Weakest point?
Discussion
The only disadvantage that I know of is the lack of storage space. In the GTR, you have some space in the side pods, but that isn't much.
I don't think it really needs to be addressed by anybody, as it isn't designed as a super practical shopping car anyway. If you do need additional storage space, there's a simple solution. Leave your passenger at home. That way, you get to use both side pods for your own stuff, and you can also store things on the passenger seat and footwell
James
I don't think it really needs to be addressed by anybody, as it isn't designed as a super practical shopping car anyway. If you do need additional storage space, there's a simple solution. Leave your passenger at home. That way, you get to use both side pods for your own stuff, and you can also store things on the passenger seat and footwell
James
What is the main disadvantage of current Ultima GTR?
What would you like to change in your car?
Or, what would you like to be changed by manufacturer?
Are you thinking of building a GTR / Can-Am, if so don't worry there fantasic as standard. Only thing I would change ........ the cigaret lighter.
Yes,
I’m about to finish one project and looking for the next car.
As I found out reading builders diaries, there are two problems with Ultima GTR.
Chassis stiffness and cooling.
So I asked to something more to be ready to solve.
Actually my previous project was not about chassis but about the engine.
I built Toyota Supra TT with 900rwhp
I’m not familiar with carburetors and American iron at all.
I’m about to finish one project and looking for the next car.
As I found out reading builders diaries, there are two problems with Ultima GTR.
Chassis stiffness and cooling.
So I asked to something more to be ready to solve.
Actually my previous project was not about chassis but about the engine.
I built Toyota Supra TT with 900rwhp
I’m not familiar with carburetors and American iron at all.
Igor+ said: Yes,
I’m about to finish one project and looking for the next car.
As I found out reading builders diaries, there are two problems with Ultima GTR.
Chassis stiffness and cooling.
So I asked to something more to be ready to solve.
Actually my previous project was not about chassis but about the engine.
I built Toyota Supra TT with 900rwhp
I’m not familiar with carburetors and American iron at all.
This is not a pop mate ...... but where has the "chassis stiffness" problem been highlighted?
www.ultimav12.ca/chassis/index.html
Lotus Elise :8000
Porsche 911 :10,000
Mclearn F1 :25,000
Mazda Miata :3800
Porsche 906 :1700
Porsche 904 :1500
Mclearn M6B :6000
Ultima GTR: 3300
Lotus Elise :8000
Porsche 911 :10,000
Mclearn F1 :25,000
Mazda Miata :3800
Porsche 906 :1700
Porsche 904 :1500
Mclearn M6B :6000
Ultima GTR: 3300
1) I would change the angle present on the drive-shafts as they are a bit steep for my liking. If you have a dry sump (), you can shave a sizeable amount off the engine mounts and the drop the engine to allow the drive shafts to leave the trans-axle at right angles - as they should. You would also have to do some mods to the exhaust and re fabricate the gearbox support chassis rail, but it would also lower the center of gravity so would be worthwhile. See Jay Esterer for details.
2) I would change the fuelling arrangement, by getting rid of the independent tank setup, with individual pumps and switches, to having both tanks joined with a large diameter (#12) balance pipe.
Then I would uprate the fuel tank fittings and lines to #8's then there would be no need to change them if you decided to drop in a 1000hp motor!
3) And finally the same with the oil - #12 for a faster flow of oil, and lose some temperature.
Other than that I find no faults, and they are not faults as such, just improvements I would make to accomodate any engines.
), you can shave a sizeable amount off the engine mounts and the drop the engine to allow the drive shafts to leave the trans-axle at right angles - as they should. You would also have to do some mods to the exhaust and re fabricate the gearbox support chassis rail, but it would also lower the center of gravity so would be worthwhile. See Jay Esterer for details. 2) I would change the fuelling arrangement, by getting rid of the independent tank setup, with individual pumps and switches, to having both tanks joined with a large diameter (#12) balance pipe.
Then I would uprate the fuel tank fittings and lines to #8's then there would be no need to change them if you decided to drop in a 1000hp motor!
3) And finally the same with the oil - #12 for a faster flow of oil, and lose some temperature.
Other than that I find no faults, and they are not faults as such, just improvements I would make to accomodate any engines.
Igor+ said: www.ultimav12.ca/chassis/index.html
Lotus Elise :8000
Porsche 911 :10,000
Mclearn F1 :25,000
Mazda Miata :3800
Porsche 906 :1700
Porsche 904 :1500
Mclearn M6B :6000
Ultima GTR: 3300
You need to take that in context. It's comparing apples with pears. The chassis stiffness was measured with the completely bare chasis in that test. If you look further down the build diary, you'll see that the panelling of the chasis improved the stiffness substantially.
