S300v3 injector duty cycle drop out

s300 and SManager software questions & answers
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Lmayoral2191
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Joined: Sun Feb 10, 2019 10:39 pm

S300v3 injector duty cycle drop out

Post by Lmayoral2191 »

I’ve had the Hondata s300 installed on my car for over 3years and have had no problems until now, just recently I’ve been having injector duty cycle drop out under WOT. Right at 4K rpms, right around 55% duty cycle, it’ll drop to 12% then pick up to 25% then back down then back up. Car recently started having this issue, injectors have been in the car for about 1yr 550cc grams.

My question is what can cause this issue, for the duty cycle to be dropping out? Fuel pressure? Fuel regulator? Bad injectors? Or electrical issue? Any sort of guidance would be great, thanks!
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Spunkster
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Re: S300v3 injector duty cycle drop out

Post by Spunkster »

You need to post the calibration as well ass a datalog showing the issue.
Lmayoral2191
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Re: S300v3 injector duty cycle drop out

Post by Lmayoral2191 »

Here is the info
Attachments
f23 data log injector drop out.s3d
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f23 injector drop out.skl
(50.78 KiB) Downloaded 124 times
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Spunkster
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Re: S300v3 injector duty cycle drop out

Post by Spunkster »

Are you using the Hondata injector driver and secondary injectors?
Lmayoral2191
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Re: S300v3 injector duty cycle drop out

Post by Lmayoral2191 »

I have just changed the injector CC, this problem just started occurring. If I did not install it in a driver wouldn’t I have this problem from the beginning?
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Spunkster
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Re: S300v3 injector duty cycle drop out

Post by Spunkster »

YOu have secondary injectors tuned on an it will only work with the Hondata Injector Driver.
Lmayoral2191
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Re: S300v3 injector duty cycle drop out

Post by Lmayoral2191 »

How do I correct this issue?
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Spunkster
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Re: S300v3 injector duty cycle drop out

Post by Spunkster »

If you do not have secondary injectors with the injector driver then disable it.
Lmayoral2191
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Re: S300v3 injector duty cycle drop out

Post by Lmayoral2191 »

I must of hit this button by accident or something cause I don’t remember engaging secondary injectors. I’ll take a look at my fuel injector settings and see if I see this second injectors disactivation
Lmayoral2191
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Re: S300v3 injector duty cycle drop out

Post by Lmayoral2191 »

Thanks for the help!!!! That fixed my issue!
reasonabledoubt2126
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Joined: Fri Oct 29, 2021 11:56 am

Re: S300v3 injector duty cycle drop out

Post by reasonabledoubt2126 »

I'm having the same issue with my car being jerky. I have read various post regarding this problem. My issue is the worst in the morning when it is cold outside (50 degrees or below) and the car is still warming up. Once the car gets warm the problem is still there but not as bad. Looking at the data the injector duration surges while keeping the same tps% and vehicle speed.

The problem can be seen starting at 3 mins to 5 mins. However the problem is persistent throughout the whole datalog.

I think my solution is on the TPS tab and I should lower the Throttle percentage to .5% from .6% and to lower the Overrun Fuel Cutoff (TPS) delay to 250 or 200 ms.

Before I did that I wanted to get some feedback from anyone else who knows about this issue.

Car was tuned by a professional tuner. the only changes that have been made to the car since tune is headers, exhaust, and clutch/flywheel.

Calibration and datalog attached.

2002 Honda Accord
H22 Euro R w/ P28 ECU S300
AEM V2 cold air intake
HighEnd Tri Y long tube V2 headers
Test pipe
Apexi WS2 catback
12lb flywheel
Attachments
Jason tuner-nashville, TN 8-2-19.skl
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11-18-21 morning drive.zip
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TTR
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Re: S300v3 injector duty cycle drop out

Post by TTR »

There's a few things that you need to change. You need to set the TPS min/max. They are set to the defaults right now. The closed loop rate of change is default which doesn't work that great. You should add the 10% fuel trim to the fuel tables and set that trim to zero. I usually use .1% and 300ms. I'd also disable the alternator control in Misc. I never enable it on any car due to the potential of headlights dimming and other weird electrical gremlins.
reasonabledoubt2126
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Re: S300v3 injector duty cycle drop out

Post by reasonabledoubt2126 »

Thank you TTR.

I have made all the changes you suggested listed below:

1) Add the 10% fuel trim to the fuel tables and set that trim to zero.
2) Set Overrun Fuel Cutoff(MAP) throttle .1% and delay 300ms.
3) Disabled the alternator control in Misc.

I have questions about the other edits to the calibration.

When setting the TPS min/max. That would require a voltmeter and make sure that when the throttle body is closed it reads .5V and when its fully open 5V? If its off then for example at closed it read .7, I would then set the min to -0.2? and the same for the max?

The closed loop rate of change, I'm a complete newb on this change. I found these edits in the closed loop tab at the bottom in the section rate of change.

Is this a change the values by 5% or 10% and see what happens. Generally what happens when you changes these values up vs. down? What is the expected behavior one direction vs the other?

The values being changed are Percent of fuel Per second?
TTR
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Re: S300v3 injector duty cycle drop out

Post by TTR »

Ignition on, press f10 to connect to ecu. In the TPS tab, with your foot off the throttle press read min. Pedal to the floor press read max. This sets the TPS in the software if the TPS isn't set exactly perfect as most are riveted to the throttle body. Set the rate of change to this.

5-5-4-3
99-99-99-99
99-99-99-99
reasonabledoubt2126
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Re: S300v3 injector duty cycle drop out

Post by reasonabledoubt2126 »

Thank you again TTR.

I'm adding you to the friends list. I don't feel like thank you is enough. You saved me money and got my car running way better, both things car guys love.

Thank you!

After the edits you recommended I drove my car 3.5 hours home to Ohio for Thanksgiving and it felt good, however I still had a slight jerk at partial throttle. After adjusting the TPS tab using the method you recommended.

Ignition at (on position) and foot off throttle hit read and got minimum % reading and foot all the way down for max %.

This took care of the light surge at partial throttle.
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