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#151
15-02-2006, 09:58 PM
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Quote:
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Richard L aquamist technical support 
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#152
15-02-2006, 10:03 PM
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RIchard, what was the name of that diagnostic bit of kit you suggested, I've forgotten.
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#153
15-02-2006, 10:15 PM
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Quote:
http://www.innovatemotorsports.com/ Richard
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Richard L aquamist technical support
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#154
15-02-2006, 10:37 PM
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Mike,
You have managed to try out your fuel leaning tool (extra lean MAF sensor) before I try out mine. The results showed how lean you can run your engine and still gain some power increase. I would never have dare to run lambda at .93 on someone's car!! you were very brave!!! :twisted: :twisted: :twisted:
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Richard L aquamist technical support
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#155
15-02-2006, 11:18 PM
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Well I think if I didn't have the water injection, the engine could be dead by now!!!! I won't be trying it again though.
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#157
16-02-2006, 07:48 AM
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I may be reading this wrong, but it appears to me that the wi has had little effect on power. I am assuming the first graph has no wi.
I have logged a large change in inlet temps (60C-38C) and would have expected some increase in power due to a cooler charge. However these graphs are showing no real change in power delivery. Sad to say, but I am beginning to think that wi on the Astra is not effective in raising power levels. I have other reasons for this thought. Please, don't think I am being negative. I have spent considerable money intergrating a wi on my car, and I would love it to work.
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#158
16-02-2006, 09:53 AM
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There were a few clues as to why WI was not effective in this case.
Temperature reduction is very small when the ambient air was at 7 degC during the dyno and not having been able to use the MAF due to the re-mapped ECU displaying irregular afr pattern. See the black curve on the bottom of each plot. I believe Vaxuall has done a great job making the engine very difficult to tune, It appeared the boost pressure is controlled by the ECU. This was shown by the progressive drop in boost pressure at the RPM climbed, the aim of the exercise by to achieve a flat torque curve regardless of anything else. I have also noticed the designed of the turbo components. The intergrated inlet flange, the tiny exhaust manifold and electronic bleed valve arrangement, all seemed to indicate and confirm that Vauxhall is making this Astra difficult to tune for extra power. After giving some though after the dyno session, I concluded that the only way to get power is to remove some of the restrictions imposed by the mechanical design. But before embarking on such an assumption, I think the next simplest thing to try is to gentlly modifying the boost curve - I have some ideas how this can be achieved. Finally apart form abandoning the last dyno run midway, we can see the positive effect of WI when power gain was achieved midpoint during the momentary lean running. I would like to continue the development if Mike is willing to continue - modifying the boost cuve to acieve one or more psi after it has dropped to 12psi after the initial 18psi and bear fruit. Anyway , not quite given up the fight with Vauxhall yet.
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Richard L aquamist technical support
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#159
16-02-2006, 12:46 PM
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Richard
I have been running without WI since December, I have found out why my "in pipe" jet "union" failed, it was inserted back to front with the wide flange on the outside! Now I have my new intercooler fitted I can locate the jet after the cooler, but before the map/temp sensor. I shall do this over the next couple of weeks and then see what happens on Courtenay's Dyno (if Jon's happy to do so) and also rig up a cooler spray to see if any gains can be made there too. It's looking to me that the WI is only going to be effective when the ambient temp climbs and the charge temp gets close to the 70 deg C, after which the mapping chucks in extra fuel as a fail safe (I assumed you knew this trigger point, but never reached it?). Not given up yet, but I don't want to trim the map to remove fuel for obvious reasons, I have rebuilt a C-LET once because of detonation and I don't fancy a Z-LET based reincarnation!
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#160
16-02-2006, 01:22 PM
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There are instances where WI will sustain good gains in winter if the engine is highly tuned for it. I am trying to designed a interface unit that will allow WI to be effective all year around - Mike's car was my attempt down this route. Processing re-processing sensor signal is a low-cost affair, if it can be incorporate into the WI setup at minimal cost. you will get the WI benifit all year around and it is not a risky add-on either. Most engine management is equipped with active knock control and as well as boost control. It just DOESN'T know that water injection has the effect as putting in a tank of higher octane fuel instantly (as during the dyno run), if Mike car is allow to run with WI for a few weeks, the engine management should adjust itself to accomondate the "knock" suppresssion properties of water and create new maps to suit. I think the Astra will benifit with mid-range torque increase with WI and top-end power requires more mechanical mods. Trimming the fuel can not be used unless you have a consistant MAF sensor - too risky. I was withnessing the immediate afr leaning after Mike change over the MAF element during the dyno session. If you want to further your tuning potential, I recommend you getting the Innovate wide band lambda unit. Armed with this unit, you can be very safe during any home or road tune. There are just so many ways to tune and there is not enough time....
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Richard L aquamist technical support
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