LS1/LS2/LS3/LS4/LS7 etc. - LOGGING, ADJUSTING INJECTOR SLOPE

Marine_one · Post by **Marine_one** » Mon Apr 19, 2010 8:01 pm

I've carefully read the tutorial at the beginning of this thread, and have read all of the postings in preparation for doing some data logging and adjustments on my 2003 Corvette. I have just a few questions:
The first concerns the twenty minute drive at speed. In the area where I live I will have to drive almost an hour just to get to an interstate. There is a 4-lane divided highway nearby, but the distance between stoplights takes about 12 minutes at normal (60-65) speed. Will I skew my data if I run the route as far as I can at speed, then slow down, cross the median and make the return trip at normal cruising speed?
My car is a 6-speed. I'm guessing that in order to get my cruising RPMs at or above 1,800 for data logging I should use 5th or possibly 4th gear for the run?
In the Update at the bottom of the original posting, Lew stated that he no longer adjusts PE for WOT, because once the injector slope is adjusted and part throttle LTFT's are dialed in, the injectors should be spraying the correct amount of fuel. Lew, would the same logic hold true for other cars or just your setup on the 06 Monte? Once I get my Corvette's LTFT's between 0 and -2, is there any need to do a wide open throttle check or adjustment?
Thanks in advance!

Post by **06MonteSS** » Tue Apr 20, 2010 9:05 am

#1 - that stretch of road will be fine, as long as you can keep your rpms between 1800-2000... you don't HAVE to log for 20 minutes... don't think your model predator will anyway... 8-12 minutes is plenty long...

#2 - yes, use whatever gear you need to so that at normal highway speeds (65/70) your rpms are between 1800-2000...

#3 - in order for you to check any WOT stuff, you'd need to log with a laptop and the dataviewer program, so that you could log the AFR parameter... you don't have that parameter available on the predator itself... you need to use the laptop and the DataViewer app to do it.

or, another general rule is... adjust it about half the amount of what you adjusted your injector slope to in order to get your ltft's dialed in...

i.e. - if you had to adjust your injector slope to -4%, then you could adjust your WOT fueling by -2%.

Marine_one · Post by **Marine_one** » Tue Apr 20, 2010 12:07 pm

Thanks Lew. Appreciate the answers. Will do a logging run today.

Chuck_yager · Post by **Chuck_yager** » Thu Apr 22, 2010 11:23 pm

Okay guys, I know this is going to be a re-run for you, but these tools are absolutely awesome!!!! All the programs are easy to deal with, and exceptionally informative. DSLogRedux is phenomenal! I will get on very soon to make a donation to the cause. And last, but certainly not least, awesome writeup on here Lew! It was a well deserved sticky. I am going to make the adjustments the program is calling for and run another log to see what it says. Once I have that all settled in, I am getting DiabLew tuned!!! I can't wait! Thanks for everyone's hard work again!

Post by **06MonteSS** » Fri Apr 23, 2010 1:10 pm

awesome man!!

Thanks for the good words, I appreciate it! glad it helped ya out...

Avy.08 · Post by **Avy.08** » Sun May 30, 2010 8:18 am

06MonteSS wrote: #3 - in order for you to check any WOT stuff, you'd need to log with a laptop and the dataviewer program, so that you could log the AFR parameter... you don't have that parameter available on the predator itself... you need to use the laptop and the DataViewer app to do it.

or, another general rule is... adjust it about half the amount of what you adjusted your injector slope to in order to get your ltft's dialed in...

i.e. - if you had to adjust your injector

slope to -4%, then you could adjust your WOT fueling by -2%.

Hi Lew,,

I want to ask you how can i do step 3 with my laptop?
Can you expline it to me??

Post by **06MonteSS** » Sun May 30, 2010 8:29 am

you don't need to man... for your 08 Avalanche, your 7194 predator DOES log the AFR (Equivalence Ratio) parameter...

so, you can just use your predator for yours...

Avy.08 · Post by **Avy.08** » Sun May 30, 2010 8:57 am

Ok,, thanks man

But i want to be sure, is this the PE WOT : D

Post by **06MonteSS** » Sun May 30, 2010 9:53 am

with normal, part-throttle, steady driving/cruising data logging, your AFR will always be 14.7...

it will be lower when you do a WOT data log...

calbert · Post by **calbert** » Wed Jun 16, 2010 4:39 pm

This is a great thread. Not sure yet, how all this will pan out for me with the 2010 Camaro, but I've tuned with the 93 Octane, setup the log, did about 75 - 100kms. of driving.

Next step, I will drive for about 15min. and then cruise at about 120km p/hr. which should get me to 2.5 - 3k RPM's in 4th. gear.

So, after I get my log I will make the changes listed here to see if there is a difference.

So, far definately noticing much better performance especially with Rev. Limiter tuned better, and Speed Limiter turned "off".

