PistonHeads.com Forum

T350c wider rears

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Talksteer

Original Poster:

2,970 posts

151 months

Wednesday 26th January 2011
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Is there any advantage for going up to 245 section rear tyres/wheels on a T350C?

I did think the T350 is a little under tyred for a car with 350bhp and I did see a car with larger wheels on it when I was searching for my current car.

tranter5

350 posts

82 months

Wednesday 26th January 2011
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My Tamora is running 255's on the back and seems, fine plenty of traction!

samantha

206 posts

122 months

Wednesday 26th January 2011
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Hi Have just ordered a set of team dynamics pro race 1.2 forged wheels with a 9" rim going to run 265 tyres possibly 275, with a 30 offset,




fredd1e

590 posts

138 months

Wednesday 26th January 2011
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Think the offset might need to go the other way (ie higher than stock) if fitting tyres wider than 255 on the rear (esp on rims wider than the stock 8.5" spiders). Or run a fair bit of Negative camber and very stiff springs (sagaris rates might be needed).

Mattt

16,270 posts

136 months

Wednesday 26th January 2011
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I plan to go 255 Eagle F1A on the rear when due for change.
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s5tvr

1,237 posts

151 months

Wednesday 26th January 2011
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samantha said:
Hi Have just ordered a set of team dynamics pro race 1.2 forged wheels with a 9" rim going to run 265 tyres possibly 275, with a 30 offset,
Be careful going to 275 (possibly even 265) and make sure you're not going to have any clearance issues. I have 265's on mine now and the previous owner had 275's on at one point, but he did have the wheel arch modified as the 275's rubbed initially.

samantha

206 posts

122 months

Wednesday 26th January 2011
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Happy with the offset, of 30 will give 3mm inside more on width, Keeping the tracking the same, & running a 8" rim on the front with a 42 offset.

Spring rates are being increased to 100nm front 90nm rear


PIW19

146 posts

93 months

Thursday 27th January 2011
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The 19" power rims fitted to my 350 are 10" wide at the back and have 265 / 30 rears which need a geo change to give clearance and still catches slightly unless the spring is wound up tight and damping up a couple of clicks on the Nitrons,great for the track, knocks your teeth out on the road.

Standard wheels are now back on the car and give more than enough traction equal to the wider rims on the road. Both spin up easily in this weather, with the rear so tightly sprung, its worse on the wider option.

fredd1e

590 posts

138 months

Thursday 27th January 2011
quotequote all
18" rims 9" width and ET30 with a 265/35 is going to stick out further than the stock spider by about 8mm or thereabouts, on a 255/35 on stock spiders mine rubs on full compression on the inside edge of the outer arch.
Re front offset on 8" rim you might want to consider reading the spacers fixed my handling thread in the tuscan list as the stock 18" front spiders are about 3mm off from ideal offsets (affects tuscan/tamora/T350 etc chassis).
The SP12 fronts have the ideal offset as standard or the spacers on an ET42 will do the same. Cant use the spiders on t350 with spacers as the wheel well is too narrow frown for the 8.5" rim hence the comprised offset by TVR as std.

PS PIW19 what offsets do your 19" rims have ? there should be an ETnumber stamped on the inside somewhere is the range 30~45 probably.

Edited by fredd1e on Thursday 27th January 11:05

samantha

206 posts

122 months

Thursday 27th January 2011
quotequote all
the speed 12 are not in stock, and they dont know when they will be getting any, According to Andy at TVR power

|So the the pro race 1.2 can be ordered,

What would be the ideal offset on a 18x8" rim?

And the 18x 9" rims

I can adjust the offsets as they are being made to suit,

Please advise so I can adjust to the cosrrect offsets before they get made.

Cheers

fredd1e

590 posts

138 months

Thursday 27th January 2011
quotequote all
Spiders for a T350 are 42mm Offset front (ET42) and 33mm offset rear (ET33)
To correct the fudge TVR did with the spider on the front you'll need 39mm offset, remember with most car wheel offsets the lower the number the more the wheel sticks out (for a given rim width) and you can only use this offset if the rim width is 8" or lower as 8.5" will sit outside the wheel arch on the front of a T350/Tamora.
For the Rear on mine I'd consider offset of 35mm to 38mm if looking at a 9" rim, though if anyone with SPs can comment on what they are rear that would be useful.

Tyre sizes are also problematic on a T350 front as "trackday" tyres usually dont come in a 225/35x18 and nearest is usually 225/40x18. This taller tyre can rub like a dog with piles in a T350's front wheel well, usually outer arch at the front lower edge, below headlamp access panel and upper inner arch on full bump, manufacturing/repair tolerances can give raise to varying degrees so yours may be ok or not.
Rear I think you could push 265/35x18 in on the right offset but I dont have enough feel for the range of offsets/rim widths that will work. Best bet would be to fit the front spider to the rear to see what clearance an ET42 wheel has on the rear inner arche/suspension and work it out from there.

Perversly with tyre sizes wider isnt allways worse as I've found the stock 235/40x18 worse for clearance than a 255/35x18 as the wider tyre isnt as tall.
Good tyre offset calculator here but it only gives clues not specifics to the T350. http://www.rimsntires.com/specs.jsp

PS my quick fag packet play with the calc indicates that for a 10" rim on the rear ET40~42 would be about right to fit 265/35 tyres (larger like 275s are probably too tall on a 35$ profile) this would need checking on the inside for wheel well/wishbone/shock/chassis clearances as mentioned trying a front spider on the rear will indicate where the tighter clearances are so just figure what they'd be like with an inch more rim/tyre width in there (25mm for the younger members)

Edited by fredd1e on Thursday 27th January 19:16

fredd1e

590 posts

138 months

Thursday 27th January 2011
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PS if it don't fit dont blame me...

samantha

206 posts

122 months

Thursday 27th January 2011
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I am off to TVR Power tomorrow, I will pick there brains and have a look at the T350 thats in the workshop,

I dont have any 18" spiders to play with apart from some 16" I will look at what opffsets are on them & have a little play,

The arches at the rear have been rubbed by the tyres at some time, However I dont have the tyres that were fitted

I can alter my arches if I need to as the car is under repair & needs repainting anyway So I have the option I am using Khumo track tyres med rubber, 265/35/18 rear, 245/35/18 front

The car is to be used mainly for track & race events,


samantha

206 posts

122 months

Friday 28th January 2011
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I looked at a couple T350s with 335/40/18 &345/40/18 both look fine for clearances,

I am happy with my offsets I have chosen & will alter the car to suit should they catch anywhere,

My objective is traction & the car is to be used for racing mainly, it will have 600lb springs on the rear & 650 on the front which will stiffen the suspension nicely.


With a planned 4.5ltr motorsports engine due to be fitted in october wider is better, i have planned 335 /30/18 for the rear tyres on 12" rims ,


Better widen my arches now,)

Mattt

16,270 posts

136 months

Friday 28th January 2011
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2 not 3 you mean?