3.0L Diesel Dyno

AnnDee4444

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oceanblue2019

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The Audi 3.0L Diesel was the same from the factory with a super flat torque curve. It was fantastic in the heavy Q7. I suspect this new engine in the Jeep will be a lot of fun to drive, if it proves to be reliable.

I suspect a tune will unlock a lot more, at the risk of transmissions and transfer cases which are probably why they are limiting in the first place.....
 

BigGreen

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I suspect a tune will unlock a lot more, at the risk of transmissions and transfer cases which are probably why they are limiting in the first place.....
It’s the same 8 speed as the 6.4 Hemi, isn’t it? Should have some headroom still.
 
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AnnDee4444

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It’s the same 8 speed as the 6.4 Hemi, isn’t it? Should have some headroom still.
I suspect that it's actually the axles that are the limiting factor. As far as I know, all diesel JLUs are getting Dana 44 axles. From Jalopnik: https://jalopnik.com/americas-first-ever-diesel-jeep-wrangler-is-the-torquey-1839766068

Speaking of differentials, all JL diesels regardless of trim receive the 220 mm rear axle ring gear and the 210 mm front ring gear normally reserved for Rubicon trims on gas variants. Non-Rubicon gas Wranglers have a 186 mm ring gear up front and 200 mm ring gear out back. (Plus, gas Wranglers are offered with various axle ratios, while the EcoDiesel gets 3.73 gearing across all trims).
 

oceanblue2019

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It’s the same 8 speed as the 6.4 Hemi, isn’t it? Should have some headroom still.
Good point on the transmission, so only the transfer case is at risk of being the sacrifice to the gear-gods.
 

ptoemmes

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I suspect also why the gearing is 3.73 in the diesel instead of 4.10 as in the gas. I imagine you might be able to pop a wheelie in 2wd just before you grenade your rear diff with 4.10s.
 

JMatt

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You can see the obvious software limit to torque from 1400 to 2800 rpm. A tuner should get Peak torque up to 500 pretty easily with no other mods.

And the nose is too heavy for 2wd wheelies. But who's with me on a 4wd wheelie in reverse?
 
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I suspect also why the gearing is 3.73 in the diesel instead of 4.10 as in the gas. I imagine you might be able to pop a wheelie in 2wd just before you grenade your rear diff with 4.10s.
So that is why the 2-door isn't getting the diesel. Uncontrollable wheelies.
 

Almost

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You can see the obvious software limit to torque from 1400 to 2800 rpm. A tuner should get Peak torque up to 500 pretty easily with no other mods.
The motor is detuned by 40tq compared to it's RAM 1500 counterpart.
 

rubileon

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I suspect also why the gearing is 3.73 in the diesel instead of 4.10 as in the gas. I imagine you might be able to pop a wheelie in 2wd just before you grenade your rear diff with 4.10s.
No. When the number is lower, there is more strain. The diesels get 3.73 is because diesel RPMs are lower. Even the export 2.2 diesel gets 3.73 and it doesn't have as much torque.
 

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AnnDee4444

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I didn't read the methodology but looks like the values are scaled to match billed power and torque figures (at the crank). In other words, I find it difficult to see how these are actual values at the wheels when they are an exact match with crank figures.
These are estimated crankshaft numbers. I have no idea what data they started with, or if it is accurate.
 



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