Quick question about duty cycle
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What R U thinking self?
Joined: Mar 2002
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From: Stockton, CA
Quick question about duty cycle
What is the max duty cycle the stock S4 ECU will attmept to run? I was reading about my reprogramed ECU and they say it is setup to run %83 duty cycle by 18 PSI max. I am trying to understand what the hell they mean by that. Will the stock ECU not go over a certain duty cycle even if the car is starving for fuel?
Also does an S-AFC raise the duty cycle when you raise the percentage? I assume it would have to right?
Thanks,
Robert
Also does an S-AFC raise the duty cycle when you raise the percentage? I assume it would have to right?
Thanks,
Robert
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From: n
Re: Quick question about duty cycle
Originally posted by Rpeck
What is the max duty cycle the stock S4 ECU will attmept to run? I was reading about my reprogramed ECU and they say it is setup to run %83 duty cycle by 18 PSI max. I am trying to understand what the hell they mean by that. Will the stock ECU not go over a certain duty cycle even if the car is starving for fuel?
What is the max duty cycle the stock S4 ECU will attmept to run? I was reading about my reprogramed ECU and they say it is setup to run %83 duty cycle by 18 PSI max. I am trying to understand what the hell they mean by that. Will the stock ECU not go over a certain duty cycle even if the car is starving for fuel?
Also does an S-AFC raise the duty cycle when you raise the percentage? I assume it would have to right?
-Ted
Thread Starter
What R U thinking self?
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From: Stockton, CA
Re: Re: Quick question about duty cycle
Originally posted by RETed
Who told you that???
-Ted
Who told you that???
-Ted
here is one of the paragraphs from the mail
"robert, whats up. well, your injectors have been set up to run at about 83%
duty cycle, at 18 psi boost. hope this info helps.
sergio, ELP"
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From: n
Re: Re: Re: Quick question about duty cycle
Originally posted by Rpeck
Ted, i was looking back at sme old E-mails between me, and E.L. Prototypes (the designer of my after market ECU chip) trying to figure out what all was programed.
here is one of the paragraphs from the mail
"robert, whats up. well, your injectors have been set up to run at about 83%
duty cycle, at 18 psi boost. hope this info helps.
sergio, ELP"
Ted, i was looking back at sme old E-mails between me, and E.L. Prototypes (the designer of my after market ECU chip) trying to figure out what all was programed.
here is one of the paragraphs from the mail
"robert, whats up. well, your injectors have been set up to run at about 83%
duty cycle, at 18 psi boost. hope this info helps.
sergio, ELP"
-Ted
Thread Starter
What R U thinking self?
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From: Stockton, CA
Re: Re: Re: Re: Quick question about duty cycle
Originally posted by RETed
I think those guy are full of ****...
-Ted
I think those guy are full of ****...
-Ted
I'm a boost creep...
Joined: Jan 2002
Posts: 15,608
Likes: 8
From: Auckland, New Zealand
ECU's (and fuel controllers) do not work on duty cycle! They calculate an opening time per cycle for the injector based on all of the inputs from the sensors. Duty cycle is simply a number that you calculate or measure to see how much of the injector's capacity is being used under particular circumstances. If the injectors are undersized for the engine's requirements, the ECU can and will calculate a pulsewidth equal to engine cycle duration, meaning 100% duty cycle.
What you posted from those guys makes no sense whatsoever.
What you posted from those guys makes no sense whatsoever.
Thread Starter
What R U thinking self?
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From: Stockton, CA
Okay I sent ELP another E-mail and asked what the upgrade parameters of my ECU were, here is the reply;
and look at this, a CorkSport ELP ECU upgrade?
3rd item down.
http://www.corksport.com/main.php3?p...hp3?cat=273174
-Robert
We are still trying to recover our data files from a virus attack; therefore,
we cannot access your records at this time.
To help you we can offer the following information:
Standard Parameters
1) Fuel cut removed
2) Two timing maps modified - leading and trailing.
3) Injector duty cycles modified - primary and secondary.
4) Hot maps locked in to avoid detonation.
5) 16 - 18 psi on stock turbo - stock upgrade.
6) 16 psi on T-3 or T3/T4 style - turbo upgrade.
7) All of the above when larger injectors are used - injector/turbo upgrade.
Numbers 6 and 7 are set as additional changes when the customer specifies an
upgraded system. If the car was stock at the time of the upgrade numbers 1,
2, 3, 4, and 5 apply.
Hope this helps.
Regards,
ELP
we cannot access your records at this time.
To help you we can offer the following information:
Standard Parameters
1) Fuel cut removed
2) Two timing maps modified - leading and trailing.
3) Injector duty cycles modified - primary and secondary.
4) Hot maps locked in to avoid detonation.
5) 16 - 18 psi on stock turbo - stock upgrade.
6) 16 psi on T-3 or T3/T4 style - turbo upgrade.
7) All of the above when larger injectors are used - injector/turbo upgrade.
Numbers 6 and 7 are set as additional changes when the customer specifies an
upgraded system. If the car was stock at the time of the upgrade numbers 1,
2, 3, 4, and 5 apply.
Hope this helps.
Regards,
ELP
and look at this, a CorkSport ELP ECU upgrade?
3rd item down.
http://www.corksport.com/main.php3?p...hp3?cat=273174
-Robert
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Thread Starter
What R U thinking self?
Joined: Mar 2002
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From: Stockton, CA
Originally posted by $150FC
have you already given these people your money?
have you already given these people your money?
I'm a boost creep...
Joined: Jan 2002
Posts: 15,608
Likes: 8
From: Auckland, New Zealand
Originally posted by Rpeck
3) Injector duty cycles modified - primary and secondary.
3) Injector duty cycles modified - primary and secondary.
Duty cycle is injector pulsewidth divided by engine cycle duration, so it's constantly varying all over the place. It's not a parameter used by the ECU.
4) Hot maps locked in to avoid detonation.
Thats what I'm asking you 
Rotary Enthusiast
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From: Darwin, NT, Australia
The only thing in the ECU that is dependant on boost/vacume is timming yeah?? Possibly the 15+ PSI maps are just not retarded anymore than the 15Psi map is.
And the "hot maps locked in to avoid detonation" sounds to me like the hot air temp timming maps have been locked in (more retarded) to avoid detonation???
I dont actually know thats just what it seems like to me.
And the "hot maps locked in to avoid detonation" sounds to me like the hot air temp timming maps have been locked in (more retarded) to avoid detonation???
I dont actually know thats just what it seems like to me.
Thread Starter
What R U thinking self?
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From: Stockton, CA
Originally posted by RETed
I would like to know how the ECU can be mapped up past 15psi, when the stock boost sensor maxes out at 15psi - try and ask them that question!
-Ted
I would like to know how the ECU can be mapped up past 15psi, when the stock boost sensor maxes out at 15psi - try and ask them that question!
-Ted
I will send out a mail and ask them that, and I will tell them Ted wants to know
Keep ya posted.
-Robert
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