GT3 Manufacturers...

[Bcarr6]

Bentley have confirmed a new GT3 model for 2018. So likely to be a test and or test race campaign late in 2017 ahead of open sales for 2018.

Will be a new Continental GT, however styling cues couldn't be used from the EXP 10 Speed 6 concept car


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[TF110]

Originally Posted by Japanese Samurai

According to Kota Sera blog,
next issue of Motor Fan Illustrated magazine will feature Lexus RC F GT3 MY17.
http://serakota.blog.so-net.ne.jp/2017-01-11

Interesting, will you be purchasing it? Hopefully they go into the development of the car because I think TMG and TRD Japan both had a hand in the new model.

[Japanese Samurai]

If there is interesting info, I'll buy it.

[TF110]

Originally Posted by Japanese Samurai

If there is interesting info, I'll buy it.

Sounds good! I wish it were up for purchase in my region.

[Japanese Samurai]

According to Yosuke Fukuda (Engineer of Team Gainer),
Lexus RC F GT3 MY17 introduces in-board suspension in front and rear.
https://twitter.com/yosuke_fukuda/st...60008145473536

[Japanese Samurai]

Is the change of the suspension style legal?

[Japanese Samurai]

Here is MFi magazine preview
http://www.as-books.jp/books/preview.php?no=4742

Engine room shot of RC F GT3. You can check out the in-board suspension.

[Japanese Samurai]

MFi magazine reports RC F GT3 MY17.

**MY17 Specs
L: 4,846 mm/W: 2,030 mm/H: ???? mm
Wheelbase: 2,770 mm
Minimum weight: 1,300 kg
Engine: 2UR-GSE V8 NA Direct injection
Displacement: 5.4 l
Bore/Stroke: 95.4 mm/94.5 mm
Max output: more than 368 kW (500 ps)
Throttle: each cylinder individual
VVT: intake side only
Cylinder block: Closed deck
Engine oil lubrication: dry sump
Clank shaft: Crossplane
Transmission: 6 speed sequential (transaxle)
Steering assistance: Electric/Column assist
Suspension: in-board pushrod
Tire: 330/710.18, 330/710.18

*Real weight of MY15 was 1,340 kg. Target weight of MY17 was 1,280 kg.
*At first, they tried singleplane crankshaft. But vibration trouble has occurred.
So they returned to crossplane.
*MY15 was Port injection with Direct Injection. However, MY15 adopts DI only.
*Front grille and headlight unit are mass-production parts.
*Shift paddle is mass-production parts.
*Annual engine mileage is 15,000 km. Maintenance mileage is 10,000 km.

[Japanese Samurai]

Supplement
*To improve the maintenance performance, bonnet and fender unite.
*6 speed horizontal gearbox is made by X-trac.

[Japanese Samurai]

According to MFi magazine,
Detailed technical regulations doesn't exist in FIA-GT3.
There is a GT3 guideline by GT committee (only 5 pages).
Therefore GT3 constructor submits technical proposal to GT committee and requests the ruling.

[Japanese Samurai]

There are 3 criterias to make competitive power balance in FIA-GT3.
It's requested that the performance of 3 following is in the standard value.
Performance window 1 (Acceleration performance): x: Average output/y: Car weight (60 km/h to 250 km/h)
Performance window 2 (Maximum speed performance): x: Max output/y: Drag (in 250 km/h)
Performance window 3 (Aerodynamics performance): x: Downforce/y: Aerodynamics efficiency (in 250 km/h)

[Japanese Samurai]

Originally Posted by Japanese Samurai

According to MFi magazine,
Detailed technical regulations doesn't exist in FIA-GT3.
There is a GT3 guideline by GT committee (only 5 pages).
Therefore GT3 constructor submits technical proposal to GT committee and requests the ruling.

Strictly speaking, there is a technical regulations of FIA-GT3.
However, that didn't make the modifying possible area clear.
So GT3 guidelines (5 pages) substitutes it.

