The Doctor

[Mux213]

NoHachi,

But the hachi is alot lighter then the MR2 mkII or Supra mkIII asfar as I know.

Still, I am not sure if I'd wanne be going 250+ in my old Hachi, doing those speeds in my Porsche was crazy enough already

[NoHachi]

Mux,

A cars top speed is not determined by its weight.
F=m*a -> acceleration is determined to a great extent by weight. When you look at top speed, the factors limiting speed are air resistance (large impact) and tire/road resistance (Very small). The second factor is the influenced by weight but only marginally. The greatest challenge for a car at speed is beating the air resistance (F=A*f*v^2)
The formula for air resistance depends on: frontal surface (A), drag coefficient (f) and de square of the speed (v^2). You can easily see that the force increases dramatically at speed.

Cars with the same horsepower, frontal surface and drag coefficient wil reach approximately the same top speed (+/-5% difference due to tire resistance). Try and think of some examples, you'll soon see what I mean.
As far as I know a AE86 is an aerodynamic brick with a huge frontal area, so something fishy is going on.

[NoHachi]

Mux,

A cars top speed is not determined by its weight.
F=m*a -> acceleration is determined to a great extent by weight. When you look at top speed, the factors limiting speed are air resistance (large impact) and tire/road resistance (Very small). The second factor is the influenced by weight but only marginally. The greatest challenge for a car at speed is beating the air resistance (F=A*f*v^2)
The formula for air resistance depends on: frontal surface (A), drag coefficient (f) and de square of the speed (v^2). You can easily see that the force increases dramatically at speed.

Cars with the same horsepower, frontal surface and drag coefficient wil reach approximately the same top speed (+/-5% difference due to tire resistance). Try and think of some examples, you'll soon see what I mean.
As far as I know a AE86 is an aerodynamic brick with a huge frontal area, so something fishy is going on.

[The Doctor]

SW20 weighs about 1215 kg, Supra MK3 weighs 1615kg

Thats a big diffence with the AE86 wich weighs (with de 3S-GTE) about 1000kg.

And an other big difference is the final ratio (or something like that , in dutch its called 'eindreductie' i don't know the exact translation of that ).

When i'd had that 240 km/u taxi-ride i saw that it 'wasn't hard' to drive it, even at higher speeds.
A big difference with the Opel Corsa A 2,0 16V in wich i drove with earlier. when he hit the throttle, he had to use all of his capacities to keep it going in a straight line

[Ivan141]

I agree with NoHachi on the weight factor...it is not very important at speed. BTW, ad is using a stock ae86 rear axle, and thus has the same end reduction/final drive. The supra gearbox will only add a little bit of top speed. Now I know Ad (the owner) to be a down to earth kind of guy, soif you could get him to visit the forum this discussion would have a lot more purpose.

[The Doctor]

When i see him, i'll ask him.
But i don't know when that is, because i don't see him very often.

Sending an email won't help either, he is very rarely online

[Jan Pedersen]

mux213 Wrote:NoHachi,

But the hachi is alot lighter then the MR2 mkII or Supra mkIII asfar as I know.

Still, I am not sure if I'd wanne be going 250+ in my old Hachi, doing those speeds in my Porsche was crazy enough already

The fastest hachi in Denmark does 262 km/h with 2000 rev/m to go It has a 4AGTE engine with 440+ hp, BMW M5 transmission and Celica diff. Its actually quite driveable :o but noisy... It can be done
This is the one:

[NoHachi]

Ah, thats the guy that makes all those nice manifolds, no? What does he charge for his work? Ask him to join the boards, a little publicity might be good for him as wel.

[Jan Pedersen]

The guy who made it doesnt own the car... But I will mention it to him

Well I actyally dont know how much it costs. He says: " If you have to ask, you cant afford it" I know that its rather expensive - everything is handmade

Oh I forgot to tell you that it made 440 hp @ only 1,4 bar

[The Doctor]

That's pretty odd, using a 4A-GE for building a Turbo set-up...

Most 4A-GTE's i see are based on the 4A-GZE engine