95bowtie

Purchased the efi source 3 bar plug n play ls1/ls6 map sensor to use on my 04 gto with 3 bar os/hpt.

Had nicd send me a 3 bar base tune to start with since I don't have my original tune to apply the 3 bar os to.

He scaled it for a older brick style gm 3 bar I think he said (correct me if I'm wrong) and it absolutely is not reading correctly.

Started the car up and it just chugged and ran a 9.00 afr at 400 rpm. Washed the cylinders down trying to start it only a few times. Trashed the oil pretty good haha but that is a whole other issue.

Changed the VE table in the 100kpa to 130 kpa range to idle values instead of boost and the car will sit and idle around 14.50...

Been emailing efi source about some tune data and they said they have none for hp tuners software....wouldn't it be the same as if you were using mega squirt etc?

I asked them simply what the operating range of the sensor was or anything like that so I could be used in the calibration settings and she said she does not understand what I want.....lmfao luckily it was only 35 bucks ha.

Anyone that uses the old brick style efi source sensor what data are you entering in for the tune?

schmendog

iTrader: (10)

Supposedly others have it used the EFI source MAP successfully, Denmah posted that he sets the following numbers and it works fine

scaling 305 kpa
10.33 spacing

I haven't tried mine yet. I did call them weeks ago, but like you I spoke to a woman who had no Idea what I was talking about lol. I emailed them this morning in hopes that it will reach someone who knows what their doing.

denmah

iTrader: (2)

i have no problem using it with hptuners.

NicD

iTrader: (7)

I asked and they said it was the same as the old block style 3 bar map sensor that came in the turbo TA. That means it's got a wonderful 8% deviation at the high and low end of the scale and won't read vacuum for ****.

Should be either 1.11 / 315.58 or 43.24 / 313.51 for the settings depending on which old style 3 bar block map sensor it's supposed to be like. Since i don't have one I can't test it exactly on the bench.

95bowtie, that means there is something wrong with the sensor at that point if it's reading that far off and not really moving.

schmendog

iTrader: (10)

They sent me this just now, not sure if it's helpfull or not




Nic if your willing to do it, I could send mine to you to test.

RonSSNova

iTrader: (3)

From that chart, you would enter 3.6 for the offset and 315 for the linear.
In HPT, offset is defined as the sensor reading at 0V out, and the linear is defined as the sensor reading at 5V out.

The numbers NicD cited above 1.11/315.58 are what I calculated from the transfer function for the Freescale sensor I used in my home made 3 bar.

Good that they provided those.

Ron

DSX Tuning

iTrader: (1)

Ehhh, I hate soldered connections because they are brittle. I also cut the plug off and replace it, but I also have all the Kent-Moore crimpers.

That's not correct. The value at 5v is not the linear value. The linear value is the range across five volts. Your offset is correct for the Freescale sensor, but your linear value is not.





The Freescale elements blow everything else away. Personally, I think they're more accurate than the Bosch 12592525 sensor, but for applications that easily accept the Bosch sensor, it's a no brainer considering the time and effort to do anything else.

schmendog

iTrader: (10)

So what are the correct values according to the chart then? Or is more information needed?

RonSSNova

iTrader: (3)

Those crimpers are hard to beat. I agree with you.

I think I'm getting confused on the Freescale transfer function by trying to use 5v for Vs when their function is based on 5.1v.

So, one more time.

Vout = Vs ((0.00318 x P) - 0.00353)

P= ((Vo/Vs)+.00353)/.00318 (rewritten to solve for pressure)

Vs = 5.1v this time.

If I put their Vo of 4.912v full scale it works. Calculates to 303.98 kpa. compared to the max published of 304 kpa.

Then put in 5v for to get the 5v output it calculates to 309.41 kpa.

Linear = 309.41- 1.11 (offset) = 308.29kpa.

Did I finally get it?

DSX Tuning

iTrader: (1)

Nope.

got-a-ls1

iTrader: (12)

305 10.33 works fine with my efisource 3 bar. boost guage reads -11 inches at idle and map is around 65kpa.

if you figure that 19 inchs hg roughly equal to 65kpa id say its working ok. i dunno, i went 114 mph in the 1/8th mile this weekend on 16 psi so its working for me lol.

RonSSNova

iTrader: (3)

Ok, I was right the first time, should have used the 5.1v and thought a little harder about ratiometric sensors.

I come up with 314.465

Ron

The Alchemist

iTrader: (19)

I picked up the 2.5 map sensor from DSXtuning and it was worth the investment to me.

Like people have said, he's not making a lot off selling them. Between his investment in materials, and his time involved, it's worth it to me.