<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by -TRINiTRON- &raquo;</TD></TR><TR><TD CLASS="quote">I was wondering because they have the "chip" on ebay that lets the computer think that the air is actually 20 degrees cooler than it really is and it is supposed to make powa. Sounds like a load to me but I was jus wunderin.</TD></TR></TABLE>

No because they will just add more fuel and probably bog the car. You will make less power.

 

late this spring as in what month , i need my **** done right, i cant wait. hehe

where are you located.

platinum.

 

If your speed-density is working like it should, then there shouldn't even ned to be any correction.

A proper S-D system knows the mass of air entering the motor, which means consistient A/F ratios.

 

good stuff guys.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kpt4321 &raquo;</TD></TR><TR><TD CLASS="quote">If your speed-density is working like it should, then there shouldn't even ned to be any correction.

A proper S-D system knows the mass of air entering the motor, which means consistient A/F ratios.
</TD></TR></TABLE>

this was not the case with the aem ems. but it may not have been compensating correctly / not enough resolution in the proper regions.

 

The hondata has air temp correction, but it's not tunable, right? They take the air temp comp map that honda made and use it. This is as good as it gets, for the most part. The problem is that when you change the injector size, the scaling for that map changes a bit and since it's not adjustable, you just have to deal with it. With the ems, speed pro, and just about all other standalones, this is adjustable. However, i'd venture to say that about 90% of the adjustable ones aren't even set as close as the hondata one. The only way to really set it is to run the car at all temps and change that map until your a/f is constant. It'll take a full year for the most part, changing it whenever the weather changes.

And about the speed density deal, this type of system measures manifold pressure and air temperature to figure out density. Without and air temp sensor, you can't figure out density.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 &raquo;</TD></TR><TR><TD CLASS="quote">With the ems, speed pro, and just about all other standalones, this is adjustable. However, i'd venture to say that about 90% of the adjustable ones aren't even set as close as the hondata one. </TD></TR></TABLE>

tony, remember the GM air temp sensor you welded into my charge pipe to get more accurate temp readings? i still couldnt get it to perform better than stock. it still heatsoaked too.

i think BLKMGK is the power user of the AEM EMS with his supra. he put the temp sensor in his intercooler endtank and apparently got his car running good in all conditions.

i am quite happy with the p28 obd1 ecu running a custom / uberdata rom i made..simulating the narrowband signal from the wideband (thats why i never showed up for a 2nd o2 bung welded in.) Fuel trim is a wonderful thing.

just need to control IABs or go skunk2 IM and i'll be all set.

 

Does your temp reading change with weather? It should a little. You gotta remember that the air is being heated by the turbo, so the air temp change outside doesn't make as much of a difference by the time it gets heated and cooled by the ic. I would think that your temp sensor should read pretty accurately since it's actual air temp @ the tb, rather than heat soaked air temp from within the manifold. At speed, i don't think the air is in the manifold long enough to really pick up much heat so your sensor should be more accurate? If anything, at part throttle, the oem sensor might be more accurate?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kpt4321 &raquo;</TD></TR><TR><TD CLASS="quote">If your speed-density is working like it should, then there shouldn't even ned to be any correction.

A proper S-D system knows the mass of air entering the motor, which means consistient A/F ratios.
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Speed/Density systems, AFAIK, do not know the mass of air entering the engine. Through a lot of R&D, VE tables are arrived at, so its more of a best guess.

MAF based systems can determine the mass of air.

 

well I'm running hondata and 800cc injectors. I noticed an initial tune done at around 80 degrees leaned out from 12:1 to 12.8-13.0:1. I also hollowed out my cat during this period so it isn't exactly correct. Anyway I have a fjo so for me it isn't a big deal. Open map, add 5% fuel to higher regions, download, done. Takes maybe 15 minutes.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 &raquo;</TD></TR><TR><TD CLASS="quote">Does your temp reading change with weather? It should a little. You gotta remember that the air is being heated by the turbo, so the air temp change outside doesn't make as much of a difference by the time it gets heated and cooled by the ic. I would think that your temp sensor should read pretty accurately since it's actual air temp @ the tb, rather than heat soaked air temp from within the manifold. At speed, i don't think the air is in the manifold long enough to really pick up much heat so your sensor should be more accurate? If anything, at part throttle, the oem sensor might be more accurate?</TD></TR></TABLE>

tony, the temp sensor went up to 100-105F and stayed there, it would drop slightly when i boosted and the dense cooled air from the IC was flowing past it, but overall it got hot and stayed there. i.e. it was useless.

but the aem ems is gone so that sensor is disconnected. thats why i wanted it spliced in and not replacing the stock sensor plug. when i switched to a honda ecu, the car actually ran fine with the GM sensor in place, as it just reports a different temperature range. i think the temp sensor is used mostly for cold start fuel enrichment on the honda ecus. the o2 sensor is the true governor.

but like i said, i dont think you're going to be able to correct for changes in air temp like Mase is suggesting without a true ambient temp reading.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EE_Chris &raquo;</TD></TR><TR><TD CLASS="quote">

Speed/Density systems, AFAIK, do not know the mass of air entering the engine. Through a lot of R&D, VE tables are arrived at, so its more of a best guess.

MAF based systems can determine the mass of air.</TD></TR></TABLE>

The whole point of ANY air metering system is to know the mass of the air entering the motor. Some measure this more directly than others, but nothing can do it without a calculations.

The amount of R&D that goes into an ECU like the Honda OEM ECU is tremendous, so the VE tables are going to be VERY close.

HOWEVER, VE is not really an issue here, if the VE is off, then the A/F ratio will be off all the time, in any conditions, under any weather, under any level of load. On the other hand, if the A/F ratio is off only under certain weather conditions, there are really only 2 options:

1: The Speed-Density just isn't correcting right, it shouldn't have an issue with that.
2: The ECU is designed to change the A/F ratio with temperature.