How rich it too rich?
Jun 3, 2010, 11:13 AM
#1
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How rich it too rich?
First off I'm sorry but I have no idea how to post up data logs but I'll be very specific. Starting at 3843 rpm, 226 load I am getting 2 counts of knock. Knock persists to 5093 rpm at 216 load, at least one count but mostly two. Timing is 3 to 4 degrees during the entire knock so I don't suspect too much timing. AFR is 11 - 11.2 the whole way which I know is too rich(12.5 during spool up mid eleven during peak tapering to 11 at red line, right?) but could this be causing the knock? Mods are in the sig, 91 octane, 5800 ft. elevation at 21 - 21.7 psi. I know the fuel is crap but it is all I can get on a daily basis. Any help, input or suggestions would be great, thanks guys.
Jun 3, 2010, 11:47 AM
#2
It's a bit rich, but I don't think enough so to be causing knock. Would be easier to diagnose if you could upload the whole log, or at least an image of the problem area.
There are a couple of ways you can post up your log.
Firstly, take a screenshot of the area you want to upload with the printscreen key on your keyboard. Open up MS Paint and hit ctrl + v to paste the image on your canvas. Crop out whatever you don't want to include in your image, and save it (as a .png, not .bmp or .jpg). Then go to http://imageshack.us/ and upload your image. Paste in the code it gives you for forums, and your image will appear here. This works well for posting small areas of a log that can fit in one screenshot.
if you want to upload the whole log, put the file(s) you want to uplaod in a .zip archive scroll down to the "Attach Files" section when you're replying to a post or starting a thread. Browse to the archive you want to upload, select it and it will be attached with your post. Other members will then be able to view it.
There are a couple of ways you can post up your log.
Firstly, take a screenshot of the area you want to upload with the printscreen key on your keyboard. Open up MS Paint and hit ctrl + v to paste the image on your canvas. Crop out whatever you don't want to include in your image, and save it (as a .png, not .bmp or .jpg). Then go to http://imageshack.us/ and upload your image. Paste in the code it gives you for forums, and your image will appear here. This works well for posting small areas of a log that can fit in one screenshot.
if you want to upload the whole log, put the file(s) you want to uplaod in a .zip archive scroll down to the "Attach Files" section when you're replying to a post or starting a thread. Browse to the archive you want to upload, select it and it will be attached with your post. Other members will then be able to view it.
Jun 3, 2010, 12:09 PM
#3
I don't think this is too rich. Are you knocking every pull at the same RPMs ?
Also you can run rich and don't knock. Just pull 1 degree and see what happens. My car was tuned with incorrect Injectors settings, and Im very rich on spool up mid 10s, and I don't knock.
Also you can run rich and don't knock. Just pull 1 degree and see what happens. My car was tuned with incorrect Injectors settings, and Im very rich on spool up mid 10s, and I don't knock.
Last edited by letMeIn; Jun 3, 2010 at 12:18 PM.
Jun 4, 2010, 03:32 PM
#9
I've tuned anywhere from 10.8 to 11.5 with almost no real variation in knock generally. There is usually slightly more power to be had with the leaner mix but never enough for me to consider it worth it. If you are within that window of AFR, try reducing timing a few degrees to see if it consistently goes away, otherwise it may be phantom knock.
Jun 4, 2010, 09:56 PM
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I should have edited it, I just looked at an old log and it was between 11.2-11.6. It was originally a tune by a certain person that said 12.0 with no knock was good and I backed it down a lot. So ignore that post...