So i went to go change some valus on my lt10s and I notice that like on the load it doesn't show me hg values. It has rpm 0500 1000, rpm is fine. But after rpm, it sayd load 11%, 48% etc. Not in hg values. How do I change it back?? It was in hg before but now its not. Please help

 

Sounds like you may have switched the ECU from speed density to Alpha-N.

 

I figured it out. Under the first or last maps There is an option to select tps or map. Under tps it goes to %, under map it goes hg. Phew! Also, when changing hg values. Is going higher in hg richer? or is going down in hg value richer?

 

As you go down in hg (mercury), your load goes up along with the required amounts of fuel. Hg is just a measurement of pressure, and is used in automotive worlds as a negative measurement of pressure. 2" Hg is roughly equal to -1 psi (or 1 psi below atmospheric)

On an N/A, max load is technically achieved at 0" Hg, because at that point the amount of air outside the throttlebody (atmospheric) is coming into your manifolds as quickly as possible and filling your engine with maximum air.

 

^oh okay. So if 2 hg is -1 psi, 4 hg is -2 psi? So if I needed to richen the mixture of fuel and air, I would need to lower the hg, to negatively allow more load which also lets more fuel in? Am I understanding that correctly trots?

 

Generally, as vacuum decreases, you will require more fuel as load is going up. Not always the case, but generally. At idle, for example, you'll tune for maximum vacuum with the most stable engine.