Tuning for turbo water injection ??
Tuning for turbo water injection ?? Hey guys quick question, i have a turbo 5.3 running at 10 lbs of boost. I just got a cooling mist methanol kit and was wondering if i needed to retune to use it if i was only running water. I have read many threads saying a retune would be needed for washer fluid ( is that true?), but nothing about straight water. Im just using it for lower iat's and insurance against heat / detonation, not a bump in octane or whatever methanol does. Thanks guys have a great weekend
9 Second Club
Joined: Nov 2003
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From: Norn Iron
That depends entirely how much you're spraying, when you're spraying and whether you're making any other changes...just doing it for safety, or trying to improve performance.
But spraying water alone whilst yes it will add safety....will often also lose power if you make no other changes.
And when using water only, you will be using very small amounts compared to methanol so the application of the water is important.
But spraying water alone whilst yes it will add safety....will often also lose power if you make no other changes.
And when using water only, you will be using very small amounts compared to methanol so the application of the water is important.
That depends entirely how much you're spraying, when you're spraying and whether you're making any other changes...just doing it for safety, or trying to improve performance.
But spraying water alone whilst yes it will add safety....will often also lose power if you make no other changes.
And when using water only, you will be using very small amounts compared to methanol so the application of the water is important.
But spraying water alone whilst yes it will add safety....will often also lose power if you make no other changes.
And when using water only, you will be using very small amounts compared to methanol so the application of the water is important.
the advantage of water injection is the drop in EGT (combustion temp -> EGT) for safety when using pump (poor) fuel. Imagine you had a dial with a "max egt setting" on it. Depending where you install the probe, you will desire some max egt M. Lets say M is 1200*F and the probe is installed in the downpipe. Watch the EGT and control it by adding water until it stays reasonable.
TECH Apprentice
Joined: Nov 2016
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From: switzerland
water injection starts showing positive effects when you reach 20% of fuel (by volume). you can then advance timing on a detonation limited engine or increase boost. up to 1:1 water fuel ratios have been used. less then that it will just cool the charge a little. you will need around 0.02g/min/bhp/°k of water. its not uncommon to loose power.
Last edited by Dian; Jun 20, 2017 at 07:11 AM.
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9 Second Club
Joined: Nov 2003
Posts: 13,616
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From: Norn Iron
water injection starts showing positive effects when you reach 20% of fuel (by volume). you can then advance timing on a detonation limited engine or increase boost. up to 1:1 water fuel ratios have been used. less then that it will just cool the charge a little. you will need around 0.02g/min/bhp/°k of water. its not uncommon to loose power.
good luck with that!
I believe some of the water injection research was also for cruise economy, I think those 50% (1:1) water injection was for a lean cruise situation. I can't be 100% sure its been a while, but what I took away from that paper was there is an economy benefit to reducing fueling and injecting water in place of it since water plays a role in combustion.
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Joined: Mar 2014
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From: Ohio
The 1:1 water/fuel ratio was on the turbine engines, not the piston engines. Water would be sprayed just after the compressor blades on the turbine, and the rapidly expanding water -> steam reaction would cause much more gas to discharge than was being brought in, causing a large bump in thrust.
9 Second Club
Joined: Nov 2003
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From: Norn Iron
And that's where methanol appeared.
TECH Apprentice
Joined: Nov 2016
Posts: 371
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From: switzerland
it was on both. currently bmw is finding it can run its engines at 1 lambda at wot with a 35% by weight mixture. its actually more or less the percentage of fuel that would be used to richen it up (fi).
