Re: fifth-gear and miles per gallon

[Jeremy Salda <roccoguy@mac.com>]

That flap is dependent on how much air is moving, which is dependent on 
who open the throttle body is, which is the throttle position. So if the 
throttle body is wide open, the max amount of fuel is being pumped into 
the engine. If the TB is half open, than the fuel delivery is half. So I 
would think the throttle position would be the determining factor on 
mileage. Of course I could be wrong, it has been known to happen.

jeremy


On Wednesday, October 31, 2001, at 03:48 , Marc Peterson wrote:

> Assuming no enrichment is used...
>
> All CIS/CIS-E engines mixed by the air flow meter flap.  If the engine 
> is
> running at a given RPM, it is pumping a fixed amount of air though it, 
> so to
> my understanding 3000 rpm is the same amout of fuel whether it is 1/2 
> or 3/4
> throttle, the mixture doesn't change based on the throttle position.
>
> This is different on Motronic system, obviously.  They have a throttle
> position sensor.
>
> I think the above is right.
>
> Marc
> ----- Original Message -----
> From: "Fry, Larry" <LEF@chem-tronics.com>
> To: <scirocco-l@scirocco.org>
> Sent: Wednesday, October 31, 2001 4:33 PM
> Subject: fifth-gear and miles per gallon
>
>
>> Hypothetical situation: you have fifth-gear ratio that gives 3800rpm at
>> 80mph and it takes 1/4 throttle to maintain that steady speed.
>> second hypothetical situation: you have, on the same car, on the same
>> stretch of road, a fifth-gear ratio that gives 3000rpm at 80mph but it
> takes
>> 1/2 throttle to maintain that steady speed.
>>
>> question: which situation yields the best mileage?
>>
>> In other words, which influences miles-per-gallon more, rpm or throttle
>> position?  Or is it pretty much a wash?
>>
>> Inquiring minds......
>>
>> Larry  sandiego16V
>>
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