[coste1l]

Errrr NO I don't mean 4th gear, otherwise I would have said 4th gear! I've been driving long enough to know the difference, believe it or not.

Sounds like something's wrong with your motor to me.

Steve

ive attached something pottsy did a while ago showing the optimum changes for a remapped civic which led me to ask the question so if youre car is doing 85 in 3rd i suspect your speedo has gone wrong mate i wish it was possible believe me i do

 

[welly]

ive attached something pottsy did a while ago showing the optimum changes for a remapped civic which led me to ask the question so if youre car is doing 85 in 3rd i suspect your speedo has gone wrong mate i wish it was possible believe me i do

Those figures are for optimum gear changes rather than maximum speed in each gear. What they are showing is that for the fastest acceleration it is better to change up when either max power or max torque or both have been utilised. A re-map will have no bearing at all over the top speed in any gear but will massively effect the time taken to get up to those speeds.

I think I remember being able too reach about 90 mph in third in my 2.2 but not totally sure, I am sure that the Mazda 3 2.2 deisel would hit over 80 in third.

 

[coste1l]

if you look at the rpm for the gear change you will see that there isnt much left to go but from the same thread the standard 2.2 at just before the limiter in 3rd now unless you change the box how can you go any faster in the same gear??

 

[welly]

By taking the revs from the 1st gear change point (not the rev limiter) of 4670 and and multiplying by the mph per revolution in 3rd gear gives you 81 mph. Not sure at what revs the limiter cuts in at so can't give you the exact figure.

 

[welly]

Just found this http://www.civinfo.com/forum/engines-and-transmission/12759-rev-limiter.html thread that suggests the rev limiter does not come in till over 5000 RPM. At 5000 RPM with the gearing off the info you have attached would equate to 87 MPH in 3rd gear, and if, as one person on the thread suggests that the limiter is actually set at 5500 RPM that would equate to over 90 MPH in 3rd gear.

 

[coste1l]

gentlemen i humbly apologise my car will achieve 85mph in 3rd gear and may have actually gone further but mechanical sympathy prevented it. It certainly isnt the best way to drive it to achieve maximum acceleration but it is possible. im now going to bake a custard pie for my face...........

 

[Relic]

Independent Gear ratios
1st 3.933
2nd 2.037
3rd 1.314
4th 0.975
5th 0.777
6th 0.653
Final drive 3.285

Combines Gear ratios
1st 3.933 * 3.285 = 12.919905
2nd 2.037 * 3.285 = 6.691545
3rd 1.314 * 3.285 = 4.31649
4th 0.975 * 3.285 = 3.202875
5th 0.777 * 3.285 = 2.552445
6th 0.653 * 3.285 = 2.145105

Wheel circumeference = ((225 * 0.45 * 2) + (17 * 25.4)) * pi() = 1992.712mm

Speed per 1000rpm per gear.
1000000 mm/km
1.609 km /mile
60 min/hr
1st 1992.712 * (1000 * 60) / 1000000 / 1.609 / 12.919905 = 5.751 MPH / 1000 RPM
2nd 1992.712 * (1000 * 60) / 1000000 / 1.609 / 6.691545 = 11.105 MPH / 1000 RPM
3rd 1992.712 * (1000 * 60) / 1000000 / 1.609 / 4.31649 = 17.215 MPH / 1000 RPM
4th 1992.712 * (1000 * 60) / 1000000 / 1.609 / 3.202875 = 23.201 MPH / 1000 RPM
5th 1992.712 * (1000 * 60) / 1000000 / 1.609 / 2.552445 = 29.113 MPH / 1000 RPM
6th 1992.712 * (1000 * 60) / 1000000 / 1.609 / 2.145105 = 34.641 MPH / 1000 RPM

 

[Chip]

gentlemen i humbly apologise my car will achieve 85mph in 3rd gear and may have actually gone further but mechanical sympathy prevented it. It certainly isnt the best way to drive it to achieve maximum acceleration but it is possible. im now going to bake a custard pie for my face...........

Humble pie tastes better! Did you go to Germany this morning to find out?

 

[coste1l]

errrrr yes of course

 

[Chip]

Independent Gear ratios
1st 3.933
2nd 2.037
3rd 1.314
4th 0.975
5th 0.777
6th 0.653
Final drive 3.285

Combines Gear ratios
1st 3.933 * 3.285 = 12.919905
2nd 2.037 * 3.285 = 6.691545
3rd 1.314 * 3.285 = 4.31649
4th 0.975 * 3.285 = 3.202875
5th 0.777 * 3.285 = 2.552445
6th 0.653 * 3.285 = 2.145105

Wheel circumeference = ((225 * 0.45 * 2) + (17 * 25.4)) * pi() = 1992.712mm

Speed per 1000rpm per gear.
1000000 mm/km
1.609 km /mile
60 min/hr
1st 1992.712 * (1000 * 60) / 1000000 / 1.609 / 12.919905 = 5.751 MPH / 1000 RPM
2nd 1992.712 * (1000 * 60) / 1000000 / 1.609 / 6.691545 = 11.105 MPH / 1000 RPM
3rd 1992.712 * (1000 * 60) / 1000000 / 1.609 / 4.31649 = 17.215 MPH / 1000 RPM
4th 1992.712 * (1000 * 60) / 1000000 / 1.609 / 3.202875 = 23.201 MPH / 1000 RPM
5th 1992.712 * (1000 * 60) / 1000000 / 1.609 / 2.552445 = 29.113 MPH / 1000 RPM
6th 1992.712 * (1000 * 60) / 1000000 / 1.609 / 2.145105 = 34.641 MPH / 1000 RPM

Rocks back and forth in chair repeatedly muttering to self!

 

[coste1l]

relic if im working it out right the car will do 174mph at 5k in 6th?? im sure its not that simple

 

[Chip]

So for arguments sake, theoretical speed at 4,500rpm in 6th is 155mph!!! if there was enough BHP...........

 

[Relic]

relic if im working it out right the car will do 174mph at 5k in 6th?? im sure its not that simple

YES

 

[Relic]

so for arguments sake, theoretical speed at 4,500rpm in 6th is 155mph!!! If there was enough bhp...........

yes

 

[Relic]

The figures give you an opportunity to check RPM vs MPH.
See what the RPM says you actually are doing...
..compare to what the speedo kids you, that you are doing

 

[welly]

gentlemen i humbly apologise my car will achieve 85mph in 3rd gear and may have actually gone further but mechanical sympathy prevented it. It certainly isnt the best way to drive it to achieve maximum acceleration but it is possible. im now going to bake a custard pie for my face...........

Absolutely no pie needed Coste, I for one, am in your debt for confirming that my memory isn't totally shot with age!!

Now all we need to accertain is how much power you would actually need to get too the limiter in 6th

Oh, and the whereabouts of your private test track ,

 

[coste1l]

lol its my driveway

 

[Chip]

lol its my driveway

Do we call you Lord Costel now you have a driveway that long!?

 

[coste1l]

"we" always did