Ultima GTR V12
Discussion
alfasteve said:
Hi
I just want to use 18 Inch wheels the Porsche GT2 uses
18 Inch wheels too
GTRmannen said:
alfasteve said: Dear All
Its nice to see that there are more people interested in the V12 route.
an update on my progress :
i have 2 V 12 engines at the moment a 5.0 and 5.7 displacement engine , will use the bigger one
and a Motec M8 management system will control this all
with a Getrag 6 spd box with LSD
and the brakes from the Porsche 996 GT2 meaning
4 Brembo 6 pot callipers and 380 x 32 MM discs
will need to develop or find someone who allready did
develop a adaptorplate/Flywheel/Clutch/Exhaust sys
the engine will be at the builder around April where we hope to see 500 to 550 reliable normal asp Hp
Are you going to run 19" becouse 380mm dics will not fit 18"
No you are wrong
A standar Gt2 have not ap 350mm brakes,the brakes you are talking about is the long rece distance brake uppgrade that need 19" wheels..
Check with every body that know any thing about brakes that 380mm with 6 pot calipers not going to fit
Ok Thanks for the info, in that case i will have to go for 19 Inch
GTRmannen said:
alfasteve said:
Hi
I just want to use 18 Inch wheels the Porsche GT2 uses
18 Inch wheels too
GTRmannen said:
alfasteve said: Dear All
Its nice to see that there are more people interested in the V12 route.
an update on my progress :
i have 2 V 12 engines at the moment a 5.0 and 5.7 displacement engine , will use the bigger one
and a Motec M8 management system will control this all
with a Getrag 6 spd box with LSD
and the brakes from the Porsche 996 GT2 meaning
4 Brembo 6 pot callipers and 380 x 32 MM discs
will need to develop or find someone who allready did
develop a adaptorplate/Flywheel/Clutch/Exhaust sys
the engine will be at the builder around April where we hope to see 500 to 550 reliable normal asp Hp
Are you going to run 19" becouse 380mm dics will not fit 18"
No you are wrong
A standar Gt2 have not ap 350mm brakes,the brakes you are talking about is the long rece distance brake uppgrade that need 19" wheels..
Check with every body that know any thing about brakes that 380mm with 6 pot calipers not going to fit
alfasteve said:
Ok Thanks for the info, in that case i will have to go for 19 Inch
GTRmannen said:
alfasteve said:
Hi
I just want to use 18 Inch wheels the Porsche GT2 uses
18 Inch wheels too
GTRmannen said:
alfasteve said: Dear All
Its nice to see that there are more people interested in the V12 route.
an update on my progress :
i have 2 V 12 engines at the moment a 5.0 and 5.7 displacement engine , will use the bigger one
and a Motec M8 management system will control this all
with a Getrag 6 spd box with LSD
and the brakes from the Porsche 996 GT2 meaning
4 Brembo 6 pot callipers and 380 x 32 MM discs
will need to develop or find someone who allready did
develop a adaptorplate/Flywheel/Clutch/Exhaust sys
the engine will be at the builder around April where we hope to see 500 to 550 reliable normal asp Hp
Are you going to run 19" becouse 380mm dics will not fit 18"
No you are wrong
A standar Gt2 have not ap 350mm brakes,the brakes you are talking about is the long rece distance brake uppgrade that need 19" wheels..
Check with every body that know any thing about brakes that 380mm with 6 pot calipers not going to fit
Okey I think you are force to go another route,the ultima gtr will not take 19"
So the right way is to fit 182 with 350mm brakes and the 6 poters
If I remeber correctly, one of the owners was talking about running 19' or even 20' wheels on a Spider. Now he may have had to opt for a much narrower tyre to get the profile required to bring the overall diameter down. He was only looking at this for track use too, the profile would kill any ride quality. I mail him and ask if he has made any progress.
Paul
Paul
Hi All
The 18 Inch wheels will work as the Porsche GT 2 racing version also uses 18 inch wheels
you can check this out on this link where you can get
all tech data on the street versus race GT 2
www.autoweb.com.au/cms/news/newsarticle.html?&start=30&showall=&id=POR&doc=por9712241
The 18 Inch wheels will work as the Porsche GT 2 racing version also uses 18 inch wheels
you can check this out on this link where you can get
all tech data on the street versus race GT 2
www.autoweb.com.au/cms/news/newsarticle.html?&start=30&showall=&id=POR&doc=por9712241
Alfasteve,
It could be that the article is wrong. They're not always accurate. If it were me, I'd check with both AP racing and Brembo regarding the minimum inner wheel diameter needed for various calipers used with 380mm brakes. I don't know who made the calipers for the racing GT2. They're made by one of the two more than likely. I thought there were even rumors about Brembo purchasing AP racing at one time? I know Brembo used to make calipers for Porsche. My recolection was that 18" was limited to 355mm range. When I set out to investigate a custom brake solution, Brembo faxed me the specs on different calipers that shows a minimum diameter that there needs to be for the inside of the wheel. Wheels all measure differently, so you'll need to speak to your wheel manufacturer as well. How serious are you about wanting to have 380mm discs? Will this be a track only Ultima? These racing pads are a bee'atch on the street. They need to be heated up first. Do you plan to run monobloc calipers? I'd be happy to discuss these issues with you via email, and let you know about some of my experiences with fitting custom brakes. Not a cheap thing. Spent about $8k U.S. on a 328mm setup that uses floating discs and has racing calipers.
Cheers!
