We are all being told get your Ltrims to zero or slightly negative, then go hit the wideband and tweak pe/rpm to achieve your desired a/f ratio.

Well there are numerous ways to get the Ltrims down to zero or slightly negative. Are all valid or is there a true "proper" way to do it. I have to believe it's the latter.

For example I can tweak the injector flow rate and leave everything else stock to achieve my desired l-trims with my 42# injectors then dial in my pe vs rpm table and I do indeed get my desired a/f ratio at wot but the car is a dog.

I then tried using the spreadsheet for the injector flow rate and then, due to a complete lack of understanding on my part, have guessed at a new injector offset, this got me close on ltrims, then I tweaked the maf table in the areas that needed it to get ltrims down accross the board. Now the car is worlds faster.

But.... is my hodgepodge approach acceptable? or am I masking problems tweaking one table to compensate for the other and I could end up paying dearly in the end???? Again my guess is the latter.

Edit is very powerfull but I sure wish it was a bit like my brothers mustang's speed brain where it says ok what size and type are your new injetors and it does all the background work for you.

Or if a guide or calculators like Chris makes were available along with the values of the more popular injectors and such to plug into them it would be SO VERY usefull.

If there was resource for us semi smart people for calculating these values the rest of tuning is cake. I know Chris has spreadsheets and the injector flow rate one is very easy to use and makes total sense but the injector offset makes zero sense and I don't expect him to babysit me thru it (although it would be great if you did <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

I feel these tools should be provided with the product and would probably not take much effort on the developers part as they must already have a complete understanding of how these tables work.
It would make the product so much more user friendly.

 

Great to see i'm not the only one, having trouble understanding the nature of each parameter, if we all put our heads together, i sure people like ChrisB and other, can add more information at they web site as it arises, to help those who need it the most.

 

Heath,

This is a great post. I have been dialing in my LTRIMs with the injector flow rate table and have them where everyone says that they should be...I also have my AFR at 12:1 now, but the car feels more sluggish then it should.

This weekend I am going to adjust the IFR table back to the stock values and mess with the injector offset table and the MAF table to get them in line...then adjust my PE v. RPM.

I am hoping that the car will pick up some power!

Thanks,

Scott

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Blackbird:
<strong>
Edit is very powerfull but I sure wish it was a bit like my brothers mustang's speed brain where it says ok what size and type are your new injetors and it does all the background work for you.

Or if a guide or calculators like Chris makes were available along with the values of the more popular injectors and such to plug into them it would be SO VERY usefull.

I feel these tools should be provided with the product and would probably not take much effort on the developers part as they must already have a complete understanding of how these tables work.

It would make the product so much more user friendly.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Well said! Edit should come with a manual IMO. <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" /> However, since it doesn't it leaves a great opportunity for anyone who decides to make a Edit manual. They should call it, "LS1Edit for dummies who don't want to be dummies." <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

Derrick <img border="0" alt="[Fluffy]" title="" src="graemlins/fluffy.gif" />

 

I outlined how I would suggest going about tuning the car on my ls1 edit website

ls1edit.slowcar.net

that said, in the end as long as it "works" and doesn't present any problems it should be fine.

I wouldn't tweak the injector flow rates simply because those are a "known" value and one that can be calculated exactly. My philospophy is to try and keep all the data in the pcm as "real world" as possible.

I use the MAF table because, once intake path changes have been made, it is no longer accurate. I assume the inaccuracy in l-trims is inherent in this table and so adjust it to fix them. I can calculate exactly what my injector flow rates should be, so don't see any reason to deviate from that.

In the end you have "done it right" when your car makes the most power/runs the best <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Chris

 

Chris,

For me, the injector flow rate table is not a constant due to the regulator that came with my Incon kit.

The regulator is vacuum regulated, but it does not rise 1/1 with boost. I usually see a rise when I go from 18" of vacuum to 0 of about 60 psi...60 psi at 18" and 66 psi at 0".

So I think that I need to adjust this table, correct?

Scott