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auto/manual

15 posts in this topic

Posted · Report post

i know this has been asked before.Im looking at buying 370 roadster but wife wants me to by auto so she can drive it.Ive never had a sports car auto(or one that she can drive).Will i regrete it?For those who have had an auto for a while are you regreting not getting a manual

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Posted · Report post

Hey Elvis, I (we) got an auto for the same reason. So wifey could drive it. Two years down the track ... She still hasn't driven it. But, I'm loving the auto. Great fun when you slap it in manual mode and rev it out and shift with the paddles. And for days when I wanna chill I just leave it drive and cruise away..  Best of both worlds IMO.

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Posted · Report post

that would piss me off  if she doesnt drive it.I like driving manuals.what are the gear changers like(delay)?

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Posted · Report post

Not too bad, slight lag ,but generally pretty good. Go to a dealer and take one for test drive.. See what ya think. 

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Posted · Report post

Hey elvis, how did you go, get the roadster? 

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Posted · Report post

I'm almost there,I've driven a few auto/man and I am taking my time.I have decided on 2011/12 Gray.This will be a weekend car only so mine not in a hurry,just waiting for the right car.

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Posted · Report post

I recently got a 2013 roadster auto.  Great car and very happy with both the auto and manual feel. Coming out of a manual wrx the auto wins hands down. 

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Posted · Report post

I bought an auto for similar reasons, we (the wife & I) regularly do a 6 hour each way drive to central west NSW to check on her ageing parents.

Really handy to have another driver to do the stints where the cops are usually hiding lol.

She cant drive a manual & its the only time she drives the car, but still worth it imo.

I'm in my 50's & its the first auto i've ever owned, i've owned & built some fairly high performance manual vehicles over the years so this was quite a step.

Overall i'm pretty happy with it, I do however only drive with the paddles in manual mode.

So I haven't fully let go yet.

After 2 years of practice with the paddles I feel i know the trans pretty well, mind you my 370gt has the 5at not the 7 in the Z, that said, they feel much the same to drive.

It is a little laggy in some circumstances, generally down shifting in the lower rev range.

I find the harder I push it, the more positive & faster the changes are, especially on the down shifts.

Once you get to know the trans you can work around its weaker shifting areas to improve the experience.

Being a Modder I am about to fit a Shift kit & a remote cooler I bought a while back, which i'm hoping will tidy up a couple of those weaker shift points & generally improve the feel.

So yeah, I'm pretty happy with it.

Cheers.

 

 

 

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Posted · Report post

Thanks for the reply,tell me what you mean with the shift kit(I assume they already have a manualize kit in it)

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Posted · Report post

Ok, first let me just say I'm definitely no expert on Automatic Transmissions, as I stated earlier, this is my first Auto equipt personal car.

I have however been around Auto's quite a bit & built cars for friends/customers previously fitted with Auto's, so i think I have a fairly decent understanding.

Firstly I'm not aware of an off the shelf kit available for the 7at, any decent transmission specialist should be able to make one up though. Fortunately they are available for the 5at which is what I have.

So what does it do? Well its really just a way to modify the behaviour of your trans.

You firstly need to understand that the Auto box, like a lot of components on the Z are set up from the factory with a compromise between performance & comfort to cater for the big variety of owners.

There are also other things built into the equation such as drive line preservation etc,etc.

The trans is designed to shift smoothly, reliably & predictably to suit most Z buyers & not put to much strain on the tailshaft uni's, differential & axles & not kick out to much under full throttle changes in the wet etc.

What a shift kit does, is it pushes the line across to the sporty side at the sacrifice of the comfort side.

Shifts under heavy throttle applications become much faster & firmer, but they should not become harsher.

In other words they should not overly Jar the driveline.

One of the biggest noticeable areas of change is in the lower gears.

First to second & second to third will be noticeably faster as they are the softest changes on a stock box, done by the factory that way for the reasons outlined above.

After shift kitting (depending on your tyres) you should be able to get a good chirp from full throttle changes in this area, which is just highlighting the more positive engagement of the gears.

In very basic terms, when an auto changes gears, for example changing up from second to third, when the shift happens, third is engaged before second is released, when second is released that is the moment when the change happens. The friction plates in the trans control this & just like in a manual trans, the application of the clutches determines how the shift feels.

The length of time for this operation to happen determines the speed of the shift & the amount of heat generated by the friction plates.

This is a must under high horsepower applications as well as other modifications, such as more aggressive friction material on the plates, more plates where they can be fitted, & machining out the friction drums to accommodate extra plates.

All of this stuff is on the mechanical side of the trans, but there is also tweaks that can be applied the electronic control too.

Back to just a shift kit though, some people such as myself love them & others not so much.

It really all depends on what exactly the individual wants from their car.

I hope that was some help to you & apologies for rambling on a bit.

Cheers, Trevor.

 

 

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Posted (edited) · Report post

Others have done it - see 2012 post below

I would be concerned about the load on the bands and durability

As a motor sport oriented guy I really hate conventional auto's with torque converters (with 1 exception, the ZF transmission) - for a sports car like the Z I would always go for the manual.

My daily drive is a VAG with the DSG auto - dual clutch - absolutely love it - no torque converter, dual clutches (real clutches), lightening fast changes, but also seamlessly smooth and non eventful during the daily grind.

Dual clutchs seem to be a Euro thing, the Japanese have not embraced dual clutches at all, instead they prefer CVT (continually variable), but every CVT owner I've spoken to says they won't buy one again.

 

 

Edited by MartinZ

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Posted · Report post

Well explained,I love rambling

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Posted · Report post

I would be concerned about the load on the bands and durability

Nothing to be concerned about, at stock, or mildly upgraded power levels, the shift kit will actually make life easier for the transmission.

A more positive engagement will reduce the heat generated & dumped into the oil.

Wack on a decent cooler & you should get plenty of fast laps without overheating it.

Increasing the power put through it without further modifications will however reduce its lifespan.

Just like with a manual transmission, is you feed more power into it you will quickly find the weakest link, usually the clutch

In an NA application imo its all positive, the extra force is transferred further down the driveline, you may see slightly earlier wear on the drive shaft & axle uni's/cv's, well worth the trade off imo.

Big power increases from forced induction is where the Auto is gonna cost you some coin, where as the manual trans seems to be good to go, other than the previously mentioned mandatory clutch upgrade.

Cheers Guys,

Trevor.

 

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Posted · Report post

after looking for over a year finally found the right car,the wife is extremely happy it's an auto.look forward to catching up and talking about type of mods 

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Posted · Report post

I absolutely love this car,just done over a thousand km on the great alpine rd this weekend.The power is pretty good ,actually surprised me.When is the next catchup.

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