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-   -   just tried out my new vac-gauge (https://ecomodder.com/forum/showthread.php/just-tried-out-my-new-vac-gauge-9392.html)

IsaacCarlson 07-25-2009 06:38 PM

just tried out my new vac-gauge
 
1 Attachment(s)
at idle it reads 19-20 depending on alt load. At highway speeds it reads 12 inches in fourth gear and 17 inches in third gear. I would like to get some opinion of which gear i should cruise in because third will probably be easier for the engine, but fourth has lower revs. i just don't know if the lower revs are making up for the lack of vacuum. and i also realize that at lower revs the engine does not pull a high vacuum because it is not using that much air.
i know i will probably end up testing to find out anyway but i am wondering if anyone has been over this dilemma before.

oh and is 4 inches going uphill in fourth better than 7-8 in third?
Attachment 3917

nubbzcummins 07-26-2009 10:54 AM

When I had my toyota tacoma I used a scan gauge that would read out real time air flow through the MAF meter to get an idea on my fuel being used. Take your air flow in lb/min and divide by 14.7 which will give you the lb/min of fuel being injected. I used 14.7 as this is the air/fuel ratio my o2 sensor tried to keep the mixture. I did this at 60mph so it was 1 mile per minute to make calculation easy. At 0 vac in o/d it was using roughly 5lb/min air so it was injecting .34lb/min or mile fuel. Gas is around 6lb/gallon from what I remember so I divided 6 by .34 and came up with 17.65 which will be my mpg at 60mph and 0 vac. You can do this at any speed, gear, rpm, vac, boost, conditions, ect as long as you can hold the vac/boost steady long enough to get a reading. Hope this helps.

cfg83 07-26-2009 02:09 PM

IsaacCarlson -

Cool beans. It's a 2 for 1 because the gauge will also help you "gauge" the health of the engine :

http://ecomodder.com/forum/member-cf...e-chart-01.jpg

http://ecomodder.com/forum/member-cf...e-chart-02.jpg


CarloSW2


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