Anyone else have a real lazy gear change in the V6 ? ..the power is great but it just seem to be playing up gear change wise :?
Lazy Gearbox V6 DCI ??
GD1
1 - 20 of 35 Posts
Joined
·
4,597 Posts
I reckon its all nissan/renault auto's. The petrol auto's are ok, mine is not the V6 but it is slow as fook to change imo. Does the V6 rev high still going up small hills when it should be using the torque? and apart from that how do you rate it?
I know navara1 got rid of his as he couldnt get on with the auto doing what it wanted.
I know navara1 got rid of his as he couldnt get on with the auto doing what it wanted.
Joined
·
2,159 Posts
the one i got at the mo is ***** ...reminds me of a riding in an old Ford Granada taxiWarpa said:
ale: its fast but no quicker than a 176 or 190 bhp off the mark ,the slow change is a joke ...it ent right i am taking it in to Nissan Monday .
Joined
·
4,597 Posts
Mate i think you will find them all like that, i love auto but that was with a big petrol lump, i dont think oil burners are made for it, makes them rev like a petrol and use no torque. The Isuzu petrol autos i could make change gear using the lever, the nissan one does what it wants, hit the 4.5k revs and 10 mins later it will change gear :lol:
Post how you get on and what they say :thumbright:
Post how you get on and what they say :thumbright:
Joined
·
4,542 Posts
Warpa, i've found that if you accelerate gently it does hold the gears for an eternity. If you give it sort of mid throttle mine goes through the gears quite quick and never goes above 2500RPM maybe a bit more.
I also found that the DTE PDi and CRD could be set to lower the power (or least it felt like it) down the rev range.
I was using map 1+10 on the PDi and Map 1 0 on the CRD unit. This seemed to give the most torque IMO, On the motorway it would lock into 5th and be able to hold it there from 60Mph upwards and allow quite hard acceleration.
I also found that the DTE PDi and CRD could be set to lower the power (or least it felt like it) down the rev range.
I was using map 1+10 on the PDi and Map 1 0 on the CRD unit. This seemed to give the most torque IMO, On the motorway it would lock into 5th and be able to hold it there from 60Mph upwards and allow quite hard acceleration.
Joined
·
4,597 Posts
NNPUT said:
Ill try that setting today :thumbright:
If that is true i bet if you floor the 350 from stand still it it wont hold for 3 seconds before pulling away, every auto i have previously used i used to love stamping on the loud pedal at the lights, its like launch control :mrgreen:Andy said:
Joined
·
23,576 Posts
I suppose the thing that many tend to overlook is, the fact that these trucks are just that, trucks!
They weren't meant to compete with performance cars, otherwise they'd have much better brakes, having said that, with a DTE they don't hang about :shock: :wink:
They weren't meant to compete with performance cars, otherwise they'd have much better brakes, having said that, with a DTE they don't hang about :shock: :wink:
Joined
·
4,597 Posts
I really have to beg to differ with the arguements trying to say the nav auto box is normal (for the nav perhaps it is) but as auto's go i think it could be ten times better.
Isuzu Trooper 3.5 V6 Citation with an auto box was a second quick from 0-60 than the manual (i had both) The auto i could use like a manual which meant if i moved the lever it would over ride what the auto wanted and go into the gear i selected, so if i were doing 50 mph and was waiting for a gap to overtake as soon as the was a gap i could knock it down a gear and was gone! if i let the box do it i had a small wait, loads of revs and then it went.
From the lights you could stamp the pedal into the carpet and upto about 40 mph only the fastest road cars would keep up, no lag at all and i mean NO lag. This is from a gear box probably 20 years old now. The box in the nav reminds me of an auto Rover my mrs had (was it a rover metro? little two door thing like the mini metro) too long ago to remember, but it had a synquential auto box, my non mechanical explanation of it is that the plates would have to reach a spin point fast enough for the plate to engage the gear (this also feels a lot like the navara auto to me) its like they are using a similar setup. This could be a cost cutting exersise either in the box or on the extreme stress it can cause on the running gear.
