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gear speads (fao clever people)
Posted: Sat Jun 13, 2009 3:11 pm
by rob_htid
what is the actual topspeed the car can run at 6750rpm in 5th on a non sport 325i gearbox and a 3.64 diff - standard tyre size
thanks Rob!
Posted: Sat Jun 13, 2009 5:32 pm
by StuBeeDoo
162.675mph. You'd need mega power to get it there though.
24.1mph/1000rpm in 5th.
Re: gear speads (fao clever people)
Posted: Sat Jun 13, 2009 5:33 pm
by march109
23.390 MPH/1000 RPM and a top speed of 157.884 MPH at 6750 RPM
Assuming 5 gear is 0.84
Tyres 205 55 15
Re: gear speads (fao clever people)
Posted: Sat Jun 13, 2009 5:37 pm
by StuBeeDoo
march109 wrote:Assuming 5 gear is 0.84
My owners manual says 0.81.
Re: gear speads (fao clever people)
Posted: Sat Jun 13, 2009 5:48 pm
by march109
StuBeeDoo wrote:march109 wrote:Assuming 5 gear is 0.84
My owners manual says 0.81.
In that case you are correct I didn't have a manual to hand and used the figures for a Getrag 240/5
Re: gear speads (fao clever people)
Posted: Thu Jun 18, 2009 7:18 pm
by rob_htid
what about if my diff was a 3.15 wich it is looking like it will be now?
thanks
Posted: Thu Jun 18, 2009 8:32 pm
by StuBeeDoo
187.96mph.
You'd need mega-mega-power to get it there! 
Re:
Posted: Thu Jun 18, 2009 10:16 pm
by rob_htid
il give it ago ;)
Re:
Posted: Thu Jun 18, 2009 11:45 pm
by e301988325i
Manufacturers set speedos based on a 3% tyre slippage on the road, which might be worth bearing in mind if your sat-nav says different. . . but with 750bhp you'll have broken something before you get there
Re:
Posted: Fri Jun 19, 2009 1:10 am
by gareth
does anyone have any specs of gear ratios on BMW boxes? in my case, E34 M30 530 and 535i boxes are of interest
ta!
Re:
Posted: Fri Jun 19, 2009 7:10 pm
by rob_htid
you guys have no faith in me do you lol
Re:
Posted: Fri Jun 19, 2009 8:08 pm
by StuBeeDoo
rob_htid wrote:you guys have no faith in me do you lol
IIRC there was one car on here that was timed with proper gear and got to 165, but that had over 300bhp.
I'm no expert, but I'd have thought for every 10mph above that figure, you'd need another 100bhp.
Re:
Posted: Fri Jun 19, 2009 10:35 pm
by rob_htid
i should piss it with 750bhp then. we will see. il do a build thread when its done, not to far off now