Whys that? …not going much bigger. [/quote]
Because you are changing the roll centre of the car for the worse… [/quote]
I thought Sean was refering to the move to 17/18, not the extra width. Besides, Im not sure how uprights effect it…its more the wishbone length and/or strange offsets is it not?
Before I get any sort of flaming…Im no expert in this, just looking to learn 
That shouldnt be an issue with the ride heights im looking at though…maybe if I was running 100/110 like the 2-11 it would pose a problem.
When you put 245/40/17 wheels & tyres on the front of my car and 315/30/18 on the rear, the ride goes to roughly 160/160.
To get the ride hight down to 110/115 I would end up with fairly extreme wishbone angles.
If we fit Eliseparts GT Race uprights they drop the car 40mm all round giving me a 120/120 ride hight with the same wishbone angles as they were meant from factory.
We then just need to make a slight adjustment and minimal wishbone angle change to get to 110/115.
If I were you and didn’t want to spend money on uprights, I would keep the 16 inch front wheels and 17 inch rears
Whys that? …not going much bigger. [/quote]
Because you are changing the roll centre of the car for the worse… [/quote]
I thought Sean was refering to the move to 17/18, not the extra width. Besides, Im not sure how uprights effect it…its more the wishbone length and/or strange offsets is it not?
Before I get any sort of flaming…Im no expert in this, just looking to learn [/quote]
Taller wheel (17/18) = more extreme (in a bad way) wishbone angle for the same ride height - nothing to do with wheel width.
The thing has to handle well as well as look good…
This is why I abandoned the wide body idea before I even started to go down that road… There is a lot more to it than having a set of clams that fit…
The more I looked into it the more headaches I could ultimately see. There is just far too much to get right and keep the car all in balance and good geometry on the suspension components.
I personally think that all you’ll be doing is chasing your tails trying to get it to work properly in a never ending flow of cash going out, but i’m more than willing to be proved wrong…
My biggest concern about it all would be the mounting of the rear uprights. Ive seen the bolts that hold it to the wishbone fail running 8" rims…
[quote=frank]I have the suspension of the GT3, more grip, twice the power and 500 lbs less weight…
[/quote]
You have the GT3 wishbones / uprights and longer driveshafts Frank ?
The earlier GT3’s used a 3-way 36mm ohlins running on springs approx 900f/1000r
The later cars were on ttx40’s
I still got why the 17/18 combo will affect the wishbone angles when the rolling radius is close the oem by goign lower on the tyre profile…or am i missing something?
The idea of this thread was to find the best compromise for handling and looks. Still happy to go with 16/17 if that proves better.
Still thinking about longer wishbones from Pilbeam racing. Certainly cheraper than braids
[quote=moomin][quote=frank]I have the suspension of the GT3, more grip, twice the power and 500 lbs less weight…
[/quote]
You have the GT3 wishbones / uprights and longer driveshafts Frank ? [/quote]
I thought he had hoffman spec Nitrons.
Decide on the tyres you want to go with then look at what sizes are available in what diameters and go from there…
[quote=Greg_]When you put 245/40/17 wheels & tyres on the front of my car and 315/30/18 on the rear, the ride goes to roughly 160/160.
To get the ride hight down to 110/115 I would end up with fairly extreme wishbone angles.
If we fit Eliseparts GT Race uprights they drop the car 40mm all round giving me a 120/120 ride hight with the same wishbone angles as they were meant from factory.
We then just need to make a slight adjustment and minimal wishbone angle change to get to 110/115. [/quote]
Thats because the rolling radius is way out on the front…your adding 32mm with the tyre profile which with the std elise ride height of 130mm would give you a new height of 160ish with the wheels on. Really you need 245/30/17 on the front.
[quote=TarmacTerrorist]TMy biggest concern about it all would be the mounting of the rear uprights. Ive seen the bolts that hold it to the wishbone fail running 8" rims…
[/quote]
Actually thats a concern of mine too…plenty of vx220’s have snapped hub carrier bolts on std Bridgestone tyres.
[quote=N17VES][quote=Greg_]When you put 245/40/17 wheels & tyres on the front of my car and 315/30/18 on the rear, the ride goes to roughly 160/160.
To get the ride hight down to 110/115 I would end up with fairly extreme wishbone angles.
If we fit Eliseparts GT Race uprights they drop the car 40mm all round giving me a 120/120 ride hight with the same wishbone angles as they were meant from factory.
We then just need to make a slight adjustment and minimal wishbone angle change to get to 110/115. [/quote]
Thats because the rolling radius is way out on the front…your adding 32mm with the tyre profile which with the std elise ride height of 130mm would give you a new height of 160ish with the wheels on. Really you need 245/30/17 on the front. [/quote]
Front: From 598-627 (29mm extra diameter, 14.5mm extra ride hight)
Rear: From 634-648 (14mm extra diameter, 7mm extra ride hight)
We measured the ride hight the other day with the new rear wheels on and it was 160 somehow.
[quote=N17VES][quote=TarmacTerrorist]TMy biggest concern about it all would be the mounting of the rear uprights. Ive seen the bolts that hold it to the wishbone fail running 8" rims…
[/quote]
Actually thats a concern of mine too…plenty of vx220’s have snapped hub carrier bolts on std Bridgestone tyres. [/quote]
This happened to me!
I had to replace with some special high tensile bolts
[quote=N17VES][quote=TarmacTerrorist]TMy biggest concern about it all would be the mounting of the rear uprights. Ive seen the bolts that hold it to the wishbone fail running 8" rims…
[/quote]
Actually thats a concern of mine too…plenty of vx220’s have snapped hub carrier bolts on std Bridgestone tyres. [/quote]
You only have to look at the revisions they have made to the rear end of the new v6. They have pretty much beefed up everything to carry the extra weight and extra loading from the bigger wheels, brakes and the increase in power.
I just think youll be asking a lot from an original design that was based on 120hp and a 7" wheel.
Other than the GT3’s the only other elise based chassis the factory have sold with slicks on were the 2-11 GT4 supersports and they made new lower rear wishbones for them which are stronger even though they were still only using the std 8"rear.
The fact is I dont think the factory ever got the GT3’s to work that well and the wide body car didnt really do more than 3-4 races that last year under the factory supervision, anything you see running these day is a home build and refined.
[quote=Chalkey][quote=N17VES][quote=TarmacTerrorist]TMy biggest concern about it all would be the mounting of the rear uprights. Ive seen the bolts that hold it to the wishbone fail running 8" rims…
[/quote]
Actually thats a concern of mine too…plenty of vx220’s have snapped hub carrier bolts on std Bridgestone tyres. [/quote]
This happened to me!
I had to replace with some special high tensile bolts
[/quote]
Even with the uprated bolts they have been known to fail, it something I change on a very regular basis as it costs pennys.
Is that how the car ended up? on the path like that?
God help you if you were ever to kill someone on the foot path because you’ve took it upon yourself to re-invent the wheel…
Jeez ! Is this a fault with standard VXs or is this from messing ?
all suffer from it.
I did not have a say in where the car ended up! 50mph and the back stepped out. What really shook me up was that if it happened 5 minutes later i would have been on the motorway no doubt in the outside lane and i’d dread to think what the outcome could have been