Wanting to know more about 383s

[RDF1]

Turbski for the win-ski? lol Only downside of a turbo is you'll get really bad mileage when loaded if you're in boost all the time. A big block will pull a lot of the time at stoich so the loaded mileage will be better. If that doesn't concern you then i really have a hard time arguing with a turbo 6.0

I actually got good mileage towing. I pulled a 22' enclosed from MS to KY and back. I had just put a cam in and didn't have time to dial the tune in. First 100 miles it drank fuel and was weak. Stopped to look at the scan and retune. I averaged 13mpg the whole trip and used 3 gallons of WWF.
I was easy on the throttle tho. Didn't hammer on it to pull a hill or nothing. And cruised sucked bad till I got that part of the tune dialed in. It would pull a hill and never unlock the TC in 4th.
Everybody said I was gonna beat the bearings out of it towing with boost in the low rpms. But almost made it to 500k miles and still has oil pressure.....

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[Christian Steffen]

I actually got good mileage towing. I pulled a 22' enclosed from MS to KY and back. I had just put a cam in and didn't have time to dial the tune in. First 100 miles it drank fuel and was weak. Stopped to look at the scan and retune. I averaged 13mpg the whole trip and used 3 gallons of WWF.
I was easy on the throttle tho. Didn't hammer on it to pull a hill or nothing. And cruised sucked bad till I got that part of the tune dialed in. It would pull a hill and never unlock the TC in 4th.
Everybody said I was gonna beat the bearings out of it towing with boost in the low rpms. But almost made it to 500k miles and still has oil pressure.....

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That is fricken awesome.. okay I'm sold. Curious where you had it entering BE? I suppose you really only got into boost one hills and when accelerating so that makes sense the mileage was decent.

 

[RDF1]

I'll have to take a pic of my commanded fuel table. At 2000 rpm I'm pretty sure it was 13.0 AFR at 105kpa+.

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[RDF1]

It may have only been 12mpg. Either way I got better mileage than my BIL's F150 and he was pulling a little 4wheeler trailer.

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[Christian Steffen]

It may have only been 12mpg. Either way I got better mileage than my BIL's F150 and he was pulling a little 4wheeler trailer.

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Yeah Im just curious how rich it needs to be under light boost. Though ecoboosts make good power as far as I know their mileage isn't great loaded. I suppose they need more boost to maintain speed so they end up dumping fuel.

 

[RDF1]

Yeah Im just curious how rich it needs to be under light boost. Though ecoboosts make good power as far as I know their mileage isn't great loaded. I suppose they need more boost to maintain speed so they end up dumping fuel.

They get stupid rich fast. They gotta keep the cats from melting.
My buddy had a tuner and a wideband in his EB.
Cut the cats and got the tune dialed in on factory boost and it picked up a ton of power.
The early ones would spit black smoke like a diesel they were so rich.

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[L31MaxExpress]

I have torque for towing for days in OD thanks to a 5.13 rear gear. The old 350 has no issues pulling 6-8,000 lbs uphill with the converter locked up. It cruises 70 mph @ 2,800 rpm. Once I get up in altitude it will drop to 3rd on long steep grades though. It only turns 4,200 rpm @ 70 in 3rd. Right around torque peak and with the gear reduction the speedo stays on 70.

 

[smdk2500]

Yeah Im just curious how rich it needs to be under light boost. Though ecoboosts make good power as far as I know their mileage isn't great loaded. I suppose they need more boost to maintain speed so they end up dumping fuel.

I got about 16-17 out of my ecoboost couple weeks ago pulling a Bonneville up and down hills maintaning 65-70 mph. I don't know how much weight total i was towing but i know it pulled it like it wasn't there.

 

[RDF1]

I got about 16-17 out of my ecoboost couple weeks ago pulling a Bonneville up and down hills maintaning 65-70 mph. I don't know how much weight total i was towing but i know it pulled it like it wasn't there.

Boost is awesome

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[Kyle89]

Well I think I'm sold on the lq4 turbo lol. I think I'm gonna look around and find a way I can turn it up and down while driving for work or (play) lol and then normal driving.