RCS1: Group 6 Prototype-Sports Cars (Racing Challenge Series) ((FINAL REVIEWS NOW OUT!))

1967 CESMA 38-8 LM

The French firm CESMA has announced that they will be entering the Group 6 Prototype series at LeMans for the 1967 season. Years of extensive testing has brought forth a lightweight race car featuring a space frame chassis and hand-formed aluminum body panels. The finished race car tips the scales at only 864 kilograms.

A major focus was taken care on the car’s aerodynamics, resulting in a car that is capable of slipping through the air while still being stable at high speeds. Testing at LeMans has shown the 38-8 LM capable of reaching 330 kph on the Mulsanne Straight.

Mounted midships in the chassis is a 3.8 litre DOHC V8 engine. With a high compression ratio, tubular exhausts, and a mechanical fuel injection system feeding into each cylinder, it is able to make 362 horsepower at 7,600 rpm and 365 Newton meters of torque at 6,800 rpm. Mated to a 5 speed transaxle, the 38-8 LM does 3.18 seconds to 100 kph and a time of 19.6 seconds in the standing kilometer.

The engineering team at CESMA are confident at the prospects of finishing well at the grueling 24 hour race this coming year.

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"Oh, there ain't no rest for the wicked Money don't grow on trees I got bills to pay I got mouths to feed There ain't nothing in this world for free" Le mans car is doing le mans things (also trying out different image editing software lmk if you see a difference)

Specifications

Revuelto’s first foray into group 6 racing!

Revuelto started out as a small automaker making cars such as the Castanya and the bigger more Grand Tourer brother being the Ottavio. It’s 1967 and Revuelto’s engineers wanted to see the limits of the T67.

Although for some of the prototype cars made it gathered quite the nickname when testing. Dubbed “Eris” after the Greek goddess of strife and discord, the car gained a reputation for its unpredictable nature, it’s as if it “possessed” the driver while bringing misfortune to those around it.

This example has the F4BGVIII engine which is a 3.6L flat crank V8 with 352HP and 263lbft. Allowing the Eris to go from 0-100kmh in 3.7 seconds and a top speed of 282km/h.

Top speed is lesser than it’s competitors but, it makes up with in the fact that it weighs in at 1 metric tonne (1002kg) and with it’s mid engine configuration it makes quite competitive on track. With 1.18g on the 20m circle test and 1.20g for the 200m circle test It’s all thanks to it’s wide rear tires of 16" by 285mm and 16" by 235mm at the fronts.

In layman’s terms, it’s fast but it can also handle really well around the chicanes.

Interior wise you don’t get things like air conditioning nor do you get radio but who needs that when you can listen to the sweet roar of a LM prototype. All you really need is that 5 speed transmission a race clutch LSD and you are ready to go off to the races.

Exterior wise the T67 features a deep blue and orange stripes and things such as air ducts vents and a functional rear spoiler attached to the rear end of the car and the front has also received an extensive make over with an air-dam up front all to generate downforce. The 4 spoke wheels are accentuated with gold spokes to match how the livery and how wild the car looks.

Do you have what it takes, to drive this Eris?

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Di Inferi 416 LH (Aerodinamica Series): A Legacy of Innovation and Speed

Di Inferi, the legendary Italian marque, has once again pushed the boundaries of endurance racing with the introduction of the 416 LH, the latest evolution in their storied Aerodinamica series. Designed from the ground up with the engineering prowess of its predecessor, the 320 GTLM Aerodinamica, the 416 LH represents a bold step forward in the pursuit of aerodynamic perfection and racing dominance.

The 416 LH is a testament to Di Inferi’s relentless focus on innovation. Its extended rear end, featuring a meticulously crafted long-tail design, was born out of countless hours of wind tunnel testing and on-track refinement. The rear wheel covers, a hallmark of the Aerodinamica series, were reimagined to reduce drag while maintaining stability at blistering speeds. The car’s open glass concept was a revolutionary choice, offering drivers unparalleled visibility and awareness—a critical advantage in the grueling 24 Hours of Le Mans.

When the 416 LH takes to the track at Daytona, its design shines even brighter. The absence of a steeply angled roof eliminates the need for additional windows, simplifying the car’s construction and reducing costs. This clever design choice also allowed Di Inferi’s engineers to rethink the car’s airflow dynamics. With no room for a traditional top-mounted intake, they turned the engine layout on its head, positioning the exhaust on top of the V12 and placing the intakes on the sides. This innovative configuration not only improved cooling efficiency but also enhanced the car’s overall balance.

The 416 LH is the fourth iteration of the Aerodinamica series, a lineage that began in 1950 with the 190s Aerodinamica, an open-top, front-engine V12 that made waves at Le Mans. It was followed by the 290LM Aerodinamica in 1960, which retained the open-top design and front-engine layout but introduced new levels of performance. The third chapter came in 1965 with the 320 GTLM Aerodinamica, a closed-cabin, mid-engine V12 that redefined what a race car could be. Now, the 416 LH continues this legacy, offering a long-tail variant (the 416 S being the standard version) that embodies Di Inferi’s commitment to speed, innovation, and endurance.

