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I've searched the archives for info on WI and have come up with nothing that explains my problem. In short, I purchased a system, installed it, and am getting a very good spray pattern from the Aquamist .7 nozzle I purchased from Brad at KC Saab. The remainder of the system consists of non-Aquamist components, but are all operating properly. It is set to activate at 10 psi of boost on this '95 9K Aero (T5, I think) with aftermarket ECU, and 3" exhaust system, and K&N internal filter (stock replacement). Everything else is stock.
The problem is that the WI is not improving boost at the times I really need it, during summer months when temperatures are 90°+. If I punch the car when it is just at operating temperature, as the thermostat begins to open, I get decent boost, sometimes approaching 20 psi. However, as the heat soaks in it will usually boost only to 10 psi, then stop with no indication of reaction to detonation. At other times when detonation sets in it will boost to perhaps 13 psi, then back off to 11 or 12, presumably a reaction to detonation. Whether or not WI is working seems irrelevant, as I can disable it at will using a swtich on the dashboard. It is only after driving for 5+ miles in very hot weather will it become limited in this fashion. I am using 93-octane gas, the highest available here, and have tried different brands with no variation.
It is as if the ECU is telling it "Okay, it's too hot, stop boosting now."
What sensor is instigating this? The air-temp sensor on the intake tube is about 3" downstream of the WI nozzle and I would assume the WI is affecting its reading when activated.
With the installation of the WI I was really expecting boost to climb
to near-winter levels (>20 psi) even in the hottest weather, but I'm getting almost no benefit from this addition. Any ideas would be appreciated.
posted by 68.11.251...
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