Torque curve for 5.3L HO??

OFF-RD · August 14, 2006

Does anybody know where I can find an accurate torque/hp chart for a stock 5.3L HO engine? I'm wondering where my truck actually starts making decent torque. Thanks.

Hecktorx · August 14, 2006

http://media.gm.com/us/powertrain/en/produ...ORTEC53LGENIVV8

Just click on SAE and the dyno results will come up.

Buggle_96 · August 14, 2006

Thats freakin sweet!

mannymach1 · August 14, 2006

Yup, thanks for the linkee...that's a sweet site

ZZebes · August 17, 2006

http://media.gm.com/us/powertrain/en/produ..._L33_Sierra.pdf

Hate to burst the bubble but this is the HO (L33)

OFF-RD · August 23, 2006

That chart is showing about 300 lb./ft. of torque at 2,000 RPM. If that's true..then why does my truck downshift at every little hill? Why does it tow like crap? My previous vehicle was a Jeep Liberty CRD, and it made 300 lb./ft. at 2,000 RPM and it would never downshift at hills and it towed my trailer like a dream. I'm very confused here....

Buggle_96 · August 23, 2006

That chart is showing about 300 lb./ft. of torque at 2,000 RPM. If that's true..then why does my truck downshift at every little hill? Why does it tow like crap? My previous vehicle was a Jeep Liberty CRD, and it made 300 lb./ft. at 2,000 RPM and it would never downshift at hills and it towed my trailer like a dream. I'm very confused here....

<{POST_SNAPBACK}>

Torque management, get a tune for $158.10 from wait4me. I think it is worth it just to have it not down shift once. I recently came out to colorado from kansas, it never downshifted once running 80 to 85 and it unlocked the torque converter twice on a few steep hills. This is with 3.42s.

Mark_in_Tulsa · August 23, 2006

That chart is showing about 300 lb./ft. of torque at 2,000 RPM. If that's true..then why does my truck downshift at every little hill? Why does it tow like crap? My previous vehicle was a Jeep Liberty CRD, and it made 300 lb./ft. at 2,000 RPM and it would never downshift at hills and it towed my trailer like a dream. I'm very confused here....

<{POST_SNAPBACK}>

It makes 300TQ at full throttle at 2000 RPM's. When your cruising along at 2000 RPMs on the HWY, it's not dumping in much air or fuel. And the PCM in the truck is smart enough to just drop it down a gear, instead of dumping in more fuel to sustain that speed up a hill, to help with mpg.

I really don't know what hp or tq the motor is making at 2000 RPM's while cruising. But I bet 100 HP is enough to sustain that on a flat road.

OFF-RD · August 24, 2006

That chart is showing about 300 lb./ft. of torque at 2,000 RPM. If that's true..then why does my truck downshift at every little hill? Why does it tow like crap? My previous vehicle was a Jeep Liberty CRD, and it made 300 lb./ft. at 2,000 RPM and it would never downshift at hills and it towed my trailer like a dream. I'm very confused here....

<{POST_SNAPBACK}>

It makes 300TQ at full throttle at 2000 RPM's. When your cruising along at 2000 RPMs on the HWY, it's not dumping in much air or fuel. And the PCM in the truck is smart enough to just drop it down a gear, instead of dumping in more fuel to sustain that speed up a hill, to help with mpg.

I really don't know what hp or tq the motor is making at 2000 RPM's while cruising. But I bet 100 HP is enough to sustain that on a flat road.

<{POST_SNAPBACK}>

So basically what you are saying then is my engine will never make 300 lb./ft. at 2,000 RPM. Because with the automatic transmission, there is never a time I can think of when it would ever allow full throttle at 2,000 RPM while towing. So basically, if you want a truck that's well suited for towing you need either a diesel engine, or a manual transmission. I'm sick and tired of my truck dropping down to 2nd gear and screaming at 4,500 RPM just to pull small hills with a trailer hooked up.

Buggle_96 · August 24, 2006

That chart is showing about 300 lb./ft. of torque at 2,000 RPM. If that's true..then why does my truck downshift at every little hill? Why does it tow like crap? My previous vehicle was a Jeep Liberty CRD, and it made 300 lb./ft. at 2,000 RPM and it would never downshift at hills and it towed my trailer like a dream. I'm very confused here....