The figures for the other cars was the stiffness of the FINISHED car.
The chasis of the Ultima is designed to be as stiff as it needs to be. It was designed with a maximum engine power of 1,000BHP in mind. If you want to go over that, or if you want a particularly stiff chasis for some reason, then you may want to stiffen it.
It isn't a problem though.
Cooling is also not a problem, if you're fitting a factory standard spec engine. You just need to make sure that you put it all together properly.
However, if you put in a more powerful engine, you'll need to uprate the cooling. The trick is to know exactly what you need to do. That's where this forum comes in useful.
James
Dear James!
I’m just collecting different opinions of Ultima owners.
I can’t be positive in chassis stiffness discussion.
As I mentioned above all my knowledge is not about chassis but about engine tuning.
I just found that one of the builders doesn’t like Ultima chassis stiffness.
I will use alloy honeycombs paneling on my own Ultima.
Cheap and very strong.
Nothing against you and Ultima car.
I will be one of you on October.
I’m just collecting different opinions of Ultima owners.
I can’t be positive in chassis stiffness discussion.
As I mentioned above all my knowledge is not about chassis but about engine tuning.
I just found that one of the builders doesn’t like Ultima chassis stiffness.
I will use alloy honeycombs paneling on my own Ultima.
Cheap and very strong.
Nothing against you and Ultima car.
I will be one of you on October.
Igor,
I think you got the wrong impression. I wasn't suggesting that you were jumping to conclusions, just that the site you had referred to was not actually picking up on a deficiency in the Ultima. I believe his idea was to build a car as close in spec to a McLaren F1. Therefore, he needed to increase the stiffness of the chasis in order to match that car.
It's all too common in a forum like this for myths to become self-perpetuating, and something which isn't a problem suddenly becomes seen as one.
The ally honeycomb thing sounds like a good idea. I mentioned it myself on a different thread recently. Not sure if it was in answer to your post or not.
James
I think you got the wrong impression. I wasn't suggesting that you were jumping to conclusions, just that the site you had referred to was not actually picking up on a deficiency in the Ultima. I believe his idea was to build a car as close in spec to a McLaren F1. Therefore, he needed to increase the stiffness of the chasis in order to match that car.
It's all too common in a forum like this for myths to become self-perpetuating, and something which isn't a problem suddenly becomes seen as one.
The ally honeycomb thing sounds like a good idea. I mentioned it myself on a different thread recently. Not sure if it was in answer to your post or not.
James
This panel skinning is confusing me.
I am an engineer but not structural so may be missing some vital point.
I will try to explain how I think the Ali skins work.
If I took a table with four legs that had rather poor joints it would be weak and unstable. If I skinned opposite faces of the legs it would become strong and stable in line with the skins but still weak in the other plane.
If I turned the table over the skin would not do a very good job of preventing me pushing and pulling the legs in opposite directions i.e. twisting the skin.
If I now return to the car and consider a floor skin. It will prevent the chassis from bending side to side in a horizontal plane but will not do much to prevent it twisting.
A side skin will prevent the chassis bending up and down but again will have a marginal effect on the twist.
As I see it the primary functions preventing twist are the front and rear bulkheads along with any other diagonal braces such as the under dash frames, rad. mount frame, gearbox frames etc.
I would think the honeycomb would improve the performance of the skins but not carbon skins alone.
Tell me where I’m going wrong.
Steve
I am an engineer but not structural so may be missing some vital point.
I will try to explain how I think the Ali skins work.
If I took a table with four legs that had rather poor joints it would be weak and unstable. If I skinned opposite faces of the legs it would become strong and stable in line with the skins but still weak in the other plane.
If I turned the table over the skin would not do a very good job of preventing me pushing and pulling the legs in opposite directions i.e. twisting the skin.
If I now return to the car and consider a floor skin. It will prevent the chassis from bending side to side in a horizontal plane but will not do much to prevent it twisting.
A side skin will prevent the chassis bending up and down but again will have a marginal effect on the twist.
As I see it the primary functions preventing twist are the front and rear bulkheads along with any other diagonal braces such as the under dash frames, rad. mount frame, gearbox frames etc.
I would think the honeycomb would improve the performance of the skins but not carbon skins alone.
Tell me where I’m going wrong.
Steve
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