lol @ dodging questions...
All will be reveiled, but I just wanna say just yet - but I can guarantee you that I'm not going to anything naughty lol
Printable View
lol @ dodging questions...
All will be reveiled, but I just wanna say just yet - but I can guarantee you that I'm not going to anything naughty lol
for once :pQuote:
Originally Posted by trackdaynova
second that.:thumb:Quote:
Originally Posted by LiquidPug
Olly is fitting Rick Drapers engine, its no secret
After speaking with Lee & nova ian for a rather long period of time last night, I've decided not to sell my box after all, and they made me realise the mistake I would have made had I have gone through with it, and how I would have regretted it.
To get over my annoyance with the box, which is the fact it's a PITA to travel anywhere, due to the gearing, I've decided I'm going to follow what Chris Tunnicliffe did to his to make his more bearable on the road, and travelling to and from circuits.
I will be fitting a helical 5th gear which means no more whining for hours on end, better fuel consumption (on a run) to boot, and less strain on the block so no more sitting at 4.2krpm at 70mph.
I called Quaife today who were more than helpful when discussing my options, so I used their speed calculator to work out what I wanted to achieve.
Firstly found out the rolling circumference of a Toyo 888, 195-50-15 tyre using AlloyWheels.com, which works out at 1809.56mm
So here is my current box details:
Gearbox:- My current gearbox
FD Ratio:- 3.764
Tyre:- Toyo Proxe 888, 195-50-15
----------------------------------------------------------
Top Gear gives 17.234 MPH/1000 RPM and a top speed of 133.565 MPH at 7750 RPM
Engine speeds in top gear:-
30 MPH = 1741 RPM 40 MPH = 2321 RPM 50 MPH = 2901 RPM 60 MPH = 3481 RPM
70 MPH = 4262 RPM 80 MPH = 4842 RPM 90 MPH = 5422 RPM 100 MPH = 5802 RPM
Top Speed in 1 gear = 54.688 MPH
And changes into 2 gear at 5370 RPM dropping 2380 RPM
Top Speed in 2 gear = 78.925 MPH
And changes into 3 gear at 6253 RPM dropping 1497 RPM
Top Speed in 3 gear = 97.823 MPH
And changes into 4 gear at 6495 RPM dropping 1255 RPM
Top Speed in 4 gear = 116.729 MPH
And changes into 5 gear at 6773 RPM dropping 977 RPM
Top Speed in 5 gear = 133.565 MPH
Using good old Wikipedia for information, the most common F20 gearbox found, will have a 3.55 FD, and a 5th gear ratio of 0.89:1 (currently using a straight cut quaife 1.040 5th gear)
Should I go for that option, and fit a final drive and 5th gear from a standard F20 box, it will give me these figures
Gearbox:- Ideal gearbox
FD Ratio:- 3.55
Tyre:- Toyo Proxe 888, 195-50-15
----------------------------------------------------------
Top Gear gives 21.353 MPH/1000 RPM and a top speed of 165.485 MPH at 7750 RPM
Engine speeds in top gear:-
30 MPH = 1405 RPM 40 MPH = 1873 RPM 50 MPH = 2342 RPM 60 MPH = 2810 RPM
70 MPH = 3278 RPM 80 MPH = 3747 RPM 90 MPH = 4215 RPM 100 MPH = 4683 RPM
Top Speed in 1 gear = 57.985 MPH
And changes into 2 gear at 5370 RPM dropping 2380 RPM
Top Speed in 2 gear = 83.683 MPH
And changes into 3 gear at 6253 RPM dropping 1497 RPM
Top Speed in 3 gear = 103.719 MPH
And changes into 4 gear at 6495 RPM dropping 1255 RPM
Top Speed in 4 gear = 123.766 MPH
And changes into 5 gear at 5796 RPM dropping 1954 RPM
Top Speed in 5 gear = 165.485 MPH
Alternatively, I can scrap changing the Final Drive, from 3.55, and just keep my current 3.764, and change 5th gear to a 0.89:1 from a standard F20, to get these results
Gearbox:- Optional gearbox
FD Ratio:- 3.764
Tyre:- Toyo Proxe 888, 195-50-15
----------------------------------------------------------
Top Gear gives 20.139 MPH/1000 RPM and a top speed of 156.076 MPH at 7750 RPM
Engine speeds in top gear:-
30 MPH = 1490 RPM 40 MPH = 1986 RPM 50 MPH = 2483 RPM 60 MPH = 2979 RPM
70 MPH = 3476 RPM 80 MPH = 3972 RPM 90 MPH = 4469 RPM 100 MPH = 4966 RPM
Top Speed in 1 gear = 54.688 MPH
And changes into 2 gear at 5370 RPM dropping 2380 RPM
Top Speed in 2 gear = 78.925 MPH
And changes into 3 gear at 6253 RPM dropping 1497 RPM
Top Speed in 3 gear = 97.823 MPH
And changes into 4 gear at 6495 RPM dropping 1255 RPM
Top Speed in 4 gear = 116.729 MPH
And changes into 5 gear at 5796 RPM dropping 1954 RPM
Top Speed in 5 gear = 156.076 MPH
By doing the above, obviously I remain the same acceleration as I currently have, but have a longer top speed, and a quiet 5th gear... but lower RPM in in 5th at each speed
decisions decisions...
I do have a F18WR sitting here doing nothing, which has a 3.55 final drive, but I've just done some research and the 5th ratio is 0.74:1 lol which would give me the best part of 3k drop when changing into 5th. This isn't an option, due to me using 5th on most circuits, altho that does come with a possible 176mph apparently if I had enough power to get me there lol lol lol
Just changing 5th sounds like the best idea to me.(to 0.89 ratio)
id go for changing the 5th as adam said.
This one
Gearbox:- Optional gearbox
FD Ratio:- 3.764
Tyre:- Toyo Proxe 888, 195-50-15
----------------------------------------------------------
Top Gear gives 20.139 MPH/1000 RPM and a top speed of 156.076 MPH at 7750 RPM
Engine speeds in top gear:-
30 MPH = 1490 RPM 40 MPH = 1986 RPM 50 MPH = 2483 RPM 60 MPH = 2979 RPM
70 MPH = 3476 RPM 80 MPH = 3972 RPM 90 MPH = 4469 RPM 100 MPH = 4966 RPM
Top Speed in 1 gear = 54.688 MPH
And changes into 2 gear at 5370 RPM dropping 2380 RPM
Top Speed in 2 gear = 78.925 MPH
And changes into 3 gear at 6253 RPM dropping 1497 RPM
Top Speed in 3 gear = 97.823 MPH
And changes into 4 gear at 6495 RPM dropping 1255 RPM
Top Speed in 4 gear = 116.729 MPH
And changes into 5 gear at 5796 RPM dropping 1954 RPM
Top Speed in 5 gear = 156.076 MPH
As it will give you more scope for a more powerful engine yet still retains a nice drop of the revs on every gearchange.
I'd still like to put 2 identicals cars on track one with sccr and one with a F20 to see how they fair against each other considering what we worked out.
I'd say the swap in FD will definately make a big difference though and the helical 5th won't make it so aggressive on the drive to the ring next year ;) (as you have no excuse not to come now lol)
The ring trip is the main reason I'm doing it lol
Obviously among wanting to go Coombe, Oulton, Brands etc :)
or you could leave it as it is and stick it on your trailer the lazy option:D