Turbo Satoh S373 Beaver III
- Thread starter GrocMax
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Makes 4 PSIg boost just on the hydraulics at full load on the pressure relief, need to finish up some things before it can be pulled outside and have full engine load put on it, but it looks like its going to work just fine.
Just ordered a Chinesium 10 dollar 4 digit LED EGT panel gauge for K type TC in deg F to go along with the boost gauge.
Just ordered a Chinesium 10 dollar 4 digit LED EGT panel gauge for K type TC in deg F to go along with the boost gauge.
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shaeff
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This is very cool, though I haven't posted in here here yet I'm definitely following!
I'd love to put a small turbo on my old Massey Ferguson gasser sometime down the road, just for more power while using the flail mower in really thick stuff. Well, I also love turbos.
Sweet build, keep up the good work!
Edit: post some pics of the whole machine, too! I love this stuff!
Also- I've read some info in the past, be it accurate or not, that for faster spool on turbos a log manifold actually works quite well due to the turbulence it creates before the exhaust turbine. What are your thoughts on that?
I'd love to put a small turbo on my old Massey Ferguson gasser sometime down the road, just for more power while using the flail mower in really thick stuff. Well, I also love turbos.
Sweet build, keep up the good work!
Edit: post some pics of the whole machine, too! I love this stuff!
Also- I've read some info in the past, be it accurate or not, that for faster spool on turbos a log manifold actually works quite well due to the turbulence it creates before the exhaust turbine. What are your thoughts on that?
Turbulence? Hogwash. Shortest runners possible retain more heat, smallest cross sectional area without going too fast retain the most velocity. Turbulence is bad.
Three types of energy are imparted on the turbine wheel- mass flow energy, heat energy, and pulse energy.
A divided scroll can get more of the pulse energy out but it only works up to about 4500 RPM and cylinder count must be even and at least 4. Volvo spent 8 million bucks proving this and wrote an SAE paper on it. This is why divided scroll turbine housings are popular on diesels, you get a little better pulse energy out of it. Divided housings must divide cylinders with the same piston motion, 6 cylinder engine with std firing order of 1-5-3-6-2-4 have pairs of 1+6, 2+5, 3+4, and these are divided to 1+2+3, 4+5+6, each side gets even pulses 240 crank degrees apart.
Ideal would be long tube header with merge collector but 70" long runners to match the 2500 RPM third harmonic are impossible and would kill the heat. Besides cracking all over all the time. Performance improvement would be marginal.
Log style vs tubular style | Turbobygarrett
Schedule 40 304 or 316 stainless weld ells are cheap, properly sized internally, will last forever.
I'll try to get some better pics later, and action vids.
shaeff
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Awesome info, makes me glad I asked your opinion! Thanks!
Last things to finish up are the exhaust and the EGT gauge.
Took it for a quick trip around the lot. Makes significantly more power. Once above about 2200 RPM boost response to load is instant. EGT is low, could use a little more fuel but might just leave it the way it is, ain't gonna break anything at 700F at the turbine discharge.
Took it for a quick trip around the lot. Makes significantly more power. Once above about 2200 RPM boost response to load is instant. EGT is low, could use a little more fuel but might just leave it the way it is, ain't gonna break anything at 700F at the turbine discharge.
Ilikeurtractor
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What's the max boost you're hitting? Congratulations!
Wastegate is 405 mmHg which is about 7.5 PSIg hits it with ease above 2500 RPM as load comes up.
Maybe after running it for awhile and making sure we don't have any issues (overheat etc.) we'll turn the fuel up but for now its staying where it is, power increase was more than anticipated as is, it only has 6" wide tire, don't want to break anything.
Ilikeurtractor
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I'm curious about an analysis of the power increase. My understanding (which may be wrong of course) is without adding more fuel the only way to make more power is with an increase in efficiency which a turbo does, but by what percentage? You state a "significantly more power" which might imply a 50% increase in power? So you might be going from 16.5 hp to 24 hp? That would imply a corresponding efficiency increase of about 50%. Thoughts? Dyno data would be awesome to have here. I know a particular increase for a Mercedes diesel was 50% for their late 70's turbo'd 300D car when from 120 hp to 180 hp with a similar increase in torque. I'm not seeing enough black smoke under normal conditions from my KE70s to get a feel of the inherent factory overfueling that would account for the extra power from a turbo. Just trying to understand the fundamentals and what to expect by addition of a turbo without fueling changes.
The nature of the way it works is significantly more fuel is added automatically when the engine is under load and the rack and barrels move to more fuel position (higher spill port location) from current governor limit position. If the turbo is sized correctly you get boost with load, at governed speed very little boost, under load instant boost increase. The power curve flattens out, HP is maintained under load where before HP decreased and torque stayed nearly constant, now there is a torque rise under load.
