so here goes I want to go 200mph in my minor the engine at the mo, rover SD1 is not up to it, could I or should I try and build a screaming rover block turbo/supercharge /NOS it and try to get BHP enough to take the car to that speed
or go the LS route, I want to stick to a manual box what ever engine running gear will stay XJS
your thoughts would be nice, but don't bother saying I can't 'cause I'll prove you wrong!
I managed a 147 in my MGB GT with the 3500 lump and a 75 shot of gas.
But I reckon the jump from 150 to 200 will take a good bit of power given the shape of the Moggy.
I havent tried a top speed run im my MGB with the new 4.6 mind as I've swapped the 4+OD manual for a 3 speed TH350.
I would say for a speed run, Nitrous would be the way to go for the quick torque output gains to get you up there.
But you would need to be able to take the Moggy up to about 140 without gas I reckon. Depends what internals you are running I suppose.
for the 200mph run you need a good bit of torque from the base engine before you add the gas.
Where do you plan to try this run?
How long a run up are you planning before you hit the speed trap?
Perry Stephenson
MGB GT + Rover V8
9.62 @ 137.37mph
Now looking for 8 seconds with a SBC engine
http://www.youtube.com/watch?v=nVscbPHgue0&list=UUqIlXfSAoiZ--GyG4tfRrjw
for this i would be simply aiming for big BHP and also highish RPM because your goign tio have to gear your car for 200mph to, you would want to find its peak bhp and set the gearing for 200mph @ peak bhp,
big engine, lots of revs, long legged gearbox, turbo be good and very big balls!!!
I dont believe for 1 second, that 500bhp will take a Minor to 200mph, even if you had 10 miles to do it.
There are dozens of Cossies out there, with well in excess of 500bhp, that cant achieve it, and they are aerodynamic.
Quite a few Skylines too, Evo's, Subarus etc. All modern cars, easy to make power, in modern aerodynamic bodies.
Plenty of cars at TOTB, which although distance has dropped over the years from standing 1.25mile, to a now shorter 1mile....
There are only a handful of cars that have achieved 200+ over those distances
Take a look at the results of the V-Max events from Pistonheads, and see how many supercars achieve a genuine 200+
It is no easy task, and I doubt a conventional Rover V8 is capable of making the power to do it, unless you had an incredibly aerodynamic car.
Not wanting to sound pessimistic, just being realistic based on what Ive seen etc
bill shurvinton wrote:drag increases to the cube of velocity.
Drag increases (to first order at least) in direct proportion to the velocity. So the linear differential equation expressing the motion is
mass*velocity=Force-Drag, whose solution is something like 1-exp(-t)) which tends to 1 as t tends to infinity (or whatever the terminal velocity is). The velocity versus time graph will then get exponentially close to the terminal velocity.
I have no idea what power you will need to get a moggy to 200, but i'm sure you could do it with enough dosh.
Don't buy that. It's been a while since I did fluid mechanics (actually 20 years), but I think you are talking about the equations for a small body, not a large one?
have to say i think short wheel base and bad aero dynamics might be the biggest problem, but the difference between a very un aerodynamic car and a very good one isnt huge, between 0.3-0.4 drag coefficient so shouldnt be to much of a problen like that, but its just youmight turn over spin an die when a gust of wind hits you!
Nice little graph in my old Staniforth book says that you will need circa 550 RWHP to get near 200mph - with some allowances for transmission losses - I would look at a engine output of 700bhp so that you could allow for abit of a head wind. Similarly you will need a good aero package to help keep it on the ground and that adds drag and that will cost HP.
Hmmmmm 700BHP Rover may need a bit of work - Bills way looks favorite.
Well on the wheelbase issue the shortest I've found was the toyota corolla that did 200
there was a fifth gear special that showed a cossie and the corolla doing 200
I would like to keep the rover engine maybe a 5.3 litre twin turbo maybe but I could go the LS route. my budget is around 5k but thats staged(wife!)
I would go for the 6.0 l iron block truck motor as a base motor, the heads are best on this one for the money (L96 I believe). It will give you the best combination of strength per pound spent. But with onlly 5K budget you'll need alot of luck to get a moggy up to 200mph.
Mike
