[DeTomaso] Quella Low Pro MAP?

[Kirby Schrader]

Will,

There should be a MAP sensor on your system, but it is used to  
compensate for barometric pressure. It's probably mounted on the  
firewall somewhere.

I am assuming you have a Haltech which Quella supplied.... F9? Or  
earlier?

There are two ways to answer your question.

1) You can create a common vacuum 'box' or canister and then route all  
the individual runners/throttle bodies to it for a common manifold  
pressure.
Then, you hook the MAP sensor to the 'box'.

2) You ignore the manifold pressure, use the MAP for barometric  
pressure and use only the throttle position sensor for engine load.

I use method 1 on the GT40 and method 2 on the Pantera. Both work  
fine, in my experience.

The 'box' can be sort of seen in the middle of the manifold if you  
look closely at the pictures here.
http://web.mac.com/kirbyschrader/GT40/EFI.html
You can see the red vacuum hoses running from each throttle body to  
the 'box'. I have the MAP sensor located right on the rear of the 'box'.

I hope that helps. I think I answered your question. What I understand  
as 'alpha-n' is merely throttle position.
Correct me if I'm wrong...

Regards,
Kirby


On 27 Nov 2008, at 10:26 PM, Will Demelo wrote:

> I have Quella's low-profile IR set-up and I'm converting to a  
> current EFI system. Can someone confirm that  there is no MAP sensor  
> on the IR manifold? With no MAP signal, I'll have to tune in alpha-n  
> mode, correct? How does the system know when there is engine load?
> Will
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