Yes, the 03 MT will put out more peak HP and than the 03 AT at the higher RPMS. But, the majority of that is not due to the transmission. It was the difference in the FD gear that caused it. Also, most people forget to look at the whole dyno graph. The AT had better torque management in the low to mid RPMS. This is the area that most driving is done. I don't recall the difference being that great when testing a MT Z and an AT Z that were the same. Which model Z's are you comparing? 10-15 Peak HP difference sounds more realistic. There possible could be that much difference between the various models.

You got to have all these the same or there is too much difference.
1. The same engine
2. Same gear ratio
3. Same final drive ratio
4. Same wheel size.

Back when the 03-04 Enthusiast Z had the same configuration in MT and AT the only difference between the AT and MT was, of course, the tranny and the FD. These were the two closest matched MTs & ATs made so they are pretty representative of the difference. Of course you are going to have some factory freaks and dogs in that sample but barring those extremes they should be pretty well matched.

They both have the same engine.
The MT in 5th gear and the AT in 4th gear had the same 1:1 gear ratio
They both have the same 17" wheels as stock
The MT had a 3.5 FD vs the 3.3 FD on the AT

The average result in the high RPM range was that the MT has ~3% higher peak horsepower than the AT. After you factor in the difference in the FD the MT advantage was less than 1% over the AT. The majority of the difference was in the FD and not the main gearbox.

 

FD's will make no difference in whp

Stop wasting your time typing out a bunch of useless info that has no bearing on the FACT that the AT5 HAS more drivetrain loss than the MT6

 

Nissan's 6MT 350Zs waste less hp than their 5AT 350Zs.

Nissan's 6MT 350Zs have more problems and are in the shop more than their 5AT 350Zs.

Some people prefer to keep their right hand and left foot busy when they drive and some people prefer not to.

MT vs AT threads =

 

Didn't mean to work everyone up :O Was just wondering because the only z around here (in daytona blue the color I want) is an AT

 

I was just curious, sorry to get everyone worked up

 

Daytona Blue & 5AT FTW!

Is it a Touring or an Enthusiast model?

 

touring

 

http://cars.com/go/search/detail.jsp...eadExists=true

dunno if Im feeling that leather, its not bad tho.

 

How am I wrong??

Generally, the lower the transmission gear or final drive ratio, the greater the engine loading and higher the power reading will be. Since the lower gear ratio slows the engine’s acceleration rate, less power is required to accelerate the rotating and reciprocating parts.

Ask any shop that has a dyno or do a Google search and you will see that the FD does make a difference.

I said that you were correct that the 5AT has lower peak HP than the 6MT. But, it's not because of the tranny but the FD. You said that most of the loss was because of the transmission when in fact that it's not. When the TC is locked, there is no longer any hydraulic loss because the tranny uses a mechanical clutch.

 

 

http://cars.com/go/search/detail.jsp;?tracktype=usedcc&searchType=21&pageNumber=0&numR esultsPerPage=50&largeNumResultsPerPage=0&sortorder=descendi ng&sortfield=PRICE+descending&certifiedOnly=false&criteria= K-%7CE-%7CM-_36_%7CB-25000%7CD-_6068_%7CN-N%7CR-75%7CI-1%7CP-PRICE+descending%7CQ-descending%7CZ-01832&aff=national&paId=211401384&recnum=7&leadExists=true[/url]

dunno if Im feeling that leather, its not bad tho.

 

Isn't Tiptronic exclusive to Porsches?

 

No.

 

found another daytona blue 2003 z but its also AT

 

If you are going for an 03-04, then I would suggest an AT 350Z. Far less transmission problems.

 

Shankie what is your budget, what transmission do you want, what do you want roof style coupe/vert, and what are your two favorite colors? Also what zipcode are you at? I will do a search for you with my methods and PM you a few nice cars tonight.

 

I didn't call it an automatic. BMW called it an automatic transmission. When they call it manual I will call it a manual, also.

This was taken direct from BMW. (See link below) They give a little bit of history of the SMG and talk about all it's automatic functions.

http://www.bmwclub.org.hk/smg2.htm

I'm not doubting that you are able to drive a circuit faster in your MT than in an AT. But, lap times in the Z whether they are AT or MT is more a matter of driver skill.

Again, all multi-gear transmissions have at least one clutch. It doesn't matter if the car is an AT or MT. There's is no ifs, ands or buts on this. They all do the same functions. The only difference is how they are controlled. A manual transmission car has a mechanical, manually operated clutch to engage and disengage the gears. An automatic transmission car has a hydraulic, electronically controlled clutch or clutches to engage and disengage the gears.

The most obvious test to see if a car is a MT or AT is to see what controls the clutch and shifting. If the driver has full control of both, then it's a manual transmission. If a computer controls the clutch and or shift process it's an automatic transmission. It doesn't matter if it uses a torque converter or friction plates. Those only provide the method of power transfer from the engine to the driveshaft. The TC or the friction plates do not control the actual gear changes.

The advantages/disadvantages of using friction plates or a torque converter to transfer power should be a different discussion.

 

NM the name Tiptronic is, the actual tranny is used in many cars, just called different things.

 

Shanki,

In my honest opinion, you shouldn't let any of us tell you which transmission to get. Just go out and drive both and see which one you like better. You'll be much happier.

 

Do the AT transmissions grind at all?