130mphs

[Protege01MP3]

gotta remember the size of 5th gear is bigger... say (and this isn't correct, but its just an example) say in 2nd gear every increase of 1,000 rpm equaled an increase of 5mph... well in third gear 1,000 rpm increase could equal a 7mph increase... and all the way up into 5th gear a 1,000 rpm increase could equal like 15mph increase... or somethin like that... did that make sense??

so if you were at 32mph in 2nd and were at say... 3,000 rpm and to get up to 41mph you would probably be at 4,000 - 4,500 maybe more... but in 5th gear at 132mph your at about 5,700 rpm in order to go up to 141mph you would only have to increase by a couple hundred rpm for that extra 9mph

 

[tritonheat1]

gotta remember the size of 5th gear is bigger... say (and this isn't correct, but its just an example) say in 2nd gear every increase of 1,000 rpm equaled an increase of 5mph... well in third gear 1,000 rpm increase could equal a 7mph increase... and all the way up into 5th gear a 1,000 rpm increase could equal like 15mph increase... or somethin like that... did that make sense??

so if you were at 32mph in 2nd and were at say... 3,000 rpm and to get up to 41mph you would probably be at 4,000 - 4,500 maybe more... but in 5th gear at 132mph your at about 5,700 rpm in order to go up to 141mph you would only have to increase by a couple hundred rpm for that extra 9mph

My redlines (MPH):

1st gear: 33mph
2ndgear: 58mph
3rd gear: 81mph
4th gear: 114mph
5th gear: don't know.

does that sound about right???? BTW does the Turbo change the idleling when at top end power.

 

[Protege01MP3]

yah that sounds about right.... but thats not really what my point was... my point was that 5th gear is waaayyy bigger than... say.. umm... 2nd gear... so therefore it doesnt take as much of an rpm increase to produce the same mph increase


in 2nd gear to gain 10mph you have to rev up approx 1,000 rpm.. just a little less i suppose.. like about 800 maybe... and to gain 10mph in 5th gear you only have to increase rpm by like 400 maybe 500... so thats why 141 is only like 300-400 rpm higher than 132

BTW does the Turbo change the idleling when at top end power.

not sure i understand that one... what r u asking??

 

[tritonheat1]

not sure i understand that one... what r u asking?? [/B]

I mean when you add a turbo to the car does the idle change. Say like stock at 3000rpms in 5th gear is at 65mph, but when u add the turbo does it still idle at 3000rpms at 65mph, or does it stay the same. That's what i meant towards the Q? i asked towards smp3000.

 

[smp3000]

idle at 65 mph? The car only idle's when it is on and either not in gear or with clutch in and no gas given.

If I did either of the above at 65 mph the speed would drop and the rpm's would drop to zero.

I also am not sure what you are asking.

 

[Boxer6]

I think he meant when "he" does 3000RPM in 5th gear, he is doing 65MPH. So when protege with a turbo does 3000RPm in 5th gear... what speed will it be...

idle at 65 mph? The car only idle's when it is on and either not in gear or with clutch in and no gas given.

If I did either of the above at 65 mph the speed would drop and the rpm's would drop to zero.

I also am not sure what you are asking.

 

[Protege01MP3]

ok.. first...

Say like stock at 3000rpms in 5th gear is at 65mph, but when u add the turbo does it still idle at 3000rpms at 65mph, or does it stay the same

ok... now.... uummmm... what????

second.. yah.. i was gonna say that smp.. the car is only at idle when it is.. well... at idle...

