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Old 08-01-2008, 09:46 AM
Releeuw45 Releeuw45 is offline
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Location: Veldhoven
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Default Detonation prevention effects quantified?

I/m using a 12:1 CR 750cc engine with 4-7 psi boost. Although it's intercooled the engine is theoretically on the edge of detonation.
What would be the benefits of direct port WI in term of lowered EGT, degrees ignition advance or changed max boost level? Is it possible to quantify this.
My only aim here is preventing detonation. Power is no issue, but I want to be able to run 5 psi minimum preferrably more to keep the GT2052V Garrett turbo in it's efficient range.

I'm using 4 0,3mm jets and a HSV valve running on 20% to 40% PWM. Pump set at 75psi. This is to limit the injected amount of water to the recommended 10-20% of the fuel weight.

Thanks and other suggestion to optimise my setup are welcome.
Dutch track addict, GSXR 750 turbo, 200BHP.
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Old 10-01-2008, 10:19 PM
keithmac keithmac is offline
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Location: York / UK
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Have you any means of detecting and logging engine knock?. I`m injecting 1.2l/min of 25%water 75%methanol and found this gave me an extra 6 to 8 degress of igntion advance and the ability to run 10 more psi off boost on my 3l 24v TT engine than on just 97ron petrol.
VW Mk2 Golf 16VG60 - Mitsubishi GTO TT
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Old 18-01-2008, 06:43 PM
JohnA JohnA is offline
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Posts: 352

Is there a boost threshold over which you start injecting water?
You don't want it to start too early, there is only a limit of how much water you can carry on the bike for starters eh


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Old 11-06-2018, 09:30 PM
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Join Date: Oct 2003
Location: Utopia
Posts: 511
Exclamation Re: Detonation prevention effects quantified?

This is a good thread with not much input over the years.

Knock control is the #1 most important thing to be in control of in any engine and especially in a water injected one.

I forever have been talking about this in recent years since working with many different engine types and arguably the most sensitive/fragile one (the Wankel engine).
NOTE: All ECU's are NOT created equal > https://www.motec.com.au/forum/viewt...hp?f=39&t=3920 < Going joke here

Life Racing ECU's and derivatives (Syvec's) are the 'gold standard' in this field, I get asked often why do you choose to run them over anything else and the simple answer is they are the only manufacturer who make their own turbocharged racing engines run at the highest levels of professional motorsports where power and efficiency is paramount *Lemans 24hr LMP1 class*. The same hardware and software is available to simple people like us, and it just works! there is no BS excuses or guess work or caveats to arse cover unlike some of the pretenders out there and their groupies shit talking over electronic mediums mostly. No multiple guess's required, just one simple set up stage, a competent calibrator and you too can run your engine to its pre detonation limits.

I've been using Water Injection since 1992, and while its amazing and un equaled in its ability to eliminate detonation it needs for ultimate reliability to be combined with an engine control unit that will be the ultimate decider on when things are not just right. And those instances when you are at the pointy end of stable combustion running at the maximum BMEP in the harshest conditions let alone when some other sub system lets you down (bad plug, faulty main fuel injector! etc) are all too frequent and very common. Therefore its a must to have a known system in charge to take responsibility over your engines survival and knock control is the final word in this topic. If you don't run a unit that can do this you are playing with near certain death to your engine.

Stop playing with toys and/or getting on the bandwagon of a glossy hyped up alternatives, pick a unit that is proven by real experts, not arsebook gagtube self promoters
RICESP > F40 > Zonda > ZR1
Water Injection Specialist
"Can't be defeated!, don't know the word!, shoulder to shoulder!, we'll fight the world!, WE CAN'T BE BEATEN!!!"
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