No idea about my wrx (don't want to tempt fate and blow it up) but my bike :-) 185bhp, 189 kg (just the bike not me as well) and a 6 speed box I've had on gps in Germany on the bahns after riding to the german motogp 189mph and it was still pulling but I **** myself and backed off. Power, gear ratio, weight and aero dynamics all play an equal part in things. Kinda the same as jet engines, put 4 rolls royce olympus gas turbines on concord and she constantly crused at 1334mph, put the same engines on say a 747 and well explosions, wings ripped off and nowhere near the same speed. All of the above need to be addressed to get the desired outcome.

 

Ok paul lol

Regarding bikes, i used to have a yamaha thundercat, 600cc...

Topped that out at an indicated 165, it was std tho and the book speed was 155...

Of course, that wasnt pulling to the reline with its 100hp but wouldnt go any faster...hmm, couldnt have been a lack of power so must have been the drag! Lol

 

Exactly. These things need to be designed from the ground up really. Most 180-200 mph cars out there are a radially different design and shape to an impreza

 

What does andy forrests car do top end? Can do 170+ in the 1/4 lol

 

And that's pretty much been designed from the ground up to do what it does. Try using it as a road car or daily driver

 

That's what I thought

Who needs all those pointless spoilers and scoops

1.6GL will do 170mph

 

I'd imagine 210, we may just find out in 2 weeks

 

What can it do on a top speed run more like, To get an idea of drag or the force you have to push through the air to max your gear box....Stick your hand out of the window at 100 mph

 

Ive always understood in most cases a big wear wing is for down force to increase corner speed. The trade off being it robs top end. Isn't that why some super cars have a wing that folds away?

 

Good stuff

TOTB?

 

https://www.google.co.uk/search?q=to...&client=safari

2 weeks time

 

The speedo gets less precise as you reach the highest speeds, and most cars which have a bit of power are in reality limited by effective final drive ratio which is a function of wheel size and final drive ratio in the diff. What this basically means is that in your 400 bhp Impreza you will be hitting the limiter at say 160 mph, and you will find yourself with no more gears to upshift too.

It's only the big supercars and GT cars that tend to come with the long gearing which makes 200 mph speeds possible, assuming you have the power.

 

I bet the final drive ratio makes it a pig to drive on the road. It will probably be off boost constantly and be either revving it like a granny in 1st to do 30 mph or like 1,500 rpm in 2nd or something.

 

Driven off a cliff it might.

 

You lot have got it all wrong...

Everyone knows that some ropey 1.8 would easily get to 180mph. It does not matter on the gearbox, power, aerodynamics etc.












Just as long as it says AVIS in the window

 

A white Astra 1.7D van will still be up your bootlid however fast you're going.

 

Top speed is all pub talk.

Imprezas have always been about fast accelerating B road weapons.

If you want top speed move abroad and don't buy an Impreza, even if a big build will comfortably see 170+.

A boggo 911 with 340bhp will usually see somewhere around the 175mph mark, let alone if you throw some money at it.

 

when i was a service engineer driving a van my used to say "no matter how fast your going, there is always some c*nt trying to go faster... and its usually fudgey"

lol

 

I don't think so, because of terminal velocity considerations.
The cliff would probably have to be extremely high, possibly so high that the driver would need a pressure suit (how the engine would breathe I don't know).

Felix Baumgartner achieved 850mph on his epic parachute jump.
But he was about 20 miles up.

 

Interesting topic.
In my Hawk STI I have seen 157mph on a TomTom (off the clock on the dash) and it got there relatively easy enough. The engine has been rebuilt and forged but that's it, not re-mapped or anything so still got the standard limiter fitted (UK car not JDM).

I didn't sustain this speed for any length of time for 2 reasons A) I was scared the engine would go bang (read the stuff about the bonnet vent being relatively useless at high speeds) and B) as a few of you have said the bonnet started wobblying about!
The above was carried out on the autobahn so no need for the internet police to get excited

It's interesting to hear what it could reach in it's current form with the limiter removed and without the engine going bang! And equally as interesting to hear what it could achieve with removal of the rear spoiler, bonnet vent and TMIC swapped to FMIC.

 

There is actually a thread on here or maybe 22b where some of the non-retard big power boys talk about pushing 200mph, think it was when the likes of Andy F was getting close.

It mentions somewhere about the extra power required to overcome the coefficient of drag of an Impreza, there was if I remember correctly some equation with regards the extra BHP required to push through the air envelope which was basically like trying to break through a brick wall that's moving at the same speed you are, if that makes sense, along with the drag.

But as stated there is soooooo much more to consider than power and gear ratios, even if you have both you still won't get there because of aero dynamics, your probably more likely to take off and flip over like the first Audi TT's were doing a few years ago, that's if the bonnet doesn't come through the screen and decapitate you first.

And all you top speed boys, there are also a few threads about the rear spoiler, which effectively equate to it being more of a hinderance than a help, which is probably a big part of the reason my old small spoilerd WRX would go off the clock.

 

I am surprised swap shop members haven't been decapitated by chavvy bits of their sheds coming off at 120mph

 

I wonder what speed/resistance it actually takes to get a standard impreza bonnet catch to fail?
It's something I never thought about in any of my previous cars until I saw my bonnet quivering on the Impreza.

 

There were quite a few incidents of it happening on classics, and the worst thing about it is they don't actually get ripped off, they go all the way back covering the screen and bend onto the roof, which can't be much fun at 120+ trying to see where your going through a bonnet.

Just to add a side note, I'm no physics expert, but I have watched The Last Indian there are also other factors such as wind speed and direction, air density, ambient temps and just when you think you got that right the odd gust thrown in for that high speed wobble at 150+ make it very difficult to get past about 180mph, then there's the fact the the world goes by pretty quickly at those speeds, I've been up there once on a bike and it takes a bit of getting used to beyond 150/160mph

 

Used to do the same on my 997 Carrera S. Never had any problems with that.

Not that it ever went north of 70mph of course

 

Obviously lol!

The arguement there is that the bonnet on the Porsche doesnt run right to the end of the nose as far as I'm aware? So air hits the bumper and is already on its way up over the bonnet before it reaches the leading edge of the bonnet.
With the Impreza the edge of the bonnet IS the nose so that leading edge immediately has air rushing under it directly.

 

Well if your bonnet does happen to come up at high speed, just box it back into place and roll on

 

Never thought much about the join on the 911 being set back, this could be a big problem for cars tuned to higher speeds without reinforcing the bonnet pins.

However I already have a solution.

Fit a terrible Bodykit and VTA dump valve and pick up some smoking hot chicks from McDonalds. Then get them to sit on the bonnet!

 

There's very few Impreza's that will crack the double ton, Andy has.

Taken from his signature on 22B - 0 - 202mph in 15 seconds

That was his old car though, the new one he blew a door off at Marham @ around 197 mph. IIRC, he wasn't even at the half way mark when it happened and he had a passenger in the car.

Also Steven has in the Banana.

 

Micky the 0-202 in 15 secs is the new one did that at TOTB last year, this is taken from Andy's site (old car)

2008 draws to a close and our car remains unbeaten on top speed (210.2 mph) and 1/4 mile records for a UK Subaru.