mkiimaniac
09-23-2006, 01:12 AM
Ok boyz, go easy on the Maniac, as this is unchartered territory for me and am getting my feet wet. I have read several threads by you guys but still need a little guidance here in between my additional Google searches....
Here is the problem, which does cross-reference into a thread I have started "safc on an 82- who has done it?" but b4 getting too technical there i thought it better suited here for you big brained standalone tech-talkin circuit lovin brothers...
Problem is for the SAFC to tune effectively I need the inputs from both RPM & TPS but as many know the input from 82 TPS will not work in the 0-5v range that the SAFC wants.
Now since both MAP & TPS are putting out voltage, I don't think the SAFC knows/cares whether its from a TPS or MAP sensor & will respond with corrective fuel signal outputs to ECU accordingly (to how i have it set)
If I haven't murdered it too bad, read on.
My question is simply can I use a MAP sensor & run it to the SAFC MAP sensor input wires IN PLACE of the TPS signal input so the SAFC will have a more accurate reading of what is going on in the manifold (boost vs no boost)?
If yes, which map sensor is recommended? I don't quite undertsand the 1 bar 2 bar 3 bar shit but here is what I found on another Import Turbo thread about Map sensors,etc...
Has anyone done this & if so can you help me out a little? I finally broke down & got a SAFC2 & brand new LM-1 Wideband so I am prepared somewhat to do this.
Heres what that thread had to say.....
_____________________________________________
"on a stock map sensor, the amount of boost you can run is limited due to the fact that it doesn't know what to do with it, and throws a code.
OBD0 .65 KG/cm2= 9.24 PSI
OBD1-2 .75 kg/cm2 = 10.66 PSI
if you want more than that, you need to run a GM 3-bar map sensor (common) or others like the gm 2.5bar, the aem 3.5, and there are other crazy ones out there that are like 5 or 6 bar.
Remember, your tuning software must have the proper voltage assigned to the sensor. Both stock and the 6 bar maps operate on a fixed voltage range (0-5volts), but each psi moves a different amount of voltage over. Therefore it is imperitive to be using the right map sensor's output voltage range when you're tuning, and thus in your software.
A linear example (not accurate numbers, just for display purposes)
Code:
0------------------------------------5v 0----1----3-----5------7------9-----11 psi (oem) 0-1--3--5--7--9---13--15--19---21---27 psi (gm 3bar) 0-5--10--18--23--27--32--38--41--48-56 psi (5bar)
keep in mind, 1 bar is alread used by the atmospheric pressure, so it leaves you about 2 bars give or take your elevation left for boost... about 26-28 psi (depending on elevation) on a GM 3-bar."
Here is the problem, which does cross-reference into a thread I have started "safc on an 82- who has done it?" but b4 getting too technical there i thought it better suited here for you big brained standalone tech-talkin circuit lovin brothers...
Problem is for the SAFC to tune effectively I need the inputs from both RPM & TPS but as many know the input from 82 TPS will not work in the 0-5v range that the SAFC wants.
Now since both MAP & TPS are putting out voltage, I don't think the SAFC knows/cares whether its from a TPS or MAP sensor & will respond with corrective fuel signal outputs to ECU accordingly (to how i have it set)
If I haven't murdered it too bad, read on.
My question is simply can I use a MAP sensor & run it to the SAFC MAP sensor input wires IN PLACE of the TPS signal input so the SAFC will have a more accurate reading of what is going on in the manifold (boost vs no boost)?
If yes, which map sensor is recommended? I don't quite undertsand the 1 bar 2 bar 3 bar shit but here is what I found on another Import Turbo thread about Map sensors,etc...
Has anyone done this & if so can you help me out a little? I finally broke down & got a SAFC2 & brand new LM-1 Wideband so I am prepared somewhat to do this.
Heres what that thread had to say.....
_____________________________________________
"on a stock map sensor, the amount of boost you can run is limited due to the fact that it doesn't know what to do with it, and throws a code.
OBD0 .65 KG/cm2= 9.24 PSI
OBD1-2 .75 kg/cm2 = 10.66 PSI
if you want more than that, you need to run a GM 3-bar map sensor (common) or others like the gm 2.5bar, the aem 3.5, and there are other crazy ones out there that are like 5 or 6 bar.
Remember, your tuning software must have the proper voltage assigned to the sensor. Both stock and the 6 bar maps operate on a fixed voltage range (0-5volts), but each psi moves a different amount of voltage over. Therefore it is imperitive to be using the right map sensor's output voltage range when you're tuning, and thus in your software.
A linear example (not accurate numbers, just for display purposes)
Code:
0------------------------------------5v 0----1----3-----5------7------9-----11 psi (oem) 0-1--3--5--7--9---13--15--19---21---27 psi (gm 3bar) 0-5--10--18--23--27--32--38--41--48-56 psi (5bar)
keep in mind, 1 bar is alread used by the atmospheric pressure, so it leaves you about 2 bars give or take your elevation left for boost... about 26-28 psi (depending on elevation) on a GM 3-bar."