S2000 STR prep resource
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From: Atlanta, GA
Originally Posted by NJDrive,Sep 30 2009, 08:29 AM
That's arguable since the stock airbox draws from the slots in the air guide. It's a dual purpose piece as far as I'm concerned. It doesn't really matter for me anyway, since it is such a minor detail in a proper STR build.
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The STAC would like feedback on opening up 14.10.F to allow ECU “piggybacks” that directly control or modify engine functions
such as fuel injectors and ignition timing (ignitor, coil, etc). Current allowances restrict piggybacks to acting only as “signal
modifiers” on the ECU inputs. Direct control would be restricted to fuel, ignition, and VTEC switchover points. Sensors
must be OE. Emissions legality as defined in Appendix F and 14.10 would still need to be maintained, which means that
OBDII systems must be intact and operating as the manufacturer intended. NOTE: The goal with this proposal is to allow an
alternative, cost-effective method of performing the same functions allowed by current rules. This is not final rules language.
This proposal would be effective 1/2011.
such as fuel injectors and ignition timing (ignitor, coil, etc). Current allowances restrict piggybacks to acting only as “signal
modifiers” on the ECU inputs. Direct control would be restricted to fuel, ignition, and VTEC switchover points. Sensors
must be OE. Emissions legality as defined in Appendix F and 14.10 would still need to be maintained, which means that
OBDII systems must be intact and operating as the manufacturer intended. NOTE: The goal with this proposal is to allow an
alternative, cost-effective method of performing the same functions allowed by current rules. This is not final rules language.
This proposal would be effective 1/2011.
I already wrote a letter. I'm not sure its applicable to an OBD2 car. Yeah there are a ton of Greddy/AEM/APEX piggyback units out there to do this and get a decent chunk of power. The problem is that as soon as you assume control of the Injectors and Ignition with the piggyback, you cut the OBD2 feedback loop in the OEM ECU - whether or not the car throws a code is irrelevant. The OBD2 system is not operating as the MFG intended.
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From: Detroit, MI
Originally Posted by TheNick,Sep 30 2009, 08:07 AM
Thoughts? Per October Fastrack.
I already wrote a letter. I'm not sure its applicable to an OBD2 car. Yeah there are a ton of Greddy/AEM/APEX piggyback units out there to do this and get a decent chunk of power. The problem is that as soon as you assume control of the Injectors and Ignition with the piggyback, you cut the OBD2 feedback loop in the OEM ECU - whether or not the car throws a code is irrelevant. The OBD2 system is not operating as the MFG intended.
I already wrote a letter. I'm not sure its applicable to an OBD2 car. Yeah there are a ton of Greddy/AEM/APEX piggyback units out there to do this and get a decent chunk of power. The problem is that as soon as you assume control of the Injectors and Ignition with the piggyback, you cut the OBD2 feedback loop in the OEM ECU - whether or not the car throws a code is irrelevant. The OBD2 system is not operating as the MFG intended.
http://sccaforums.com/forums/thread/381307.aspx
does taking over the ignition output really affect OBDII? im not sure it does, but i'm no OBD expert.
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From: Azusa
Originally Posted by NJDrive,Sep 30 2009, 05:29 AM
That's arguable since the stock airbox draws from the slots in the air guide. It's a dual purpose piece as far as I'm concerned.
See the October 2008 Fastrack, page 46, Tech Bulletin #2 if you want to see what the SEB has to say on the issue.
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Originally Posted by angryfist,Sep 30 2009, 11:35 AM
hmm... i just posted about this in sccaforums a few weeks ago with little to no response.
http://sccaforums.com/forums/thread/381307.aspx
does taking over the ignition output really affect OBDII? im not sure it does, but i'm no OBD expert.
http://sccaforums.com/forums/thread/381307.aspx
does taking over the ignition output really affect OBDII? im not sure it does, but i'm no OBD expert.
I"m not an expert either - but as far as I know - anything that you don't "share" with the ECU will affect the OBD feedback control loop.
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From: Detroit, MI
Originally Posted by TheNick,Sep 30 2009, 08:50 AM
Yeah I saw the Fastrack today and I immediately thought of you - I was like "how ironic..."
I"m not an expert either - but as far as I know - anything that you don't "share" with the ECU will affect the OBD feedback control loop.
I"m not an expert either - but as far as I know - anything that you don't "share" with the ECU will affect the OBD feedback control loop.
i'm most familiar with the greddy emanage but the other systems work very similar.
so you are cutting the "controller" in between the ecu output and the ignition/injectors. at this point the ecu is just outputting a signal to these devices. you are modifying that output to a different signal whether it be adding or subtracting. if you are just modifying that ECU output then this should have no effect to the OBDII system at all. the ECU will still get all the correct inputs from every sensor, etc...
make sense??
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Originally Posted by angryfist,Sep 30 2009, 12:28 PM
so correct me if i'm wrong but this is what i'm thinking...
i'm most familiar with the greddy emanage but the other systems work very similar.
so you are cutting the "controller" in between the ecu output and the ignition/injectors. at this point the ecu is just outputting a signal to these devices. you are modifying that output to a different signal whether it be adding or subtracting. if you are just modifying that ECU output then this should have no effect to the OBDII system at all. the ECU will still get all the correct inputs from every sensor, etc...
make sense??
i'm most familiar with the greddy emanage but the other systems work very similar.
so you are cutting the "controller" in between the ecu output and the ignition/injectors. at this point the ecu is just outputting a signal to these devices. you are modifying that output to a different signal whether it be adding or subtracting. if you are just modifying that ECU output then this should have no effect to the OBDII system at all. the ECU will still get all the correct inputs from every sensor, etc...
make sense??
On to your question: You are right - I just checked the wiring diagrams for the Emanage and it does have the ECU outputs coming into it.
Looks like it would be a great option for our cars and I'm glad my letter was in full support
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From: Detroit, MI
Originally Posted by TheNick,Sep 30 2009, 09:42 AM
On to your question: You are right - I just checked the wiring diagrams for the Emanage and it does have the ECU outputs coming into it.
Looks like it would be a great option for our cars and I'm glad my letter was in full support
Looks like it would be a great option for our cars and I'm glad my letter was in full support
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From: Northern NJ
Originally Posted by Orthonormal,Sep 30 2009, 12:38 PM
Based on that argument, the front bumper cover could be considered a part of the "air intake system" since air is drawn through that big hole in the center to feed the intake.
See the October 2008 Fastrack, page 46, Tech Bulletin #2 if you want to see what the SEB has to say on the issue.
See the October 2008 Fastrack, page 46, Tech Bulletin #2 if you want to see what the SEB has to say on the issue.