[TF110]

Thanks for the info! Anything further on the inboard suspension setup, Samurai?

[Japanese Samurai]

Lexus RC F GT3 video.
You can check out the engine room with no upper mounts of suspension.
https://youtu.be/2cPt-K-eY6I?t=79

[StueyB83]

The set-out of suspension arrangement is free. The Lexus is not the first FIA homologated car to significantly alter its suspension geometry: the Reiter Camaro for instance, has inboard suspension front (mounted to the chassis rails) and rear (within a new rear subframe) that isn't connected to the stock turrets.





The BMW M6 GT3 also doesn't retain the original front turrets to mount the suspension - it has a GT3 specific upper sub frame which ties back to the fire wall. It is part of a design that allows the entire front section of the car to break away for maintenance (the chassis rails forward of the firewall actually have a joint in them for this purpose):

[TF110]

Interesting, and a very nice first post!

[Mitchi_S]

Originally Posted by StueyB83

Wow. Production based race cars, huh?

[Akrapovic]

Well, GT3s have never really been production based. That's why they're so popular. They are essentially mini prototypes, that have to look like a road car, but that's about it. Most of the GT3 cars wouldn't be possible if they had to be road car based. The Bentley for example, the entire front end is scaled up to keep the proportions of the nose the same, so they didn't have to add big vulgar arches to the shape - they just widened the whole thing.

It's a great concept, but does require BoP to actually work, since everything is just performance boxes. That's why SRO has tried to keep factory entries out.

[canaglia]

Originally Posted by Akrapovic

Well, GT3s have never really been production based. That's why they're so popular. They are essentially mini prototypes, that have to look like a road car, but that's about it. Most of the GT3 cars wouldn't be possible if they had to be road car based. The Bentley for example, the entire front end is scaled up to keep the proportions of the nose the same, so they didn't have to add big vulgar arches to the shape - they just widened the whole thing.

It's a great concept, but does require BoP to actually work, since everything is just performance boxes. That's why SRO has tried to keep factory entries out.

old GT1 days, nissan gt-r too had "detachable" front sub-frame... at the end it's all about how many waivers a manufacturer is able to get.
2016 C7R use a tubular custom chassis

[carbsmith]

That's a tired old argument I haven't seen in a while. All of the Corvette race cars retain the stock frame, there just isn't much stock frame to start with compared to most other cars.


The rear hoop and windshield frame are reattached after the roll cage is put in, since those are modular pieces for different production body styles.

[FIRE]

About the Lamborghini Huracán: In two years time there are 60 GT3 cars and 141 Super Trofeo cars built. Source: www.autosport.nl

[Mitchi_S]

Originally Posted by Akrapovic

Well, GT3s have never really been production based. That's why they're so popular. They are essentially mini prototypes, that have to look like a road car, but that's about it. Most of the GT3 cars wouldn't be possible if they had to be road car based. The Bentley for example, the entire front end is scaled up to keep the proportions of the nose the same, so they didn't have to add big vulgar arches to the shape - they just widened the whole thing.

It's a great concept, but does require BoP to actually work, since everything is just performance boxes. That's why SRO has tried to keep factory entries out.

Oh I understand, don't worry. I was more joking at how far GT3 has become still astounds me when I look back at Viper CC's and 997 GT3 cup cars. So humble.

[Bcarr6]

The Nismo press release this morning states a new GT-R GT3 planned for 2018, with Masataka Yanagida and Michael Krumm outlined as development drivers with tests in both Japan and Europe


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[TF110]

Originally Posted by Bcarr6

The Nismo press release this morning states a new GT-R GT3 planned for 2018, with Masataka Yanagida and Michael Krumm outlined as development drivers with tests in both Japan and Europe


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As long as it's still based on the current R35, it'll be a big car. The next GTR needs to be smaller.

[Matt]

No it doesn't. The big GT3 cars are the most fun to watch.