GT Class

[tommeke_B]

Had a look at Snijers GT3 today. It's fitted with a 3.6 Cup engine, and I'm not sure if those can drive in FIA RGT? Still some changes to be made before first event of the season, nothing big. Really looking forward to see this car in action, especially because it's driven by the best possible GT driver in Belgium...

[CWJ]

Belgian GT and FIA RGT is two pair of shoes. You need at least work to the rollcage, the doors and the engine.

[tommeke_B]

Belgian GT and FIA RGT is two pair of shoes. You need at least work to the rollcage, the doors and the engine.

Rollcage is FIA homologated, doors are OK as well, for the engine we'll see... The car has never competed in Belgium yet and was built to German regulations.

[OldF]

I found this article about the Tuthill R-GT project.
http://www.exe-tc.co.uk/web/data/por...eng-nov-15.pdf

This article is from Racecar-engineering November 2014 issue.

Some highlights from the article.

“It weighted 1307 kg on the M-Sport’s scale before the rally (Germany), without driver and co-driver”

“The best weight/power ratio the team calculates it can achieve is 4,1 kg/bhp.”

“Until that Friday, when an e-mail announced that the restrictor size was to be 36 mm. Surprised, Moore ‘lathed’ one up in a Trier machine shop, fitted it to the engine, whose Bosch engine ECU crunched car weight and acceleration figures through its maths channel after the car was tested and came up with a fairly accurate estimate of 325 bhp (329,5 PS).”

To have the weight ratio of 3,4 kg/PS, the power should be 384 PS (379 bhp). In the video Chris Harris said that the restrictor size is 39 mm and power 350 hp (probably bhp). Calculating with the power of 329,5 PS with a 36 mm restrictor to a restrictor diameter of 39 mm, the power would be 387 PS (381 bhp). Which one is correct, 350 bhp or 379 bhp? Maybe with a NA engine the restrictor size is not that straight forward.

[Lundefaret]

Having a rear engined rear wheel drive car is actually an advantage, not a disadvantage, for a rally car.
With a rear wheel drive car with a surtain power output the challenge will quickly become how to get the rear tires gripping, transforming the force of the engine to force of movement in the car.
Having weight over the driven wheels is off cource important, either physical weight or theoretical weight (down force).
You do not want a heavy car, just to produce a high weight on the driven wheels, but You want a light car with a weight distribution over the driven wheels.

Porsche have made a mid engined rally car earlier, it was the Porsche 914/6. But it did not have the same grip as the 911, and had difficult handling. (It also made the 904)

Its the same story with front wheel drive cars. The SAAB V4 had a big advantage with the engine position in front of the front driven wheels, giving very good traction. This is why the SAAB could outpace much stronger rear wheel drive competition on loose surfaces.

We see the same now with Nissans mainly front wheel driven LM P1-car, designed by the brilliant Ben Bowlby.

The GT-class can become great in my opinion, tough I think that the FIA should allow larger restrictors.

[mousti]

Had a look at Snijers GT3 today. It's fitted with a 3.6 Cup engine, and I'm not sure if those can drive in FIA RGT? Still some changes to be made before first event of the season, nothing big. Really looking forward to see this car in action, especially because it's driven by the best possible GT driver in Belgium...

Probably around the same power than his previous Porsche of BMA also a 3.6 engine (http://www.bma-autosport.com/site/no...5-2303-fr.html) But according to the videos of German Rallies the Porsche has not the same sound like the one of BMA because different exhaust I think. Hope they change it, or already did

[tommeke_B]

The engine isn't the same as when Gengler was driving it...

[mousti]

Aha good ;p. Cant wait to see him on the stages at Haspengouw rally!

Verstuurd vanaf mijn Nexus 5 met Tapatalk

[cardy]

does the cayman GT4 qualify ?? http://www.topgear.com/uk/car-news/p...led-2015-02-03

[stefanvv]

does the cayman GT4 qualify ?? http://www.topgear.com/uk/car-news/p...led-2015-02-03

It seems so. Hopefully someone will take it and we'll see how better it could be than 997 GT3.