Hi,

Got a 3.3 Bar map sensor(factory style), looks to be plug and play for a ls6 manifold.

Just wondering what MAP scaler values you needed to get the sensor to read 101kpa at key on.

also read of another user not being able to get it to read below 40kpa and had trouble with idle cruise tuneing, any feedback appreciated.

 

Can you post more details (part number and picture) of this sensor?

 

part number on box is - PS10087
will get a pic up tomorrow but looks the same as factory, just a couple of extra tabs that need to be trimed off to make fit.

got it in and calibrated to read 101 kpa at key on, needed "446" in Map sensor scaler table (seems kinda high)

MAP in logs follow same cells as my 2bar sensor just giving it a bit of free revving and back to idle, but tune is now way off , has gone super lean everywhere and will need pretty big numbers even in the idle cells to bring it back into line !!!

any suggestions ?
any other map based tables need adjusting to compensate ?

 

If this is the sensor I am thinking of it doesn't read vacuum for ****, which is also why it's used on Diesels mostly. Your cruise/idle/decel fueling will be muddy depending on how much vacuum your motor makes. I think you would want 330 in the map sensor scalar for that sensor but I can't remember off the top of my head what the curve looks like on the OEM spec sheet.

 

Which 3 bar do you prefer? We have been using this Duramax one and it seems to be working well everywhere. If there is a better plug-n-play, I would certainly like to try it out. And yes, should be in the 330-345 Kpa range on the high end.

 

I have to have the map sensor scaler (efi live) at 446 to get the sensor to read 101 kpa at key on.

seams to read fine in vaccum but tune has gone extremly lean for some reason.

will have it on the dyno tomorrow and see what i can do with it, may go back to the 2bar if it gives me greif.

only looking to run 18psi, just wanted the 3bar for a bit more tuneability/safety, at that level,
and to be able to log boost all the way to 18psi.

 

I have tried the 3.3 bar MAP on my BS3 with no luck. I'm not sure if it's the sensor or another issue. I have posted a thread on this so not to hijack.

 

I had no luck with it either,
ended up ditching it and going back to 2 bar sensor.

 

I'm going nuts with my deal as it seems the old style isn't really working either.

 

Why not run the 12223861 3 bar GM sensor?

Is it becuase you want a sensor that plugs into the intake? The regular 3 bar you mount on the firewall and nobody has an issue with. Its used on pretty much every aftermarket ecm.

Just asking..

 

I have that sensor now and it still doesn't work. I'm not sure if my BS3 is f'ed now because I used that other sensor or what. Just not sure at this point. I originally chose the 3.3 bar sensor because the pigtails matched. I guess I assumed because it was a 3.3 bar and plugged right up that it would be fine. I suppose I just hated hacking up my BS3 harness. As far as sticking in the intake, that didn't matter as I have a Victor Jr.

 

I'm not a tuner (not at all, ha ha) but i did watch my tuner geoff when he dialed it in.... he used 289 and then the box below it (efi live) he used 47 to get it to 100kpa and to get the left/right fuel trims to zero as compared to my 2 bar tune. My VE was at 56 at idle. I do not know the correct terms in tuning so excuse my description. It runs great as this is my daily driver. One thing i do notice is the AFR hunts around a little while cruising but it runs just fine. I hope this helps someone. Best of luck.

 

Basically you try and match a sensor to your intended goals as far as boost.

If you run 13 PSI boost, a 2 bar is better suited. Just like if you shift at 7000 then an 8k tach is fine. But if you get a 20K tach... then its hard to see the needle at 7000. In other words, putting a 3 bar sensor will not make you faster unless your running more than 16 PSI and less than 32 PSI.

Maybe your plugs are wired backwards?
If this helps.
Terminal A is ground.
Terminal B is signal
Terminal C is +5 vdc

Key ON.. 5 volts applied, sea level.. terminal B will read 1.6 volts on a 3 bar. 2bar will read 2.3 volts.

 

I run a maf setup, use the stock map for the map input on the pcm and send this map sensor voltage to the AC pressure sensor or EGR pintle position to scan it.

 

I run a custom 2.5bar map sensor that uses a stock, modified 1bar sensor. Running a 3bar sensor will gain no safety and actually lose tuneability over going with a 2..or 2.5 bar. My sensor goes all the way up to 255kpa or 22.9psi.

http://www.dpecorvettes.com/gpage4.html is where I got it from and have been running it for the past 6 months with no problems.

 

You're reading too far into that post. I was just making the point that the 3.3 bar didn't work.

 

Did you get the 3 bar working?

 

You should run a MAP sensor that matches your intended boost range. For someone running 10 PSI boost.. a 2 bar is better suited.

Someone running 20-23 PSI.. a 2.5 bar.

Someone running 28 PSI.. a 3 bar.

 

I run 6-15psi for now and this one works absolutely great.

 

Technically a 2 bar would have been a better choice for that boost range. But I understand, and it is what it is . And you saved money using the Motorola sensor.