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
Crank ISC duty cycle
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="CJK440" data-source="post: 15297420" data-attributes="member: 43980"><p>One other thing I didn't pay attention to yesterday was spark advance when transitioning from crank to idle.</p><p></p><p>It starts as a flat 8 during crank but once it fires, spark jumps to 24.5 degrees peak in about .4 seconds. It then immediately drops to 15. All of this happens within 1 second of firing. Perhaps the culprit of my RPM flare and stall at first fire?? Or perhaps this is normal. See below.</p><p></p><p>Yellow is spark adv</p><p>Blue is RPM</p><p>Purple is ISC DC</p><p>Maroon is fuel source</p><p>[ATTACH]66321[/ATTACH]</p><p></p><p>What I don't understand is the idle (cold and hot) spark relationship in advantage vs what I log. There are discrepancies. </p><p></p><p>Crank spark should be 10 for all ECT under 150. (but I logged 8)</p><p>My exit crank spark is stock at 10 for ECT under 100 (but I get the 24.5 degree flare. </p><p>Desired idle spark neutral is 63.75?? </p><p>Min idle spark is 10 (but hot idle fluctuates between 8-10)</p><p></p><p></p><p>As of this AM when cold starting the RPM flares to 1400 or so and stalls. Next attempt does the same but stays running where it goes to a decent idle. At least now I can start the car cold without fogging up the place with unburnt fuel while I pedal it for 10-15 seconds to keep it alive. But still something seems off.</p></blockquote><p></p>
[QUOTE="CJK440, post: 15297420, member: 43980"] One other thing I didn't pay attention to yesterday was spark advance when transitioning from crank to idle. It starts as a flat 8 during crank but once it fires, spark jumps to 24.5 degrees peak in about .4 seconds. It then immediately drops to 15. All of this happens within 1 second of firing. Perhaps the culprit of my RPM flare and stall at first fire?? Or perhaps this is normal. See below. Yellow is spark adv Blue is RPM Purple is ISC DC Maroon is fuel source [ATTACH]66321.vB[/ATTACH] What I don't understand is the idle (cold and hot) spark relationship in advantage vs what I log. There are discrepancies. Crank spark should be 10 for all ECT under 150. (but I logged 8) My exit crank spark is stock at 10 for ECT under 100 (but I get the 24.5 degree flare. Desired idle spark neutral is 63.75?? Min idle spark is 10 (but hot idle fluctuates between 8-10) As of this AM when cold starting the RPM flares to 1400 or so and stalls. Next attempt does the same but stays running where it goes to a decent idle. At least now I can start the car cold without fogging up the place with unburnt fuel while I pedal it for 10-15 seconds to keep it alive. But still something seems off. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
SVTPerformance's Chain of Restaurants
Tuning À la carte
Crank ISC duty cycle
Top