I love it when basic shizz jumps up and bites me in the butt. I'll stfu and go away now...

 

No, the Honda MAP sensor is good for ~12 psig. However, if you want to run more boost, you will need a different MAP sensor. The Delco (GM) will work fine. However, if you are ****, the AEM sensor is superior but is roughly $50 more.


[Modified by quick108, 2:34 PM 1/27/2003]

 

85-91 MAP = 9.25 psi max.

92+ MAP = 10.65 psi max.

 

Where did you find this information?

 

AEM map sensor looks bling bling but does it perform bling bling as well?
I almost bought one until I saw the price tag so I'll wait alittle until I seriously find the GM unit annoying then I'll change it. I found that let's say I am pushing 15 Pound on the dot, the EMS fuel map is using 12 Pound cell for fueling. So pretty much I have a 12 pound fuel cell that is tuned to be a 15 pound fuel cell.

 

Most of the MAP sensor info I acquired through sifting a couple thousand DIY-EFI mailing list posts via their archives at www.diy-efi.org. I was looking for speed density theory and tech in order to redo my ignition map to include boost retard with AFC boost hacks.

I was ranting to USDM_ED9/Dropshop about how Doug @ Hondata gets 11.3 psi as the max range of the stock MAP where I was getting 11.8 psi, and how my math was correct, when he schooled me. If you use your AFC as a boost gauge, you get a max reading of +0.65 kg/cm^2 (9.25 psi) with the 85-91 MAP and a max of +0.75 kg/cm^2 (10.65 psi) with the 92+ MAP.

I went and verified with a couple different MAP sensors I have, and a Mityvac. I hooked the MAP sensors up to a spare computer PS's +5 signal, and applied "boost." 85-91 sensors peak at ~4.5 volts which is at or about where 9.25 psi should be, and 92+ (well, the 94 LS sensor I had) peaked at ~4.8 volts, which is 10.65 psi.

Pretty crazy shizz, huh?

 

Sorry i dont understand this.So its is like this.Your boosting 15psi,the ems map is tuned for 12psi of boost.So you have a 12psi base map and your running 15psi?What makes that possible?Sorry im new the the ems.

 

I have a 19 pound map but I usually push at 15 pound on the street. When I hit 15 pound on my boost gauge ( greddy ), EMS is using the cell (12psi, XXXX rpm) for fueling. It really doesn't matter since I have already tuned the maps to the a/f I wanted at every parameter disregard what ems is showing.
OMG, it's getting too complicated. Bottom line, I worked around the incorrect value and made it correct.

I used FJO monitor to tune my WOT since ems a/f parameter value is alittle off compared to the fjo. Since fjo comes preprogrammed, I trust fjo more than ems.

One wideband O2. Two unit is reading it. Two different values. Which one would you believe? FJO monitor or the EMS.


[Modified by [Evo]Hybrid, 3:46 AM 1/28/2003]

 

What is the differential? Remember, you can scale the voltage gain multiplier for the O2 sensors in the AEMPro software (O2#1 Gain).

 

Tried but it's off like less than .5 and it varies across ranges. At certain a/f, it perfect, at other a/f, it's off. The gain mulitplier can only adjust the entire range. I certain the scaling is off but I used the closest scaling provided by a supra ems owner. Everyone is currently using that one. Many will agree that it's not aligned perfectly. So I rather trust my FJO monitor.

 

http://www.aempower.com/bbs/viewtopi...1299&highlight=

This the thread telling you the new FJO caliberation.

 

You can tweak the AFR#1 Table in AEMPro to correspond with the FJO Display.

 

Then it gets really complicated on testing and testing and testing. Need to make a potentiometer corresponse to 5 volt switchable than test the difference between the fjo data vs. ems data. I'm no electronic wizard so I don't even know how to assemble a correct potentiometer ( I had attemped to and failed at radioshack).

 

No no no...just take a voltmeter to the O2 signal input and change the O2#1 Gain until the Oxygen Raw #1 parameter correlates with the voltmeter reading. Then tweak the AFR#1 Table if needed.


[Modified by quick108, 4:24 PM 1/28/2003]