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-   -   ITB's - How do they work (http://forums.pelicanparts.com/porsche-911-technical-forum/409099-itbs-how-do-they-work.html)

Trog 05-13-2008 11:09 AM
ITB's - How do they work
 
How is air-flow measured with ITB's? Does the Motronic (or equivalent) controller still need an air-flow signal to meter the correct amount of fuel?

Just wondering...

Tyson Schmidt 05-13-2008 11:44 AM
With no airflow meter, the computer relies on the throttle position sensor, intake air temp sensor, rpm, and manifold pressure (MAP) sensor to "estimate" the engines fuel requirements.

Trog 05-13-2008 02:26 PM
So I guess I have to trash the Motronic and replace with aftermarket computer?

Jeff Alton 05-13-2008 02:28 PM
That is what I did!

Bill Verburg 05-13-2008 02:32 PM
Quote:
Originally Posted by Jeff Alton (Post 3940396)
That is what I did!
what engine management are you using?

Jeff Alton 05-13-2008 02:34 PM
My 3.4 runs on a Micro tech. Very stable, reasonably priced and easy to use soft ware.

Cheers

Bill Verburg 05-13-2008 02:37 PM
Quote:
Originally Posted by Jeff Alton (Post 3940404)
My 3.4 runs on a Micro tech. Very stable, reasonably priced and easy to use soft ware.

Cheers
what throttle bodies are you using?

Jeff Alton 05-13-2008 02:40 PM
jenvey

Trog 05-13-2008 04:50 PM
Can I continue to use the Motronic to control ignition, and use another controller for the ITB fuel delivery?

alniki 09-28-2008 10:50 PM
Quote:
Originally Posted by Trog (Post 3940620)
Can I continue to use the Motronic to control ignition, and use another controller for the ITB fuel delivery?
Any response for this?
I'm considering acquiring a used kit consists of Jenvey ITB and Haltech F10 ECU among other stuff.

spence88mph 09-29-2008 01:06 AM
I am going to use one of these when I get around to it to replace my AFM, www.mapecu.com, just wish i had the time to tinker.


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