Its about time we had the talk... about transient throttle - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 08-12-2009, 10:46 PM   #21
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I dont have excel running on my Win7 install. can you save it as a CSV?
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Old 08-12-2009, 11:21 PM   #22
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I had to change the extension to xls to get it to attach. If you rename to csv it should work as normal.
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Old 08-13-2009, 12:03 AM   #23
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Quote:
Originally Posted by pschmidt View Post
Attachment 12973


Would somebody be so kind as to take a look at the attached and let me know where I need to focus my attention?

This is a log of stomping on the throttle at idle. Initial AFR looks ok to me, but then there's a huge lean spike half a second later. I'm attempting to crispen up throttle response as hell and toe is very laggy right now. It feels like the motor sucks air for a split second before reacting, making rev matching a guessing game.

Thanks for any input.
ok well your lean spike is about a third to a half second after the throttle jab. and then it goes monster rich just after that. pretty evident from the log...

can you post up a screencap of your enrichments? both the main page and the asynch pop-up.

ideally, you could raise the 1000 rpm asynchronous pulse by, say, 30% and it would take care of it, but I suspect it's going to go quite rich from then on. I'm guessing you have to set the duration of the TPS / MAP component to a smaller value. somewhere between 200 and 400 ms I'd imagine. Then see how smooth the AFR stays. if it's spike-free but just too rich for longer than a spike, lower the TPS/MAP components some...
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Old 08-13-2009, 09:52 AM   #24
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Here's what I'm working with so far.





Thanks for taking a look.

Last edited by pschmidt; 08-13-2009 at 10:55 AM.
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Old 08-13-2009, 11:12 AM   #25
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Try raising the TPS component up to 100 and then 200 and see what changes.

and try dropping the duration of it if it gets too rich after the initial adjustment.
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