The Aerodinamica series has always been about more than just racing—it’s about pushing the limits of what’s possible. From the 190s to the 416 LH, each car has been a masterclass in engineering, blending cutting-edge aerodynamics with raw power. The 416 LH, with its 6.8-liter V12 engine, 620.1 horsepower, and 478.8 lb-ft of torque, is no exception. It’s a car built to dominate the track, whether at Le Mans, Daytona, or beyond.

The car when though alot of iterations before locking down the the version you are seeing

Aero testing


Yarn and tape goes along way to showing airflow

Di Inferi’s engineers have poured their passion and expertise into every detail of the 416 LH, from its space frame chassis to its rack-and-pinion steering and dual-circuit disc brakes. The result is a car that’s not just fast but also reliable, a true endurance racer in every sense.

As the 416 LH takes its place on the grid, it carries with it the spirit of Di Inferi’s racing heritage—a legacy of innovation, speed, and the relentless pursuit of perfection.

Collab between @Kanye_West & @Xepy
Extra Photos










Engine







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Question: How do i calculate “tire profile”
(also are “roof chops” legal?)

Check the first number after the forward slash (not the one before it - that’s the tire width) in the Parameters section of the wheel/tire trim tab - that one refers to the tire profile on that axle.

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Yep, as abg stated, it’s the second number on the tire size shown in the wheel tab.


For this challenge, that number shouldn’t be smaller than 30.

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Thank you two for explaining that query really well!

As in a chop top? Like found in Midnight Club games? I don’t really see it making sense for the era whatsoever. If you mean roofless/roof is chopped completely off, there was open top racing machines of this age sure but they were usually the hardcore Group 7 prototypes, irrelevant here as you may see in the inspiration :+1:

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i mean as in taking a body with a roof and making it an open top using cutouts and fixtures (something like the Riley & Scott Mk III, only for this period)

Truly iconic

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The Minges Mk.1
Built in a Midwestern speed shop, the Mark.1 was designed for high speed cornering, and overtaking.
Using a 3.9l V8, and 5 speed manual transmission – the 1967 model can reach near 200 MPH speeds.

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Just over 12 hours left before the entries close! Good luck everyone! :muscle:

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1967 Cobalt SP-66b Langheck


Summary

Cobalt’s SP-66 has already made the rounds the year prior but for this '67 season they have designed this b specification, a solution to past failures and a more well rounded package that’s perfect for private customer teams.

Cobalt focused on two main areas to perfect their prototype; the engine, and the car’s bodywork.

The previous season’s 3 litre engine has been punched out to 4 with a focus on power and gaining a bit more reliability for the longer distance challenges it may face.

For the bodywork, first Cobalt changed the front headlights with an increase in size and positioned higher on the car to assist in night time visibility. And finally the rear clam shell was extended, attempting to both decrease drag and to accommodate the suspension driven active rear spoiler. The rear spoiler is linked to the rear suspension arms via a series of linkages and will change the spoiler pitch during hard braking and cornering with the idea of shortening braking distances and to possibly increase cornering forces.

Extra

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Here I present to you the 1967 Jabberwock Magnus 770 LMR Group 6 sports racer






This machine was powered by a 7717cc Quad cam V16 making just shy of 560hp mated to a 5 speed gearbox capable of of sending this machine to a top speed of 204 Mph

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Photo mode is not cooperating rn, so here’s a provisional ad so I don’t get binned. Better one coming tomorrow.

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Just so im not being stupid, all car tire types are allowed as long as they dont have a profile lower then 30 yes? (eg: the race tires)

1967 AMR A602/2

Built by the AMR Racing Team (based in France, Limoges) for the 1967 Sportscar Championship, the A602/2 is the long tail version of the A602.

Powered by a V8 from Tramontane (French engine maker), most of the engineering time has been put into the reliability of the car.

However, the developement of the A602/2 has been rushed through the season, and mostly served as benchmark for the future 70’s AMR Endurance Prototype.



(off lore details : sorry to Kanye i didnt got the time to change the numbers, the 77 was here since like 20 days)

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Sadly no, rules state only allowable tires are cross ply hard compound racing slicks.

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Zacspeed 875 Mk2 LTS

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Astral is proud to present this years group 6 car, the T-0 Pantamera.


True to the Astral way, to save every precious kilo, there isn’t even a roof on this car, and everything is as basic as it can be.
To further aid lightness, the engine is only 3.4L, as it was decided that a flat torque curve, and lumpy big engine just didn’t make sense in this environment.
That being said, it is likley much less powerful then its competetors, making only 317hp. This however is still more then enough however to propel it up to a top speed of 170mph.
This years car numbers willl be:
94, 62 & 47, and all will sport the simplistic livery (with additional sponsors later).

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