Really Need a Timing Table

[ImpalaJoe]

Hey whats up guys, i have a 2000 Chevy Impala 3400 that im trying to Powertune, ive got the tranny / fans and all that stuff done, but i have no clue about actual power adders like how to add timing, im extremely unfamiliar with how / what to do to the timing tables since there is just so many variables and i have no idea whats going on

Is there anyone here that could throw me a good advanced timing table bin that i can throw in my PCM? i have a N/A 3400 with Intake / Downpipe / Catback and i always run 93 octane, just looking to get a advanced timing table from someone thats got things setup properly because i have no idea where to start when it comes to modifying mine

should i be looking for something around 30* WOT

[IsaacHayes]

AFAIK, the 3400 has a ton of spark advance already, and a lot of stock vehicles get knock retard from it. I'm not sure if this is only on the grand ams or what. Do you get any KR? I would assume not with 93 octane. So if you are running that it *might* be possible for more timing but it may not gain you much. The iron heads had a ton of advance on the gen1 motors, but the aluminum (gen2 gen3, etc) have a fast burn head so they don't need as much timing.

[ImpalaJoe]

im sure theres room for improvement, stock is never the best performance, especially when stock is designed for 87 octane in a family sedan, i would mess with it myself but i have no clue what to do i just see a huge ass table with 20 different variables for everything imaginable and dont even know where to start advancing things, you think a timing table from like a 3800 would be a improvement? i was looking at it and it has more in some places and less in others

[IsaacHayes]

Considering the 3800 is a whole other animal and it has iron heads I'd say it wouldn't be worth looking at. It has more cause it's iron head.

[ImpalaJoe]

i know someone on here with a 3100 or 3400 has bumped timing up, send me yooo files!

[SappySE107]

Maybe more advance isn't the way to go?

[geldartb]

not every engine is the same. what may be good for one may not be so good for the other.

you should focus on getting a good tune on the engine before going nuts with the spark.

[ImpalaJoe]

what else is there to tune to make it faster? I run a DHP 1.5 file and my 02s are 840mv at WOT, i figured fueling was good because 02s are pretty much dead on, just needed some advanced spark to get things going

[geldartb]

the dhp 1.5 isnt the end all of tuning. you should really get out there and do a ve tune.

if you get out there and tune it by yourself, starting from a 100% stock file minus the trans stuff you changed you will get better results than just relying on the 1.5 bin which is pretty generic.

ever car reacts and performs different.

[sprucegagt]

i know someone on here with a 3100 or 3400 has bumped timing up, send me yooo files!

The only time I have added timing was after disabling the EGR which just so happened to drop about 10 degrees advance on it's own. If my EGR was still working, I would run with less timing, not more. The stock tables will hit about 50 degrees total timing during cruise and that's a little too high.

[ImpalaJoe]

i already disabled my EGR via Powertuner, so now what your saying is i need extra timing from the stuff that the egr disable robbed

I beleive A/F Ratio is already pretty much perfect because i was reading up and it seemed that 860mv 02's was the sweet spot for these motors, at WOT im in the 840s which is damn close, so i figured since A/F / Fueling was good, now i just need spark

what to do

[SappySE107]

Peak performance is from having fuel ignite on time. too early and the piston has to fight the expanding combustion event, and too late, it fully develops too late in the combustion stroke to give the full power potential. The EGR lets exhaust gas back into the intake charge. This requires more advance. Putting it back in without the need is counterproductive. Dyno tune it and find out what advance you need.

[ImpalaJoe]

i dont have 200+ to spend on a dynotune, im just looking for easy ways to get a little more pep from the motor and figured afew degrees of timing would do it since i run 93 and timing is setup for 87

[z34phoenix]

"you have to pay to play"

either drop the money to have someone tune it or spend the time to read and find out how to do it.

Without looking at your scans and bin, i would venture to say your place for gains would be cruse and part throtle, as far as spark goes.

What you really should be looking at is getting your hands on a wide band to know your true AF at wot. then you can either add or pull timing to hit the optimal AF of 12.5:1

The big question should be right now are you seeing any KR? if the answer is no... then i would pull out some of your fuel at wot (base PE) do this in little steps of .1 afr untill you seea small blip of KR and then add back that fuel.

another question is what mods do you have? you should really put them in your sig at the bottom of your posts. it helps a great deal for everyone to know your setup and better help you.

[geldartb]

The only time I have added timing was after disabling the EGR which just so happened to drop about 10 degrees advance on it's own. If my EGR was still working, I would run with less timing, not more. The stock tables will hit about 50 degrees total timing during cruise and that's a little too high.

i can vouch for that stock form i was hitting 45-50 degrees on the highway at 65-70mph.

these things already have high timing from the factory, but seriously ditch the DHP 1.5 bin and start over from stock on your own you will get better results.