Fitech lean on closed throttle decell - FFCars.com : Factory Five Racing Discussion Forum
 
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post #1 of 4 (permalink) Old 07-16-2019, 07:26 PM Thread Starter
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Fitech lean on closed throttle decell

To all those who use the Fitech 600 system, I need your help. I have a slight stumble with a slight lean condition on acceleration on a smooth throttle input. The AFR at that time is about 15:1 16:1, and corrects itself quickly to 13:1
Also have noticed a exhaust pop and a leaner AFR on closed throttle decell, at around 17 to 18. Fitech dosent have the best tech support, so I'm asking here first. Other than those two issues, it's been great.

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post #2 of 4 (permalink) Old 07-16-2019, 10:38 PM
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My 400 pops a bit as well, but itís not terrible. Thereís pretty active Facebook group that may be helpful.

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post #3 of 4 (permalink) Old 07-16-2019, 11:18 PM
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Originally Posted by brian1967 View Post
Also have noticed a exhaust pop and a leaner AFR on closed throttle decell, at around 17 to 18. Fitech dosent have the best tech support, so I'm asking here first. Other than those two issues, it's been great.
On closed throttle decel, the injectors should be off, with no fuel injected at all. Doesn't get any leaner than that. There should be a tuning selection somewhere for "decel fuel cutoff" or "ver run fuel cutoff", or something like that.

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post #4 of 4 (permalink) Old 07-17-2019, 02:29 AM
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Hopefully this will help.
Before changing any of your changes always write down where you started and make sure you save your changes to the ECM before testing them.
Get you engine hot....
First check IAC steps to make sure they are between 3-10 when the engine is hot. If it’s not then read up on how that should be set.

The stumble is from the ACCEL settings. There should be several different temperatures. All of them eventually should be at the same setting. Adjust the highest temp ACCEL 10 points up and drive the car. You can keep increasing 10 until it goes away or bogs down. If it’s bogging with to much fuel then subtract 10 point until it disappears. Adjusting this up is where I went from ...very nice to wow to holy sheet....in acceleration.

The pop when taking foot off the gas is the DECCEL settings. Again there are several temperatures settings. Always start at the highest temp setting. Starting taking 10 points off the setting until the pop goes away. This is important.....the numbers can go negative...(like -20...).
These units I’ve read are setup for automatic trannies and not standards..... the DECCEL settings will fix this.
Again please make sure you save each change to the ECM before testing it.
The DECCEL is the easiest to change and I would do first.....I hate that popping when taking your foot of the gas.

Once your happy with your settings the ECM will learn from there and make changes to your set numbers.
Good luck

Mk4 complete kit, 331 Stroker, TKO600, Moser 3.55, Fitech 600

Last edited by Brewha; 07-17-2019 at 03:15 AM.
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