Spark Plugs with Two-Step

Bobby Fazio · 02-01-2017, 12:16 PM

Ed I have the sensor in a primary so the closed loop would be somewhat accurate around the pits. My tune going downtrack has a good reading and I have a sensor in the collector for that. I think a great new option for any EFI company to set themselves apart from the competition (hint hint) would be to use multiple widebands at different RPM or Loads. For example, it would be cool if under 4500 RPM or certain load %, my closed loop is controlled by my primary tube's o2 sensor and then when I transition to a full throttle RPM, above 5000RPM or over 80% load let's say, it switches its closed loop decision making to the o2 sensor in the collector.

Ed Wright · 02-01-2017, 03:36 PM

Bobby, after I put the long collector extension on mine, and did the part throttle tuning, I pulled it back off, and put it back in Open Loop there. I see no need for further corrections there. My spark plugs are always white, with the little tan ring around the bottom.

Bobby Fazio · 02-01-2017, 07:37 PM

Gotcha. Yes I guess I could try the long extension to get those areas tuned. The fast xfi 2.0 automatically goes into open loop when two step is active. Also, before I forget, how do you feel about iridium/platinum/copper plugs? Has anyone tried Denso plugs in their race engine yet?

Ed Wright · 02-01-2017, 07:59 PM

If your not experiencing misfireing, I doubt you will lower your ET with any of those.
I just use non-platinum Autolite plugs. Gapped @ .050" in mine. I have found no ET improvement in different types of metal in spark plugs. Correct heat range (one step colder than factory is what I use in mine) and no misfires is as quick as anything I have stumbled onto. Somebody smarter than me may have found something different.
When I had my shop, all I did was tune ups & drivability diagnostics, and AC service. Replaced a ton of AC plugs with failed resistors (looked just like bad a plug wire on the 'scope), and Champions with a loose center electrodes. Several NGKs with high RPM misfires. Not as many as faulty resister AC plugs. They may have cured those things now, that was before 2010. Never encountered a defective Autolite. Started using those in everything. NAPA parts store guys called me Autolite Ed. LOL
Did not like to have come backs. Bad for business.

Bobby Fazio · 02-02-2017, 08:54 AM

haha got it, thanks as always Ed!

02-01-2017, 12:16 PM	#1
Bobby Fazio VIP Member Join Date: Nov 2009 Location: Egg Harbor Township, NJ Posts: 1,468 Likes: 1,448 Liked 4,365 Times in 501 Posts	Re: Spark Plugs with Two-Step Ed I have the sensor in a primary so the closed loop would be somewhat accurate around the pits. My tune going downtrack has a good reading and I have a sensor in the collector for that. I think a great new option for any EFI company to set themselves apart from the competition (hint hint) would be to use multiple widebands at different RPM or Loads. For example, it would be cool if under 4500 RPM or certain load %, my closed loop is controlled by my primary tube's o2 sensor and then when I transition to a full throttle RPM, above 5000RPM or over 80% load let's say, it switches its closed loop decision making to the o2 sensor in the collector. __________________ '65 Mustang SS/L & L/SA DriverInterviews.com \| App.DragInsights.com

02-01-2017, 03:36 PM	#2
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: Spark Plugs with Two-Step Bobby, after I put the long collector extension on mine, and did the part throttle tuning, I pulled it back off, and put it back in Open Loop there. I see no need for further corrections there. My spark plugs are always white, with the little tan ring around the bottom. __________________ Ed Wright 4156 SS/JA

02-01-2017, 07:37 PM	#3
Bobby Fazio VIP Member Join Date: Nov 2009 Location: Egg Harbor Township, NJ Posts: 1,468 Likes: 1,448 Liked 4,365 Times in 501 Posts	Re: Spark Plugs with Two-Step Gotcha. Yes I guess I could try the long extension to get those areas tuned. The fast xfi 2.0 automatically goes into open loop when two step is active. Also, before I forget, how do you feel about iridium/platinum/copper plugs? Has anyone tried Denso plugs in their race engine yet? __________________ '65 Mustang SS/L & L/SA DriverInterviews.com \| App.DragInsights.com

02-01-2017, 07:59 PM	#4
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: Spark Plugs with Two-Step If your not experiencing misfireing, I doubt you will lower your ET with any of those. I just use non-platinum Autolite plugs. Gapped @ .050" in mine. I have found no ET improvement in different types of metal in spark plugs. Correct heat range (one step colder than factory is what I use in mine) and no misfires is as quick as anything I have stumbled onto. Somebody smarter than me may have found something different. When I had my shop, all I did was tune ups & drivability diagnostics, and AC service. Replaced a ton of AC plugs with failed resistors (looked just like bad a plug wire on the 'scope), and Champions with a loose center electrodes. Several NGKs with high RPM misfires. Not as many as faulty resister AC plugs. They may have cured those things now, that was before 2010. Never encountered a defective Autolite. Started using those in everything. NAPA parts store guys called me Autolite Ed. LOL Did not like to have come backs. Bad for business. __________________ Ed Wright 4156 SS/JA Last edited by Ed Wright; 02-01-2017 at 08:03 PM.

02-02-2017, 08:54 AM	#5
Bobby Fazio VIP Member Join Date: Nov 2009 Location: Egg Harbor Township, NJ Posts: 1,468 Likes: 1,448 Liked 4,365 Times in 501 Posts	Re: Spark Plugs with Two-Step haha got it, thanks as always Ed! __________________ '65 Mustang SS/L & L/SA DriverInterviews.com \| App.DragInsights.com

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