Sports Sedan Forum

Hi all, I was wondering...why do the "floorplan chasis" rules exist? How many 4wd sports sedans have raced across Aus since they were implemented, how many cars have been built/logbooked, and why are the rules so restrictive compared to the traditional ss.

If you guys genuinely want more entrants, why not allow these cars to be competitive? clearly front running sport sedans are a one make cateogy (chev 6l), and that maker just went broke :thinking:

I think you could make a 4wd car quiet fast.

Min weight is: 3.5L multivalve turbo, 1125kg+50kg(4wd)+75kg(multivalve)=1250kg so a bit heavy but the same weight as a trans am car. Or an rb 26 would be 1175kg.

If you made some fabricated suspension arms and uprights and really stiffen the thing up with a decent roll cage, you have plenty of weight up your sleeve. you could also then get your 50/50 weight balance.

Duncan what does a race skyline weigh?

Sorry for my terrible math, min weight for an rb26 4wd is 1100kg, lighter then a 6 litre.

Well mine is a 3E/production car so about 1550, and 250kw. not exactly quick, every car cruising down george st can go faster than it....which is why I'm interested in giving 3D a go instead. But the for an open category the rules are very restrictive.

I think I can get it to the minimum weight OK, but the motor and box are heavy, and the fwd, transfer case, 4wd pumps etc add up to a fair bit.

Re minimum weight, I calculated: (2.6l x 1.7 = 4.4l) 975kg + multivalve 75kg + 4wd 50kg = 1100kg.

But the restrictions to floorpan modifications, and having to retain the factory block are real restrictions. Can't run move the engine back (assuming the firewall is part of the floorpan and therefore can't be changed) which is a shame because it's tall and heavy. Also having to retain the factory drivetrain just makes it expensive trying to put big power through standard bits.

Anyway...thats why I was interested if anyone has actually had a serious go at building a car to these regs. I know 2x log booked ones and 2 including mine that are underway but not logged yet

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Hi all, I was wondering...why do the "floorplan chasis" rules exist? How many 4wd sports sedans have raced across Aus since they were implemented, how many cars have been built/logbooked, and why are the rules so restrictive compared to the traditional ss.

If you guys genuinely want more entrants, why not allow these cars to be competitive?
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The theory of allowing 4WD chassis cars to race will make all other SS's redundant. I do not see the point in that if we all have to go out and turnour cars into 4WD to compete. Easy answer is build a 2wd car like everyone else. If you can't build a 2wd car then you will not build a 4wd car so I fail to see your point. 4wd is for rallying and off road, leave genuine racing to 2wd.

The rules were relaxed to allow 4wd floorplan cars and none turn up anyway. Case closed, lets move on.

Here here, well said Phil.

Thanks for the honest and frank responses guys, that very much answers my question. bottom line is you guys don't want better/faster cars running against you so you hobble them, just like irpa did with turbo restrictors. Its a bit sad but I understand you want to protect the existing 9 cars that finish in the national rounds.

All the best with what is left of your category.

Thanks for the honest and frank responses guys, that very much answers my question. bottom line is you guys don't want better/faster cars running against you so you hobble them, just like irpa did with turbo restrictors. Its a bit sad but I understand you want to protect the existing 9 cars that finish in the national rounds.

And a warm welcome to the forum!!! Nice sledge!!

You're wrong about the bottom line. The bottom line is that there is an existing set of rules there for you to work with. You choose not to, spit the dummy and take aim at our category which is a little unfair. If you were good enough and had enough coin to do so, I'm sure you could build a 4WD Floorpan car that would mix it with the quick Sports Sedans. I guess that's the big question, are you clever enough to make one go, and do you have enough coin?

If I'm not mistaken, Lofty's version that has competed in the NSW State Championship is very quick, so clearly it can be done if you could be bothered going to the same amount of effort that he has. It would seem from the tone of your post that you're not prepared to put that same amount of effort in. That is a shame.

All the best with what is left of your category.

Cheers, thanks for the well wishes. Enjoy flogging your rocket around Industrial Estates at 1am.

Everyone has to run a factory block in Sport Sedans regardless of 2wd or 4wd.

The whole point of limiting a 4WD car to running the floorpan construction and factory block/head was to prevent someone building a monster 4WD car (think Rod Millen Pikes Peak style Toyota Celica but for a track) that undoubtably would make all existing cars that have kept the category alive over the years redundent! A fair point I feel.

In no part of the rule book does it say that you have to run the factory driveline parts either i.e gearbox, diff, axles, etc these items are all free. As far as floor pans go there is still some scope for modifcation and belive it or not floor pan cars can still cut it, just look at the pace of some GT3 and GT2 race cars!

As for better faster cars.... very easy to say a lot harder to actually do!

If I'm not mistaken, Lofty's version that has competed in the NSW State Championship is very quick, so clearly it can be done if you could be bothered going to the same amount of effort that he has.

You are correct FalconEL, loftys skyline is quite a quick car, and dont forget its been restricted to ipra regs so it hasnt reached its full potential, once you get some big fats under the guards and wind the boost on that thing it should be quite quick...