04 SRT-4 - need help w/ 3.5bar map/tip sensor rescale!

[duster360]

And his last email told me to "check baro logged on DSDV and check actual BARO and tell me the difference and ill adjust it"

not sure what that's spose to mean... :dunno: Baro is 14.33 at ign on, car off. not sure what else he wants from aside from that.

And I already told you how to do that too. I guess you didn't bother to listen then either

"Baro around here floats between 14.2-14.8psi depending on the weather. I suggested a separate independant [barometric pressure]gauge. Weather report will work too."

Get a Barometric pressure gauge or call the local weather man.

If your Baro PID says 14.33psi but the weatherman or Baro gauge says 14.79psi, tell Brain that the BARO is (14.79 - 14.33 = .46psi) .46psi off.

gotcha. sorry for the hard headed-ness. if i was a proficient tuner, i wouldn't exactly be in this predicament...lol

looked up weather for my town, and baro is 29.97in (mercury, i assume yes)

went to http://www.convertunits.com/from/inches ... bsolute%5D

and 29.97in equals out to 14.7198psi

14.7198-14.33 = .3898psi

is that linear, or how does that work in retrospect to the map scaling? because at upper psi, its off more at say, 20psi, than what it'd be at 5-10psi.

thanks for the help..

The two slopes (correct vs incorrect) will diverge at higher values. If its .4psi off at 1bar, it could easily be off 5psi once you get to 2.5bar.

Just tell Brian its off .3898psi off.

[DRASTIC.]

And I already told you how to do that too. I guess you didn't bother to listen then either

"Baro around here floats between 14.2-14.8psi depending on the weather. I suggested a separate independant [barometric pressure]gauge. Weather report will work too."

Get a Barometric pressure gauge or call the local weather man.

If your Baro PID says 14.33psi but the weatherman or Baro gauge says 14.79psi, tell Brain that the BARO is (14.79 - 14.33 = .46psi) .46psi off.

gotcha. sorry for the hard headed-ness. if i was a proficient tuner, i wouldn't exactly be in this predicament...lol

looked up weather for my town, and baro is 29.97in (mercury, i assume yes)

went to http://www.convertunits.com/from/inches ... bsolute%5D

and 29.97in equals out to 14.7198psi

14.7198-14.33 = .3898psi

is that linear, or how does that work in retrospect to the map scaling? because at upper psi, its off more at say, 20psi, than what it'd be at 5-10psi.

thanks for the help..

The two slopes (correct vs incorrect) will diverge at higher values. If its .4psi off at 1bar, it could easily be off 5psi once you get to 2.5bar.

Just tell Brian its off .3898psi off.

ahh, starting to make sense. it's hard to picture what exactly is going on without being able to see first hand whats being done in the software.. but that helps.


anyways, i sent my actual baro to what the baro pid is reading on my DSDV, and brian said he knew what was wrong immediately after i sent him the email and he sent me a diff tune file to try that consisted of some changes.

I'll give that a shot tomorrow and will report back.

[DRASTIC.]

tried diff scaled tunes from brian after i told him actual baro.

1 was 13.7
the next was 10.9baro

he said he's having a hellof a time because the 3.5bar sensor's diff voltage scalling is screwing up how to scale it properly.

ima give it a few more tries...

if no luck im parking the car for the winter.
after researching, there are 4bar sensors that are 0-5v like our cars instead of .5-4.5v like my 3.5bar. im sure the 4bars could get scaled within 2-3 logs, and not 30+ diff scalings like ive gone through thus far.

[fwdperf]

tried diff scaled tunes from brian after i told him actual baro.

1 was 13.7
the next was 10.9baro

he said he's having a hellof a time because the 3.5bar sensor's diff voltage scalling is screwing up how to scale it properly.

ima give it a few more tries...

if no luck im parking the car for the winter.
after researching, there are 4bar sensors that are 0-5v like our cars instead of .5-4.5v like my 3.5bar. im sure the 4bars could get scaled within 2-3 logs, and not 30+ diff scalings like ive gone through thus far.

This was a long time ago but, I am interested in knowing if it ever got resolved. I have a car on my dyno right now that is built to the hilt. I made 611hp at 5800rpm on a 3bar setup with e85, AGP1200 injectors, Crane18s and a COMP 6265 Triple BB turbo. Despite this being completely unstreetable, my customer wants more. I told him the next step was 4bar map and ID2000 injectors. He arrived with 2 AEM 3.5 bar maps and the ID2000's. So I install the injectors and the sensors. ID provides great injector data so I'm confident that is good, however, the AEM 3.5 sensors are a mystery. at KOEO with slope set to 350Kpa/4.86v and offset at 7.2, the baro read pressure shows 112Kpa, it should be 101.374 at my location. Also, the MAP shows 1.57 volts and the Tip shows 1.59. The car runs like crap...pig rich with fuel trims of -32% at idle, and the going straight lean with a throttle stab. IDK, I could hack around and probably get the car close but I'd rather not because I'm trying to sort some other issues out that may or may not be related. Like a sudden fuel cut during moderately aggressive throttle engagement ( entering the freeway ) and the fact that the car absolutely nose dives after 5800 RPM.