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  #1  
Old June 13th, 2014, 08:21 PM
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diesel exhaust tuning

Can too small of an exhaust cause lower performance and temp increases in the engine? I know nothing of diesel tuning or exhaust anything.
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  #2  
Old June 13th, 2014, 08:29 PM
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Absolutely. Free flowing exhaust is paramount to diesel engine health and performance.

Let her breathe.
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Old June 13th, 2014, 08:30 PM
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Quote:
Originally Posted by mgreenspan View Post
Can too small of an exhaust cause lower performance and temp increases in the engine? I know nothing of diesel tuning or exhaust anything.
Especially on a damn Rover. Some of the most restrictive exhausts ever made....
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  #4  
Old June 13th, 2014, 08:40 PM
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Yeah. I randomly had a piece of the mid section fall off mine the other day. Took it to the only place I trust in rinky dink Columbus, Midas. The owner is awesome and he built me a new exhaust and was able to do it from the manifold. It is 2.5 inches the entire way now. It used to be a hodge podge of the old V8 exhaust and who knows what that was around and what was left over from the RRC the engine conversion came from. It sounds good and honestly the truck felt like it had slightly more power and I'm convinced the temp needle was slightly lower. I'm going to drive it at the hottest point of the day tomorrow to see.

I really know nothing about performance anything and am probably doing myself a disservice. I think part of the old exhaust was probably 1 7/8" at some points. Big difference.
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Old June 13th, 2014, 09:44 PM
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It must be true then.
Around my neck o' the woods, all the high-school boys with pickups have two 6" stacks straight up outta the beds of their diesels!


.
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Old June 14th, 2014, 12:54 AM
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Quote:
Originally Posted by mgreenspan View Post
Can too small of an exhaust cause lower performance and temp increases in the engine? I know nothing of diesel tuning or exhaust anything.
The definition of "too small" depends on the maximum horsepower output.

Rover I4 diesels make less horsepower than a honda fit and you know how small those exhausts are. Anyone who has tried to increase their Honda Fit's horsepower with a larger exhaust knows how futile that is.
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Old June 14th, 2014, 08:40 AM
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Yeah yeah. It's a 3.5 liter diesel engine, though. 135 hp supposedly. I like calling the Fit the Fist.
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Old June 14th, 2014, 08:48 AM
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Mandrel bends make all the difference
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  #9  
Old June 14th, 2014, 08:54 AM
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2.5 to 3.0 inch with mandrel bends would be great to let that diesel breathe. I've got a 3.9 turbo diesel with 3 inch open exhaust all the way back. The turbo takes most of the noise out of it.
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Old June 14th, 2014, 09:15 AM
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Quote:
Originally Posted by sonoronos View Post
The definition of "too small" depends on the maximum horsepower output.

Rover I4 diesels make less horsepower than a honda fit and you know how small those exhausts are. Anyone who has tried to increase their Honda Fit's horsepower with a larger exhaust knows how futile that is.
Has more to do with engine design and type than bhp output. Some gasoline engines run better with back pressure from the exhaust where no diesels do, power is lost pushing gasses through.
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  #11  
Old June 14th, 2014, 09:29 AM
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I'd have to get different exhaust manifold which is beyond the scope of reasonable modifications for this truck. It was 2.5 inch off the back end of the manifold so he was able to keep it at that the entire length and tucked away just like before.

I honestly hadn't put much thought into it since the exhaust on the original conversion was not anything huge. And like I said I know nothing about anything when it comes to tuning. I can turn wrenches and hit parts with hammers until they work.
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