City cruising gear - Dodge Challenger Forum: Challenger & SRT8 Forums
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post #1 of 22 (permalink) Old 05-01-2019, 10:36 PM Thread Starter
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City cruising gear

So I’ve noticed the gearing in my RT is a lot longer than my mustang was. I could cruise around town in 35mph zone in 5th without the RPM’s getting below 1500 and having to downshift. I have a general rule that if you get over 2000 shift, if you get below 1500, shift. So I’ve been riding around town around 35-40 in 4th. What gear do you all use for city traffic? Never had V8 before this car and I’m learning it’s very different mechanically than all my other cars, which were all boosted 4’s.
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post #2 of 22 (permalink) Old 05-02-2019, 03:27 AM
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If I’m not going to need power for anything I use 1100-1200 rpm for a cruise decision. I’ll go higher if I have to combat drive by lane changing and accelerating.
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post #3 of 22 (permalink) Old 05-02-2019, 05:18 AM
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post #4 of 22 (permalink) Old 05-02-2019, 05:51 AM Thread Starter
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Haha. Ok shoulda said this was for the M6 owners only lol. 1100-1200 doesn’t bog the motor down too bad? That was like about to stall out RPM’s in my last cars. Sluggish for sure.
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post #5 of 22 (permalink) Old 05-02-2019, 06:14 AM
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Going below 1500 is no problem with the torque of the 5.7L. When I had mine (M6) I would often skip shift and do 1-3-5 if I was just cruising around taking it easy, at 35 that's about 1200 at 40 almost 1400, no issues there. The automatic if you had it would be about those same rpms or less at the same cruise. Just obviously don't try to accelerate hard from such a low rpm in 5th, that would be lugging but easy cruise at low rpms won't hurt a thing.

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post #6 of 22 (permalink) Old 05-02-2019, 06:57 AM
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I'm looking for 1,500 - 2,000 rpm at cruise.

Below 1,500 rpm and unless on a level road - you're not going to have much torque if traffic slows down, then picks speed back up w/o a downshift

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post #7 of 22 (permalink) Old 05-02-2019, 07:42 AM
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Forming an opinion on what is/is not bogging the engine would easier if we had oil pressure gauges.

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post #8 of 22 (permalink) Old 05-02-2019, 07:54 AM
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If I'm cruising at 35, I'm in 4th.
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post #9 of 22 (permalink) Old 05-02-2019, 08:29 AM
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Around my area the roads are very flat. When I first bought my RT I would cruise around town in 6th gear which was 42mph @1000rpm...of course if I need to accelerate I drop down to 3rd. In fact, my shift pattern was 1, 3, 6 during my commute to work. Most folks will say that is way too low of an RPM but skip shift (stupidest invention ever BTW) forces you to shift from 1st to 4th and your RPMs drop to around 1200.


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post #10 of 22 (permalink) Old 05-02-2019, 08:53 AM
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Quote:
Originally Posted by AttackHelicopter View Post
So I’ve noticed the gearing in my RT is a lot longer than my mustang was. I could cruise around town in 35mph zone in 5th without the RPM’s getting below 1500 and having to downshift. I have a general rule that if you get over 2000 shift, if you get below 1500, shift. So I’ve been riding around town around 35-40 in 4th. What gear do you all use for city traffic? Never had V8 before this car and I’m learning it’s very different mechanically than all my other cars, which were all boosted 4’s.
Years ago when I was first learning to drive a car equipped with a manual -- my prior experience was with automatic equipped cars and manual transmission equipped motorcycles so I was just having to master the clutch operation and manual transmission aspect of the car -- I asked my brother in law (from whom I had bought the car with the manual transmission) and he said what he used was: 1st gear for speeds 10 mpg and below; 2nd gear for speeds in the 20mph range; 3rd gear for 30mph speeds; 4th gear for 40mph; 5th for 60mph; and 6th for higher speeds.

Really since most often one is having to drive at a posted limit and the limits are (generally) 10mpg, 15mph, 20mph, 25mph, 30mph, 35mph, 40mph, 45mph and so on 1st gear for any speed between 1mph and 19mph, 2nd for any speed that starts with a 2, 3rd for any speed that starts with a 3, and so on.

Or another way of looking at this is under "normal" operation I prefer to keep the RPMs between around 1500 to 3000. In lower gears I might even let the RPMs dip below 1500 (but not much below; really if the engine gets operated much below 1500 it only sees this low of an RPM in 1st gear) and under acceleration I often take the engine RPMs above 3K.

To 1) avoid possibly lugging the engine; and 2) to have some margin of acceleration available; I prefer to use a gear that at the desired speed means the engine is not at the very bottom of its usable RPM band but a bit above it, so I don't have to downshift if I need to accelerate any. I'm not talking about an emergency acceleration event just the normal acceleration that is very common when operating a vehicle in normal traffic with the normal variation of speed one experiences as one strives to keep up with traffic or avoid getting too close to the vehicle ahead when other vehicles slow down a bit.
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