<{POST_SNAPBACK}>

It makes 300TQ at full throttle at 2000 RPM's. When your cruising along at 2000 RPMs on the HWY, it's not dumping in much air or fuel. And the PCM in the truck is smart enough to just drop it down a gear, instead of dumping in more fuel to sustain that speed up a hill, to help with mpg.

I really don't know what hp or tq the motor is making at 2000 RPM's while cruising. But I bet 100 HP is enough to sustain that on a flat road.

<{POST_SNAPBACK}>

So basically what you are saying then is my engine will never make 300 lb./ft. at 2,000 RPM. Because with the automatic transmission, there is never a time I can think of when it would ever allow full throttle at 2,000 RPM while towing. So basically, if you want a truck that's well suited for towing you need either a diesel engine, or a manual transmission. I'm sick and tired of my truck dropping down to 2nd gear and screaming at 4,500 RPM just to pull small hills with a trailer hooked up.

<{POST_SNAPBACK}>

Keep it in 3 and get a tune. If you are towing in D you will have this happen more often because you are approaching the hills with less power. It goes into oh s**t mode, assuming you are using cruise controle, and try to get back to that speed. It will simply jump past 3rd. Also use the pedal on hills, the truck will pull alot better. I just came out to colorado from eastern kansas, running cruise at 75 i got 19.3. on the way to denver colorado i ran 80 - 90 mostly 85 and got 22.2 average and i never touched the cruise control. I think the problem is that cruise does anything and everything to stick to that speed, i let the speed decrease while climbing tall hills and increase going down. Try it out. A tune will help alot too.

Mark_in_Tulsa · August 24, 2006

That chart is showing about 300 lb./ft. of torque at 2,000 RPM. If that's true..then why does my truck downshift at every little hill? Why does it tow like crap? My previous vehicle was a Jeep Liberty CRD, and it made 300 lb./ft. at 2,000 RPM and it would never downshift at hills and it towed my trailer like a dream. I'm very confused here....

<{POST_SNAPBACK}>

It makes 300TQ at full throttle at 2000 RPM's. When your cruising along at 2000 RPMs on the HWY, it's not dumping in much air or fuel. And the PCM in the truck is smart enough to just drop it down a gear, instead of dumping in more fuel to sustain that speed up a hill, to help with mpg.

I really don't know what hp or tq the motor is making at 2000 RPM's while cruising. But I bet 100 HP is enough to sustain that on a flat road.

<{POST_SNAPBACK}>

So basically what you are saying then is my engine will never make 300 lb./ft. at 2,000 RPM. Because with the automatic transmission, there is never a time I can think of when it would ever allow full throttle at 2,000 RPM while towing. So basically, if you want a truck that's well suited for towing you need either a diesel engine, or a manual transmission. I'm sick and tired of my truck dropping down to 2nd gear and screaming at 4,500 RPM just to pull small hills with a trailer hooked up.

<{POST_SNAPBACK}>

Even if your locked in at 3rd gear, right at 2000 rpm's your truck will not be making that much power if your just cruising. Now if your towing a load behind you, the pcm will know and think, "hey, why am I struggling here. Maybe I should dump more fuel and air in to the motor to make more power to sustain this speed." And then you will be making more power.

Or if you floor it, it will dump as much fuel and air as the stock PCM will allow into the motor.

Also think about the new displacement on demand thing that's been out for about a year now, with Dodge and Chevy. The truck knows that it can keep that 55 mph going even on 4 cylinders. So the PCM drops it to a V4, until it senses that it needs more power, for a hill, or acceleration, or a head wind, or if you have a sudden load on your truck. And when it senses a load on the motor, it will bring it back up to a V8.

The truck doesn't need full power at all times. So to save on fuel and emissions, it lowers or raises the hp and tq of the motor by adjusting the timing, and fuel.....etc.

Now I am no expert at this. This is just what I have gathered from other. So If I'm wrong then hopefully someone will politely correct me on this.