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AEM, Supra 550 and stock O2 [Archive] - Toyota MR2 Message Board

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AEM, Supra 550 and stock O2 [Archive] - Toyota MR2 Message Board Toyota MR2 Message Board > Toyota MR2 Generations > MK 2 MR2 - SW20 > MK2 Stand-Alone EMS and Nitrous Discussion > AEM, Supra 550 and stock O2 PDA

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rcohen05-03-2007, 08:45 PMMy current setup is:
Cams oem
Intake Manifold oem
Turbocharger TDO6- 20G
Fuel system; Supra 550's, supra pump and ATS FPR
Ignition System oem / MSD 6AL
Spark plugs ngk copper
GM 3bar map and AIT
AEM Guage type O2 sensor (not run to EMS yet)
Stock O2 sensor
Exhaust system custom 3"
Any modifications to the head; 1mm oversize intake and exhaust with full street port
Any compression ratio changes; je pistons 8.5:1 compression
Adjustable cam gear settings. Straight up


In the stock 91' 3sgte map I noticed that the o2 #1 is set up for a ntk sensor. When I start my car it runs really rich (10 - 11) in the AEM UEGO (not run to the EMS yet). When I look at the setup map for the NTK O2 it only measures from 4 to 9 AFR. Is this correct.? Seems wrong to me. What O2 sensor setup am I suposet to use for O2 #1 if I will use stock. I don't even know what voltage range the stock O2 uses. Also, I have Supra 550's. AEM onlygives a choice of the Denso or RC in the wizard. Which ones should I select and are they high impedance or low impedance. Do I have to eliminate the stock resistor pack??? I used the stock cal and changed to the Gm AIT and MAP and wasn't sure about the injectors. Does anyone know the battery offsets for the Supra injectors? After I change the injectoer map do I then rescale??

Thanks for any help RickyB05-04-2007, 10:30 AMThe AEM does not work with stock narrowband O2 sensors. The only way to have any kind of closed loop control on an AEM is to purchase a wideband controller. Then, you feed the 0-5 volt AFR output signal produced by the controller into the AEM and calibrate the AEM tables so that they reflect the proper AFR for each given voltage point (which the wideband manufacturer should be able to provide). The O2 wizard has settings for some common controllers so you don't have to know the voltage output information for these. After this is done you have to finish the calibration procedure by setting the O2 gain parameter properly.

The AEM drivers work only with high impedance injectors. This means that you either run low impedance injectors and leave the resistor pack connected or that you run high impedance injectors and bypass the resistors. rcohen05-04-2007, 08:46 PMThanks Ricky, always there when I neeed you.........


The AEM does not work with stock narrowband O2 sensors. The only way to have any kind of closed loop control on an AEM is to purchase a wideband controller. Then, you feed the 0-5 volt AFR output signal produced by the controller into the AEM and calibrate the AEM tables so that they reflect the proper AFR for each given voltage point (which the wideband manufacturer should be able to provide). The O2 wizard has settings for some common controllers so you don't have to know the voltage output information for these. After this is done you have to finish the calibration procedure by setting the O2 gain parameter properly.

The AEM drivers work only with high impedance injectors. This means that you either run low impedance injectors and leave the resistor pack connected or that you run high impedance injectors and bypass the resistors. rcohen05-05-2007, 08:06 AMI went to load the denso "high" impedance 550's but the wizard only lists Denso 550, 660 and 720's all 2ohm. Can I use the RC Engineering 550's listed at 13 ohm???


The AEM does not work with stock narrowband O2 sensors. The only way to have any kind of closed loop control on an AEM is to purchase a wideband controller. Then, you feed the 0-5 volt AFR output signal produced by the controller into the AEM and calibrate the AEM tables so that they reflect the proper AFR for each given voltage point (which the wideband manufacturer should be able to provide). The O2 wizard has settings for some common controllers so you don't have to know the voltage output information for these. After this is done you have to finish the calibration procedure by setting the O2 gain parameter properly.

The AEM drivers work only with high impedance injectors. This means that you either run low impedance injectors and leave the resistor pack connected or that you run high impedance injectors and bypass the resistors. MikeV05-05-2007, 07:09 PMThe Denso's are low-impedance injectors.... that's why you need to leave the resistor pack inline. Powered by vBulletin® Version 4.2.5 Copyright © 2026 vBulletin Solutions Inc. All rights reserved.

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