Power to Weight Ratios

[ASRF1000]

Some interesting power to weight ratios....

[HastyHorn]

Are all of these with driver?

Hasty Horn

[ASRF1000]

All are with driver, based on minimum weights and published horsepower ranges.

[formulasuper]

Where do FE & FM fit it to the chart?

[ASRF1000]

What are the weights and HP for FE & FM and I can tell you.

[Daryl DeArman]

What are the weights and HP for FE & FM and I can tell you.

LOL

[Brandon Dixon]

SCCA DSR = 4.4 lbs/hp

An SCCA Turbo DSR has the potential to be 3.5 lbs/hp


The best Atlantics have more than "published" HP.....

It's not like any of this should suprise anyone that knows even the slightest bit about these classes.

[Wren]

It's not like any of this should suprise anyone that knows even the slightest bit about these classes.

It's also not a surprise that the best racing in America is in the two classes listed last on that list.

[starkejt]

It's also not a surprise that the best racing in America is in the two classes listed last on that list.

I beg to differ.

http://youtu.be/IcQ6VQtGKZw

[WRD]

Its possible that a slight bit of urine may have left my body watching this.

Great stuff, I think I need a Citation!

I beg to differ.

http://youtu.be/IcQ6VQtGKZw

[starkejt]

Its possible that a slight bit of urine may have left my body watching this.

Great stuff, I think I need a Citation!

Yep, I spit my drink out too the first time I watched it.



Sorry, couldn't resist.

[ASRF1000]

SCCA DSR = 4.4 lbs/hp

An SCCA Turbo DSR has the potential to be 3.5 lbs/hp


The best Atlantics have more than "published" HP.....

It's not like any of this should suprise anyone that knows even the slightest bit about these classes.

The list was made up of open wheel cars not sports racers. The Atlantics stats were from those in the pro Series back when there was one.

Simply just a comparison.

[Wren]

Yep, I spit my drink out too the first time I watched it.



Sorry, couldn't resist.

A while ago the show Tosh.0 found those girls and interviewed them. Hilarious.

[ASRF1000]

Where do FE & FM fit it to the chart?

FM 7.5 lbs / hp

FE 7.35 lbs / hp

[KevinFirlein]

a club FA is in the neighborhood of 4.7 / 1 to 4.9/1 depending on chassis weight

[ASRF1000]

Excellent. Thanks Kevin.

Is that with Driver? Aren't all minimum weights the same in FA Club?

[KevinFirlein]

with driver. weights range from 1230 - 1305 ( well not including anything in the new charts since they got their balls cut off )depending on chassis, gearbox, and EFI or not. I used 1255 which is carbon tub and carbs and 1305 which is carbon tub, sequential box, and efi for my numbers

[ASRF1000]

Great. Thanks!

[bill gillespie]

with driver. weights range from 1230 - 1305 ( well not including anything in the new charts since they got their balls cut off )depending on chassis, gearbox, and EFI or not. I used 1255 which is carbon tub and carbs and 1305 which is carbon tub, sequential box, and efi for my numbers

Hey Kevin,

Are you allowing 265hp for a top 4age.....with little peak hp difference between EFI and carbs ?

Regards,
Bill

[KevinFirlein]

I used the 265 we had at the 03 Runoffs. Same motor just dynoed at 265 on different dyno before this past years runoffs. It was injected.

[JByers]

I used the 265 we had at the 03 Runoffs. Same motor just dynoed at 265 on different dyno before this past years runoffs. It was injected.

Who was the builder and was it a big or small port head?

[nulrich]

The list was made up of open wheel cars not sports racers. The Atlantics stats were from those in the pro Series back when there was one.

The published power for the Mazda/Cosworth 2.3 liter pro Atlantic motor was 280 to 300 hp depending on where you looked. They lapped Road America in the 1:58s, while I believe the FB track record is around 2:08.

I think you should include MTBF and rebuild cost in that table.

Nathan

[bill gillespie]

The published power for the Mazda/Cosworth 2.3 liter pro Atlantic motor was 280 to 300 hp depending on where you looked. They lapped Road America in the 1:58s, while I believe the FB track record is around 2:08.

I think you should include MTBF and rebuild cost in that table.

Nathan

Hey Nathan,

I'm sure we were referring to the 1600 cc FA cars.....not the 2.3Mazda MZR Swift016. The pro version of the Swift 016 ended up a little north of 300hp at a much heavier weight, but in resticted club form is probably around 260 hp at best....still at a heavier weight by th Gomberg, er Club Engine Rules table.

Clear as mud ??
Bill

[nulrich]

Bill:

I was going way back in the thread (sorry!) where Jon Lewis said the Formula Atlantic power/weight ratio was based on the pro cars:

The list was made up of open wheel cars not sports racers. The Atlantics stats were from those in the pro Series back when there was one.

Just wanted to correct his numbers, where he mistakenly claims that F1000 cars have a better power/weight ratio than pro Formula Atlantics. 1418 lbs/300 hp (conservatively) is 4.7 lbs/hp.

Nathan

[ASRF1000]

I stand corrected. I was getting my information as follows:

280 HP - 1,418 weight. If this information is not correct than my calculations are wrong


Specifications

• Chassis: Swift 016.a, Carbon-fibre composite with kevlar, two roll-over structures. No change of chassis during an event.
• Engine Displacement: Cosworth Built Mazda 2.3 L (140 in³) MZR DOHC I-4.
• Gearbox: Swift 5 Speed Sequential Manual Transmission (must have reverse).
• Power Output: 280 hp (209 kW; 284 PS) @ 6500 rpm.
• Fuel: VP Racing Fuels 108 RON Leaded gasoline, no refueling (similar to Formula 3, GP2 Series, GP3 Series, Formula 1 and Formula Renaults).
• Fuel Tank: IMSA homologated rubber safety tank.
• Fuel Delivery: Fuel injection.
• Aspiration: Naturally aspirated.
• Electronics/ECU: Cosworth Electronics Data: Pi Research Sigma/ECU - Pectel SQ6/Wiring - Performance Wiring Solutions wiring.
• Length: 4,498 mm (177.1 in).
• Width: 1,956 mm (77 in).
• Wheelbase: 2,776 mm (109.3 in).
• Weight: 643 kg (1,418 lb), with driver.

[tonyave]

My current Tans-Am car

2780 pounds, 850 HP, 3.27

[Brandon Dixon]

My current Tans-Am car

850 HP

[tonyave]

Thanks to the constant pursuit of power by the Nascar teams one of those can be had for less than 20K with completely new internals. I used one engine last year for the first 6 races, and it still dynoed within 10 HP when we took it out.


However, I do miss open wheel racing, and am VERY interested in the F1K thing. Think I'm too old (42) fat (210), and slow?????


Tony

[starkejt]

My current Tans-Am car

2780 pounds, 850 HP, 3.27

Okay, you win, but someone needs to buy a sprint car and then post in this thread.

[tonyave]

Had some of those when I lived in Indy,

At that time, 800 HP in about 1450 pounds. 1.81

The newer stuff I'm sure is 900 HP, and the cars are about 100 pounds lighter depending on the rules.

Most difficult to drive/ride?? An ice racing snowmobile, 125 HP, 375 pounds.
Makes the Indycar at 220 seem really easy, believe me.

[starkejt]

You say that not having driven my small block, direct drive, methanol burning Radio Flyer.

[rickb99]

Duplicate... erased

[Tom Valet]

My current Tans-Am car

2780 pounds, 850 HP, 3.27

Fire-breathing, too:

[JohnPaul]

2008 gsxr1000 superbike 195hp, 345lbs fun fun fun