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      12-14-2011, 07:50 AM   #45
phil200tdi
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Currently front 35psi/rear 38psi.

I think loads are:
225/40/18s are 92
255/35/18s are 94
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      12-14-2011, 09:26 AM   #46
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Thanks chaps, will change to roughly your pressures and give that a try
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      12-14-2011, 04:30 PM   #47
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Quote:
Originally Posted by phil200tdi View Post
Currently front 35psi/rear 38psi.

I think loads are:
225/40/18s are 92
255/35/18s are 94
Did you notice before breaking them in that they tramlined and tugged a bit? Seem others on this forum found that at the start and then came good.
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      12-15-2011, 05:01 PM   #48
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Quote:
Originally Posted by seanblee View Post
I run 34psi front / 36psi rear on my 18" non-RFTs - works well for me. What's the load rating on those 452s?
Gone for these settings and the car seems ok at the moment, still tramlines but i guess you'll never get away from that with big wheels.

I know its wet atm but the rears really are spinning and back end is coming out on roundabouts which can be fun but i do hope after a few more hundred miles they start to grip better.Anyhow there a lot better than rfts lol.

Noticd when looking at the fronts they do seem low compared to the rears but i guess thats the engne weight as well. Reg non rfts, should i maybe go up another psi to 35 on the fronts like phil200tdi??
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      12-16-2011, 04:31 AM   #49
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Quote:
Originally Posted by carbonSI View Post
Noticd when looking at the fronts they do seem low compared to the rears but i guess thats the engne weight as well. Reg non rfts, should i maybe go up another psi to 35 on the fronts like phil200tdi??
Good question. The end of http://marktg.toyotires.com/file/loadinflationtable.pdf gives you the table of load indices versus inflation pressure for XL (reinforced) tyres so that you can see what actual load (in lbs) a tyre at a given pressure can support. RFT vs non-RFT isn't really relevant - it's all about the load rating.

In my case, my ContiSportContact 5P tyres are 95 XL on the front and 94 XL on the rear. At my pressures, this translates to 1284lb front and 1312lb rear load capacity and gives a relatively comfortable ride with minimal flex from the tyres and very even wear.

In the case of the Falken FK452s, they're again a 94 XL on the rear, so 36PSI for 1312lb is just fine. However, on the front they're a 92 XL, so in order to get to 1268lb you need to inflate them to 38psi, but that feels quite high to me. At 36PSI they're rated to 1235lb, which is plenty, so I'd start at 36PSI all round and see how that goes.

FWIW, I run my winter Falken HS439 set at 33psi front, 32psi rear (on 17" wheels), again because of the difference in load ratings (94 XL front, 98 XL rear), and I find that very comfortable with no real flex or movement in the tyre.
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      12-16-2011, 05:10 AM   #50
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Quote:
Originally Posted by seanblee View Post
Good question. The end of http://marktg.toyotires.com/file/loadinflationtable.pdf gives you the table of load indices versus inflation pressure for XL (reinforced) tyres so that you can see what actual load (in lbs) a tyre at a given pressure can support. RFT vs non-RFT isn't really relevant - it's all about the load rating.

In my case, my ContiSportContact 5P tyres are 95 XL on the front and 94 XL on the rear. At my pressures, this translates to 1284lb front and 1312lb rear load capacity and gives a relatively comfortable ride with minimal flex from the tyres and very even wear.

In the case of the Falken FK452s, they're again a 94 XL on the rear, so 36PSI for 1312lb is just fine. However, on the front they're a 92 XL, so in order to get to 1268lb you need to inflate them to 38psi, but that feels quite high to me. At 36PSI they're rated to 1235lb, which is plenty, so I'd start at 36PSI all round and see how that goes.

FWIW, I run my winter Falken HS439 set at 33psi front, 32psi rear (on 17" wheels), again because of the difference in load ratings (94 XL front, 98 XL rear), and I find that very comfortable with no real flex or movement in the tyre.
Thanks for that seanblee was quite interesting, will up the fronts to 36 and give that a go as they do seem to be under inflated at the front. I have been told on this forum tho that upping the psi does nothing to quell the tramlining??
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      12-16-2011, 01:01 PM   #51
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Even with XL tyres and using pressures to suit the load rating, you still need to experiment for road feel and tyre wear.

The XL may be carrying its maximum load rating at 41psi, rather than 36psi for a normal tyre, it doesn't mean that when running with one passenger we need the full pressure. Obviously we up the pressures for a full load.

Tramlining can often be lessened by increasing presssure, as it is the shape of the tyre that is critical, too low and we are loading the outer shoulders more than the centre crown of a tyre, forces then get transmitted back through the suspension/steering, the stiffer the side walls the more sensitive to lower pressures. It is not always lower pressures that reduce tramlining.

There is no problem trying a higher pressure, say 38psi up front, and seeing the result.

