10psi at idle???

[blakktalon]

Currently running dsmlink v3 full version,speed density,all of my sensors are reading correctly in my logs, however when i hit the track log feature it shows my ecu running off of cells in the 10 psi range when at idle and actually at -10vac......any ideas?

 

[Bud92gsx]

So the problem is it's reading 10psi when It should be reading vacuem?

 

[stevenr816]

do you have the right map sensor/sensor selected?

 

[blakktalon]

yes i have the omni 4 bar selected as well as the baro to read it, on my log it shows -10 vac at idle and my boost gauge also shos that, when i use the "track log" feature on my speed density tab it shows it reading 10 psi cells at idle

 

[stevenr816]

yes i have the omni 4 bar selected as well as the baro to read it, on my log it shows -10 vac at idle and my boost gauge also shos that, when i use the "track log" feature on my speed density tab it shows it reading 10 psi cells at idle

That because Speed Density is based on Absolute Pressure. So with the car off does it sit at 20?

 

[blakktalon]

your asking if with the car off does the map sensor read 20 psi? or -20 vac or are you asking if the track log feature sits at 20 psi?

 

[stevenr816]

With the engine off, key on, tracking the datalog with speed density where does it sit? It should sit at 20 which will be your atmospheric pressure at your elevation.

 

[blakktalon]

i will go outside real quick and find out, shouldnt the ecu be reading the 0 psi cells at idle though? and if it does sit at 20 what can i do to get things where they need to be?

it is reading 14.7.......which is making me wonder if my wideband and map sensor wire is somehow switched?

 

[stevenr816]

No, your not fully understanding this. The SD Table is in Absolute Pressure, no way to get around this that I know of. Just like most map sensors are rated 50psiA. means there 14.7psi (1 bar) vacuum and 38.5psi (2.5) bar boost. The table reads the absolute pressure so when you go down to sea level you will see with the car off it will sit around 14.7 and as you go up in elevation it will change.

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[blakktalon]

so my question is do i start adjusting the cells that begin at 10 and go up from there? a bit confused since the last speed density program i ran had cells from -20 vacuum all the way to 30 psi i believe and ive never dealt with this graph before

 

[stevenr816]

There might be a way to change it, i havent found out how to change the parameters yet.
So I would tune, depending if you have the narrow band emulator hooked up. From 10 to X and with the "auto tune" from i would say 0psi (20) up to X