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no, its like this...
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Posted by Dean (more from Dean) on Fri, 3 Oct 2003 06:45:35 Share Post by Email
In Reply to: Re: Water Injection on a '99 9-5, Ravi, Wed, 1 Oct 2003 16:02:53
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You can use water injection with a T7. The results will be less dramatic than with a pressure controlled T5.

It will have no effects on the trionic function any different than with a T5.

The T7 does not control torque in the manner that you describe. It does not control torque at all. It controls the air flow to the engine which is a measure of torque potential. Torque output of the engine is a complete unknown to the ECU. Changes to in intake, exhaust, fuel<-- including water injection, will change the ignition advance and turbine back pressure which largly determine what the engine shaft torque will be.

Insufficient octane in pump gas limits the power output. This effects engines at higher altitudes where the octane at the pumps is reduced. Some stock vehicles are more sensitive to this than others, such as the Viggen and Aero. And if one increases power with a modified ECU, then things get worse. With ECU mods, one may need water injection to get the engines potential if the local fuels are not up to the task.

Also note that at high altitudes with low octane fuel, that the T7 has the turbo compressor working harder than ever. So the exhaust gas back pressure from the turbine is higher as well. And the pressurized gas left in the combustion chamger after the exhaust valve closes will expand in the cylinder and limit the A/F charge induced. So to get the target air mass flows, the boost is then even higher! So there are some compounding problems. And the low octane and retarded spark and high compressor effort mean that the engine shaft torque will definatley be reduced.

posted by 208.24.17...

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