3.6 Torque Curves

AnnDee4444

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I've was wondering how all the aftermarket baseline dyno curves compare to each other, and found a neat website that lets you convert images into CSV data www.graphreader.com. So with some work, I've collected some baseline 3.6 dyno charts and plotted them out together.

Some observations:
  • automobile-catalog.com provides engine torque that has been estimated by a computer. I'm not sure how they do this, but I found that factoring 85% for drivetrain losses puts it about in the correct spot. Unfortunately the curve doesn't really match all the other data.
  • Some plots don't look accurate below certain RPMs, and should probably be ignored
  • not all dynos measure power equally
3.6 Stock Torque Curves.png


Sources:
Update: I did my best to get a realistic average of all the curves. The max torque is about 210 lb-ft, with above 190 lb-ft from 2250-5250. This is equal to roughly 19% drivetrain loss from the published 260 lb-ft at the crank. Here's what I took into consideration when making this average:
  • Ignored the computer generated data from automobile-catalog.com
  • Ignored the unrealistically steep sections at the beginning & ends of some of the pulls (ExtremeTerrain.com's & K&N)
  • Smoothed out minor bumps & dips from where certain data starts & stops
3.6 Stock Torque Curves.png





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track.n.trail

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Very interesting, thanks for compiling this!
 
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AnnDee4444

AnnDee4444

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Below is the data for my estimated average. It was originally broken down in 10 RPM increments, but I've found it's much easier to deal with 100 RPM increments and still accurate enough.

RPMTorque
150050
1600116
1700160
1800164
1900167
2000174
2100181
2200188
2300197
2400204
2500207
2600209
2700207
2800205
2900207
3000208
3100204
3200201
3300199
3400198
3500198
3600200
3700201
3800202
3900203
4000201
4100198
4200197
4300191
4400192
4500194
4600194
4700195
4800196
4900197
5000197
5100197
5200196
5300195
5400194
5500193
5600193
5700194
5800194
5900194
6000194
6100192
6200189
6300186
6400176
6500164
6600154
6700106
 

JLTruman

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This is interesting data and not sure this is relevant scientifically, but imo where the torque curve is healthiest is also where the engine sounds best. I have an injen intake and dynamax muffler delete.
 
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AnnDee4444

AnnDee4444

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Below is the data for my estimated average. It was originally broken down in 10 RPM increments, but I've found it's much easier to deal with 100 RPM increments and still accurate enough.

RPMTorque
150050
1600116
1700160
1800164
1900167
2000174
2100181
2200188
2300197
2400204
2500207
2600209
2700207
2800205
2900207
3000208
3100204
3200201
3300199
3400198
3500198
3600200
3700201
3800202
3900203
4000201
4100198
4200197
4300191
4400192
4500194
4600194
4700195
4800196
4900197
5000197
5100197
5200196
5300195
5400194
5500193
5600193
5700194
5800194
5900194
6000194
6100192
6200189
6300186
6400176
6500164
6600154
6700106
...and the resulting wheel HP curve using the estimated/averaged torque.
chart.png
 
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AnnDee4444

AnnDee4444

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This is interesting data and not sure this is relevant scientifically, but imo where the torque curve is healthiest is also where the engine sounds best. I have an injen intake and dynamax muffler delete.
I was doing calculations using the estimated data from www.automobile-catalog.com, and always had doubts about it's accuracy. Drivetrain efficiency was another unknown. Averaging real dyno runs should give me the most accurate results and removed the need to calculate the drivetrain efficiency.

It's also interesting to see how the aftermarket's claimed gains compare to each other. 10 HP from one company does not equal 10 HP from another company if their dyno reads 25% high.
 
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Mfarr75

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...and the resulting wheel HP curve using the estimated/averaged torque.
chart.png
I must say, I am a happy owner of the 3.6, but man the TQ and HP of the engine kinda suck on paper, number wise, especially in the 2000-4000 range where the 8 speed auto tries to keep the truck during most driving (2000 most times on mine unless I get on it). Peak HP at 6000 rpm's is not much use to me in a Jeep.

