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13 Jan 2006, 03:20 (Ref:1500317)
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#1 | |
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Rookie
Join Date: Jan 2006
Posts: 2
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Newbie Question...
Hello, all.
I hate to ask what I'm sure all of you will think is a stupid question, but I've searched everywhere and can't find a satisfactory answer. Probably doesn't help that I've just "discovered" GT racing and don't know where to go for good info yet. My question: what, exactly, is the difference between the GT1 and GT2 classes? I've looked at the FIA and ACO regulations...and the weights, size, and engine displacement all seem the same. I know there is a difference in the air restrictors...but couldn't make heads or tails of the table at the end of the ACO regs. If anybody could enlighten me, I'd greatly appreciate it. |
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13 Jan 2006, 08:16 (Ref:1500362)
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#2 | ||
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Veteran
Join Date: Aug 1999
Posts: 2,530
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Welcome to Ten-Tenths Doogs.
 I can't give you a decent answer to your question, someone better qualified will be along shortly.... You are not alone in being confused by the GT class structures, especially as they seem to be renamed every year. |
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__________________
"Not the pronoun but a player with the unlikely name of Who is on first."
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13 Jan 2006, 08:34 (Ref:1500365)
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#3 | ||
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Rookie
Join Date: Mar 2004
Posts: 40
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Good luck whoever can explain the difference. Whoever does it I congradulate you.
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13 Jan 2006, 09:56 (Ref:1500394)
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#4 | ||
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Veteran
Join Date: Dec 2004
Posts: 2,555
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I think the basic way of putting it is that GT1 includes the bigger, more exotic cars which are faster and more of a rarity, whilst GT2 includes cheaper cars which are produced in larger numbers. The rule books go much, much deeper than that, though.
Doesn't engine size have something to do with it? Cars like Porsche 996 and Ferrari 360 in GT2 having somewhere roughly around 4 litres, whilst cars in GT1 have varied from roughly 6 litres in the 550's, 7 litres in the Saleens, and even 8 litres for the Vipers. Also is there anywhere stated about the layout of the engine? For example, you generally don't see any V10's and V12's in GT2, and at the same time you don't see any straight 6's in GT1... I'd also hazard a guess at BHP figures having a big say in things too... |
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13 Jan 2006, 10:07 (Ref:1500400)
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#5 | |
 Race OfficialVeteran
Join Date: Jan 2005
Posts: 6,103
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I'm no better qualified than Truckosaurus but I'll put my neck on the line (again!
 )...........GT1's are allowed an enhanced aero package over their road going cousins. In particular the large rear wing which is permitted. They are also allowed carbon discs, GT2 must be of a 'ferrous' material. The fuel restrictor sizes will of course differ which gives the GT1's an additional power advantage. There are, of course, many other differences in the regs between the two classes, but I reckon the three I've mentioned above make up the majority of the performance advantage GT1's gain over GT2's. So GT1's have more power, more downforce and better brakes. If I tried to go into any more detail I'd be way out of my depth..........
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13 Jan 2006, 10:24 (Ref:1500409)
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#6 | ||
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Veteran
Join Date: Mar 2005
Posts: 1,626
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Maybe reading here (next to the good info you already received) will give you all the in-depth detail
http://www.lemans.org/sport/sport/re...4hauto_gb.html |
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13 Jan 2006, 13:16 (Ref:1500476)
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#7 | ||
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Race Official Veteran
Join Date: Jan 2005
Posts: 6,103
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Quote:
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13 Jan 2006, 15:05 (Ref:1500541)
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#8 | |
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Veteran
Join Date: Jan 2004
Posts: 932
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GT2 is for cars whose street versions can compete with the Porsche, GT1 is for the cars whose street versions can't.
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13 Jan 2006, 15:20 (Ref:1500547)
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#9 | |
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Rookie
Join Date: Jan 2006
Posts: 2
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Everyone...thank you very much. I feel I at least have a grasp of it now...
One more question...can anyone explain the air restrictor charts near the end of the ACO regulations? ACO GT2 Regs I've been staring at them for some time...but there isn't exactly a lot in the way of explanation to go along with them. |
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13 Jan 2006, 16:06 (Ref:1500575)
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#10 | |
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Racer
Join Date: Apr 2003
Posts: 327
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maybe a bit too basically, but with GT1, there are more modifications allowed overall than there are in GT2. GT1 is closer to a full out prototype, whereas GT2 is a bit closer to a roadcar. typically in GT1 you see the bigger, more "exotic", or "rare", or "expensive" (not always though) supercars, whereas in GT2 you see the supercars and sportscars that are normally found in higher production numbers, like the 911...
take the different Ferrari's for example, GT1= F550, GT2= F430. you could also theoretically build a GT1 and GT2 version out of the same car (and has been actually, corvette and 550 for example). the GT1 version would (should) be inherently fast because there are more modifications allowed (bodywork, aero, engine, etc.) to bring it farther from "road car" to race car"... hope this helps, and WELCOME WELCOME WELCOME to the sport!!! pit |
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13 Jan 2006, 16:19 (Ref:1500579)
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#11 | ||
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Race Official Veteran
Join Date: Jan 2005
Posts: 6,103
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Quote:
The ACO boffins aim is to attain (theoretical) equality of power for all competitors in a given class. In order to allow variety of engine choice and power equivalency between competitors, the charts give the permitted air restrictor size which will be applied to an engine given it's capacity and induction. In GT2, minimum overall (car) weights are variable. Therefore, a more complicated chart is used which allows not only for engine type and capacity, but also the overall weight at which the car will compete (ie heavier car with same capacity engine as a lighter car will be allowed a larger restrictor to compensate for it's additional weight). Hope that helps......... |
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13 Jan 2006, 22:19 (Ref:1500853)
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#12 | ||
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Veteran
Join Date: Dec 2004
Posts: 2,555
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I think (but am by no means certain) GT2's can also go longer on fuel which is supposed to even things out a little bit (but never works) - am I right in thinking GT1's can go around 50 mins or so on a single tank, whilst GT2's can go 80-90 mins....?
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13 Jan 2006, 22:47 (Ref:1500878)
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#13 | ||
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Racer
Join Date: Dec 2002
Posts: 242
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In my opinion about the difference from GT1 and GT2 is their speed and power, other than that, not much is different from GT1 and GT2. GT2 is supposed to be based more on street going sports cars that have little conversion to race. GT1 is heavily modified sports cars that are allowed more power and upgrades from the street going versions. I think in the future that GT1 will become the "exotic" class of sport gt racers due to fact of Ferrari creating an exotic car codenamed the "F60" to replace the Enzo and Porsche racing the Carrera GT or any new gt exotic they create. Then, GT2 will become the old GT1 racers. That?s just my opinion.
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15 Jan 2006, 20:30 (Ref:1501867)
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#14 | ||
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Veteran
Join Date: Aug 1999
Posts: 2,530
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In the latest (2005) Le Mans yearbook, the authors list the GT2 regs simply "as GT1 but without carbon brakes".
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__________________
"Not the pronoun but a player with the unlikely name of Who is on first."
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