Quote from dictionary.com
idle
adj.idler, idlest

a. Not employed or busy: idle carpenters. See Synonyms at inactive.
b. Avoiding work or employment; lazy: shiftless, idle youth. See Synonyms at lazy.
c. Not in use or operation: idle hands.

now.. if this is the question "does adding a turbo change the rpm:mph ratio" or in other words "say the car revs up to 3000 in 5th gear and runs at 65mph, does adding a turbo stay the same or will it make the car running at 3000 rpm run at... say... 70mph" then the answer is no it will not change it... like i mentioned before, the gear ratio determines how fast you go at what rpm.. not how much power... more power will just cause you to get to that speed quicker.. all the gears still rev upto 7,000 and all the speeds at the top of the gears (actually.. all the way through the gears) will stay the same... the bigger the gear the faster you can go (provided you have enough power to get upto that speed)

this is also why you cant take off from 5th gear... its a bigger gear, and therefore can give you higher speeds, but there isnt enough (hmmmm.. whats the word) torque, or tension, or power to get the gear spinning from the start... you need a smaller gear, like first or second... those two are tiny enough to where it takes WAY less power to get them spinning... then once you have the car moving, you can switch to the next biggest gear, which will get you up to a higher speed because, well, its bigger, and you already had the forward motion, so the gear is already spinning, and doesn't need the energy to "start" the gear... then once you get that one spinning high enough you can jump to the next biggest... its really hard to explain without actually talking to someone in person... trying to type out everything floating in my head is difficult

 

[LinuxRacr]

In short, yes the car still has the same RPM at given speed, even with a turbo. In order to change you speed at a given RPM in a given gear, you have to change the gears for a different gear ratio.

 

[Protege01MP3]

see... how come some people can take a whole book and put it into two sentences... and i cant explain it to save my life...

thx linux

 

[NOXIDE DESIGNS]

PRO

I HIT 135 AND IT FELT LIKE THE WHEELS WHERE GOING TO FALL OFF.... IT TOOK A WHILE BUT I GOT THERE....

 

[Rogue]

Ok everyone...I've been trying to figure this out for a while...some people were talking about the TOP speed for the MP5. Some were asking if a turbo will increase TOP speed. Those who said yes...well, are wrong. Your TOP speed is determined by your transmission and your final gear ratios. I took the time to dig up some old math computations to figure out the actual top speed of the MP5. This is taking into assumption you're running the stock 195/50/16 tires and the stock GM15-R tranny. Now try to keep up:

Top speed = R / T * C
R = RPM
T = Tranny ratio
C = Circumference of your tire

R = 7200 rpm (rotation per minute)
T = .755 (5th gear) * 4.105 (final gear) = 3.099
C = (((195mm * .50) / 10 / 2.54) + 16in) * pi = 62.293 in = 5.191 ft

You may wonder where these numbers are coming from
195mm is the width of the tire
.50 is the aspect ratio, which is the relationship between the tire's height and it's width
/ 10 is to convert from mm to cm
/ 2.54 is to convert from cm to in
16 is the size of the rim
the total Diameter of the tire is 19.838 in
using the formula C = D pi

R / T = 2330.097 RPM (at the wheels) * 60 min = 139,805 RPH (at the wheels)

Top speed = 139,805 RPH * 5.191 ft = 725,727.755 ft/hr = 137.4 mph

"But there's the picture of the guy going 140 mph. What about that?!"

Here's your answer. THEY CAN BE INNACURATE.

I'm sorry to say that he probably wasn't doing 140 mph.
I hope this clarifies some misconceptions about top speed.

Feel free to question, double check, etc.

 

[1sty]

Nice work!

However I notice that formula does not account for wind resistance or altitude, won't these things make a large difference and is this formula based on a sea level and no wind resistance?

Not busting balls here just trying to determin if there is more to this or if the formula means no matter the conditions the car is capable of this speed eventualy and everythig else will just slow down how fast the car gets to the 137 mph?

 

[Rogue]

Nice work!

However I notice that formula does not account for wind resistance or altitude, won't these things make a large difference and is this formula based on a sea level and no wind resistance?

Not busting balls here just trying to determin if there is more to this or if the formula means no matter the conditions the car is capable of this speed eventualy and everythig else will just slow down how fast the car gets to the 137 mph?

Thank you!

But you're right. I'm assuming 0 air resistance. The speed I'm showing if the physical limit of the gearing in a stock tranny/tire. Any outside variable would only slow down acceleration, not decrease top speed.

