Too lean in open driving

FlashPro questions & answers specific to the FN2 European Civic Type R
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Itsuki
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Too lean in open driving

Post by Itsuki » Sun Jun 05, 2011 2:19 am

Hi,

I´m having a issue when the car goes in open loop. It´s goes too lean. In closed loop it´s close to 14.7 but when it goes to open, suddenly goes lean.

I added fuel step by step but doesn´t goes richer. Even with big values, but always remains the same.

I´m thinking that the fuel tables aren´t the fault.

The injectors are 750cc from RC. I changed in the setup. The fuel pump it´s a Walbro, but I didn´t change the fuel pressure.

The calibration I used to start tunning was the base calibration for MAP tunning for 750cc injectors. What could be wrong?

The setup it´s a 3" custom CAI, Rotrex SC, Toda HE, and 2.5"Custom Exhaust.

I´ve attached a datalog to explain what I´m saying.

Example: In the 2:28 You could see that the injector time doesn´t goes higher in Open Loop, but in the tables has a value of 11.000 aprox (too high!!).

Thanks.
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CustomCAI5.fpdl
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Spunkster
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Re: Too lean in open driving

Post by Spunkster » Mon Jun 06, 2011 11:55 am

Without the calibration it is impossible to see what might be happening.

Itsuki
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Re: Too lean in open driving

Post by Itsuki » Fri Jun 10, 2011 5:21 am

Sorry, I forgot added the cal.

I started with the inital cal for 750cc map calibration that cames in the software. As in open loop was lean, I added fuel proportionally but was all the same result. At last, I increased the fuel to wacky values if anything changed.

I attach the last cal.

Regards.
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Spunkster
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Re: Too lean in open driving

Post by Spunkster » Fri Jun 10, 2011 10:10 am

Has this been tuned on the dyno?

Itsuki
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Re: Too lean in open driving

Post by Itsuki » Sat Jun 11, 2011 12:58 am

No, in a closed road to adjust the fuel.

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Spunkster
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Re: Too lean in open driving

Post by Spunkster » Mon Jun 13, 2011 9:28 am

I would start by getting this properly tuned on the dyno.

Itsuki
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Re: Too lean in open driving

Post by Itsuki » Mon Jun 13, 2011 11:54 pm

Yes, I will go to the dyno for sure. But why that behaviour in open loop?

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Hondata
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Re: Too lean in open driving

Post by Hondata » Tue Jun 14, 2011 8:00 am

Have you relocated the MAP sensor so that it can see boost?

Fuel trims of +33% are a sign that you need to tune before you drive the vehicle any more.
Hondata

Itsuki
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Re: Too lean in open driving

Post by Itsuki » Wed Jun 15, 2011 1:37 am

Yes, the Hondata 4 BAR MAP sensor it´s located at the plenum chamber after the SC. I added a boost gauge to ensure that the MAP reads ok (and so it does). Also I supressed the MAF sensor and put the IAT after the SC and IC too.

If you see the datalog, it´s mandatory to add fuel with that short trims values and the behaviour in Open Loop. But if you look the calibration that I uploaded, doesn´t seems the fuel values so high?

I think I´m missing the point. If I change the value of the injectors to 750cc, I used to think that the values of the fuel just rescaled itself to the new size. Or must be increased proportionally to the resize of the injector?

Thanks for the help.

civicRSA
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Re: Too lean in open driving

Post by civicRSA » Fri Jul 15, 2011 1:30 pm

That calibration is not good for a rotrex supercharger. With just a quick glimpse at it the injector latencies are off. Load indexes are not correct for a rotrex supercharger and fuel values are too low.

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