LT1Falcon

iTrader: (3)

how much can i safely advance the timing on a stock motor? or will it even help at all?

Formula350

iTrader: (3)

I can only assume it's degrees, but when looking at the stock tune on my 93, it goes up to 43 lol I don't know what the trick with timing and FI is.

carzman5678

LT1 stock runs timing almost on borderline of pinging.

LiENUS

With 91 octane yes, most places have 93 octane now. I was able to add 5 degrees almost accross the board with no knock.

LT1Falcon

iTrader: (3)

what if advanced it 1 or 2 degrees across the rpm range, think i could hurt anything?

dhdenney

iTrader: (53)

Quick question, how you gonna advance your timing?

Taubr Unit

iTrader: (32)

personially i got a msd timing box with the **** i can turn on the fly! I cheated!

Formula350

iTrader: (3)

I retarded mine around 2-3º across the board and it seems like my pinging went down. Was nice.

thebufenator

iTrader: (2)

just curious if dropping the engine temps will help elliminate pinging........

Formula350

iTrader: (3)

If it's due to the fuel getting to hot, sure.

LT1Falcon

iTrader: (3)

its pretty easy if u can burn your own EPROMs, u just type in a few numbers on the software, burn a chip, pull out the old one, and put the new one in.

dhdenney

iTrader: (53)

OK didn't know you could do that. Actually, I've never known anyone to be able to burn chips.

LiENUS

If you are hearing pinging then somethings wrong, even with 87 octane you shouldn't be hearing any ping at all. I advanced mine 5 degrees at cruising and 2 degrees at WOT and hear no pinging at all. Your knock sensor is probably dead

LT1Falcon

iTrader: (3)

i forgot to mention that the chip is soldered into the circuit board from the factory, so you have to heat the solder to get it out the first time, and then you must solder in a special board that allows you to pull the chip in and out continuously, (dont ask me where i got it, it was about 4 years ago and i dont remember, dont even remember the real name of it). also i used tuner CATS software if your interested but there are other places

infinitebird

iTrader: (11)

You can most definitely get pinging if you run 87 in these engines under hard acceleration with the timing stock or advanced any. Might want to read your owners manual.

That doesn't mean that will work on all cars/engines. On two previous lt1 cars I had there was knock detected even at the stock timing level. This can result from any number of things including just simple old/worn out engine parts.

Also, if the knock sensor is dead, the computer goes into a safe mode and retards timing by an excessive amount which would probably mean you are less likely to get/hear any pinging in that circumstance.

Another thing, just because you don't "hear" any pinging doesn't mean you aren't getting knock. If the computer hears any knock from the sensor it retards timing almost instantly, in most cases faster than you will be able to hear it. So even if you advanced timing 10 degrees and didn't hear any pinging, that could just be because it retarded 8-9 degrees due to knock.

Basically, unless you preformed a data log to verify that you are actually not getting any knock at that setting, I would not recommend advancing the timing 5 degrees on a stock motor.

LiENUS

You get pinging but the knock sensor should pull timing before you hear it.
If the knock sensor is disconnected the computer goes into a safe mode and retards timing by an excessive amount which would probably mean you are less likely to get/hear any pinging in that circumstance.
If the knock sensor is dead the computer does not detect any knock and does not pull any timing.
Pinging is different from knock. When I added 5 degrees of timing there was no knock retard AT ALL. I scanned it and there is no knock retard. I didn't even get knock retard till 6 degrees and even then it was only .3 degrees of knock retard and once again you don't hear pining because... the computer pulls timing BEFORE you hear the pinging.
No I flashed my cars pcm with magic fairy dust. I have no data logging capabilities at all

Formula350

iTrader: (3)

Interesting debate. To add some fuel to this, I'll add this. I only get the ping during WOT in higher RPMs (4500+). It's not all the time either.

LT1Falcon

iTrader: (3)

my knock sensor was taking about 1 degree out off the line for about a second, but that was because i was using 87 octane. i had a girl watch my scanner while i went down the track and she said it was at 1 for a second, flashed to 2 for an instant, then was ok on the top end, if that tells you anything. i think i will be more than ok when i put 92 in it

LiENUS

You can't just use a scanner, you really need to datalog and keep in mind that the KR stays for a little bit after the initial knock (see knock retard recovery rate in the pcm). So you are really only interest in the initial knock retard up to the spike accompanying it, once the KR starts to go down you arent interest in those fields.

LT1Falcon

iTrader: (3)

no, if i understand you right, i want to mess with the opposite, i want to add timing to the fields that are currently not knocking, but i figure once i start runnin 92 octane, i should be able to add a degree or 2 even the trouble areas (im guessin from about 1000 rpms to 3000 since i launch at idle).