looking for turbo suggestions...

"JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t" (jawzx2) 09/14/2016 at 12:29 • Filed to: None

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Since I spent all my mad-money on a practical tractor and attactchments instead of a Traction Avant, I’m looking to at least make it an interesting project tractor...

I have mentioned this before, but I really think I want to turbo-charge it.

29HP, 1.5l, 3cyl, 12-valve, OHV, mechanical-injected Shibuara diesel.

it’s pretty tightly packaged in there...

I’m looking to keep boost at 5-7PSI max (factory compression ratio is 23:1, and I want reliability to still figure heavily into this build), and for it to be fully spun up at 2200 RPM. I have the shop manual for the injection pump, and unlike many, it can be adjusted without disassembly!

I have forum proof that a Saab 2.3t turbo can provide 5 pounds of boost from this engine, and that it dynos at over 45 PTO horsepower with that arrangement, however it required 2800 RPM to reach that boost and power level. 540RPM on the PTO with the stock gears happens at 2300 RPM, so I’d love to be making ~5PSI at 2200-2400 RPM, rather than having to wind it out to 2800 (haha, diesels...) to spin up that boost...

Saab 2.3t fitted to Ford/Shibaura 1720. Note relocated air cleaner.

Forum Guy has been running that power and boost for several years, nearly 1500 hours, without issue, but he doesn’t run any implements that are picky about input RPM, I’m hoping to run a baler, and they like to run pretty close to spec, or Bad Things can happen.

that little 1.5l 3cyl is practically dwarfed but the giant Saab turbo... (there *IS* room in front of the radiator between the battery, intercooler?)

Those of you with turbo knowlege: any suggestions for a donor turbo?

I’d love to cobble in a tiny intercooler too... was thinking 500-Abarth OEM intercooler from someone who swapped to a single-front-mount.

eBay image of a $50 500 Abarth intercooler...

Then it could get ST badges and all my Ford products would match ;)

Snuze: Needs another Swede > JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t 09/14/2016 at 12:48

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I believe, from a minute of furious googling, that the Saab 2.3T came with a TD04 series turbo. Those flow about 26.7 lb/min so you need to go smaller than that.

There’s a much more scientific way to do this (reading turbo maps) but that should at least get you in the ballpark.

jimz > JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t 09/14/2016 at 12:50

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$85 at AutoZone.

jimz > JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t 09/14/2016 at 12:51

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since editing is broken:

$85 at AutoZone

JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t > jimz 09/14/2016 at 13:03

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in all seriousness, been thinking about a bigger alternator too... Factory unit is only 40amp.

Snuze: Needs another Swede > JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t 09/14/2016 at 13:03

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Garrett has a turbo calculator for Android/iPhone/web and its suggesting a GT 1241, 41mm, 50 Trim, 0.33 A/R. This turbo was used on some of the european VW Gol/Parati 1.0L Turbo engines.

This will put you at around 70% efficiency with 1.5 pressure ratio. This turbo can run up to 76%, and likes to be closer to 2.0, but you’re not too far outside of it’s operating range. Anyways, this should get you close to 50hp at your ideal RPM.

Id recommend downloading it and playing around some.

Demon-Xanth knows how to operate a street. > JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t 09/14/2016 at 13:09

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JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t > Snuze: Needs another Swede 09/14/2016 at 13:16

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cool! Didn’t know that existed!.

Snuze: Needs another Swede > JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t 09/14/2016 at 13:19

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Right, since it’s Garrett it only pimps their products, and there are lots of other options out there (Tubronetics, VF, IHI, etc.).

Looking at the map for the 1241, it’s a very small turbo, a fair bit smaller than the TD04. In your application it’s only pushing about 5-6 lbs/min airflow. So what you could do is look for other turbo maps that will put you in the same airflow range at a similar pressure ratio at a higher efficiency.

Jordan and the Slowrunner, Boomer Intensifies > JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t 09/14/2016 at 15:53

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FiST turbos apparently work on Miatas, and those are fairly small.

JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t > Snuze: Needs another Swede 09/14/2016 at 17:34

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looks like the IHI RHB31 is used in several small diesels, including a 3 cyl, 1.5l Yanmar engine that’s rated at 47HP. the RHB31 (and it’s clones) are all over eBay like spilled rice on a shipment from China.

At my flow rates it is right in the sweet spot of it’s operating parameters...

Now, used Kei turbo from Japan, or new Chinese clone? How stupid would buying a cheap Chinese be?