DOHC - 2.3L Duratec / Mazda L Engines Discussions and Topics specific to the Duratec 4 cylinder engines

2.3L performance mods

  #51  
Old 08-28-2018
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Good advice...Thanks very muchI'll stick to the simple cheap things like a K&N air filter replacement
 
  #52  
Old 08-29-2018
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Have had a MSDS header on my DT2.3 for 20k miles, never had a warning light show up. Could be some owners are removing one or both of the two cats. I upgraded both cats, added a Flowmaster super 50 and a Magnaflow 4L tail pipe. Prior to all that the Henry would never upshift on a grade, now he does
 

Last edited by grunt98444; 08-29-2018 at 06:01 PM.
  #53  
Old 08-29-2018
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You may be right with people messing with the cats. The downstream O2 sensor while having ZERO to do with the way the engine runs is what the dumbass California emissions system uses to determine if the cats are functioning, if it shows more flow than normal it will set of a CEL. I build cat bypass systems for rear engine cars and always have to explain to customers there is no way to avoid the CEL but it wont effect how the engine operates.

Now if you screw around with the upstream O2 sensor not only will you get a CEL but your engine will run like a pile of garbage until you get it tuned to the new specs since the computer actually uses that sensor to set the injector pulse width. I see this issue happen when people install long tube headers that move the upstream O2 sensor drastically down stream of its original location.

My "toys" all use carbs so no computer tuning involved, all I ever need to do is adjust the mechanical timing and jet the carb when I do something like change headers or a cam. Anytime you screw with an EFI system to the slightest amount your not going to get the full potential of any mod without tuning the computer software which is the modern equivalent of re-jetting a carb. The computer will compensate to some degree but it will consider that compensation to be an error and bam... CEL.

Im rambling... Long day at work and way too many margaritas
​​​​​
 

Last edited by Apexkeeper; 08-29-2018 at 06:33 PM.
  #54  
Old 08-29-2018
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Since this is a duratec performance thread I should note... Best mod I ever did to mine was to switch to 90 or 93 octane, depends whats available but if your hard and agressive on a D-tec they want that octane bump. RonD explained the whole knock sensor thing to me and to bastardize his explanation the duratec has 9.7:1 compression which is on the very very edge of needing a premium fuel so ford uses a knock sensor to retard the timing if it does knock. Retarding the timing saves the engine but kills performance. Run one grade higher in fuel and you keep the knock sensor from ever needing to screw you out of any performance. I ran my scanner in mode 6 on a long trip recently hauling a bunch of engine cores. With 93 octane it never adjusted the timing, on 87 the knock sensor pulled the timing out 4 degrees. I dunno what 4 degrees of timing really means in terms of power but personally I'd rather have the knock sensor just go eff itself and just pay the extra quarter a gallon for fuel that doesn't need it.
 
  #55  
Old 08-29-2018
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I heard about the MSDS header. Martin Schneider, who makes them, said that the header installs before the O2 sensor but "You will need to cancel the CEL, which will activate with (any brand) racing exhaust header". I am really new to all this and would really like to do the right thing without causing further problems. I hear you, Grunt, when you say you've had yours for 20 K miles with no problems...it is good to have experience from someone who has used them.....Perhaps Martin was referring to racing application which removes the Cat. It also makes sense to use high octane fuel as Apexkeeper advises.
 
  #56  
Old 08-29-2018
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What sucks about CA emissions is that it seems to get on a lot of trucks regardless of where you live. Henry was bought new in WA state but has CA emissions controls, wonder if a lot of trucks get it just because it's cheaper to do them all that way than not
 
  #57  
Old 08-29-2018
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Martin Schneider (MSDS) also asserts that with his header there will be "+10 to 12% increase in bhp over the stock restrictive manifold."
He also said that the header he supplies does not come with gasket or hardware. Grunt98444, what did you use for gasket and did you use hardware from the stock manifold?

