Got a 2000 SS M6 with about 40k my cars only mods are Gmmg,FTRA still have a paper filter. since i've had the car out this year I have run sonoco 94 octane every time. At about 4500 to redline "5800" I have a very significant Ping. I bought new plugs and they didn't solve it. I also have a Diablo Predetor. I have only used it to change the rev limit down to 5800 and also for the skip shift delete. other than that the car is Stock. What should I do?

thanks

 

My 2000 Z28 detonated like crazy in the same RPM range as yours. I lowered the total timing from 28 degrees to 26. I lost 0 horsepower and torque to the rear wheels and eliminated the detonation. My air/fuel is right at 12.7-12.8 on the wide band. Mods in sig. Average rear wheel numbers of all dyno runs are 334 RWHP 341 RWTQ. Best 1/4 run in Aug. Texas heat is 13.1 @ 109.4 with a crappy 2.4 60' time.

 

A friend has an '00 and his would ping too. Try backing off the spark with your predator about 5~7% and see if that helps (7% = 2 degrees timing).

 

My 2001 WS6 pinged in the upper RPM range at WOT;
in my case pulling timing didn't reduce ping, but richening the PE pretty much got rid of it.

Keep us posted.

 

I will let you know when the weather clears up

 

Maybe you were running the stock High Octane Timing Table as for 2001 and 2002 GM only gave you 19 degs of timing above 4,400 rpm. This is why these cars respond so well to a PCM tune and increased timing. If you were only running 19 degs then it probably was not your source of the pinging as you found out. Most likely you had a ported MAF or descreened MAF which leaned you out to the point of pinging.

The 1998-2000 cars stock had 28 degs of timing from only 2,400 rpm and above which can be too much if you live in high heat areas, areas of poor octane gas, or have done mods to your car which have leaned the fuel mixture out.


First attachment is the 1998-2000 stock timing table......... I highlited 2400 rpm where the timing is hitting 28 degrees already

Second is the 2001-2002 timing table where at 4400 you only get 19 degs

 

Close...mine hits .027 to .030 oz/cyl (I think - usually use grams/cyl). This means timing is only 18 degrees on the stock table at 4400rpm. But, it does go up above 4400rpm (peak ~22.5 degrees).

Close again...they actually hit 29 degrees at 3200rpm, drop back down to 23 degrees at 4800rpm and return to 28 degrees by 5600rpm.

 

Yes, I'm running the stock 2001 spark tables, looks like the Second one.

I'm in So. Cal. and it does get hot during the day, and the gasoline is crappy (it doesn't even smell like gasoline should), besides being limited to 91 only.

(BTW: my MAF is all stock, but I have been switching between MAF-less and MAF'd week-by-week).

 

You should stick with the MAF. I've got an EFI Live/Excel sheet that I used to dial in part throttle/WOT to -5%~0% using LTFT's and STFT's or a WBO2 if you would like. The trick I noticed is to be creative with your data filters when you log - especially if you have an auto. You might have better luck than most with SD since the weather in So. Cal. is rather consistent. But, the MAF seems to do a bit better IMO. Plus, other things (like the trans) use the MAF readings in their decision making process. So, you might as well keep it...

Once your fueling is in line, try zero-ing out the burst knock table, load the stock high spark table, copy the stock high table to the low, and bump the KR Recovery rate to 0.05. Tordne and I swear by getting rid of the burst knock table over in the EFI Live forums. I have had ~90% less KR since I've done that. If you're still seeing KR after that, I'd pull the timing down a little in the affected areas. If not, restore the stock low table and enjoy.

 

I get good results with and without MAF either way (AFR matches commanded, trans shifts good);

I find that trans. seems to depend on engtrq which is computed from airflow/airmass, so as long as ve table and maf table are correct then trans. is fine in each mode, I verified this in my logs (tfmprs is as expected).

I'll do the burst knock thing over the next few days.

 

Yes, I know....... I was just generalizing. But for specifics I posted the high octane spark table attachments for reference.

Any way to send the EFILive spreadsheet my way? I would be interested in what you are doing. Also which wideband do you recommed to use with EFILive?

Thanks, Greg

 

I'm interested in the spreadsheet too, PM sent.

 

Here you go guys. Instructions are in the sheet...just hold your mouse over the column title (with the little red triangle in the top right corner). I think I've pretty much made this solid. Give it a try over the next couple weeks and let me know what kind of results you're getting. If you have any questions or want some hints on how to set up the filters, I can help with that too.