Help me understand the wall wetting function and it’s adjustments

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mx5newbie
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Joined: Sun Mar 20, 2022 4:14 am

Help me understand the wall wetting function and it’s adjustments

Post by mx5newbie »

Trying to work out a small issue of when I attempt to revmatch during downshifts. It seems at slower speeds, less rpm, i blip the throttle and it goes lean, but at higher speeds it appears to rev just fine. From all the reading I’ve done here, it appears that the wall wetting adjustment seems to be the proper solution. Please help me under how this works. Thanks in advance.
1990 Miata w/Mamba Td04-13T turbo, FIC 775cc injectors
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AndreyB
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Re: Help me understand the wall wetting function and it’s adjustments

Post by AndreyB »

I have no wisdom to answer but sometimes a URL of your current tune and a URL of your log showing the issue is helpful.

https://rusefi.com/online for both
Very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions

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007adr
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Re: Help me understand the wall wetting function and it’s adjustments

Post by 007adr »

I’m my limited experience, I’ve allways left wall wetting alone and concentrated on acceleration enrichment you will find with logs you are using more throttle at lower rpm’s to to match rpm compared to higher rpm, a lean spike is normal to see when you stab the throttle, you just add fuel to acceleration enrichment untill it feels right


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mx5newbie
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Joined: Sun Mar 20, 2022 4:14 am

Re: Help me understand the wall wetting function and it’s adjustments

Post by mx5newbie »

Ok, I've finally got logged in using my laptop. I'm uploading my tune and the last log. I've been playing with the numbers in AE, but I cant say I truly understand how the table actually works in reference to throttle position. I'm hoping that will be explained so I'll better understand. Fuel needs some smoothing in some places, but I'll get back to that later. Other than this small issue, car runs and drives great. Thanks in advance.

https://rusefi.com/online/view.php?msq=1185

https://rusefi.com/online/view.php?log=998
Last edited by mx5newbie on Wed Aug 24, 2022 7:26 pm, edited 1 time in total.
1990 Miata w/Mamba Td04-13T turbo, FIC 775cc injectors
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AndreyB
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Re: Help me understand the wall wetting function and it’s adjustments

Post by AndreyB »

Very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions

Always looking for C/C++/Java/PHP developers! Please help us see https://rusefi.com/s/howtocontribute
BeerMoneyMotorsports
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Re: Help me understand the wall wetting function and it’s adjustments

Post by BeerMoneyMotorsports »

Hey AK, what injectors are you running? Your VE numbers are wack.
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mx5newbie
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Re: Help me understand the wall wetting function and it’s adjustments

Post by mx5newbie »

mx5newbie wrote:
Wed Aug 24, 2022 7:08 pm
Ok, I've finally got logged in using my laptop. I'm uploading my tune and the last log. I've been playing with the numbers in AE, but I cant say I truly understand how the table actually works in reference to throttle position. I'm hoping that will be explained so I'll better understand. Fuel needs some smoothing in some places, but I'll get back to that later. Other than this small issue, car runs and drives great. I’m using FIC 775cc injectors. Thanks in advance.

https://rusefi.com/online/view.php?msq=1185

https://rusefi.com/online/view.php?log=998
1990 Miata w/Mamba Td04-13T turbo, FIC 775cc injectors
BeerMoneyMotorsports
Posts: 151
Joined: Thu Jan 14, 2021 10:16 pm

Re: Help me understand the wall wetting function and it’s adjustments

Post by BeerMoneyMotorsports »

LOL, sorry about that. Below is the injector data for the FIC injectors. try these dead times. you can follow the basic curve for any outside of these.

8---- 2.34
10--- 1.57
12--- 1.18
14--- 0.91
16--- .72
18--- .53

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mx5newbie
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Re: Help me understand the wall wetting function and it’s adjustments

Post by mx5newbie »

Will do that now.
1990 Miata w/Mamba Td04-13T turbo, FIC 775cc injectors
mx5newbie
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Joined: Sun Mar 20, 2022 4:14 am

Re: Help me understand the wall wetting function and it’s adjustments

Post by mx5newbie »

Thanks to BeerMoneyMotorsports we made some changes to dead time settings and made VE changes to get the AFR back to normal. Now the car seems to run even smoother than before.

New dead time and Idle VE:
8B3C4DE1-1839-4EEA-9E60-5E215AD5F15C.jpeg
8B3C4DE1-1839-4EEA-9E60-5E215AD5F15C.jpeg (4.44 MiB) Viewed 5411 times
1990 Miata w/Mamba Td04-13T turbo, FIC 775cc injectors
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