-Mack
Mack_Norris@yahoo.com
It could be that the article is wrong. They're not always accurate. If it were me, I'd check with both AP racing and Brembo regarding the minimum inner wheel diameter needed for various calipers used with 380mm brakes. I don't know who made the calipers for the racing GT2. They're made by one of the two more than likely. I thought there were even rumors about Brembo purchasing AP racing at one time? I know Brembo used to make calipers for Porsche. My recolection was that 18" was limited to 355mm range. When I set out to investigate a custom brake solution, Brembo faxed me the specs on different calipers that shows a minimum diameter that there needs to be for the inside of the wheel. Wheels all measure differently, so you'll need to speak to your wheel manufacturer as well. How serious are you about wanting to have 380mm discs? Will this be a track only Ultima? These racing pads are a bee'atch on the street. They need to be heated up first. Do you plan to run monobloc calipers? I'd be happy to discuss these issues with you via email, and let you know about some of my experiences with fitting custom brakes. Not a cheap thing. Spent about $8k U.S. on a 328mm setup that uses floating discs and has racing calipers.
Cheers!
-Mack
Mack_Norris@yahoo.com
Some info from my friend that maybe of interest ...........
The Spyder is now fitted with 18'' front and 19''rears.
What you need to do is work out the diameter of the tyres which fit already . width x aspect ratio x 2 + diameter of wheel.
A rear wheel for a GTR would be 18'' rim = 457.2mm
tyre width = 335mm aspect ratio 0.35 (335x35 ZR18)
Therefore diameter of tyre = 335x0.35x2+457.2= 691.7mm
So if you want a tyre on a 19'' rim = 482.6mm
or a 20'' rim = 508mm
Assuming the same width 335
335xaspectratiox2 +482.6=691.7
670xaspectratio=209.1
therefore you need a 0.31 or less aspect ratio to fit in the same diameter ie 335x30 ZR19
The sums are easy enough, then all you have to do is work out the offset, the distance from the wheel mounting flange to the outside of the wheel so the cars width remains the same.
Then ring up your friendly wheel manufacturer (Image?) specify the diameter (19''?) the offset, the rim width to fit the tyre (the tyre spec tells you this) and be careful to specify the minimum distance from the flange to the start of the wheel billet spokes so that they miss your brake calliper.
Good points on these wheels - the car looks well and grip is generally improved.
Bad points - it is easy to kerb or even damage the wheel in a pot hole, raised kerbs on race tracks can damage them. If the idea is to run the car on a track I would stick with the standard wheels. Also check carefully the availability of any tyre you are thinking of fitting as my experience is that many of these large diameter tyres are on long wait lists.
The Spyder is now fitted with 18'' front and 19''rears.
What you need to do is work out the diameter of the tyres which fit already . width x aspect ratio x 2 + diameter of wheel.
A rear wheel for a GTR would be 18'' rim = 457.2mm
tyre width = 335mm aspect ratio 0.35 (335x35 ZR18)
Therefore diameter of tyre = 335x0.35x2+457.2= 691.7mm
So if you want a tyre on a 19'' rim = 482.6mm
or a 20'' rim = 508mm
Assuming the same width 335
335xaspectratiox2 +482.6=691.7
670xaspectratio=209.1
therefore you need a 0.31 or less aspect ratio to fit in the same diameter ie 335x30 ZR19
The sums are easy enough, then all you have to do is work out the offset, the distance from the wheel mounting flange to the outside of the wheel so the cars width remains the same.
Then ring up your friendly wheel manufacturer (Image?) specify the diameter (19''?) the offset, the rim width to fit the tyre (the tyre spec tells you this) and be careful to specify the minimum distance from the flange to the start of the wheel billet spokes so that they miss your brake calliper.
Good points on these wheels - the car looks well and grip is generally improved.
Bad points - it is easy to kerb or even damage the wheel in a pot hole, raised kerbs on race tracks can damage them. If the idea is to run the car on a track I would stick with the standard wheels. Also check carefully the availability of any tyre you are thinking of fitting as my experience is that many of these large diameter tyres are on long wait lists.
Hi,
I am building a GTR in Germany and use Porsche brakes.
Front 350 x 34, rear 322 x 32, four piston monobloc calipers all around.
The brakes are from movit, [url]www.movit.de[/url]. They offer various Porsche brakes for nearly every car.
They had my wheels and my uprights and told me the 380 mmm discs will not fit.
It not only depends on the wheel`s inner diameter but also on the form of the upright.
To make my brakes fit it was necessary to replace the spacers in the wheels with sligtly wider ones.
It is possible but much more expensive to use the Porsche six piston calipers with the 350 mm discs.
Also think about the additional weight of the huge discs. It will not improve the car`s handling.
Michael
I am building a GTR in Germany and use Porsche brakes.
Front 350 x 34, rear 322 x 32, four piston monobloc calipers all around.
The brakes are from movit, [url]www.movit.de[/url]. They offer various Porsche brakes for nearly every car.
They had my wheels and my uprights and told me the 380 mmm discs will not fit.
It not only depends on the wheel`s inner diameter but also on the form of the upright.
To make my brakes fit it was necessary to replace the spacers in the wheels with sligtly wider ones.
It is possible but much more expensive to use the Porsche six piston calipers with the 350 mm discs.
Also think about the additional weight of the huge discs. It will not improve the car`s handling.
Michael
Thanks all for the good advise
i will see wether i will need to change the wheel from 18 to 19
and will decide from there where to go
first i will measure the inside diameter the wheel must have and maybe one of you can measure the inside diam of the wheel
i also thinking about using the porsche stud it has
5 x 130 mm
i will see wether i will need to change the wheel from 18 to 19
and will decide from there where to go
first i will measure the inside diameter the wheel must have and maybe one of you can measure the inside diam of the wheel
i also thinking about using the porsche stud it has
5 x 130 mm
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