newbie 2001 1500hd

[SmokeyOkie]

I made way more modifications to engine than I can tune, but it seems to be running decent.
main issue is cruising at around 2k rpm I'm getting engine ping
I would really appreciate any pointers or help

My setup is as follows:
2001 Silverado 1500hd
LQ4/4L80e
212/22x 107.5 lsa truck norris cam with springs
shorty headers stock cats true duel exhaust
hpi-42lb-ls3 injectors
706 heads
AEM 30-0300x wired into serial to usb
nbss intake, 16249939 map sensor
92mm cable tb with factory sensors
corvette filter 58 psi
data.gif
7 12 log.hpljuly 12 25.hpt

[bk2life]

main issue is cruising at around 2k rpm I'm getting engine ping

fix this
kjhgytr43.jpg

[horsepowerguru427]

I took your tune and put into SD so you can tune the VE. Youre lean in most the areas youre getting knock, as was pointed out. I changed your injector data to what i had for 42lbers on a gen3 system. Works well with the setups ive used so far. Data is originally from blindsquirrel. I also alter the spark tables for the knock and smoothed the area out, then applied it to the idle spark tables for uniformity. Try this and if itll run get a data log and we can apply it to the VE table. You need to get the air model more accurate, MAF and VE.

Dont try to do idle tuning until your airflow model is accurate. Idle air scalars and tables are based on the main air model. (I noticed you had the Idle Adaptives zero'd in the tune)

Just a word of wisdom, you have stock cats installed and have COT turned off in the tune. That can get dangerous for cat longevity. These cats dont have nine lives lol

[SmokeyOkie]

Thanks Guru, I loaded your tune and this is the log.

[horsepowerguru427]

july 12 25 VE changes after SD log.hpt

Thanks Guru, I loaded your tune and this is the log.

Does it run any better?

Hers your tune with the VE changes from the log applied. Its still gonna be pretty far off. Load the tune, Clear the fuel trim data in the scanner special functions before you start the log. Then get another log. Remeber when youre logging that pedal movement causes transients, so try to keep pedal adjustments to to a minimum. I cant see your wideband in the log, so either post a screenshot of the wideband VE data or blend it into the VE table on your own.

Also, if its running better, try to fill in as many of the cells as possible on the next few logs. That means stop and go driving, mid throttle, light throttle, up hill, down hill. Data in all areas is helpful. 3000RPM going uphill is a much different load than 3000RPM going downhill.

[SmokeyOkie]

7 14 2nd.hpl
still has pinging at above 50+ mph at 2300 rpm and below
and Im very new at tuning so anything that needs changed, please feel free to change it Screenshot 2025-07-14 172945.png

[horsepowerguru427]

7 14 2nd.hpl
still has pinging at above 50+ mph at 2300 rpm and below
and Im very new at tuning so anything that needs changed, please feel free to change it Screenshot 2025-07-14 172945.png

Im assuming that the lean condition in the idle area is more than likely a false reading based on idle "misfire" (valve overlap). The 107 LSA of the cam will cause that. Since the O2s are still active and we're in CL, I used the data from the O2 sensors to alter the VE map. Past 2400rpm added in another 10% and changed the PE settings. Id rather be fat and happy than lean and damaged.

I also averaged you timing tables between what you had and a stock truck. If theres no knock than we can start raising it in areas until we get to what it likes.

[SmokeyOkie]

Awesome info Guru, I will get on it and Thank you for all your help so far

[SmokeyOkie]

Definitely better the ping is not as bad and is now only under 2k rpm
I did try taking away 2 deg timing from low and high octane in just those areas but almost made it worse
7 15.hpl

[gametech]

Definitely better the ping is not as bad and is now only under 2k rpm
I did try taking away 2 deg timing from low and high octane in just those areas but almost made it worse
7 15.hpl

Remember that knock retard is caused by noise, and not all noise comes from the engine pinging. If you still have KR on the logs after your fueling is good and you have reasonable spark advance numbers, start looking for things like exhaust hitting the frame or loose parts rattling somewhere. Also, some cams combinations will trip the knock sensors at a specific rpm range. However, make sure fuel and base spark are good before chasing random noises.

[horsepowerguru427]

Definitely better the ping is not as bad and is now only under 2k rpm
I did try taking away 2 deg timing from low and high octane in just those areas but almost made it worse
7 15.hpl

Heres the same tune i sent earlier with the new log reading applied to VE and i lowered spark in the area it was seeing knock. Go to higher rpms if its not knocking. If its only pulling a degree or 2 and quits at higher rpm i would let it go and get more data for the VE. The knock retard system is there for a reason and its doing its job. Its capable of pulling much more timing than a couple of degrees, so we're still in the safe controllable range. Plus those timing tables are yours averaged with another stock file plus hand smoothing from me. Perfectly fine if it needs a little more work.

[SmokeyOkie]

Gametech I hear ya its an old farm truck it definitely has exhaust rattle (exhaust tip banging on receiver hitch), but this noise is internal and it only does it when its lugging down the highway and gets worse the more the throttle blade opens but as soon as it downshifts or gets above 2k its all good. I've just been keeping it out of overdrive and its fine, but I'm sure it has something to do with 33 tires with 3.73 gears
may just have to change the shift points in trans.

Guru i will get a better log tomorrow and remember to screenshot the afr. Sorry about the shitty log, I was in a bit of a rush to start cutting hay.

[horsepowerguru427]

Gametech I hear ya its an old farm truck it definitely has exhaust rattle (exhaust tip banging on receiver hitch), but this noise is internal and it only does it when its lugging down the highway and gets worse the more the throttle blade opens but as soon as it downshifts or gets above 2k its all good. I've just been keeping it out of overdrive and its fine, but I'm sure it has something to do with 33 tires with 3.73 gears
may just have to change the shift points in trans.

Guru i will get a better log tomorrow and remember to screenshot the afr. Sorry about the shitty log, I was in a bit of a rush to start cutting hay.

Since you mentioned it I updated your tune with the tire and gear wizard. I also used bluecat trans tool and updated the transmission shift points and TCC lockup points. I find usually the WOT shift speed is too high and it hits the rev limiter when i use this tool. If this happens you can just lower the mph in that table to a reasonable point. The pcm has to see MPH then RPM to shift WOT. I increased shift pressures just a bit. If it doesnt help or you dont like it, just load the other file without the trans adjustments.