Thinking of water injection..any recommendations?

dudemaaan · 02-18-2010, 12:43 PM

In my experience the tune doesn't change or need any changes when adding water (mine is preturbo). My AFR's didn't change at all when adding the water, my air temps didn't really change much either. They did seem to stay more constant on long pulls, and even when I increased the boost an extra 8 psi the air temps stayed the same. I never dynoed before and after the water or anything, but to me it felt a little stronger. I don't think it's a large increase in power if you keep the same boost levels, but when you safely add another 8-10 or more psi you definitely feel the power increase.

If IAT's were to drop then the ecu will compensate for the extra air by using the air corrections table.

Another thing to consider is the knock killing effects of water would allow you to run the car leaner and still be safe. So even if the tune changed by adding water the water would protect it. (although.. again, in my experience the tune doesn't change)

Peter (rice) how much boost are you running on the 50/50 mix with what turbo?

RICE RACING · 02-18-2010, 04:59 PM

I have run up to 21psi, all tested with the best performance analysis gear on earth (Race Logic VBOX3i) and (no retune), but hey I am "sketchy"

I have customer in NZ with 8 sec drag car who runs 36psi same system set up and water meth (no retune)

Numerous cars in Australia, running straight methanol with water/meth in front of the turbo (no retune) all make more power, run faster, and last much much longer

When I get a chance I will try to scan this article that ran this exact same system (following all parameters I stated) that showed "massive gains" in on road performance V's no performance gain for post turbo. This has not changed since the last 100 years, everyone who has tried it who is qualified in mechanical engineering all agree and come to the same conclusions

all others (not so smart or dare I say qualified to comment) call it a band aid

02-18-2010, 12:43 PM	#1
dudemaaan Rotary Fanatic Join Date: Mar 2008 Location: Brenham, TX Posts: 335 Rep Power: 18	In my experience the tune doesn't change or need any changes when adding water (mine is preturbo). My AFR's didn't change at all when adding the water, my air temps didn't really change much either. They did seem to stay more constant on long pulls, and even when I increased the boost an extra 8 psi the air temps stayed the same. I never dynoed before and after the water or anything, but to me it felt a little stronger. I don't think it's a large increase in power if you keep the same boost levels, but when you safely add another 8-10 or more psi you definitely feel the power increase. If IAT's were to drop then the ecu will compensate for the extra air by using the air corrections table. Another thing to consider is the knock killing effects of water would allow you to run the car leaner and still be safe. So even if the tune changed by adding water the water would protect it. (although.. again, in my experience the tune doesn't change) Peter (rice) how much boost are you running on the 50/50 mix with what turbo? __________________ 500+ HP thanks to: Fast reacting IAT sensor thread! Mechanical Pre-turbo Water Injection Thread Dual Stock fuel pumps Thread T2 differential swap!

02-18-2010, 04:59 PM	#2
RICE RACING Don Mega Join Date: Dec 2008 Location: Utopia Posts: 1,688 Rep Power: 19	I have run up to 21psi, all tested with the best performance analysis gear on earth (Race Logic VBOX3i) and (no retune), but hey I am "sketchy" I have customer in NZ with 8 sec drag car who runs 36psi same system set up and water meth (no retune) Numerous cars in Australia, running straight methanol with water/meth in front of the turbo (no retune) all make more power, run faster, and last much much longer When I get a chance I will try to scan this article that ran this exact same system (following all parameters I stated) that showed "massive gains" in on road performance V's no performance gain for post turbo. This has not changed since the last 100 years, everyone who has tried it who is qualified in mechanical engineering all agree and come to the same conclusions all others (not so smart or dare I say qualified to comment) call it a band aid __________________ www.riceracing.com.au Worlds best Apex Seals Coil on Plug Water Injection ECU Calibration Last edited by RICE RACING; 02-18-2010 at 05:36 PM.