 

[Adam3482P]

jeez I think people are defintaly confusing Drag limited top speed for redline limited top speed. If a car stops gaining speed because the engine cannot pull against the force of the wind it is drag limited. If a car stops gaining speed because the gears will not go any further (rev limiter) then it is redline limited. turbo or not the top speed is the same It just depends on if you have enough horsepower to fight the wind and reach it.

And dont flame me for trying to say it simple instead of using long scientific words.

 

[Adam3482P]

Oh and the fastest I have been in my mp3 is 120 could have been faster just to scared to do it. And It will go to almost 120 in 4 gear if i really wind it out.

And someone said about the fastest they have been. I would have to say in a Porsche Boxter...150 MPH. I know not the fastest or best car but i'm a young poor kid from North Carolina. OH yes it was stolen, Yes i was driving, and no I didnt go to jail!!!

 

[70]

And someone said about the fastest they have been. I would have to say in a Porsche Boxter...150 MPH. I know not the fastest or best car but i'm a young poor kid from North Carolina. OH yes it was stolen, Yes i was driving, and no I didnt go to jail!!!

[sarcasm]Wow, that's great...[/sarcasm]

 

[dolphin]

Here is a small table I put together for the MP3. Remember that this represents only the machanical limitations from the drive train and have nothing to do with the power applied.

The Transmission and final drive ratios came from the original Mazda USA web page on the MP3. The MPH were calculated based on the stock 205/45-17 tire whose calculated diameter is 24.26 inches.

MP3 gears
transmisson gear; ratio; overall ratio; MPH at 6500 RPM
1 3.307 4.105 34.58
2 1.842 8.210 62.08
3 1.310 12.315 87.29
4 0.970 16.420 117.88
5 0.755 20.525 151.45

Final drive 4.105
Tiresize 205/45-17

 

[Adam3482P]

[sarcasm]Wow, that's great...[/sarcasm]

Hey at least i wasn't the one that stole it you didnt ask that
And no thats not my normal behavior

 

[Rogue]

**RE-POST** with corrections

Ok everyone...I've been trying to figure this out for a while...some people were talking about the TOP speed for the MP5. Some were asking if a turbo will increase TOP speed. Those who said yes...well, are wrong. Your TOP speed is determined by your transmission and your final gear ratios. I took the time to dig up some old math computations to figure out the actual top speed of the MP5. This is taking into assumption you're running the stock 195/50/16 tires and the stock GM15-R tranny. Now try to keep up:

Top speed = R / T * C
R = RPM
T = Tranny ratio
C = Circumference of your tire

R = 7200 rpm (rotation per minute)
T = .755 (5th gear) * 4.105 (final gear) = 3.099
C = ((((195mm * .50) / 10 / 2.54) * 2) + 16in) * pi = 74.346 in = 6.195 ft

You may wonder where these numbers are coming from
195mm is the width of the tire
.50 is the aspect ratio, which is the relationship between the tire's height and it's width
/ 10 is to convert from mm to cm
/ 2.54 is to convert from cm to in
16 is the size of the rim
the total Diameter of the tire is 19.838 in
using the formula C = D pi

R / T = 2330.097 RPM (at the wheels) * 60 min = 139,805 RPH (at the wheels)

Top speed = 139,805 RPH * 6.195 = 866091.975 ft/hr = 164.03 mph

"But there's the picture of the guy going 140 mph. What about that?!"

Here's your answer. THEY CAN BE INNACURATE.

I'm sorry to say that he probably wasn't doing 140 mph.
I hope this clarifies some misconceptions about top speed.

Feel free to question, double check, etc.


The reason I'm reposting this is because I found an error in my calculation. I only took in the thickness of the tire on one side of the rim, not both. The corrections are in bold. It also means that he was probably actually going 140. Sorry about misleading you.(hand)

 

[Mazdaspeedgirl]

All: I sincerely doubt any protege with stock gear ratios will break 145.

Right. Boost just makes you get thru the gears faster.