6.0 slug
08-30-2012, 07:54 PM
#11
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Gotcha boss man. I wasn't talking back pressure shenanigans with stepping down to a single. More velocity/cylinder evac at low rpm. 364" tow rig and 3" duals from the factory is weird. But you actually own one. How much peak timing does the stock lq4 tune give you at wot?
08-30-2012, 08:21 PM
#12
Backpressure works great..... because we need it on the steam generators at work to make steam and have control valves in place for it.... Engine's not so much.
The factory exhaust is overkill muffler forward, I agree, but the neckdown in the factory muffler is pretty retarded. Something like 2" tubes...... Then, in my case, my truck only has a single 2.75" tailpipe anyhow. The 2500 HD's and whatnot have a 3.5" pipe attached to what looks like 2.75" dual out.... even though only one actually flows through and the other is a resonance chamber that goes nowhere.
17 degrees like I mentioned in my first post was all I got out of mine in my logs wide open on midgrade fuel at that point. Pathetic, lol. Now I consistently have 26 or 27 degrees with essentially zero knock on premium gas. On the factory tune the reason probably follows with the 1 minute power enrichment delay the HD's have forcing them lean at WOT. Although the high octane timing table on an LQ4 powered Denali as an example is identical to mine stock, and doesn't have PE delay.
The factory exhaust is overkill muffler forward, I agree, but the neckdown in the factory muffler is pretty retarded. Something like 2" tubes...... Then, in my case, my truck only has a single 2.75" tailpipe anyhow. The 2500 HD's and whatnot have a 3.5" pipe attached to what looks like 2.75" dual out.... even though only one actually flows through and the other is a resonance chamber that goes nowhere.
17 degrees like I mentioned in my first post was all I got out of mine in my logs wide open on midgrade fuel at that point. Pathetic, lol. Now I consistently have 26 or 27 degrees with essentially zero knock on premium gas. On the factory tune the reason probably follows with the 1 minute power enrichment delay the HD's have forcing them lean at WOT. Although the high octane timing table on an LQ4 powered Denali as an example is identical to mine stock, and doesn't have PE delay.
08-30-2012, 09:59 PM
#13
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Wish I could have convinced my grandpa to have his '02 1500hd tuned instead of buying a pos '07 6.0 diesel new. 20k in cumulative parts/labor later, it should put 450 to the tires 
The chevy was held back to a ridiculous degree from the way it drove. All stock other than an aftermarket di/do muffler. My 5.3 timing was around there if I remember correctly, but you mentioned the p.e. delay. Maybe even more tm and abuse mode crap for folks towing 20k up a mountain. And the 6.0 tugs around way more truck, so it has to be even more annoying.
The chevy was held back to a ridiculous degree from the way it drove. All stock other than an aftermarket di/do muffler. My 5.3 timing was around there if I remember correctly, but you mentioned the p.e. delay. Maybe even more tm and abuse mode crap for folks towing 20k up a mountain. And the 6.0 tugs around way more truck, so it has to be even more annoying.
08-30-2012, 10:11 PM
#14
Wish I could have convinced my grandpa to have his '02 1500hd tuned instead of buying a pos '07 6.0 diesel new. 20k in cumulative parts/labor later, it should put 450 to the tires The chevy was held back to a ridiculous degree from the way it drove. All stock other than an aftermarket di/do muffler. My 5.3 timing was around there if I remember correctly, but you mentioned the p.e. delay. Maybe even more tm and abuse mode crap for folks towing 20k up a mountain. And the 6.0 tugs around way more truck, so it has to be even more annoying.
The chevy was held back to a ridiculous degree from the way it drove. All stock other than an aftermarket di/do muffler. My 5.3 timing was around there if I remember correctly, but you mentioned the p.e. delay. Maybe even more tm and abuse mode crap for folks towing 20k up a mountain. And the 6.0 tugs around way more truck, so it has to be even more annoying.They all have a bunch of abuse and torque limitation junk. When you reduce or remove all of it suddenly you have something that drives like it wasn't tuned by a guy who sat in the corner with a helmet on drooling.
You could probably drive a 6 liter up the side of a mountain with 80 octane fuel in it and 15000 lbs and not hurt it on the stock tune. It's no secret why they are such a gutless turd in stock form.
And really they need more gearing. The 4L80E has nothing in first to get you moving... and if it has 3.73's like mine it shows. Hell my factory tow rating is less than the trucks rated GVW ( 7900 lbs vs an 8600 GVW)....... You don't see that very often. 4.10 is better, but not by a hell of a lot.
Then you have the other extreme of the newer trucks with a head that flows way more than a 6 liter engine could ever be bothered using( and it shows with the powerband) and granny low with a big gap for second. As time passes the guy with the helmet doesn't learn a heck of a lot.
08-30-2012, 10:19 PM
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21* sound right for a stock 5.3? I had a brain fart.. Dude I know has a 99-02 2500 light duty ec/sb 4x4 on 33's, 3.73 gears with ranch hand bumpers on both ends. He was a bit surprised when I walked his *non sti* 02 wrx with said truck as his gmt800 point of reference 
08-30-2012, 10:42 PM
#16
I outran my girlfriends 2002 Grand Prix GTP with mine..... and my truck 1500 lbs or so of wieght sitting on it. Her car absolutely blows. Raced quite a few Hemi Rams ( easy to egg on ) and haven't lost yet. All highway rolls for the Rams. Roar like crazy but don't accelerate. I make it fair as a of course a regular cab would smoke my truck..... or should lol. Faster in something light or on the internet only. I made the mistake of buying one once.... and my mom has one..... and I used to pick on the R/T owners when I had an SRT8.
Yep, 21 sounds about right for an LM7.
Yep, 21 sounds about right for an LM7.
Last edited by 1994Vmax; 08-30-2012 at 10:51 PM.
08-31-2012, 12:44 PM
#18
Meh. My buddies stock 97 Chev extended cab 4X4 Vortec 350 killed my 09 "eagle" Hemi crew cab 4X4 with 3.92 gears on a highway roll.... I'm revved out in 2nd Prime and he is still pulling on me... And yes that POS Chev was some heap he bought cheap with over 200000 miles on it as a beater. Bone stock down to the intake and exhaust..... as was my Ram. I lost to a 5.3 extended cab previous to that but wrote it off as a fluke. I completely gave up on Dodge at that point in time, sold that pile and never looked back. My mothers is an 06 3.92 geared quad cab and it's a gutless wonder too. You might luck out and beat TBI 350's with that thing....... 345 HP at the crank somehow becomes maybe 200 HP at the wheels on the pre 09's in a 5K plus truck.... Real hot rod.
They are only fast on the internet......
They are only fast on the internet......
Last edited by 1994Vmax; 08-31-2012 at 12:56 PM.
08-31-2012, 01:51 PM
#19
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yea, ive tuned a couple 2500HD 6.0s and it made a huge difference.
and i wanna say they are setup to shift at 5000? 60 sec delay on PE, and no timing at all..
Remove all TM and set the spark and timing and you have a whole new truck!
and i wanna say they are setup to shift at 5000? 60 sec delay on PE, and no timing at all..
Remove all TM and set the spark and timing and you have a whole new truck!
08-31-2012, 02:03 PM
#20
5200 rpm WOT just like the 1/2 ton trucks with LQ4's with a 5600 rpm rev limiter. But yeah 60 second PE delay and nothing for timing.