Home
What's new
Latest activity
Authors
Store
Latest reviews
Search products
Forums
New posts
Search forums
What's new
New posts
New listings
New products
New profile posts
Latest activity
Members
Current visitors
New profile posts
Search profile posts
Log in
Register
Cart
Cart
Loading…
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Search titles only
By:
Menu
Log in
Register
Navigation
Install the app
Install
More options
Change style
Contact us
Close Menu
Forums
SVTPerformance's Chain of Restaurants
Tuning À la carte
Dies on Return to Idle
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="SecondhandSnake" data-source="post: 15733628" data-attributes="member: 116684"><p>You might try purposely increasing your ISC neutral idle air above what it should be (integrator goes negative) for your target idle speed and below. That more than helped in my initial situation, and I know a few people that do a similar thing with spark timing in megasquirt, so when it starts getting just below your target idle it forces it up, possibly even before the derivative is big enough to cause the PCM to make adjustments. It's kind of a patch for the PCM not "catching" it fast enough.</p><p></p><p>My mention of calibrating wasn't for the transfer function but for the neutral idle air table. You could in theory do it but it would take some calculations. You'd need to establish base airflow through the throttle (0% IAC DC), and subtract that from your total airflow, indexing that to IAC DC. Of course load would also impact it, but it doesn't seem to be a big factor on the 03/04 4V calibrations.</p><p></p><p>What I was referring to is it would be nice if you could set the desired idle to slowly sweep from say 650 RPM up to 1200 RPM, log the integrator the whole time and you'd be golden. But I'm not aware of a way to force that functionality, at least with SCT.</p></blockquote><p></p>
[QUOTE="SecondhandSnake, post: 15733628, member: 116684"] You might try purposely increasing your ISC neutral idle air above what it should be (integrator goes negative) for your target idle speed and below. That more than helped in my initial situation, and I know a few people that do a similar thing with spark timing in megasquirt, so when it starts getting just below your target idle it forces it up, possibly even before the derivative is big enough to cause the PCM to make adjustments. It's kind of a patch for the PCM not "catching" it fast enough. My mention of calibrating wasn't for the transfer function but for the neutral idle air table. You could in theory do it but it would take some calculations. You'd need to establish base airflow through the throttle (0% IAC DC), and subtract that from your total airflow, indexing that to IAC DC. Of course load would also impact it, but it doesn't seem to be a big factor on the 03/04 4V calibrations. What I was referring to is it would be nice if you could set the desired idle to slowly sweep from say 650 RPM up to 1200 RPM, log the integrator the whole time and you'd be golden. But I'm not aware of a way to force that functionality, at least with SCT. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
SVTPerformance's Chain of Restaurants
Tuning À la carte
Dies on Return to Idle
Top