I know my last tyres, Goodyear F1 GS-D3s, were very sensitive to pressure, drop a couple of psi and I'd get a bit of tramlining. Keep them at/above 35psi (mine are 17") and no issues. Falken 452s in the same size and same 94Y XL rating, need the same sort of pressure.

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      12-17-2011, 07:58 AM   #52
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Quote:
Originally Posted by HighlandPete View Post
Even with XL tyres and using pressures to suit the load rating, you still need to experiment for road feel and tyre wear.

The XL may be carrying its maximum load rating at 41psi, rather than 36psi for a normal tyre, it doesn't mean that when running with one passenger we need the full pressure. Obviously we up the pressures for a full load.

Tramlining can often be lessened by increasing presssure, as it is the shape of the tyre that is critical, too low and we are loading the outer shoulders more than the centre crown of a tyre, forces then get transmitted back through the suspension/steering, the stiffer the side walls the more sensitive to lower pressures. It is not always lower pressures that reduce tramlining.

There is no problem trying a higher pressure, say 38psi up front, and seeing the result.

I know my last tyres, Goodyear F1 GS-D3s, were very sensitive to pressure, drop a couple of psi and I'd get a bit of tramlining. Keep them at/above 35psi (mine are 17") and no issues. Falken 452s in the same size and same 94Y XL rating, need the same sort of pressure.

HighlandPete
Well thats what i thought about higher pressures, thnx for the info Pete! Currently running the 35psi F 36psi R and will see how this experiment goes lol. tried 38psi F already and the handling was too bouncy...

This is how i want mine to handle lol http://www.youtube.com/watch?v=pTIwNsqFQYc
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      12-18-2011, 03:39 AM   #53
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Equivalent prices khumo suppose to be as good too
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      12-18-2011, 03:42 AM   #54
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      12-18-2011, 06:59 AM   #55
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Equivalent prices khumo suppose to be as good too
Yep. I've used the Falken FK452 and the Kumho KU31, and been equally impressed with both. If anything, I found the Kumhos a little quieter and more comfortable with no less grip.

There's a new pattern/compound out now, the KU39 - not many reviews yet but if it's an improvement on the KU31 it will be a good bet.
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      12-18-2011, 09:11 AM   #56
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Now running 36F 38R and still find i'm fighting with her all the time bar the smoothest of roads. This isn't what i expected bmw ownership to be like, really could do with driving another si at a dealer to see if they all do it. Something tells me that mines a bit of a duffer lol.

Might have to move on if things don't improve with more miles, which is a shame considering i only got it in Feb this year! Gf thinks i'm mad keep talking about my dodgy steering lmao! This can't be right, but i found my mk5 golf a better drive, maybe i prefer fwd!??!

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      12-18-2011, 09:38 AM   #57
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Have you had your alignment checked? Sounds more like to little toe-in to me.

Must be bad as the Mk5 golf has ultra-wooden audi-esque deadpan soulless steering...
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      12-18-2011, 09:58 AM   #58
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Its got to be hasn't it Doughboy, i never thought the mk5 was full of feel but at least you could make quick progress with confidence unlike this car, just don't feel confident pushing it, as the car seems to crab sideways like floating, then you have to make little adjustments where the golf would arc into corners quite well.

Bmw checked power steering, front geometry, had kds done at an indy on a hunter machine. Found nothing! Damn haven't got the results with me from kds but chap said was all within spec for for e90 as they don't take into account in the software if its m sport or not.

Doughboy you've got a petrol 3 series, whats yours like to drive? do you find any of my symptoms in a small degree??
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      12-18-2011, 11:15 AM   #59
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have any of you guys had problems with your insurance companies when changing to non-rfts?
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      12-18-2011, 11:20 AM   #60
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Quote:
Originally Posted by m1bjr View Post
Depends if the wife kerbs the alloy wheels after fitting.
The Falkens dont have rim saver lips on them.

any recommended tyres that do have rim saver lips?

vredestein?
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      12-18-2011, 12:11 PM   #61
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have any of you guys had problems with your insurance companies when changing to non-rfts?
Nope. My non-RFTs exceed the load and speed ratings of the OEM RFTs - there's nothing to tell the insurers about.
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      12-18-2011, 03:36 PM   #62
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Ive just remembered that when i had kds done at chemix, they said it was for an e90 and doesnt matter if its sport or not. Just seen a bmw print out and that shows for m sport suspension. maybe i do have to have to take it to bmw to be aligned to get this sorted once and for all.
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      12-18-2011, 06:03 PM   #63
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Had the falkens, and they lasted well,

Next tires for me .. KU36

100%

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      12-19-2011, 03:34 AM   #64
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They look nice... Semi slick though?
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      12-19-2011, 04:20 AM   #65
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New Falken Azenis FK453 'flagship' tyre arrives next spring. Wonder how that will be received?



New Falken 2012 brochure is now online.

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      12-19-2011, 08:10 AM   #66
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Please can someone take a look at the attached kds read out for my car. My father reckons theres nothing wrong with it and il have to wait at least 1000 miles for the falken to bed in.
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