951 ABCA

They both look like they're spinning to me. I'm sure its just an artifact of the highly compressed visuals.

Porschefile

Nice try their buddy. I certainly hope you are kidding. In reality, that F40 makes north of 700+rwhp (they make over 400rwhp stock for God's sake!), and that most definitely was ~10,000rpm. I am not 100% certain, but I'm thinking that particular F40 is John Carmack's. He's the guy that created the Doom videogames. If it is, his F40 is built by Norwood and makes 1000rwhp.

These vids are 10x better:

Vid 1
Vid 2

That's a 1 out of 3 F50 Gt1. It has a 4.7 v12 n/a, 750hp, weighs 2000lbs, redline is 11000rpm.

fourside

Oh, I love the GT1. It's absolutely ridiculous though - a beast.

rberry951

I LOVE these videos, keep 'em comin!

Kit_Chris

Both F40 videos show open wheels, the left wheel does look immobile, if it's locked and the differential is open, all power is going to the free wheel, on the right, although I seriously doubt this kind of power could do without a proper LSD!

Regards,
Chris

hosrom_951

Hmmm.........wish i had a video camera of Mohammed Bin Sulayem (GCC Rally Champion) dropping the clutch of his F50 at 8,000rpms....made his 959 and jaguar XJ220 look like ***** cats

special tool

The car in that vid has nowhere near 700 RW, or it is running very low boost
It takes too long to spin the rollers. Trust me.

RolexNJ

Pop Quiz: Why were there only 3 GT1s ever made? And I sat in one of them back in 1995 at an annual Ferrari meet.

SamGrant951

I read somewhere that they built one and the other two were made from spares of the first...such a cool car. (Is that true?)

RolexNJ

Nope. Decent guess though Sam. And it is was a bad-*** car. Sweet sound!

testarossa_td

I only remember seeing his F50 and Twin Testarossa at Norwoods....I guess he might have done it to an F40 as well.

Here is a norwood twin tr.



https://rennlist.com/forums/924-931-944-951-968-forum/298352-italian-carfest-with-a-spot-of-german-not-so-56k.html

Laust Pedersen

Very impressive dyno run. It is actually possible to get a good sense of the rpm by listening to the exhaust, converting the fundamental frequency to Hz and divide by 4 (4-stroke 8-cylinder engine). That assumes the video plays at the right speed. Unfortunately I don’t have time to do the analysis right now.

The run was apparently done in 5th gear, but without knowing the inertia or resistance setting of the dyno, it is impossible to estimate the HP or TQ delivered (based on the rate of frequency change).

Lastly it seems that there is a significant tire growth with speed, although some of the lift could be caused by the angle of the straps.

Thanks for posting, fun to watch.

Laust

RolexNJ

Laust: Why would they do it in 5th gear? Educate me, without getting way to technical?

Laust Pedersen

My guess is that the tires would slip on the dyno rollers (relatively light car) if they used a lower gear.
Hope that wasn’t too technical.

RolexNJ

You're funny. But by doing that, does that skew the proper reading? I mean, doesn't that affect spool up. Would the gear that they are in for a pull be a different gear that we would do for our cars? Just curious.



PS. That wasn't to technical, but if you want to go into more detail Laust, please try, even though it might fly over my head!