I also had an Opel Manta 2.3 auto, again pulling away from the lights the back end would drop and it would launch away, as did my mates 2.3 V6 cortina :lol: These are all uato boxes from yesteryear, so today they should be lightning quick. I also remember reading a review on the trooper auto on how it seemed to remember and adjust to your driving style, drive economical and it changed at low revs, the nav has a mind of its own :shock:
Isuzu Trooper 3.5 V6 Citation with an auto box was a second quick from 0-60 than the manual (i had both) The auto i could use like a manual which meant if i moved the lever it would over ride what the auto wanted and go into the gear i selected, so if i were doing 50 mph and was waiting for a gap to overtake as soon as the was a gap i could knock it down a gear and was gone! if i let the box do it i had a small wait, loads of revs and then it went.
From the lights you could stamp the pedal into the carpet and upto about 40 mph only the fastest road cars would keep up, no lag at all and i mean NO lag. This is from a gear box probably 20 years old now. The box in the nav reminds me of an auto Rover my mrs had (was it a rover metro? little two door thing like the mini metro) too long ago to remember, but it had a synquential auto box, my non mechanical explanation of it is that the plates would have to reach a spin point fast enough for the plate to engage the gear (this also feels a lot like the navara auto to me) its like they are using a similar setup. This could be a cost cutting exersise either in the box or on the extreme stress it can cause on the running gear.
I also had an Opel Manta 2.3 auto, again pulling away from the lights the back end would drop and it would launch away, as did my mates 2.3 V6 cortina :lol: These are all uato boxes from yesteryear, so today they should be lightning quick. I also remember reading a review on the trooper auto on how it seemed to remember and adjust to your driving style, drive economical and it changed at low revs, the nav has a mind of its own :shock:
Mine is a little bit unsure around town sometimes but tends to calm down after 10 miles or so. I'm not sure what the 'adaptive' thing is doing but I don't think it helps. Does anyone have any idea how this 7 speed is controlled, is the adaptive thing reset on every start-up or does it stay in some memory? Also on low throttle openings I'd love mine to change form 2 to 3rd at 1500rpm rather than 2000rpm, as it presently does, because with the torque available it just should!! And putting it in 'manual' doesn't help as you cannot force it to change up.
It isn't sluggish though, I've embarrassed a few boy racers, even one in a Civic when I had quarter of a ton of sand and some other junk in the back ! Sunderland boy racers beware.... :wink:
It isn't sluggish though, I've embarrassed a few boy racers, even one in a Civic when I had quarter of a ton of sand and some other junk in the back ! Sunderland boy racers beware.... :wink:
Joined
·
8,118 Posts
Do the Nav autos not have a tiptronic style setup and adjust gear changes to driving style??
Mines just inconsistent.
At low speed around town I've had revs and no power followed by 'normal' as though nothing has happened.
When cold it becomes indecisive, what gear I should be in?
Using the air-con makes it sluggish at low revs and ponderous accelerating.
Then we have long periods of 'normal'
In low box loads of torque, powers nicely distributed and does not crab to badly
Had an open motorway on Sunday evening and decided to open it up, put my foot down just over 100 it changed down and flew I chickened out around 125 but there appeared to be plenty more. Which begs the question have Nissan got these boxes set up right, is there a software issue, but who do you ask.
At low speed around town I've had revs and no power followed by 'normal' as though nothing has happened.
When cold it becomes indecisive, what gear I should be in?
Using the air-con makes it sluggish at low revs and ponderous accelerating.
Then we have long periods of 'normal'
In low box loads of torque, powers nicely distributed and does not crab to badly
Had an open motorway on Sunday evening and decided to open it up, put my foot down just over 100 it changed down and flew I chickened out around 125 but there appeared to be plenty more. Which begs the question have Nissan got these boxes set up right, is there a software issue, but who do you ask.
