'08 SDenali - a little tuning help from forum geniuses?

[concoursd]

9% lean indicates that your volant CAI is making you run too lean and causing spark knock. Fix your LTFT's first with the injector slope, and put the WOT fueling back to default and see how much that helped. If you change your injector slope AND richen the WOT fuel map, then you will be adding the adjustments together. you want to first get part throttle fuel trims dialed in first with the injector slope and then go to WOT fuel. Follow the tutorials in the sticky threads of this forum at the top and use lew's DSlogRedux to give you recommendations based on your datalogging. Having spark knock will kill your fuel mileage and power. Dialing in the fuel and spark with your Cold air intake will get it running as lean and mean as possible.

[G8RDenali]

Great Input Concours, 06MonteSS!!! I'll reprogram the bad boy + let you know how it comes out. Thanks!

First of all.. The file that you posted was the dataviewer file NOT the exported .csv file.

That is ok I was able to look at it anyways.

Your Bank 1 LTFTs are on average ~9.3 and Bank 2 are at ~8.1 on average.

So I would change the injector slope -9 and have a go at that..

Lew will probably back that up..

Hope that helps.

Remember to drive ~50 miles after the change. I would still monitor right away to make sure any changes you make were NOT fat fingered.

THANKS ALL!!! I'm going to give it a shot based on what you said and let you know how it comes out.

Also, I've looked everywhere, but I can't seem to find out what the hell LTFT stands for-- any help? Is there a place I can go and READ what the hell changing injector slope (and all other variables) one way or the other does?

Thanks,

LTFT = Long Term Fuel Trim... these are a couple of the parameters you will need to log.. you will have 2 of them... Long Term Fuel Trim Bank 1 and Long Term Fuel Trim Bank 2

for info on making adjustments, read here:

http://diablosport.com/index.php?name=P ... opic&t=917


adjusting the slope negative makes it spray more fuel, so it makes you richer.

adjusting the slope positive makes it spray less fuel, so it makes you leaner.

if your average LTFT's are, for example, +6... you would adjust your slope to -6% to get them down to around 0.

if your average LTFT's are, for example, -5... you would adjust your slope to +5%...

etc etc etc...