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Old 12-17-2015, 05:57 AM   #15
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why does it seem odd ? The pickup truck guys have been turbocharging their 8.1 with some degree of success. and there is room if you install them underneath and plumb forward. Just asked a question. Turbo lag wouldn't be an issue unless you are racing. Engines are just big air compressors the more cool air in the better the efficiency. I have built engines and mechanic for most of my career to include aircraft.
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Old 12-17-2015, 06:07 AM   #16
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JohnRR can you post that pic? it didn't come out here
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Old 12-17-2015, 06:20 AM   #17
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JohnRR can you post that pic? it didn't come out here

Can you see it now ?

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Old 12-17-2015, 06:33 AM   #18
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JohnRR can you post that pic? it didn't come out here



The URL to copy/paste is

*http://www.irv2.com/attachments/phot...4c04e4332.jpg*

without the asterisks **

I copied it from the link in post 10 above.
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Old 12-18-2015, 01:16 PM   #19
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I wouldn't think lag would be a issue, that is as long as the proper turbo's are selected. Shouldn't be to difficult to size a turbo to give max tq from 1,500-4,000 rpm's.

My old Saab had the Swedish version of normalization. Saab claimed 258 ft lb of tq up to 10,000+ feet, they did this by allowing over 20 psi of boost at high elevations or in really hot and humid weather.
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Old 12-19-2015, 08:17 PM   #20
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unless you swap the rods out for forged ones and lower the compression ration of the pistons to 9 or lower, you're liable to throw one right through the crankcase.
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Old 12-20-2015, 06:20 PM   #21
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unless you swap the rods out for forged ones and lower the compression ration of the pistons to 9 or lower, you're liable to throw one right through the crankcase.
Doesn't that depend on the amount of boost (and also the size of the turbo)?

Running a few psi... 5psi or so even with a really large turbo doubt any new internals are needed. Run 15-30psi then yes, lots of internal engine work
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Old 12-21-2015, 11:51 AM   #22
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Why would anybody want to turbo charge an 8.1 in a motorhome?? There is no room to begin with and it is not cost effective. Seems a little odd.
X2,
For the power or fuel saving you might get....Would you live long enough to get a cost recovery based on the average motor home mileage?
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Old 12-21-2015, 06:40 PM   #23
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I don't think cost recovery is a major factor to most of the thread participants

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Old 12-23-2015, 12:47 PM   #24
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The mechanical aspect of turbo charging a gas engined RV would be rather easy, FORD or Chevy. I think the most difficult part would be the engine management and fuel side of the equation. Both applications would certainly need bigger injectors and fuel pumps and ECU tuning.

Turbo sizing would be critical, but staying in the smaller size would aid greatly with Turbo lag. 6-8 PSI on a gas RV engine could ad a considerable amount of HP and torque. And certainly within the design parameters of the engines internal components.
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Old 12-23-2015, 03:42 PM   #25
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Turbo give you more power thru more fuel. More fuel means more polution. More polution means tighter EPA controls on the rest of the fleet. They can only build so many gas hogs.
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Old 12-23-2015, 10:54 PM   #26
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Turbo give you more power thru more fuel. More fuel means more polution. More polution means tighter EPA controls on the rest of the fleet. They can only build so many gas hogs.
Actually, Turbos recover power from the exhaust stream and feed that into the intake stream as boost.

This is what makes a turbo set-up better than a supercharger set-up.

Ford's EcoBoost line of engines are using this principle to post impressive numbers for MPG and power while meeting high EPA standards.

I actually called STS about the turbo set-up in these photos (when gas was at $4 a gallon). They suggested that at 5-7lb of boost, about 50HP and 3-5MPG increase was very doable without any mods to the lower end of the Vortec 8.1L. Too bad STS went out of business...but if/when gas prices go up again, maybe Squires will get another call from me.
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Old 12-24-2015, 07:10 AM   #27
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They suggested that at 5-7lb of boost, about 50HP and 3-5MPG increase was very doable without any mods to the lower end of the Vortec 8.1L.
3-5 mpg increase in a vehicle that at best gets 8? Not possible.
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Old 12-24-2015, 07:16 AM   #28
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If hey were telling people they would get a 3-5 mpg gain then I know why they went out of business . False advertising.
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