I agree it must be software controlled otherwise it just wouldn't change it's characteristics so much just because it's cold/warm or being driven hard etc..Overall I'm pretty happy with it but it does have so annoying characteristics. My mate bought a Golf R32 with a DSG and he's not 100% happy with the box in that either, same issues with it changing when you wouldn't expect etc..One thing I've noticed with mine (and it was the same on the test car) is that if you're doing about 70 on the motorway and knock it into 'manual' then it changes down a cog (7th into 6th I presume). The only reason I can think it has this characteristic is for rapid over taking, on A roads. My dad has just rang me after being in Evans Halshaw Sunderland to book mine in for an oil change (I'm old fashioned with regards to pieces of run-in steel murdering the turbo and cams). Anyway the salesman reckons there won't be many V6's coming this way for a while as the transmission is sourced in Japan, and they've just about stopped production. Good that it's made in Japan, probably built to last, unlike the clutches in early D40's.
Probably very good for residuals!!!!
Keep on trucking
Probably very good for residuals!!!!
Keep on trucking
Just found this:
http://wenku.baidu.com/view/11c9a77...XbQKJ510ErUV3RiNoCAAAA/HUPCA==&bcsi_scan_filename=11c9a7707fd5360cba1adb6c.html
Haven't posted before so I hope that link works
It's about the development of the Jatco JR711e which I'm pretty sure is what installed in the V6 Nav
It's all in there, shift maps, slippage contol the lot....
I'm struggling with it and I'm an engineer, but I can see why mine won't shift up until 30 and 38 mph now. I think that shift map would be fine for a petrol, but it could be refined for an engine with as much torque as the V9X. Going to haveto live with now I think. The control system for slippage also looks very involved....
http://wenku.baidu.com/view/11c9a77...XbQKJ510ErUV3RiNoCAAAA/HUPCA==&bcsi_scan_filename=11c9a7707fd5360cba1adb6c.html
Haven't posted before so I hope that link works
It's about the development of the Jatco JR711e which I'm pretty sure is what installed in the V6 Nav
It's all in there, shift maps, slippage contol the lot....
I'm struggling with it and I'm an engineer, but I can see why mine won't shift up until 30 and 38 mph now. I think that shift map would be fine for a petrol, but it could be refined for an engine with as much torque as the V9X. Going to haveto live with now I think. The control system for slippage also looks very involved....
Joined
·
5,536 Posts
As i said im sure this same gear box is in the new Nissan 370z sports car which is petrol.V6 soon! said:
Taken from Wikipedia about the 370z
Almost every piece and component of the 370Z has been redesigned from the previous model (350Z). It is powered by the VQ37VHR 3.7 L (230 cu in) DOHC V6 with Variable Valve and Lift Control and produces 332 bhp (248 kW; 337 PS). Power delivery to the rear wheels comes through a new 7-speed automatic transmission with paddle shifters or 6-speed manual transmission which features the world's first synchronized down shift rev-matching system, SynchroRev Match. The SynchroRev Match system is only available with the sports package. The differential offered with the Sport Package is indicated to be a viscous limited slip differential.
V6 soon, there is English and there is American and then there is Japanese American, anyone have an English translation for that paper. I've only read a few pages and they refer to trials on highways in the US but so far not to the engine it was matted with, any ideas? as that will have a dramatic influence on the 'complete package'
They go on to say that they relied on computer simulation rather than on road trials for development on the shift patterns. This brake bands and internal clutches are controlled electronically through solenoid valves, as with most modern AT's, so there's a 'solid state brain' in there some where. This is controlling shift based on various inputs from sensors so no doubt this can be tweaked. Judging by the feedback here, I don't think too much work went into tailoring the box to the application...I think it's just too jittery for a Navara
Put my foot down on the A19 the other night, charged past 110mph but stayed in top all the way, nothing funny from the gearbox. Lost my bottle at 115, don't really fancy a ban when I've just got my new motor.
Saw my old 55 reg D40 outlaw around town a few weeks ago, cleaner than when I had it! Had Iron man front shocks fitted to it, which were great, wonder if the new owner knows....
Saw my old 55 reg D40 outlaw around town a few weeks ago, cleaner than when I had it! Had Iron man front shocks fitted to it, which were great, wonder if the new owner knows....
1 - 20 of 35 Posts
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
