Calculator: gear ratio, tire size, speed, etc.

[Jtphoto]

Thanks @AnnDee4444 for a ratio chart that actually makes sense.

I’ve been trying to find a decent tire/gear/rpm chart, like we have for the JKs, for a fellow Jeeper but can’t believe how many sites are passing around old D44 or JK charts as JL/JT charts. Even some notable parts shops. They are not even close and don’t even post the appropriate JL gear ratios let alone the proper RPM. No way a JL on 35s and 4.56 cruises at 65mph at 2800rpm.

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[Jtphoto]

One more point of interest:
Out for a drive today and recorded the actual live data..
70mph @ 2000rpm in 8th gear, 4.56 gears on 37” tires.

 

[Ratbert]

Those are slick charts / calculators @AnnDee4444 . Would it be painful to add torque details for some of the other engines out there? E.g. EcoDiesel / 4xe / 392?

 

[AnnDee4444]

Those are slick charts / calculators @AnnDee4444 . Would it be painful to add torque details for some of the other engines out there? E.g. EcoDiesel / 4xe / 392?

I can probably do the EcoDiesel easily (well easier...), but I should find more dyno plots to get a good average (there weren't many available for the 3.0 in 2020). See these threads for the averages that I'm referring to: 3.6, 3.0, 2.0. I also still need to do the 392 curves, and I've never even seen a 4xe dyno chart... but it would be cool to get one for all electric vs. hybrid.

 

[AnnDee4444]

Looked into 4xe dyno charts today... there's not much available. This one came from here. Note: youtube link is in newton-meters (orange line), which I converted to lb.ft., so the charts won't look the same

I'm not sure I trust these numbers tough, and I still need to average in the two charts in the links below. The 2nd one is really annoying and I might skip it... the top of the torque graph is cut off, and I'd have to calculate it based off of the HP.
https://www.br-performance.be/en-be...jeep/1374-wrangler/10452-2018/12591-2-0t-4xe/
https://www.4xeforums.com/threads/3208/?post_id=40503&nested_view=1&sortby=oldest#post-40503

The blue "Average 2.0" curves are from here.

 

[Jtphoto]

Excellent. I haven’t seen any dyno charts at all comparing the eTorque and non eTorque versions of the 3.6 or 2.0 either. Not sure on the 2.0 but the 3.6 is suppose to have 90ftlbs of torque over the non etorque version.

 

[AnnDee4444]

Excellent. I haven’t seen any dyno charts at all comparing the eTorque and non eTorque versions of the 3.6 or 2.0 either. Not sure on the 2.0 but the 3.6 is suppose to have 90ftlbs of torque over the non etorque version.

2.0 is supposed to be 70 lb.ft. (and the non-Jeep HEMI is 130 lb.ft.). My guess is it is sized somewhat based off of the engine's rotating mass.

From what I recall, eTorque cuts out pretty low (like 1500 RPM). I'm lucky to find a dyno chart that even goes that low, and even then I would question it's accuracy as I've heard never to trust the initial tip-in on a dyno (there's probably a different term for this).


Some links:
https://www.continental.com/en/press/press-releases/2019-01-16-jeep/

https://transistor-man.com/everything_etorque.html

 

[Jtphoto]

The etorque does cut in at higher rpm as well when towing or climbing hills.
That being said it would show up in a 0-60 time.

 

[AnnDee4444]

The etorque does cut in at higher rpm as well when towing or climbing hills.
That being said it would show up in a 0-60 time.

I'm not sure it's ever adding torque when already rolling though, so I don't think it would show up in a dyno chart.

What would really be interesting is to see when eTorque is active vs. torque converter slippage.

 

[GrayWolf.Overland]

Looked into 4xe dyno charts today... there's not much available. This one came from here. Note: youtube link is in newton-meters (orange line), which I converted to lb.ft., so the charts won't look the same

I'm not sure I trust these numbers tough, and I still need to average in the two charts in the links below. The 2nd one is really annoying and I might skip it... the top of the torque graph is cut off, and I'd have to calculate it based off of the HP.
https://www.br-performance.be/en-be...jeep/1374-wrangler/10452-2018/12591-2-0t-4xe/
https://www.4xeforums.com/threads/3208/?post_id=40503&nested_view=1&sortby=oldest#post-40503

The blue "Average 2.0" curves are from here.

Very cool.. this explains why a light 37 tire on my 4.10 geared 4xe feels much peppier than my previous 3.6 v6 jeep on 35s and 4.56 gears. I did not feel that I would need regear even if I ran a heavy 37.

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