Tom-Guy

You're all idiots.

The first bar of a MAP sensor's reading is neatly eclipsed by the 14.7 psi of atmospheric pressure.
85-91 MAP = 9.25 psi
92+ MAP = 10.6 psi

You can make stock MAP sensor read 21.5 psi, though, it's easy. You just dig the OE sensor out of the casing and stuff a Motorola 2.5 bar inside it.

Inquisition

Prove any of this. And if you post logs from ANY of the rom editors I will laugh.

Tom-Guy

Like I just make up numbers to LIE.

Inquisition

Yep. So where is the proof?

trex661

for the OP: you dont need a 3 bar mapsensor your fine up to 12 psi on the stock sensor. :1

Tom-Guy

Go search my posts on HT circa '01-'02, I did a nice little write up with a DVOM, 5v PS, and air compressor. I pointed out how ZDyne got OBD0 MAP correct @ 9.25 psi limit, and Hyundaidata got everything terribly, terribly wrong claiming 11.3 psi, and demonstrated not only how they deduced 11.3 from MAP scalars in the ECU but also demonstrated that the-o-rectal upper limit of Honduh MAP is 11.8 psi *if it could return full 5v* and that they got 11.3 from rounding errors.

Blundar, JDogg aka JDouchelordMBAseekingnoskillpossessingfaggot, Speed Phreak, Tr1t0n, and a few others were present in March '04 when I asked Doug MacMillan of Hyundaidata why his website claimed 11.3 psi, derived from code and rounding errors, when they in actuality returned 10.65 psi? His glib response was that all of the OBD1/OBD2 sensors they tested returned various upper limits, as low as 10.4, but this is obvious horseshit. Why claim 11.3 psi fixed value? Why advertise this with no tech blurb/disclaimer, rendering accurate boost cut control in software useless?

Inqyfag, you are a ------- Legend among zero experience having recycled information of various accuracy spewing Internet Keyboard Warriors. At no time do you - or will you ever, at this rate - possess a fraction of my experience or my the-o-rectal knowledge. My every tech post and every write up and every car I tune or build or sort or fix attests to this - do not think that just because I ask people not to ----- dyno sheets combined with my name, do not think I don't have a pile of them.

What have you done? Nothing... except get every tech post you make wrong, and insinuate that I lie. Well? Prove it. Prove anything. Burden of proof is in your court, seeing as you're the Nobody With Something To Prove. :1


You got the :1 part right, nothing more.

ifly87

atmosperic pressure is 14.7 psi at sea level, if you live higher than that your sensor's limit will be slightly different.

Inquisition

No, I'm insinuating that your accuracy to the hundreth's place is absolutely ridiculous and that I don't trust that whomever gave you the information probably didn't do too much on the testing side. Seriously, look at Hondata. They ------- release software for years and its full of bugs. They release IAT/ECT correction and its just ----. Their credibility does not go too far with me regardless how much you love their Limey accents. You're arguement makes you lose some credibility simply because you make it look like any map sensor outputs up to 5V. Look up some data sheets. None that we use do. I've yet to see one that does. So yea, saying it reads up to about 11psi is good enough. If you want to use exact numbers to the hundreths place, you better have data to back up your statements.

And Ifly, these are absolute sensors. The idea of psi really doesn't work with them but basically any point past 14.7psi or 1013mbar is concidered positive pressure. This can vary a huge amount from gauge pressure but thats the way every EMS software in the world works. This means if you go up to colorado and lets say it has an atmospheric pressure of 13.7psi and before you were at sea level with an atmospheric pressure of 14.7psi and you ran a naturally asperated engine, at WOT the map sensor would read 13.7psi(or close enough) but your pressure gauge would read 0psi. The idea behind the ECU is that it knows a number of corrections which will mean if you tuned for section in the map that corresponds to 13.7psi the car should run just dandy.

Tom-Guy

Point made, but since I was illustrating math errors made by Hyundaidata in a pure math environment (code) then the extra decimal places become very valid... especially when the real world sensor is accurate enough to display a pressure to output line that projects 11.8 psi at hypothetical 5v return. However, the funny thing is, while offset may vary, the max output is repeatable to a hundredth of a volt - we are not dealing with a large span 2-3% accurate unit like GM, Honeywell, Kavlico, Motorola. I used a lab meter to measure and a quality PS, not some toys.

Excuse me? Gave me the information? Can you not read?

Can you not read? Where did I say anything flattering about Hondata?

And they aren't Limeys, they are Kiwis. Some Limeys are actually bright, Kiwis are dumb farm boys.



Hyundaidata's ASSumption is that the Honduh MAP is a 0-5v return sensor.

We use GM MAPs, which are 5v return sensors.

I am full well aware that Kavlico (or the Honeywell ASP100 6.9 bar I have on the shelf) are 0.5-4.5 volt return, and that the Motorola 2.5 bar is a 4.9v return.

:1 dur dur dur dur you are a ------- dumbass! :1

PSI works with them. Are you saying pressure measurements don't work with pressure transducers?

Tom-Guy

BTW - I like how I went from LYING to losing some credability. Inqyfag, you suck at accuracy and significant digits when dealing with the English language.