Thanks again

DW
 
  #58  
Old 08-29-2018
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Used a new FelPro gasket and reused the hardware. Martin sure knows how to weld up a header, it fits like Ford put it there. I splurged for the Jet hot coating for cooler under hood temps not realizing the it would also allow the cats to get up to temp a lot quicker. Even in colder weather it goes into closed loop operation much faster saving a few mpg's in the process
 

Last edited by grunt98444; 08-29-2018 at 09:24 PM.
  #59  
Old 08-29-2018
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Originally Posted by grunt98444 View Post
What sucks about CA emissions is that it seems to get on a lot of trucks regardless of where you live. Henry was bought new in WA state but has CA emissions controls, wonder if a lot of trucks get it just because it's cheaper to do them all that way than not
I live in PA, all vehicles here are CA certified, never found one that wasn't. I just got my aunt a fiesta 8 months ago and last week she called me saying she got a letter in the mail from ford saying something was wrong. It was a notice over a California emissions item that caused them to offer an extended warranty on the evap system for an extra 10k miles... Didn't effect pa regs but since it was a California passed car they must warranty it.
 
  #60  
Old 08-29-2018
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Ford does list two different pullies for the alt, a larger one and the other smaller, the trick is to find why and which one you have.
 
  #61  
Old 09-24-2018
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Originally Posted by grunt98444 View Post
Have had a MSDS header on my DT2.3 for 20k miles, never had a warning light show up. Could be some owners are removing one or both of the two cats. I upgraded both cats, added a Flowmaster super 50 and a Magnaflow 4L tail pipe. Prior to all that the Henry would never upshift on a grade, now he does
"I upgraded both cats, added a Flowmaster super 50 and a Magnaflow 4L tail pipe".
Hi Grunt98444. I am about to order my MSDS header for my 2.3L 2011 5 speed manual shift trans. Thanks for the advice on the gasket.
For your Flowmaster super 50...what diameter in and out did you use? and what diameter is your Magnaflow tailpipe?
I see that the before cat pipes and the after cat pipes are greater diameter than the in/out diameter of the cats.

Thanks,

DW
 
  #62  
Old 09-25-2018
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:I had the work done (my apology if it seemed I did it from home) so don't know the inlet size (2/12?) or part number they used for muffler. Do know the shop had to add pipe between the cat and muffler to make it work..
Magnaflow no longer just sells the pipe (maybe contact them to order).
Did fine a Walker Uniflow pipe from Rock Auto that looks mandrel bent. .
https://www.rockauto.com/en/catalog/ford,2011,ranger,4.0l+v6,1446675,exhaust+&+emissio n,tail+pipe,10023
 

Last edited by grunt98444; 09-25-2018 at 03:36 PM.
  #63  
Old 11-14-2018
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MSDS header: awesome!

So, I got my MSDS header from Martin Schneider...had it ceramic coated. I got a muffler shop in town to install it and it fit perfectly like it was made to... In 3 weeks I've had no CEL issues.
I dropped in a drop in K&H air filter at your suggestion and a​​​​​t Apexkeeper's suggestion I have been running with 94 Octane fuel.
I have been totally thrilled with the results...have noticed a significant increase in acceleration especially at ~3200 rpms...seems almost like a turbo effect between 3200 to 4200 rpms.
Next on the project list is to modify the after-cat equipment: 2 1/4" pipes, Magnaflow or Flowmaster muffler...
oh, and getting ready for winter, I replaced the open differential with a limited slip differential...
 
  #64  
Old 11-15-2018
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It's amazing what two changes can do for our trucks
Regarding exhaust the Flowmaster Super 50 is the quietest muffler they make in our sizes. That being said it does reveal an exhaust drone that you may or may not like. Have been thinking of adding a flex joint and their resonator to help with that.
Since your already running 94 octane you might think about the Jet Performance chip and airflow meter. Have the set and it really adds to the "turbo effect" you described.
I think you will find the limited slip differential helpful not only with winter weather but also in getting the new found grunt to the pavement
 

Last edited by grunt98444; 11-15-2018 at 12:02 PM.
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