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S300 different a/f ratios at WOT (Random)

Posted: Sun Apr 21, 2013 3:33 pm
by suztoy2
Here is the story:
My car is a Honda Crx with a b20/vtec engine currently running s300 and using Smannager 2.2.4.0 .
I have always tuned the car with success and currently rated at 263whp. Car ran 11.5@119mph.
So basically my problem is that randomly the computer is adding fuel to the program without any modifications to the car nor the program. For example, I run the car and do a wot pull and the car runs super rich usually the first pull I do after starting the car (around 10-11 a/r ratio) this is using my AEM wideband. After a few minutes (either i shut the car off or even continue driving) and I do another pull and the a/f is perfect. When I check my datalogs the inj times and duty cycles are way different from one pull to another. I have checked data logs for ect enrichments and iat enrichments and all are at 0, which is fine since all my tables are at 0 since I started to troubleshoot this problem. I dont use close loop, and there's not short/long term changes shown in the datalogs also which is fine also.I cannot pinpoint were the additional fuel is coming from.
Here is my calibration file and two data logs. One showing the car running rich and another running fine. No modifications were made to the car or the program between both pulls.
Im desperate and will appreciate any help!!!

Re: S300 different a/f ratios at WOT (Random)

Posted: Mon Apr 22, 2013 9:49 am
by Spunkster
In the datalog that is running rich your TPS does not appear to be reading corectly as it never goes below 63% and appears you have completely let off the throttle and are decelerating at full vacuum.

Re: S300 different a/f ratios at WOT (Random)

Posted: Mon Apr 22, 2013 11:10 am
by suztoy2
Ive been having trouble that the throttle sometimes stays open. But, like I said my problem as you can see is on wot, on which is reading fine. Can you point me at why the inj duration is changing on the same.map??

Re: S300 different a/f ratios at WOT (Random)

Posted: Mon Apr 22, 2013 11:38 am
by Spunkster
The datalog also showed a higher throttle percentage on the rich one. I think you need to resoolve that first.

Re: S300 different a/f ratios at WOT (Random)

Posted: Mon Apr 22, 2013 3:12 pm
by suztoy2
ok...I'll calibrate the tps again. My question is, even if the tps readings are different, how can this alter the fuel the computer is inyecting if the main parameter for that is the map.
I just want to understand the computer/program.

Re: S300 different a/f ratios at WOT (Random)

Posted: Mon Apr 22, 2013 4:31 pm
by Spunkster
There are too many variables to give a precise answer over the internet. This is something that would have to be looked at on the dyno under controlled circumstances. Battery voltage calculations, IAT variations (I know you have zeroed the compensations, but at different temps the fuel will burn in different ways and at different rates.

Re: S300 different a/f ratios at WOT (Random)

Posted: Wed Apr 24, 2013 7:25 pm
by suztoy2
Well, I live in Puerto Rico. Here temperature changes maybe 15-20 degrees between night and day. Like I said, Im trying to understand the logic behind the software/computer inj calculations. If the program is set for load (map) to do the injection times, and all the corrections are at 0, what other variables there are? Its simple. On one datalog we have injection openings of 8.5ms and on other 6.5ms on wot with nothing changed. Where is the difference between these two coming from?

Unless there are some.parameters that cannot be tunned or changed and are working behind the scenes, I dont see it.
I've tuned Electromtives, Microtechs, AEM...etc...
Also this problem is happening on two cars with totaly different computers and.setups.

Re: S300 different a/f ratios at WOT (Random)

Posted: Thu Apr 25, 2013 1:57 pm
by Spunkster
Post 2 datalogs that have different AF ratios that all have the same ECT, IAT and TPS readings and I will take a look. Also include the calibration that was used.