asianspeed

I finally installed my wideband o2 sensor and egt and all that good stuff and I went to street tune. Later I found out that my zeitronix datalogger doesn't read boost without getting their 3.5 bar map sensor. But I was able to hook up my map sensor to the user input on the zeitronix. But I found that to be quite useless because nobody tunes their car by comparing the rpm to map sensor voltage. They compare the rpms to in/Hg and psi. So I dug deep in my high school algebraic skills and formulated a spreedsheet that helps with converting a stock honda map sensor voltage to in/Hg, psi and mbar and vice versa. I know this will help me tremendously in tuning and I thought I'd share it with you all.

Enjoy

mbar/ volt/ in/Hg psi
0.0000 0.0000 -29.5400
0.0500 0.1435 -28.0630
0.1000 0.2870 -26.5860
0.1500 0.4305 -25.1090
0.2000 0.5740 -23.6320
0.2500 0.7175 -22.1550
0.3000 0.8610 -20.6780
0.3500 1.0045 -19.2010
0.4000 1.1480 -17.7240
0.4500 1.2915 -16.2470
0.5000 1.4350 -14.7700
0.5500 1.5785 -13.2930
0.6000 1.7220 -11.8160
0.6500 1.8655 -10.3390
0.7000 2.0090 -8.8620
0.7500 2.1525 -7.3850
0.8000 2.2960 -5.9080
0.8500 2.4395 -4.4310
0.9000 2.5830 -2.9540
0.9500 2.7265 -1.4770
1.0000 2.8700 0.0000
1.0500 3.0135 0.7250
1.1000 3.1570 1.4500
1.1500 3.3005 2.1750
1.2000 3.4440 2.9000
1.2500 3.5875 3.6250
1.3000 3.7310 4.3500
1.3500 3.8745 5.0750
1.4000 4.0180 5.8000
1.4500 4.1615 6.5250
1.5000 4.3050 7.2500
1.5500 4.4485 7.9750
1.6000 4.5920 8.7000
1.6500 4.7355 9.4250
1.7000 4.8790 10.1500 / Stock Honda 1.7 bar
1.7500 5.0225 10.8750
1.8000 5.1660 11.6000
1.8500 5.3095 12.3250
1.9000 5.4530 13.0500
1.9500 5.5965 13.7750
2.0000 5.7400 14.5000 / 2.0 bar MAP sensor
2.0500 5.8835 15.2250
2.1000 6.0270 15.9500
2.1500 6.1705 16.6750
2.2000 6.3140 17.4000
2.2500 6.4575 18.1250
2.3000 6.6010 18.8500
2.3500 6.7445 19.5750
2.4000 6.8880 20.3000
2.4500 7.0315 21.0250
2.5000 7.1750 21.7500 / 2.5 bar MAP sensor
2.5500 7.3185 22.4750
2.6000 7.4620 23.2000
2.6500 7.6055 23.9250
2.7000 7.7490 24.6500
2.7500 7.8925 25.3750
2.8000 8.0360 26.1000
2.8500 8.1795 26.8250
2.9000 8.3230 27.5500
2.9500 8.4665 28.2750
3.0000 8.6100 29.0000 / 3.0 bar MAP sensor
3.0500 8.7535 29.7250
3.1000 8.8970 30.4500
3.1500 9.0405 31.1750
3.2000 9.1840 31.9000
3.2500 9.3275 32.6250
3.3000 9.4710 33.3500
3.3500 9.6145 34.0750
3.4000 9.7580 34.8000
3.4500 9.9015 35.5250
3.5000 10.0450 36.2500
3.5500 10.1885 36.9750
3.6000 10.3320 37.7000
3.6500 10.4755 38.4250
3.7000 10.6190 39.1500
3.7500 10.7625 39.8750
3.8000 10.9060 40.6000
3.8500 11.0495 41.3250
3.9000 11.1930 42.0500
3.9500 11.3365 42.7750
4.0000 11.4800 43.5000 / 4.0 bar Map sensor
4.0500 11.6235 44.2250
4.1000 11.7670 44.9500
4.1500 11.9105 45.6750
4.2000 12.0540 46.4000
4.2500 12.1975 47.1250
4.3000 12.3410 47.8500
4.3500 12.4845 48.5750
4.4000 12.6280 49.3000
4.4500 12.7715 50.0250
4.5000 12.9150 50.7500
4.5500 13.0585 51.4750
4.6000 13.2020 52.2000
4.6500 13.3455 52.9250
4.7000 13.4890 53.6500
4.7500 13.6325 54.3750
4.8000 13.7760 55.1000
4.8500 13.9195 55.8250
4.9000 14.0630 56.5500
4.9500 14.2065 57.2750
5.0000 14.3500 58.0000 / 5.0 bar MAP sensor

rextec

nice job i had done this on my zeitronix as well. this will be helpful to others im sure.

riddlinkid1986

okay, this dose not make much sense to me so here i go...

Im usein the 2.5 map sensor an getting a CEL3 with my p28. Im tuned on uberdata. I hooked my vafc back up to i could look at my voltage/mmhg an see what my sensor is doing.


Looking at this chart, i can not find what my voltage should read for my PSI im running.

Im useing the motorola 2.5 sensor, running 10psi. What should my Map voltage be at 10psi, an what should my mmhg be at 10psi?

Any help would be great! Im lost!

HiProfile

A 2.5bar MAP should read about 3.17v at 10psi of boost. As for mmHg, that's rarely used - its inches of Hg [mercury] (aka: in Hg, in/Hg, Hg"). Not only that but mercury is used primarily for reading vacuum, not [boost] pressure. You can figure it out by doing the math, since 25.4mm = 1". BTW with the key on (datalogging working) and engine off, it should read about 1.88v.

If you have uberdata, it shouldn't throw a code for the MAP, unless its hooked up incorrectly. You also have to tell the EMS which sensor you are using; changing the MAP w/o retuning is bad.

riddlinkid1986

thanks man!


Yeah i had a base map from pharable.net i used for like 5 months with the motorolla map an it worked great! Then, i get tuned an i get a CEL..... IT SUCKS!


Im useing p28, with uberdata 1.7. with the 2.5 sensor slected. Tuned that way. I checked the Voltage with my key on, an got like 4.8V on the power, 1.8 on the other, an ground. So i know my stuff is hooked up right.

I re-cheked an rechecked wiring, order.... voltage.... ect... i even hooked back up my vafc to i could watch the voltage an see what happens when the CEL comes on. The car stalls out after 900 rpm an dies. so i mean it is hardly idelin lol...

But when i get the cel, i click my keys off, then back on an it goes away. Till i Decell useing my brake then 9/10 i get that dam cel. Code 3.


Watching my voltage with the vafc i dont ever see it drop, i will wiggle my harness around in the engine bay, an going to the ECU an never see my voltage buge! arge!

any help is better then no help! thanks for reading! I will watch my VAFC voltage an see what i peak at, on 10psi.

I know in mmhg, after a pull i get a reeding of +0.010mmhg.......

thanks!

riddlinkid1986

oh, i checked my map voltage at 10psi. Its at like 3.10 lol. so my sensor is working corectly. So i would assume its uberdata. can anyway i can just copy an paste my fuel maps on a frsh new map? maybe mine has a krupt file..