 | Home > Puma (Tdci) > Optimum rpm range for road driving with the Puma engine |
 
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| ericvv Member Since: 02 Jun 2011 Location: Near the Jet d'Eau Posts: 5816   
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Cruising on a long flat road... That means in 6th gear. Mine feels perfectly at ease to do that at anything between 60kph and 120kph, that means between 1250 and 2500 rpm. Get a feel for the engine, you should be able to hear and feel what is comfortable for it.
Eric You never actually own a Defender. You merely look after it for the next generation. http://youtu.be/yVRlSsJwD0o https://youtu.be/vmPr3oTHndg https://www.youtube.com/watch?v=_GtzTT9Pdl0 https://www.youtube.com/watch?v=ABqKPz28e6A https://www.youtube.com/watch?v=rLZ49Jce_n0 https://www.youtube.com/watch?v=XvAsz_ilQYU https://www.youtube.com/watch?v=K8tMHiX9lSw https://m.youtube.com/watch?v=dxwjPuHIV7I https://vimeo.com/201482507 https://www.youtube.com/watch?v=ZSixqL0iyHw |
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27th Mar 2016 7:01am |
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| Riccarton Member Since: 10 Aug 2015 Location: Gods' Own Country Posts: 280  
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As ericvv says. they have quite a wide rev range - not like an older type diesel which very much had a "sweet spot".
A good quality remap will still help to make it feel less restrained though. From an economy point of view keep below 2000rpm but better still forget economy and just enjoy it  |
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27th Mar 2016 9:32am |
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| rossy Member Since: 29 Nov 2010 Location: Co. Roscommon Posts: 1296  
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I find with a 2.4 that 2000 - 2200 is the ideal 'accomplish anything' slot whether towing or cruising. Its all downhill after that !
Above 3000rpm is just pants - all noise and no action IMHO although the odd Italian tune up clears the cobwebs and is fun  |
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27th Mar 2016 9:45am |
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| Supacat Member Since: 16 Oct 2012 Location: West Yorkshire Posts: 11018  
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1,250rpm in 6th sounds too low to me, I'd be dropping down to 5th well before that. 6th gear is an overdrive and whilst it may not sound laboured, I'd be wondering what the fuelling strategy would have to try and do if you put more than a modicum of throttle. For the 2.2 JLR quote that 90% of peak power is available between 2,200 and 4,350prm with max figures of 122PS@3,500rpm & 360Nm@2,000rpm. |
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27th Mar 2016 11:25am |
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| Alien Member Since: 18 Jan 2015 Location: Bacchus Marsh Posts: 230 
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Some of what I've found after a few trips usually towing @1200Kg of Tvan...
I find that at 95-100Km/h(just over 2'000rpm) on level or slight undulating road is the happy spot. Under 90Km/h(under 2'000rpm) I'm dropping out of 6th and it makes for a tiresome trip. In the hills I crank it up to the legal 110km/h(@2200rpm) and find I'm passing folk up hill. I can't find the figures quickly but IIRC peak torque is 2'000rpm so if the turbo is spooled up just above this it holds on better. (figures posted while 'ol fat fingers was doing this, thanks Supacat). I also find I'm get to 2'800rpm in the higher gears when on the way up the box for best changes with the van on, around 4ton GVM. Cheers, Kyle. |
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27th Mar 2016 11:28am |
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| ericvv Member Since: 02 Jun 2011 Location: Near the Jet d'Eau Posts: 5816
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You say it there, we talk about cruising on flat roads, which means no more than a slight constant push on the throttle to keep it steady at 60kph, and if needed to speed up from there no real power demand to accelerate more than just oh so smoothly. The Puma sounds pretty happy to do that. If I would need to speed up at anything more than I feel the engine feels comfy with, I immediately switch back to 5th. Seems to work for me, just feel sorry for all those frustrated drivers behind me who find that I am not getting out of the starting blocks fast enough. Can't care less actually. 
Eric You never actually own a Defender. You merely look after it for the next generation. http://youtu.be/yVRlSsJwD0o https://youtu.be/vmPr3oTHndg https://www.youtube.com/watch?v=_GtzTT9Pdl0 https://www.youtube.com/watch?v=ABqKPz28e6A https://www.youtube.com/watch?v=rLZ49Jce_n0 https://www.youtube.com/watch?v=XvAsz_ilQYU https://www.youtube.com/watch?v=K8tMHiX9lSw https://m.youtube.com/watch?v=dxwjPuHIV7I https://vimeo.com/201482507 https://www.youtube.com/watch?v=ZSixqL0iyHw |
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27th Mar 2016 12:18pm |
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