#81
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Hotrod has posted this link on another forum, it is extremely good reading... recommended
http://enginehistory.org/Frank%20WalkerWeb1.pdf Richard
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Richard L aquamist technical support |
#82
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Good reading
I guess some of Frank's last inventions (end pages) might be of less interest to this forum: A non-slip stacked paper fasteners A urinary tract catheter that allows flushing and treatment of the prostate gland. :lol: |
#83
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I was very surprised about the isopropyl being useless. :shock:
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Richard L aquamist technical support |
#84
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This may not be the case with our setups (injection, ECUs, widebands, etc) :wink: |
#85
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I had been reading thru this topic few times now trying to get a grip. I have some thoughts to share.
First, talking about tuning new car for WI. It has been mentioned that you want AFR about 12.5 as cars under boost run normally richer. Well here is a third gear pull of my car. It?s totally stock: AUDI 2002 model 1.8 Turbo Max boost hit early about 7PSI@2000RPM. After 4500RPM there is boost reduction due to turbocharger going outside efficiency range at the same time AFR seem to be becoming richer. This does not correspond with max torque band as it is 2500-3500RPM. Look like new cars run lean stock. My cruising AFR is 14.7@ light load(80Km/h) Second, according to stock ECU knock sensor reaction KNOCK been detected throughout whole RPM range. Under knock I mean not audible knocking but early knock detection by ECU(mild knock). Here is Correction Factor data log: CF1,2,3,4- timing pull back by ECU due to high knock sensor activity.1-cylinder number one and so on. BTDC ? ignition advance. You can see as CF goes up ECU pulls ignition down. This present equally thru whore RPM range not just thru max power band. This would mean that WI have to be active thru whore RPM range. During normal cruise there is no CF noted. It only appears under the boost and can vary from during whole RPM range to showing up here and there. There is no consistency in knock. Looks like it is very unpredictable but load dependand. It is also noted that poor fuel quality will make it more intence as well Any comments anyone? |
#86
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If you inject water on a stock car you are unlikely to make any more power. Most likely you will *lose* some. Quote:
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It is high throttle/high load conditions that AFRs are meant to go richer. Quote:
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However, I doubt that you are getting any knock on a stock car running stock boost and the recommended fuel. Even if you do it will be on a very hot day and at max torque revs if you boot it real hard. The ECU will adjust timing a bit and that's that. |
#87
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#88
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If you stay within stock levels then power gains will be minimal. Quote:
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Try injecting 50/50 water/methanol and see how it goes. Even with a small jet (0.4mm) operating at 4psi (pretty low boost level by the standards here) knock should disappear, even if you push boost up to 1 bar. If you are still seeing knock, then it's probably noise that you're registering, not real knock. ...or your fuel is of very poor quality indeed :shock: |
#89
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Re: Tuning for water injection: fuel, ignition, and EGT
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When it get nice out I am going to attempt to run one more jet and hopefully 3-4 more pounds of boost. Victor 97 GSX, 32 psi with 1.0 & 0.8mm jets @ 100psi with 93 octane, roughly 12.8GPH. |
#90
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Hello,
First of all, this is a great post! For me, this graph below has been very informative with regard where to tune for. regards, Walter
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VW turbo street bug Best 1/4 mile so far: 11.06 @ 125 mph |
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