Still, though accelleration is not impressive with stock setting, the SprintBosster enabled in Sport or Race mode definately helps.

Not to clear thoug on this Injector Slope setting;
Does this improve overall performance in terms of HP / Torque or responsivness?

Or does it simply provide better fuel useage?

And what is a WOT?

Also, why wouldn't I want to log everything doesn't the other parameters play a role in the the tools ability to make a better recommendation for tune changes?

Post by **06MonteSS** » Wed Jun 16, 2010 5:11 pm

calbert wrote:This is a great thread. Not sure yet, how all this will pan out for me with the 2010 Camaro, but I've tuned with the 93 Octane, setup the log, did about 75 - 100kms. of driving.

Next step, I will drive for about 15min. and then cruise at about 120km p/hr. which should get me to 2.5 - 3k RPM's in 4th. gear.

So, after I get my log I will make the changes listed here to see if there is a difference.

So, far definately noticing much better performance especially with Rev. Limiter tuned better, and Speed Limiter turned "off".

Still, though accelleration is not impressive with stock setting, the SprintBosster enabled in Sport or Race mode definately helps.

Not to clear thoug on this Injector Slope setting;
Does this improve overall performance in terms of HP / Torque or responsivness?

Or does it simply provide better fuel useage?

And what is a WOT?

Also, why wouldn't I want to log everything doesn't the other parameters play a role in the the tools ability to make a better recommendation for tune changes?

those rpms are too high....

ideally, you want to be at 1800-2000 rpms....

calbert · Post by **calbert** » Thu Jun 17, 2010 1:42 pm

Okay. So, finally got some time to drive around long enough, on clear roads to put some log data on the Trinity as suggested in this whitepaper. Here's what I did:

1. Drove vehicle for about 20mins. moderate speed between 80 - 100kph.
2. Then started to log data, at which point speed was increased to around 120 - 140kph (OTR), for about another 20mins. LOL
3. Saved the log data.

Next:
Loaded .csv log data into the DSLogRedux tool, this is what I found, and a few questions.

WOT Bursts:
"The WOT TKSR data found indicates and average TKSR of .381 deg. and a maximum TKSR of 7.910 deg. Please, view the TKSR output data file for possible continuous, excessive knock retard. (I'm worried about this one big time)."

1. Obviously, not good. I'm using 93 Octane, with the 93 Octane tuen. What do I do about this? Will the WOT PE adjustment fix this?

WOT PE Adjustments:
"WARNING: Cruise LTFT analysis indicates a recommended adjustment of 2%, ......... Do not adjust the PE table until you are sure cruiste LTFT data reduction would indicate that no adjustment is necessary, Adjust Cruise LTFT's first".

2. Okay. So, it suggests I adjust PE 2%, cool. What about "Cruise LTFT's first"? Where is that? Is that the "Inj. Slope" stuff? Will the 2% adjustment resolve Knock Retard?

3. Do I adjust the "Injector Slopes", and how much? Where are they "Modify Tune", "Diablo", "Fuel"?
LTFT Bank 1: Avg. = -3.1, Min. = -7.8, Max. = 0 -> "Injector Slope" for LTFT Bank 1 should increase 4.1%, right?
LTFT Bank 2: Avg. = -2.7, Min. = -11.7, Max. = 0 -> "Injector Slope" for LTFT Bank 1 should increase 3.7%, right?

4. Above it says not to adjust PE? Confused a bit. Where are the PE's and should I adjust them after LTFT 2% as suggested in the DSLogRedux tool? Or, just do "Injector Slope", and check results first, before doing PE?

Post by **06MonteSS** » Thu Jun 17, 2010 5:34 pm

PE = WOT

do not do any PE/WOT adjustments until after you've gotten your ltft's dialed in for normal steady driving.... so, pay no attention to the WOT stuff... shouldn't have gone WOT in a cruising log anyway... but, no matter... DSLogRedux filters out the WOT data for the steady driving/ltft/injector slope stuff anyway...

for the injector slope adjustment... it tells you your average ltft's... then recommends what you should adjust your injector slope adjustment to...

what did it say your average ltft's were?

what did it tell ya to adjust your injector slope by???

when in doubt, RTFM/help file... hahaha....

calbert · Post by **calbert** » Thu Jun 17, 2010 6:33 pm

OMG; I just realized I might be using the wrong .CSV fille. Oops... one sec...

calbert · Post by **calbert** » Thu Jun 17, 2010 6:55 pm

Okay, after confirming viewing correct file, after your not so clear cryptic warning message.

Avg. LTFT Bank 1: 5.7
Avg. LTFT Bank 2: 4.3
Inj. Slope: -6%

So, am I good to make this adjusment with a confident smile on my face? Now all I have to do is find the setting on the Trinity.