Possible to see visual evidence of car breaking in? - Ford Mustang Forum
 
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post #1 of 11 (permalink) Old 10-04-2010 Thread Starter
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Possible to see visual evidence of car breaking in?

Everyone will probably think I'm nuts after reading this but I can't fight off the curiousity enough not to ask. So here it is, I'm 99.9% sure that the RPM to MPH relationship has changed in my car since I've had it/been driving it.

Day I picked it up (w/ 3 miles on it): 60 mph in 6th gear = 2,000 rpms

Yesterday (w/ 350 miles on it): 60 mph in 6th gear = 1,800 rpms

*it has been a gradual change, not 2000 then 1800 overnight or anything like that

So like I asked in the title of the thread, is it possible that this is evidence of the car breaking in or am I just nuts? My off-the-wall/not backed by anything concrete theory is that the rings are seating and the engine is becoming more effcient so it no longer needs 2,000 rpms to achieve 60 mph in 6th gear, it only needs 1,800 rpms to do it now. But like I said, this theory isn't backed by anything but my uneducated-in-engine-dynamics brain, so it could be 100% wrong, haha.

What does everyone think, good guess or just nuts?


Jason

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post #2 of 11 (permalink) Old 10-04-2010
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I have no idea lol but I'd assume that an RPM is an RPM, like there no such thing as a more efficient pound.

Have you changed your seating? The lines are so close you could be looking at the gauge at a slightly different angle causing you to see a different marking because of your vantage point.

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post #3 of 11 (permalink) Old 10-04-2010
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Quote:
Originally Posted by 02_GT_5spd View Post
Everyone will probably think I'm nuts after reading this but I can't fight off the curiousity enough not to ask. So here it is, I'm 99.9% sure that the RPM to MPH relationship has changed in my car since I've had it/been driving it.

Day I picked it up (w/ 3 miles on it): 60 mph in 6th gear = 2,000 rpms

Yesterday (w/ 350 miles on it): 60 mph in 6th gear = 1,800 rpms

*it has been a gradual change, not 2000 then 1800 overnight or anything like that

So like I asked in the title of the thread, is it possible that this is evidence of the car breaking in or am I just nuts? My off-the-wall/not backed by anything concrete theory is that the rings are seating and the engine is becoming more effcient so it no longer needs 2,000 rpms to achieve 60 mph in 6th gear, it only needs 1,800 rpms to do it now. But like I said, this theory isn't backed by anything but my uneducated-in-engine-dynamics brain, so it could be 100% wrong, haha.

What does everyone think, good guess or just nuts?
Not possible. The RPM Vs speed in gear is a fixed Mechanical relationship. It won't change unless your clutch or tires are slipping. The resolution of the Tach is not good enough to determine this. Plug in a scangauge or something that measures precise Speed and RPM's digitally and you'll see it remains the same regardless

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post #4 of 11 (permalink) Old 10-04-2010
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Quote:
Originally Posted by Modshack View Post
Not possible. The RPM Vs speed in gear is a fixed Mechanical relationship. It won't change unless your clutch or tires are slipping. The resolution of the Tach is not good enough to determine this. Plug in a scangauge or something that measures precise Speed and RPM's digitally and you'll see it remains the same regardless
x1000

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post #5 of 11 (permalink) Old 10-04-2010
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x1000
well holy shyt, look who it is! two of my old compatriots from the370z

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post #6 of 11 (permalink) Old 10-04-2010 Thread Starter
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Quote:
Originally Posted by xxsjxx1 View Post
I have no idea lol but I'd assume that an RPM is an RPM, like there no such thing as a more efficient pound.

Have you changed your seating? The lines are so close you could be looking at the gauge at a slightly different angle causing you to see a different marking because of your vantage point.
I moved the seat back a little as I got used to the clutch but I think that would have created the illusion of higher rpm's rather than lower rpm's, who knows, I probably just read the tach wrong the first day I had it due to the sheer excitment and enjoyment, haha.

Quote:
Originally Posted by Modshack View Post
Not possible. The RPM Vs speed in gear is a fixed Mechanical relationship. It won't change unless your clutch or tires are slipping. The resolution of the Tach is not good enough to determine this. Plug in a scangauge or something that measures precise Speed and RPM's digitally and you'll see it remains the same regardless
Fair enough, I know the tires and clutch aren't slipping (which I think would cause an increase in rpm's anyways) so I must have just read the tach wrong initially.

Thanks for the quick (and gently put for such an off-the-wall idea) input guys .

Jason

'14 F150 4x4 SuperCrew 302

SOLD
'11 GT MT w/ 3.73s and some bolt-ons
550 RWHP / 490 RWTQ
11.94 @ 123, 1.84 60 ft.
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post #7 of 11 (permalink) Old 10-04-2010
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Originally Posted by ASchmidt6 View Post
well holy shyt, look who it is! two of my old compatriots from the370z
omg hai 2 u

- Steve

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post #8 of 11 (permalink) Old 10-04-2010
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Stop feeding your tires, I think they're growing.
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post #9 of 11 (permalink) Old 10-04-2010
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yeah i think it may just be you going a little nuts ever since the day i got mine, 6th gear at 60, even around 65 was around 1800 rpm

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Originally Posted by zachmerrill504 View Post
yeah i think it may just be you going a little nuts ever since the day i got mine, 6th gear at 60, even around 65 was around 1800 rpm
This car is flipping amazing. I can do 75mph with 2200 rpm! Unreal!
I love my car. I've had some sweet rides in the past: BMW's, Audi's, corvettes. But nothing compares to the feeling I get when I drive my Mustang!

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Check yee self into the nearest loony bin ASAP...:kooky:

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