peak hp and tq with water injection turned off;
249.7 hp @ 4950 rpm
265.9 ft lbs @ 4900 rpm
From these peak numbers, you'd think that water injection doesn't do a whole lot. But at the end of the power band is where BIG differances are!
At redline(6200 rpm) here are the power differances in hp and tq.
both stages of water injection activated;
240 hp
208 ft lbs
one stage of water injection activated;
235 hp
205 ft lbs
water injection turned off;
225 hp
190 ft lbs
So when you look at it like this, when I had water injection running, the car pulled really good all the way to redline. It never fell on it's face like the car had done in the past as is evident in the run when the water injection was turned off. In warmer temps, the power gains will be higher. Once I get the system tuned in, power gains will be higher. If I can ever get an Apexi S-AFC, my power gains will be higher as well.
Air/fuel ratio was ran and suprisingly, it was VERY consistant between all runs. Air/fuel dipped to 10.0:1 at 3500 rpms. At 4500 rpm, it started to lean out just a bit. By 5400 rpm, air/fuel was steady at 12.0:1 all the way to redline. I currently have NO fuel mods besides Stage 1.
All in all, once I get it tuned in and running my normal boost again(18-19 psi dropping to 16 at redline) and once I get my intercooler sprayer working again(it blew a hose) then power levels will be back up to where I expect them to be. I'm VERY happy with it!
This post is not intended to brag about the overall power numbers. Yes they are a bit low. I'm not concered about that. I'm more concered about the effectiveness of an untuned water injection system on our cars. To me, it seems as though it is WELL worth the money.
**** On all of the single stage water injection runs, I had the small nozzle running. ****
edit: ohh yeah, I've got the dyno sheet so if someone in the South Cali area would like to scan it in for me, then it could be posted. thanx!
Stage 1, BDJs Racing cat less side exit exhaust, IceMan CAI, IceMan 60mm TB, AGP WGA, Greddy Profec B Spec 2 BC, CoolingMist.com's dual stage water injection system
The dyno was done at DynoWorks in San Bernardino California at noon today. The temps were around 85 degrees. All runs were done on 91 octane crappy pump California gas. The WGA and BC were tuned in to run 17 psi dropping to 15 psi at redline. Also note that right now, the water injection system is spraying a bit too much water as my car is stumbling at initial WOT. The small stage(approximately 1.2 gph nozzle) is currently activated at 7 psi of boost. The second stage(approximately 3.2 gph nozzle) is currently triggered at 14 psi of boost. The entire system is currently running on 75 psi of water pressure. Both nozzles are bolted in to my ATP UPP just prior to the IAT sensor.
Peak hp and tq with water injection fully activated;
254.2 hp @ 5300 rpm
260.6 ft lbs @ 4700 rpm
Peak hp and tq with only 1 of 2 stages of water injection activated;
254.3 hp @ 5400 rpm
263.8 ft lbs @ 4600 rpm
Peak hp and tq with water injection turned off;
249.7 hp @ 4950 rpm
265.9 ft lbs @ 4900 rpm
From these peak numbers, you'd think that water injection doesn't do a whole lot. But at the end of the power band is where BIG differances are!
At redline(6200 rpm) here are the power differances in hp and tq.
both stages of water injection activated;
240 hp
208 ft lbs
one stage of water injection activated;
235 hp
205 ft lbs
water injection turned off;
225 hp
190 ft lbs
So when you look at it like this, when I had water injection running, the car pulled really good all the way to redline. It never fell on it's face like the car had done in the past as is evident in the run when the water injection was turned off. In warmer temps, the power gains will be higher. Once I get the system tuned in, power gains will be higher. If I can ever get an Apexi S-AFC, my power gains will be higher as well.
Air/fuel ratio was ran and suprisingly, it was VERY consistant between all runs. Air/fuel dipped to 10.0:1 at 3500 rpms. At 4500 rpm, it started to lean out just a bit. By 5400 rpm, air/fuel was steady at 12.0:1 all the way to redline. I currently have NO fuel mods besides Stage 1.
All in all, once I get it tuned in and running my normal boost again(18-19 psi dropping to 16 at redline) and once I get my intercooler sprayer working again(it blew a hose) then power levels will be back up to where I expect them to be. I'm VERY happy with it!
This post is not intended to brag about the overall power numbers. Yes they are a bit low. I'm not concered about that. I'm more concered about the effectiveness of an untuned water injection system on our cars. To me, it seems as though it is WELL worth the money.
**** On all of the single stage water injection runs, I had the small nozzle running. ****
edit: ohh yeah, I've got the dyno sheet so if someone in the South Cali area would like to scan it in for me, then it could be posted. thanx!