PalmFist Posted August 14, 2014 Report Share Posted August 14, 2014 Yeah, about a year ago... I'm on a special duty assignment and don't have the time to peruse the thread as much as I'd like. Im only about ten pages in... Lol The formula for the AEM analog output is already established . I've been logging thru the rear O2 pin (A34 I think ) with it in TunerPro since Feb Nice. I'll have to a search the thread and look at some info for my notes. This is who I went with.http://www.plxdevices.com/ Thats some nice tuner pron Link to comment Share on other sites More sharing options...
TIZIO AKA 1 HND MEC Posted August 14, 2014 Report Share Posted August 14, 2014 Matt pointed me toward the 4100 AEM, great product, plenty of wire, bung for the exhaust, etc, very happy with the product!!! Link to comment Share on other sites More sharing options...
fwdGTP Posted August 14, 2014 Report Share Posted August 14, 2014 I like AEM because of the auto calibrated sensors, I have had on fail though, but sensor replacements aren't that expensive anyway. Link to comment Share on other sites More sharing options...
lookforjoe Posted August 14, 2014 Report Share Posted August 14, 2014 Nice. I'll have to a search the thread and look at some info for my notes. I have the AEM 30-4100. The formula I use is in my ongoing thread, this is what works for me (((X* 0.0196078) - 0.2)*2) + 10 Link to comment Share on other sites More sharing options...
Timbo Slice Posted August 14, 2014 Report Share Posted August 14, 2014 Matt, if you're going to be using TunerPro to tune you'll have no need for the extra capabilities of the second gauge (failsafe), although attaching a buzzer to the failsafe would be pretty neat. Both units have a 0-5V linear output, suitable for data acquisition to the ECU. @straightfive - A wideband measures the amount of oxygen in the exhaust stream, so its output is independent of fuel type used. The gauge measures Lamda and the conversion between Lambda and AFR varies based on the fuel you're using. Usually, people who run E85 just keep their gauges' running in gasoline mode, since they are more familiar with the standard AFRs for gasoline (14.7 for stoich, 16.4 for maximal MPG, etc.) As you're using a different air/fuel mixture for the E85, optimal AFR for E85 would be lower than 14.7, no? If Stoichiometric for E85 is ~9.5, how would running a normal gauge with 11-17 limits be viable? I know they make AFR gauges with different lower and upper limits specific for E85 applications, but I never thought using a standard gauge would work.. Maybe I'm confused as to what you mean. Link to comment Share on other sites More sharing options...
Tightmopedman9 Posted August 14, 2014 Report Share Posted August 14, 2014 As you're using a different air/fuel mixture for the E85, optimal AFR for E85 would be lower than 14.7, no? If Stoichiometric for E85 is ~9.5, how would running a normal gauge with 11-17 limits be viable? I know they make AFR gauges with different lower and upper limits specific for E85 applications, but I never thought using a standard gauge would work.. Maybe I'm confused as to what you mean. The air to fuel ratio that widebands display is a made up number. They don't actually measure the amount of air to fuel, they measure the amount of oxygen present in the exhaust stream. This is called Lambda, which is converted to the appropriate air to fuel ratio number based on the fuel type you specify. When you run E85 and you see 14.7 on your gasoline calibrated wideband, the actual air to fuel ratio is 9.5. Link to comment Share on other sites More sharing options...
Timbo Slice Posted August 14, 2014 Report Share Posted August 14, 2014 AH. That makes sense. Link to comment Share on other sites More sharing options...
PalmFist Posted August 14, 2014 Report Share Posted August 14, 2014 I have the AEM 30-4100. The formula I use is in my ongoing thread, this is what works for me (((X* 0.0196078) - 0.2)*2) + 10 Thanks for that LookforJoe Link to comment Share on other sites More sharing options...
Straight Five Junkie Posted August 14, 2014 Report Share Posted August 14, 2014 So anyone using e85 should get an e85 specific gauge? Link to comment Share on other sites More sharing options...
Tightmopedman9 Posted August 14, 2014 Report Share Posted August 14, 2014 So anyone using e85 should get an e85 specific gauge? I'm not trying to be condescending, but did you read what I posted? Link to comment Share on other sites More sharing options...
Straight Five Junkie Posted August 14, 2014 Report Share Posted August 14, 2014 Yeah, just a little confused. I get the 14.7 part if I were to run regular gas, but on e85 I'll still see the 14.7 but it will be actually 9.5. So I guess to answer my own question, yes I can use the regular wideband gauge?? Does that sound about right? Link to comment Share on other sites More sharing options...
Tightmopedman9 Posted August 14, 2014 Report Share Posted August 14, 2014 Yeah, just a little confused. I get the 14.7 part if I were to run regular gas, but on e85 I'll still see the 14.7 but it will be actually 9.5. So I guess to answer my own question, yes I can use the regular wideband gauge?? Does that sound about right? Yes, you are correct. People leave their gauges in gasoline mode when running E85 since they are more familiar with the numbers as they relate to their AFR target. Link to comment Share on other sites More sharing options...
Straight Five Junkie Posted August 14, 2014 Report Share Posted August 14, 2014 Yes, you are correct. People leave their gauges in gasoline mode when running E85 since they are more familiar with the numbers as they relate to their AFR target. Sweet. Will pick one up. On a side note, how can I contact you regarding tunes? Ive seen here that you are one of a few besides ARD thats involved with ecu tuning. Link to comment Share on other sites More sharing options...
Tightmopedman9 Posted August 14, 2014 Report Share Posted August 14, 2014 Just shoot me a PM... Link to comment Share on other sites More sharing options...
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