Now, I know the curve is nice and steady, flat, etc., but it just seems a decent V6 in 2021 should be more like 300 HP and something close on TQ at the crank, and in the more usable portion of the rev range. That would be like 255 HP at the wheel more or less. Oh well.

I never can understand why, same engine with a different intake, maybe ECU programming on another FCA product like the Challenger or Ram is 305 HP. Why neuter the Wrangler like that?
 

blnewt

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I like the Pentastar for the most part, after 4500 rpm it seems to really fall off though. For what I use the JL for it's a great motor, but it does sound like ass vs. the sweet sound from our VQ3.7 on our Infiniti :)
 

Strommen95

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No source. It’s common knowledge. Perhaps the engineers discussed it in a video somewhere. The Wrangler Pentastar makes less power than any other Pentastar. That’s not by accident.
 

BlackGenesis

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I must say, I am a happy owner of the 3.6, but man the TQ and HP of the engine kinda suck on paper, number wise, especially in the 2000-4000 range where the 8 speed auto tries to keep the truck during most driving (2000 most times on mine unless I get on it). Peak HP at 6000 rpm's is not much use to me in a Jeep.

Now, I know the curve is nice and steady, flat, etc., but it just seems a decent V6 in 2021 should be more like 300 HP and something close on TQ at the crank, and in the more usable portion of the rev range. That would be like 255 HP at the wheel more or less. Oh well.

I never can understand why, same engine with a different intake, maybe ECU programming on another FCA product like the Challenger or Ram is 305 HP. Why neuter the Wrangler like that?
Yes, 3.6 engine makes low power compares to what others make now days.
Infinity/Nissan or Hyundai v6 engines (3.7, 3.8) are making 330 - 350 hp and 280 - 295 torque, crank.

Nevertheless, tuning can unlock good amount of power on a Jeeps engine .

Screenshot_20201217-064752_Chrome.jpg
 

Mfarr75

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I like the Pentastar for the most part, after 4500 rpm it seems to really fall off though. For what I use the JL for it's a great motor, but it does sound like ass vs. the sweet sound from our VQ3.7 on our Infiniti :)
I had a 350Z with the 3.5 V6 (earlier verison of same engine basically) and I know exactly what you mean about the sound. Bone stock, It was throaty and had a very cool deceleration noise. Not ricey at all. I don't know how Nissan/Infiniti engineers did such a good job on exhaust note, but they have nailed it better than most manufacturers. I used to love being inside a parking garage and listening to the exhaust noise when I went up and down the ramps.
 
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Mfarr75

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Yes, 3.6 engine makes low power compares to what others make now days.
Infinity/Nissan or Hyundai v6 engines (3.7, 3.8) are making 330 - 350 hp and 280 - 295 torque, crank.

Nevertheless, tuning can unlock good amount of power on a Jeeps engine .

Screenshot_20201217-064752_Chrome.jpg
I agree completely that tuning can help the 3.6. The problem is the factory and any extended warranty is toast at that point if you have engine issues (because of course FCA will blame everything on the tune. It's a slam dunk denial for them).

I am curious if there is extra HP/TQ readily available, why doesn't FCA send it out of the factory like that. You would think Jeep would want to be able to advertise the best possible numbers for its engines. I have to assume its either some kind of weird politics, such as needing sportier products like the Chargers/Challengers have more power OR maybe the engineers concluded the engine will not be reliable enough long term if they pushed the power envelope.
 

jdubya421

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I had a 350Z with the 3.5 V6 (earlier verison of same engine basically) and I know exactly what you mean about the sound. Bone stock, It was throaty and had a very cool deceleration noise. Not ricey at all. I don't know how Nissan/Infiniti engineers did such a good job on exhaust note, but they have nailed it better than most manufacturers. I used to love being inside a parking garage and listening to the exhaust noise when I went down up and down the ramps.
I wish more Z owners would pony up for nice exhaust. I don't think I have ever heard a Z that didn't sound like a fart. My 3.6 sounds a bit Civic-y, but I still like it.
 

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