Diablosport Forums

Firstly, I would like to thank diablosport for making a good product. In this day and age, plug and play is actually an acronym for -may work afters hours of downloads to fix bugs. Your product worked right-out-of-the-box !! Secondly, the programmer would not be any fun without the great threads and supplementary apps from 06MonteSS. Diablo owes you a bit of gratitude.

Okay, my questions are:

1) How should alter the injectors, PE, and spark advance for temperature changes? -I typically log at night- I live in the bay area and no way can I go WOT on highway during the day. There's just too much traffic.

2) How should I alter the tune for atomspheric pressure changes, e.g., rain vs. sunny Cali day?

Oh yeah, I should probably tell you "what's I got". I have 2006 GTO with only a Volant CAI mod. (I working on getting a maggie FI which will set me $8k back)

One last thing that I sure 06MonteSS would like to know, I did a data reduc with the sweet app "DSLogRedux". My AFR at WOF averages 12.28 and the average LTF is about -1.9 for which the program recommends to increase by +1%.

My car is running great! I hung with C06. At the next light the guy in corvette asked me if my goat was supercharged. I said no and all I have CAI and a custom tune. I think his stones shunk to peas, knowing my goat costs new -$30k after tax, reg&license, and bolt-on mods (GMC employee price with $2k off incentives), while his vette up around $50k. I brag about the fact l that I got a supercar for a family sedan price.

Thanks in advance for whatever input you folks can provide.

P.S. I attached the data log from last night.

you forgot to attach the log..

have you made any adjustments to the tune? which tune are you using?? if you're in Cali, I'm assuming you're using the 91 octane tune?

try attaching the log file again and let's check it out..

you may have to zip the file first..

Huh,

I thought it attached. Oh I see the problem, the system does not allow csv extension. Okay, I will zip it. BTW I am using the 91 octane tune with no mods.

Thanks Lew for the quick response.

I was kind of wondering the same thing. Should I plan on having to “re-tuneâ€

08_Z71....

once it gets warmer out, just re-check your ltft's... they will fluctuate from colder to warmer temps... when it gets warmer out, you will run a little richer do to the warmer air being less dense than the colder air... so the amount of air flowing into the MAF and intake will be little less...

as long as you keep things in the 0 to -2 range for your ltft's, you'll be all set.

oldgoatgoesnew...

k, your numbers all look good man... your ltft's are at 0.43 and -1.25... nice!

at WOT, you look good too.. ltft's lock at 0...

however, when doing the next log, be sure to log the parameter for Engine Speed (rpm's)....

now, having said that, get me one more log with a good WOT run in it...

it looks like we may be able to lean you out a little at WOT to get you some more giddy-up, but I wanna see a WOT log with the engine speed (rpm's) in it, so we know what rpm range we're in... cuz you have little blips of KR - but only 0.xxx which is nothing - but by seeing the rpm's, I'd be able to determine if this is because of deceleration, a shift point, stomping the pedal, etc etc.

06MonteSS wrote:08_Z71....
once it gets warmer out, just re-check your ltft's... they will fluctuate from colder to warmer temps... when it gets warmer out, you will run a little richer do to the warmer air being less dense than the colder air... so the amount of air flowing into the MAF and intake will be little less...
as long as you keep things in the 0 to -2 range for your ltft's, you'll be all set.

Lew, Thanks. I plan on checking some logs as the weather changes just because ........ now I can. This thing is pretty cool.

Now, .......can you explain this in layman terms?
Don

The formula for the density of dry air is given by: \rho = \frac{p}{R \cdot T}
where Ï

Lew,I have posted a new log that has both engine and vehicle speed. I notice that get around 1-2 degrees of knock when I mash on the pedal. Is this due to downshifting? I have an A4 trans.

Thx for the reply!!

yeah, where you first started, that's from mashing it to the floor (tip-in KR)... all the other runs are ok... little KR here and there...

I notice in this new log, that your ltft's are off compared to the first log you sent me...

in this log, your average ltft's are at 1.10 and 2.23...

was your car all warmed up to normal operating temps before this log?? drove for about 15 minutes before logging? or was it colder out during this log than it was for that first one?

I let the car warmup for ~1/2 hr or so before I did the log, but I was on a back road (middle of nowhere with no cops). I wasn't keeping a very constant speed or engine rpms between WOTs and slowing down frequently. Could this have effected the LTFTs? I did some other logs the same night, same settings on the highway, and the LTFTs seemed to be fine. To much traffic on the highways to do long WOTs, so I went to some deserted road to haul a$$. Lot of fun but scary around bends at 100+.

yes, that will most definitely affect ltft's... when you're doing a log, you need to be doing steady driving/cruising - like on a highway...

uugghhh....

I quit... LOL HA HA HA HA HA

I'm just burnt out..... not cuz of you... just in general...

hahahahahha

Sorry, I forgot to mention that in my post. I thought just doing a few pulls on a quiet country road to see what my AFR is at WOT would suffice. After reading most the posts on this forum, I think I got a handle on how to log and tweak the tune without blowing up the engine. Thanks for all the help Lew. Your programs and advice have been great for novices like me.

I am thinking about doing exhaust mods next. I heard good things about kooks long tubes and Magnaflow x-pipe mids and catback. Well, I am going pester some people over in the LS2 forum, see what they think.

Thanks again