Issues & Defects from factory

GTRFAN · 12-07-2009, 09:48 PM

Quote:

Originally Posted by Majestik

I also read somewhere that it's incorrect on purpose so we have to service our cars sooner.
I dunno how that would work though...

It's because the car travels less distance and speed than indicated.

Am I the only geek who studied physics? I am bored at work, so here goes my explaination.

Imagine the entire road surface of the wheel as distance measurement of approximately 2m. (circumference)

The ECU is constantly counting how many times the wheel rotates and how many times per second this occurs via the ABS wheel sensors (or gearbox on some cars)

The ECU then multiplies the distance by the number of times and gets the total distance travelled. It can also calculate speed based on the number of rotations per second/minute/hour

Here's the problem....the ECU has a distance measurement for the wheels that it uses for all calculations. This figure is the innacurate part and is a bit longer than actual wheel circumference.

Majestik · 12-08-2009, 01:43 AM

Quote:

Originally Posted by GTRFAN

It's because the car travels less distance and speed than indicated.

Am I the only geek who studied physics? I am bored at work, so here goes my explaination.

Imagine the entire road surface of the wheel as distance measurement of approximately 2m. (circumference)

The ECU is constantly counting how many times the wheel rotates and how many times per second this occurs via the ABS wheel sensors (or gearbox on some cars)

The ECU then multiplies the distance by the number of times and gets the total distance travelled. It can also calculate speed based on the number of rotations per second/minute/hour

Here's the problem....the ECU has a distance measurement for the wheels that it uses for all calculations. This figure is the innacurate part and is a bit longer than actual wheel circumference.

Ahhh.. Now i feel stupid!

I thought it was magic!!

evse82 · 12-08-2009, 06:41 AM

It's ok Ronnie, he got his facts wrong:

Lets say for instance you are cruising at 100kph, if you, at any given time, lift up the storage compartments in the back (behind both driver and passenger seats) and unscrew the panel, you'll find what is causing the speedo to go out...... leprechauns.. two of them.. they actually sit in there and screw up the signals being sent to the ecu. I find the best solution is to leave cheese outside the car, when it's dark they'll jump out to feed, thats when you hit them with a shovel. Sell em on ebay for some quick cash, good for a sway bar.

MYZ34 · 12-08-2009, 06:43 AM

Gee · 12-08-2009, 07:15 AM

The outside circumference of the tyres will progressively reduce as you wear down the tread pattern.

Thus, the more you drive the slower you go, ergo , one day you'll be doing "60kmph" down the road and wondering why grandpa in his motorised wheelchair is racing you off at the lights and beating you! ;-)

G

Gee · 12-08-2009, 07:27 AM

Anyone know how the odometer works? Off the gearbox or ECU or? If it suffers from the same source of inaccuracies then I would really be cheesed off. The speedo is one thing, but if you are up to 10% out on the odometer I think that could be serious.

Imagine all those crimes where the cops calulate how far it was to get to the murder scene and back in time, the odometer could be kilometres out and so you get off scott free!

G

j.arnaldo · 12-08-2009, 01:19 PM

I remember when the '03 350Z came out, it had all kindsa bugs; then the '04 had fewer; then the '04.5, my year model--Touring Coupe--had most of 'em corrected (my beaZt's very reliable!). Then, in the '06 model, there was the oil-consumption issue, but the years following were great. Now comes the 370, starting the process all over! What's wrong with Nissan's engineers?! Nissan was classified as a "hit'n'miss" car manufacturer by CR. I think they really know what they're talking about!

theDreamer · 12-08-2009, 01:45 PM

Quote:

Originally Posted by j.arnaldo

I remember when the '03 350Z came out, it had all kindsa bugs; then the '04 had fewer; then the '04.5, my year model--Touring Coupe--had most of 'em corrected (my beaZt's very reliable!). Then, in the '06 model, there was the oil-consumption issue, but the years following were great. Now comes the 370, starting the process all over! What's wrong with Nissan's engineers?! Nissan was classified as a "hit'n'miss" car manufacturer by CR. I think they really know what they're talking about!

WTF?
Nissan engineers are fine, you cannot account for over 10k US sold vehicles plus however many more worldwide and expect a perfect vehicle. This is not a hand built car, even some of those have minor issues. Also, you are on a website dedicated to the car, with maybe 1% of owners here who even remote issues, there are bound to be problems with any car. I can bet you anything that your perfect model year 2004.5 350z has issues with some customers.

Get off your high horse and start thinking, this forum is for the 370z, not the 2004.5 350z is great without issues.

kdo2milger · 12-08-2009, 02:45 PM

Quote:

Originally Posted by j.arnaldo

I remember when the '03 350Z came out, it had all kindsa bugs; then the '04 had fewer; then the '04.5, my year model--Touring Coupe--had most of 'em corrected (my beaZt's very reliable!). Then, in the '06 model, there was the oil-consumption issue, but the years following were great. Now comes the 370, starting the process all over! What's wrong with Nissan's engineers?! Nissan was classified as a "hit'n'miss" car manufacturer by CR. I think they really know what they're talking about!

something about this post makes me want to shake babies!

vipor · 12-08-2009, 02:48 PM

Quote:

Originally Posted by kdo2milger

something about this post makes me want to shake babies!

if i [accidently] have one, you can shake it all you want

GTRFAN · 12-08-2009, 03:30 PM

Quote:

Originally Posted by evse82

unscrew the panel, you'll find what is causing the speedo to go out...... leprechauns.. two of them.. they actually sit in there and screw up the signals being sent to the ecu. I find the best solution is to leave cheese outside the car, when it's dark they'll jump out to feed, thats when you hit them with a shovel. Sell em on ebay for some quick cash, good for a sway bar.

