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T5 owners, RPM @ 100kms? 

 

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Posted: Sat Jun 30, 2007 9:56 pm 
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Here's a speed calc for tyres sizes versus diff ratios and g'box ratios.

 

 

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Speed calculator with example.jpg
Speed calculator with example.jpg [ 353.25 KiB | Viewed 20 times ]

 

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Posted: Sat Jun 30, 2007 10:42 pm 
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same picture as in the first page of the same post!

 

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Posted: Sun Jul 01, 2007 7:48 am 
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Yes that formula does work when you muck around with that 'constant' figure until you get a baseline for your car. For example i had to change the constant from '3' to '2.86' for it to read 2100rpm @100km/h.

An easy and quick way ive found, if you want to just change diff ratios, and wanna know how many revs at 100km/h for example....

2100 rpms @100km/h with 3.23 diff at the moment but i wanna change to 3.73's

So, 2100 divided by 3.23 then multiplied by 3.73 equals 2425rpm @100km/h

Easy.
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Posted: Sun Jul 01, 2007 7:03 pm 
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not sure of my diff i think its 3.08 single spinner

i get 1800rpm at 100kmh but im not sure how correct my speedo is
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Posted: Sun Jul 01, 2007 7:25 pm 
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in 5th at 100 im on 1700 with 2.92:1
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Posted: Sun Jul 01, 2007 7:40 pm 
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my ef does 1800 and its jsut and 4 litre with an single spinner

 

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Posted: Sun Jul 01, 2007 11:42 pm 
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my ed auto does 2250 at 100 with 4.11s
and that site agrees as well

 

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Posted: Sun Jul 01, 2007 11:44 pm 
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Smokey...Retired! wrote:
THere must be different ratio t5's cos mine is on 18's aswell :s


The T5 has been used in a few cars, and there is a few ratio sets getting around. I thought ford only had 2 in the 6cyl's from EA to AU.

My car used to sit on 1800 @ 100 with the same diff & 235/45 17's when it was auto. Only 200rpm higher with the 5spd in, and i have not noticed any worse fuel consumption, even tho i do tend to give it a bit. On petrol the consumption is better, but i'm yet to get the LPG ECU retuned to suit the engine mods, so it's economy is as before. It's a little rough on lpg as well atm.

Cheers

ToranaGuy

 

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