CAT over temp bug

K-Series Programmable ECU installation questions / support issues
f1racr
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CAT over temp bug

Post by f1racr »

Hi guys,

I've been having an issue with my car on the dyno and I'm hoping that I might be able to request some action if there isn't a fix already.

While on the dyno, we completed 3-4 runs with no changes. For the first 3 runs the mixture was a repeatable and constant 0.81-0.82 Lambda.

On the 4th run, with no changes to the tune, the mixture dropped to 0.75-0.76 lambda for the last 1000 rpm of the run. I can get the same result on the road if I do back-to-back acceleration runs.

I believe that Hondata have confirmed this as possible activity of the CAT protection mode, but it's very frustrating whilst racing and would appreciate it if you could give me some kind of response as to what can be done to help the issue.

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Hondata
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Post by Hondata »

Yes, that would be cat protection. I'll add it to the development list.
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The Spectacle
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Post by The Spectacle »

Never heard of cat protection. Care to elaborate Hondata?

f1racr
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Post by f1racr »

Please excuse me the more knowledgable amoung you, but I'll attempt to give a rough understanding as I see it.

When the exhaust temp gets to a certain level, the ECU assumes that these high temperatures would damage the catalytic converter in the car and so it will "tip in" extra fuel to help cool the exhaust temp and in turn cool the catalytic converter.

Of course this is great for the cat, but when you don't run a cat as I don't all it does it loses power and causes the tune to move from where it's expected to be.

Thanks for letting me know that you've added it to the development list........ good to know it's likely to get sorted sometime in the future.

f1racr
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Post by f1racr »

Do you guys have an ETA for when you expect this to be resolved ?

I know there will be plenty of other issues before it, but I'm just trying to get an idea so I can keep a look out for a fix.

Thanks

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Hondata
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Post by Hondata »

No ETA, but I hope to make a KPro release this month.
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f1racr
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Post by f1racr »

OK thanks for that....... I'll keep an eye out for it.

Floppie
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Post by Floppie »

I'm just curious here - any idea how the system determines when to engage/disengage cat protection mode? You mentioned it does it based on EGT, but I thought these cars didn't have EGT sensors.

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Hondata
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Post by Hondata »

It calculates the cat temperature based on engine load over time.
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impc
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Post by impc »

waiting also this feature ;)!

f1racr
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Post by f1racr »

Any news on fixing this feature guys ???

It's been a fair while now, but haven't heard anything and the back of my car is regularly getting covered in waaaaaaay too much unburnt fuel because of this issue and being a supercharged car we don't want to take any risks tuning that fuel out to fix that issue and then have it running too lean at other times.....

Please Please Please........ can you fix it for us ?

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Hondata
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Post by Hondata »

Jan 2011 - V1.1.4.5

http://www.hondata.com/forum/viewtopic.php?t=12189

WOT Compensation
Access to these tables has been added for improved air/fuel consistency for race vehicles without catalytic converters.
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f1racr
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Post by f1racr »

Awesome...........

Sorry I did skim through the 1.1.4.5 notes, but must have missed that !!

Thanks so much :)

taitcw
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Re: CAT over temp bug

Post by taitcw »

Hondata: Once ECU gets into "WOT CAT Protection Mode", how would ECU get out of that?

Would switched off the engine, and restarting do the trick?

Any idea?

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Re: CAT over temp bug

Post by Hondata »

Probably when the ECU calculates that the cat temperature has dropped - basically when the engine load is reduced for a certain time period.
Hondata

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