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Suzuki SX4 70 mph , 4000 rpm, is it normal?

26 messages,  Last post on Feb 16, 2009 at 7:56 AM

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What is this discussion about? Suzuki SX4, SUV

Messages Page 3 of 3

#19 of 26 Re: 70mph , 4000rpm, is it normal? [mirlush] by wishbeter

Nov 16, 2008 (5:46 pm)

Replying to: mirlush (Nov 13, 2008 1:24 pm)
I'm only around 2400 rpm at 70. I've had mine since January. AT transmission.
 
I love this car!!
 
-Sean

#20 of 26 Re: MPH/1000 RPM [lamronh49] by mirlush

Nov 16, 2008 (5:52 pm)

Replying to: lamronh49 (Nov 14, 2008 11:05 am)
Thanks for the reply. Very helpful. I've just got one more question, is there overdrive on a manual transmission? I do not think there is, at least I could not find the switch anywhere.

#21 of 26 Re: MPH/1000 RPM [mirlush] by lamronh49

Nov 16, 2008 (10:32 pm)

Replying to: mirlush (Nov 16, 2008 5:52 pm)
You're welcome.
 
Typically 5th (or top) gear is considered the "overdrive" gear. There is no separate overdrive switch/system as was found on cars from the 40s, 50s and 60s.
 
Lockup is the "overdrive" in 4th gear, in the automatic. Again, there is no overdrive system distinct from the lockup in the automatic.
 
Overdrive is a term that has evolved to mean taller/longer than a 1:1 ratio. It doesn't mean what it used to, but the intent and end results are similar.

#22 of 26 RPM by sx4dude1

Jan 30, 2009 (5:21 am)

MY SX4 sedan cruises at 70-75 with no problem right around 2-3,000.

#23 of 26 by lamronh49

Jan 30, 2009 (2:11 pm)

^^ Which is it, 2000 or 3000? Stick or auto?
 
BTW, the SX4 is one of the few modern cars I've checked specs on that does not have an "overdrive" top gear, but rather a 1:1 top in the auto trans.
 
Quite unusual, most cars have about a .7:1. Wonder what guided their thinking on this?

#24 of 26 Re: RPM [sx4dude1] by nace818

Feb 04, 2009 (6:25 am)

Replying to: sx4dude1 (Jan 30, 2009 5:21 am)
Checked mine this morning. I have a 5 speed manual. As close as I can read the tach
60 = 2650, 70 = 3000, 80 = 3750 rpm. For comparison, are automatics about the same ?

#25 of 26 by lamronh49

Feb 04, 2009 (1:05 pm)

The automatics run about 27 MPH/1000 RPM in top gear.
That means they run 3,000 RPM 81 MPH. Which equals appx. 2600 70, and 2200 60.
Easy if you have a calculator.
 
By comparison, your manual runs 23.3 MPH/1000 RPM in top gear, doing the math on your numbers.

#26 of 26 Re: [lamronh49] by machell

Feb 16, 2009 (7:56 am)

Replying to: lamronh49 (Jan 30, 2009 2:11 pm)
I was thinking it probably has something to do with optimising the car for speeds 0-70mph. All the ratios are lower than I expected and the revs consequently higher for a given speed. A 6 speed would be great. The car is quite quick around town and top gear is good for the majority of high speed hills, in this regime it makes sense as there is less downshifting and more convienent. The city by vw has similar ratios.

Messages Page 3 of 3

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