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Old 13-11-2003, 07:23 PM
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Default AFRs after injecting water.

I am curious to hear back from users what AFRs they are seeing after they have tuned their cars for water injection?

See the related thread on calibration but also curious what if any calibration was done on the lambda sensor with an exhaust gas analyzer or otherwise.
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  #2  
Old 03-03-2004, 02:23 AM
spool spool is offline
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I have Derek devices.com kit.

I've tuned to 11.5 AFR and it pulls very hard on my '98 Supra TT BPU car.

It's a great system.
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Old 06-05-2005, 04:43 PM
honki24 honki24 is offline
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a friend on EVOM said he leaned out to 11.4 on his EVO, AND added timing, as well as bumped up to about 22 psi.
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Old 04-06-2005, 11:24 PM
tici tici is offline
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With water alone it doesn't change (WB).
With water and alcohol (ethanol in my case) I saw lower AFR's - alcohol burns oxyges same as fuel.
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Old 16-07-2005, 01:49 PM
themadscientist themadscientist is offline
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I just tuned my first WI WRX.
Tuned AFR is 12.5-12.8:1 I was able to add 4 points of timing, and the TD04 is blowing 20psi in the mid range tapering to ~16psi at redline without det. Next week I should have it on a dyno to try and lean it out even further and see if it makes more power.

TMS
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Old 17-07-2005, 01:40 AM
tici tici is offline
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I bet it won't : 12.5 - 12.8 is pretty good!
OK, I'm talking V8 engines, but I can't imagine that different engines are different about AFR.
I also tuned it with water alone exactly in the same range as yours, then switched to 50% ethanol (same quantity) and had the feeling the car was running better.
On the dyno I changed timing (from 17 to 23*) and AFR (up to 13.:1) but I saw no power difference, I guess there is an optimum.
Please let us know about the result, Im curious!
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  #7  
Old 28-07-2005, 11:30 PM
unior unior is offline
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peak torque occurs at 13.2:1

best for turbo car is 12.5:1

according to RB racing that is
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Old 09-12-2005, 08:18 AM
RICE RACING RICE RACING is offline
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We dynoed a Toyota supra with auto gearbox and it made following

470rwkw on 11.0:1 AFR 12 deg timing 34psi boost
470rwkw on 12.5:1 AFR 12 deg timing 34psi boost
471rwkw on 12.5:1 AFR 18 deg timing 34psi boost

We have dynoed FSAE engines and made no difference in power or torque from 10.8:1 AFR to 13.9:1 and all ratios between. Some of the gains are over stated for pure power differences, all I have experienced over the years points to this especialy if you have a racing derived ignition system that is capable of firing the air/fuel mix regardless of mixture.

What you gain in BSFC you loose in total energy mass thrown into the engine (less fuel = less power) but its net effect is quelled by increased BSFC). If your ignition system is marginal then you can make big gains with running leaner more acceptable mixtures.

If fuel efficiency is not an issue (def not for street or sprint race circuit car) as time spent on WOT and high revs is very small percentage of duty esp on street than I simply set up cars with maximum fuel cooling rate even with WI as durability is enhanced, any marginal gains in power "and they are very marginal" running leaner mixtures are not worth the hassel unless your fuel system capacity is stretch (not enough injector) or as stated before you need "racing fuel efficiency gains for longer time on track to increase pit window etc.

I generaly use 10.8:1 to 11.8:1 in all applictions running pump 98 octane and up to 36psi boost pressure on 8.5 to 9.0 compression.
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Old 09-12-2005, 09:02 PM
JohnA JohnA is offline
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Quote:
Originally Posted by RICE RACING
We dynoed a Toyota supra with auto gearbox and it made following

470rwkw on 11.0:1 AFR 12 deg timing 34psi boost
470rwkw on 12.5:1 AFR 12 deg timing 34psi boost
471rwkw on 12.5:1 AFR 18 deg timing 34psi boost

We have dynoed FSAE engines and made no difference in power or torque from 10.8:1 AFR to 13.9:1 and all ratios between....
My auto supra registered 5-7% more power just by trimming off fuel from the stock 10.5-11:1 up to 12.5:1
That was at holding 18psi on stock turbos.
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  #10  
Old 31-01-2006, 11:30 PM
Richard L Richard L is offline
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I am curious about the product coming out of the exhaust pipe afe 10.8:1. Unless the content contains only "water", "carbon dioxide" and ""gasoline" and 0% "carbon monoxide" , I can then accept that there are no charge in power output.

As long as Carbon monoxide exists, there should be some loss in power since some oxygen is being taken away by carnon monoxide, yields only 30% power of Carbon Dioxide.

Richard
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