Dammit. I knew I screwed up... I've been using carrots instead of cheese.

Quote:

Originally Posted by Gee

The outside circumference of the tyres will progressively reduce as you wear down the tread pattern.

Correct you are! Measurements are based on new tyres only, so this science can never be 100%.

Here's another question...Where does all the worn off rubber go as you never see piles of rubber dust on the side of the road? The wind? We breath it in? I dunno.

ChrisSlicks · 12-08-2009, 04:42 PM

Quote:

Originally Posted by GTRFAN

Here's another question...Where does all the worn off rubber go as you never see piles of rubber dust on the side of the road? The wind? We breath it in? I dunno.

You do see piles of it on the side of the race track. On the street the wear is so low that the deposits aren't typically measurable.

370Zsteve · 12-10-2009, 05:04 AM

Quote:

Originally Posted by GTRFAN

Here's another question...Where does all the worn off rubber go as you never see piles of rubber dust on the side of the road? The wind? We breath it in? I dunno.

Well a 5-lb chunk of it hit my motorcycle helmet once while I was traveling down I-95. Always wear a helmet.

vipor · 12-08-2009, 01:52 PM

2004.5 > all? i'm lost

2theextreme · 12-08-2009, 02:05 PM

Quote:

Originally Posted by vipor

2004.5 > all? i'm lost

12-08-2009, 07:15 AM	#5 (permalink)
Gee Base Member Join Date: Nov 2009 Location: Central Coast NSW Aust. Posts: 71 Drives: 09 370Z MB M6 Rep Power: 16	The outside circumference of the tyres will progressively reduce as you wear down the tread pattern. Thus, the more you drive the slower you go, ergo , one day you'll be doing "60kmph" down the road and wondering why grandpa in his motorised wheelchair is racing you off at the lights and beating you! ;-) G __________________ "...'cause the only decent things that come in 2 litres are milk & orange juice"

12-08-2009, 07:27 AM	#6 (permalink)
Gee Base Member Join Date: Nov 2009 Location: Central Coast NSW Aust. Posts: 71 Drives: 09 370Z MB M6 Rep Power: 16	Anyone know how the odometer works? Off the gearbox or ECU or? If it suffers from the same source of inaccuracies then I would really be cheesed off. The speedo is one thing, but if you are up to 10% out on the odometer I think that could be serious. Imagine all those crimes where the cops calulate how far it was to get to the murder scene and back in time, the odometer could be kilometres out and so you get off scott free! G __________________ "...'cause the only decent things that come in 2 litres are milk & orange juice"

12-08-2009, 01:19 PM	#7 (permalink)
j.arnaldo Banned Join Date: Oct 2009 Location: Puerto Rico Posts: 937 Drives: Nissan 350Z, 2004 Rep Power: 0	I remember when the '03 350Z came out, it had all kindsa bugs; then the '04 had fewer; then the '04.5, my year model--Touring Coupe--had most of 'em corrected (my beaZt's very reliable!). Then, in the '06 model, there was the oil-consumption issue, but the years following were great. Now comes the 370, starting the process all over! What's wrong with Nissan's engineers?! Nissan was classified as a "hit'n'miss" car manufacturer by CR. I think they really know what they're talking about! Last edited by j.arnaldo; 12-08-2009 at 01:22 PM.

12-08-2009, 01:52 PM	#14 (permalink)
vipor A True Z Fanatic Join Date: Aug 2009 Location: Euless, TX [ DFW ] Age: 42 Posts: 13,531 Drives: Nismo 09-0183 QAB Rep Power: 49	2004.5 > all? i'm lost __________________ 2009 NISMO # 0193 \| QAB \| Albums! \| 05.04.10 (Dynojet) 291.94hp/248.28tq Oil Cooler (DIY) \| Custom Headlights \| GTSPEC Braces \| F.I. Long Tube Headers

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12-08-2009, 06:41 AM	#3 (permalink)
evse82 Track Member Join Date: Nov 2008 Location: Melbourne, AUS Posts: 609 Drives: Black 370z MT Rep Power: 18	It's ok Ronnie, he got his facts wrong: Lets say for instance you are cruising at 100kph, if you, at any given time, lift up the storage compartments in the back (behind both driver and passenger seats) and unscrew the panel, you'll find what is causing the speedo to go out...... leprechauns.. two of them.. they actually sit in there and screw up the signals being sent to the ecu. I find the best solution is to leave cheese outside the car, when it's dark they'll jump out to feed, thats when you hit them with a shovel. Sell em on ebay for some quick cash, good for a sway bar.

12-08-2009, 06:43 AM	#4 (permalink)
MYZ34 Base Member Join Date: Sep 2009 Location: brisbane AUS Posts: 111 Drives: 2009 370z 6spd Rep Power: 16