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Microtech Up in hg is richer? or is down in hg richer?

Old 03-25-11, 08:28 AM
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Up in hg is richer? or is down in hg richer?

When changing hg values. Is going higher in hg richer? or is going down in hg value richer?

stupid question but with my non working car Im not sure what is happening or not :p
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Old 03-30-11, 01:44 AM
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Id say down is richer as when i increase the value the motor revs higher (Running leaner)
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Old 03-31-11, 09:12 AM
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The question actually doesn't make any sense. HG is a measure of vacuum, which really has nothing to do with AFRs and not something you change through software but a condition that the engine generates.
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Old 04-01-11, 02:00 PM
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Old 04-04-11, 01:56 PM
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Originally Posted by uptonboy View Post
Id say down is richer as when i increase the value the motor revs higher (Running leaner)
the unit value next to the Hg" will be the injector duty cycle in which unit i can't recall right now, but i believe it is in fractions of a millisecond. so in the following example the actual duty cycle would be 15.8% or .158 milliseconds.

for example:

15"Hg - 1.58 the 1.58 is the open time of the injector. raising the 1.58 value results in more fuel, lowering the value results in less fuel.

the Hg" and boost PSI measurements are exactly that, stages in engine load under the particular engine RPM that you are adjusting. if you think by raising the Hg" value you are making adjustements, you aren't, you are just simply selecting a new load cell, the figure next to that load cell is the actual fuel adjustment figure.

your wideband figures for example may be at 12.8 for idle, when raising the 1.58 value the AFRs should drop(ie something like 12.0 AFR). the lower the AFR figure the RICHER the engine is running, the higher the value the LEANER the engine is running. if your car is acting in reverse then you have some issues to resolve with the microtech or the fuel setup. i don't know what exactly because it makes no sense to me why it would be doing the reverse, so i am just going to assume you aren't reading your wideband correctly or making adjustments properly.

in laymans terms, the figure next to the Hg"/PSI is the injected fuel amount, the higher the figure the more fuel is being injected, the lower the figure the less fuel is being injected.

in AFR laymans terms, the higher the AFR number the leaner the engine is running, the lower the figure the richer the engine is running.

this is all very basic stuff and is very easily outlined in the microtech manual and many other places...

Last edited by RotaryEvolution; 04-04-11 at 02:04 PM.
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Old 04-05-11, 08:49 AM
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For the basics, this is the book you want:

http://www.amazon.com/dp/1557885575?...W2H758M4D9Z4A&

Awesome read.
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Old 04-05-11, 10:01 PM
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Thanks aaron and Karack. I think I got it all figured out now and I am able to tune my engine more now. And trots, how is your post helpful at all? that previous thread I started about % was fixed. For others that have this problem its a simple fix. Obviously, I have no idea what I am doing and need help... So please don't get on my case. BTW, I dont have dimentia, I am color blind :p
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Old 04-06-11, 08:55 AM
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Seriously dude, if you would've read the answers I and Aaron gave you in the last thread about this same question:

Originally Posted by lilsht View Post
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?
OR read the Microtech manual: http://www.microtechefi.com/software/ltmanual.pdf

OR searched, yes, even wikipedia can explain what Hg is.

you could be a self-sufficient person, but instead you're choosing to start a thread on every question you have (or in this case 2), so I see what road this is going down.

Apex seal countdown, T minus 1 WOT.

Good luck with your tuning sir.
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Old 04-06-11, 04:25 PM
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It is always "just research and you'll find your answer." When I come on here its a last resort. I can't find my answer, calling microtech in australia cost me a 230 dollar phone bill. Getting answers is all I ever wanted and I figured its a 2 second reply for experienced ppl to just tell me whats up. Don't you think I own the manual? I set up all the wiring but when I ask a no brainer question why do I have to get someone to tell me to look in the manual and google it. It is less keystrokes for someone to just say do this or do that. Simple as that.

And what does apex seals have to do with this? I just want the car to run, not WOT drag passes. I stated this in my thread already and I can't blow any seals if the car won't run in the first place.
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