air injection delete thread

[David]

You only need it if your state checks for it. Ask your mechanic.

[Slantnose Steve]

Minne....Sota.
Don't need it...don't want it!
Thanks.
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Steve
1989 930S Factory Slant

[copbait73]

Originally Posted by Slantnose Steve

Any reason why I shouldn't have the the air injection system permanently removed during my current engine rebuild? I have B & B headers/exhaust system and a K27/7200 turbo on the car now, and see no reason why I can't have the extra weight taken off and have the engine holes plugged. I'll have the mechanic put the parts in a box in case a future owner wants to "restore" the exhaust system.
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Steve
1989 930S Factory Slant

Steve, I've displayed this chart several times but it's been ignored. My take is, after buying the new turbo and headers you are right back to the boost response available with a functioning air-injection system.

Maybe someone has run tests to disprove this possiblity. Enjoy

[tj930]

That's very interesting, 'copbait.'

My Euro car didn't have the airpump system when I bought it, but I'd have thought that running the pump alone would rob about 5->10bhp from the engine in the same way the A/C system does?

Also, for what car (US, Japan, RoW) is this graph?

190kW = 255BHP, so it's not a very powerful 911 turbo!

[ertech]

Hi all got a few questions..

If I want to remove from the top of the engine what do I do so the gas from the head does not escape?do I leave the "valve with the vacuum line to it ?how do i cut the belt I do not see it.

Thanks

[tj930]

Originally Posted by lucittm

Some pictures:



Mark

Just a thought, but wouldn't it be great if you could get 6 wideband Lambda sensors to fit into the vacant Air-Injection holes? (Measure the AFR on each cylinder and avoid having a JBL930-cylinder#5 moment at 180mph.)

[proffighter]

Originally Posted by tj930

Just a thought, but wouldn't it be great if you could get 6 wideband Lambda sensors to fit into the vacant Air-Injection holes?

This would be much to close to the cylinder. This position is too hot for the sensor (lifespan) and you get more constant values more off the cylinder.

[964 T #304]

You can moniter egt there .

[JFairman]

Originally Posted by proffighter

This would be much to close to the cylinder. This position is too hot for the sensor (lifespan) and you get more constant values more off the cylinder.

..and along with that, wide band sensors are supposed to be mounted right side or wire end up between 10 and 2 o clock to keep the sensor element away from any possible settled condensation in the exhaust pipe caused by short drives in humid weather.

[tj930]

Originally Posted by JFairman

..and along with that, wide band sensors are supposed to be mounted right side or wire end up between 10 and 2 o clock to keep the sensor element away from any possible settled condensation in the exhaust pipe caused by short drives in humid weather.

Yeah, I considered that it might be too hot for a Wideband Sensor, but completely forgot about the condensation problem. (Suppose that's what comes from looking at an upside-down photograph! )

With these 6 pre-cut holes, does seem a bit of a shame not to put them to some good use