22 replies to this topic

[SteveA]

225 fronts, 255 Rears

[Mike (Cliffie)]

You will have forearms like a gorilla pretty soon Steve.

[SteveA]

The fronts are sharp as a razor. The 225 Federal RS-R's are in a different league to 195 A048's.

[FLD]

What did you need to do to squeeze them in?

[SteveA]

Fronts needed a cavity cutting out of the sill inside the wheel arch to allow them to full lock without rubbing and the rears went straight on. I think the rears might catch the mud guards on heavy G cornering but I think a bit of dremmel action should sort it without changing the external appearance of the car. So far moderate and normal cornering haven't been a problem but it's too wet to try anything heavy. I now have nearly 1 metre of rubber on the road, that's 160mm more than standard and nearly an extra standard front tyre

Edited by SteveA, 23 December 2011 - 10:11 AM.

[siztenboots]

on the NSR, make sure the main engine loom is tucked well out of rubbage. Mine ate the brake light loom on the Highland hoon. (no mud guards on mine)

[smiley]

What did you need to do to squeeze them in?

A vectra.

[FLD]

What did you need to do to squeeze them in?

A vectra.

[Mike (Cliffie)]

No doubts from me Steve having driven Max's on Joe's big wheels at Snetterton.

[MAXR]

No doubts from me Steve having driven Max's on Joe's big wheels at Snetterton.

It's a big improvement over the usual 195/225 R888/ AO48 setup most trackers are used to. After trying the Kumho V70's, I was impressed, mind you, I'd imagine 255 AO48's would be pretty impressive too. The extra width must be where the gains in grip are?

Steve, did you have to use spacers? I need to order a couple of sets of tyres soon, but not sure which ones. I do also want a wet set too, that can cope with a dry track as well...I'm of the opinion that Maybe I should just learn to cope on the dry tyres & get a proper wet suspension setup.

I have always hated driving my VX on a wet track...but, my old 2-Eleven was absolute blast in the wet with its TC & ABS and I'd like to master driving quick in the wet.

[SteveA]

No spacers on the back but I don't run massive camber and my car isn't that low in comparison to some on here. I'm using 16mm spacers on the front but only because I moved my old rear ET35's forward.

Edited by SteveA, 23 December 2011 - 12:14 PM.

[Nev]

Blimey, if you can squeeze 255s in the OEM rear clam that gives me hope that my wider body will allow considerably more. What rear size wheel and ET did you use ?

[SteveA]

9J ET30

[JohnTurbo]

Pics or STFU

[SteveA]

Fair enough [attachment=23626:tyre.JPG] Happy now

[JimmyJamJerusalem]

Been telling you guys to go wide for AGES!!!!! My 245's rub on Uber hard cornering!

[JohnTurbo]

Lol...and a stance picture? :-D

[SteveA]

Will take some pics tomorrow.

[2-20]

A french guy has tried different tyres dimensions on the same track (Nogaro) and found the following time results:

Test R888 GG 195/50/16 - 225/45/17 : 1.46.21
Test R888 GG 215/45/17 - 235/45/17 : 1.45.38
Test R888 GG 215/45/17 - 235/40/18 : 1.44.85
Test R1R 215/45/17 - 225/40/18 : 1.46.11
Test FEDERAL SS595R 215/45/17 - 235/40/18 : 1.45.42
Test YOKOHAMA AO48 215/45/17 - 235/40/18 : 1.44.95
Test YOKOHAMA NEOVA AD08 215/45/17 - 235/40/18 : 1.45.04 (less wear than toyo R888)
Test DUNLOP COMPETITION CR311 190/625/17 (X08) - 220/645/18 (X04) : 1.43.75
Test DUNLOP COMPETITION CR311 190/625/17 (X12) - 220/645/18 (X08) : 1.42.84 Very quick wear too soft for track use
Test DUNLOP COMPETITION CR311 190/625/17 (X08) - 220/645/18 (X04) : 1.44.05 Tyres recut 25 %

[Korkey]

Hello 2-20. That is really good information. Now talking about ROAD USE............Please let us NOT mix road and track formats from here on in, as I will be asking for the members views on quite a few things. I have over the last 4 weeks been trying various tyre widths on various rims. I started this quest because of the following. I like the standard suspension set up with regards to the spring rate and the shock absorbing of the same. This is not to say that I will not modify what I have at some point. I started by trying to cure the very minor annoyance of understeer which takes place when the car is pushed very hard. EG, exiting a large dual carriageway round about at high speed and then stamping on the power asap. Now I have a stage 2 Turbo, 245Bhp, 252LbFt torque car, figures by Courtenay. I decided to eliminate this problem by way of just creating more mechanical grip at the road surface by way of wider front tyres. To that end I have ended up here......... I just want to say now that I am on an ongoing program of element by element improvement of my car, but by as cheap a way as I can do it. This is because I spent £65,000.00 on my TVR Tuscan Speed Six over the last 8 years getting it to where it is now. I did it because I use to earn good money, so I could. But that is not the case now. Also I paid a very high price for that as I have just sold the Tuscan for £27,000.00p. Not a very good return. OK, so now you see how and why I am coming to these improvemensts. I now have what I think is the best tyre/wheel set up for road use and I would hope for up to the 300/325 bhp where I want to end up. I run standard Turbo rear wheels on both the front and rear hubs. On the rear I have 235/45 x 17".............now this is only 9 mm larger in diameter than the 225/45 x 17 tyre, so the car sits 4.5mm higher at the back. On the front I have 215/45 x 17". I have tried a wide range of front tyres but this one does the job 100% with regard to eliminating the understeer. I found that the 225/45 x 17" on the front picked up some odd sort of bump steer feelings through the steering wheel on even "flatish", these are public roads of course, so flat is at best fleetin, road surfaces. Then yesterday I drove my car a long way and along a lot of very bad roads. At this time I noticed some slight, I mean slight, steering wheel feed back. Again along the lines of bump steer, but was it bump steer? These are my suspension settings. I have just had them checked. Front castor LH & RH 2 degrees 30' Camber LH & RH 0 Toe in 0 degrees Rear camber LH & RH -1 degree 15' Toe in 0 degrees I am new to this car and so would value more experienced owners views on what this "twich" might be. And what a different set up for the suspension might help. At the same time I also fitted 308mm diameter brake discs to the front of the car along with my Mintex 1155 which I have front and rear. The brakes are very popwerful. I have the ABS turned off it would seem. The car came like this. I have noticed the change from the slightly smaller diameter discs, but at the same time I went from Mintex 1144 to the 1155, so maybe just the pad. A big thank you to who ever it was for saying .............. regardless of the maths............you will need 11mm spacers and not 10mm to make the callipers fit..........he is right. Spot on. I machined the spacers at 11mm thick by 24mm diameter with a bore of 10mm from AE30 alluminium. And use HT longer bolts. Getting there I feel. Korkey.