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Non run flat tyre pressures
- Thread starter Johnbmwz4
- Start date
That's what I have in my E85 with non-RFTs, and what I would recommend.Johnbmwz4 said:Hi, I have non run flats on my Z4 and have been putting 36 psi in the rears and 33 in the fronts as per the handbook but are these pressures only for the runflats?
My car is 2004 3.0 and has 18 inch 107s on
Thanks
I'm on 18's and run 33/35 front rear with even tyre wear
Zedona said:Z4Ms are not fitted with runflats and the handbook recommends 30F and 32R. The pressures for runflats are too high for conventional tyres
+1
A lot of us run M spec tyre pressures with non runflats. Some even run a couple of psi lower than M spec on the basis the non M zeds are a good 100kgs or so lighter than the M cars
Conventional xl tyres with the correct rating can easily deal with pressures of up to 50psi. As somebody also points out the M tyres have a bigger side wall and when I've run my non runflats at 30f 32r the coupe just doesn't handle right compared to when I use the specified coupe pressures which are higher than roadster pressures. When I spoke to the guy who did my last wheel alignment who was very knowledgeable he said pressures and load ratings are a lot to do with camber and suspension set up and he said even if you run non run flats to go with the stock pressures. From my own subjective point of view the car handles miles better with the recommended pressures. With the lower pressures the car feels too loose; and the rear doesn't feel attached to the front.Zedona said:Z4Ms are not fitted with runflats and the handbook recommends 30F and 32R. The pressures for runflats are too high for conventional tyres
What pressures do you run on then?
I'm minus 1 psi on all tyres, so 32 front, 35 rear and it handles perfect. Any lower than that in the front tyres and I feel it handles a bit worse. Not sure why or how, it just does.
Infact a while back the car was driving odd and the ride was very bumpy. Checked the front pressures and they were down at 30psi.
Infact a while back the car was driving odd and the ride was very bumpy. Checked the front pressures and they were down at 30psi.
Leadfoot Z
Member
I have just fitted 4 Michelin Pilot Sport 4's Non Run Flat and I use the standard pressure - 33 front and 38 rear - the same as the run flat pressures. Ride is totally different to the run flats. I intend to tweat the pressures after another 500 miles to try and fine tune the handling, but so far very good.
So far with DSC engaged no wheel spin with set off on dry road. The run flat bridgestones would spin up a little - Michelins just grip with no fuss.
So far with DSC engaged no wheel spin with set off on dry road. The run flat bridgestones would spin up a little - Michelins just grip with no fuss.
33 front 37 or 38 rear, feels absolutely nailed with these pressures.Scooba_Steve said:What pressures do you run on then?
That's exactly how my car feels when the pressures are low, bumpy at low speed and disconnected when going fast. You can literally feel the rear tyre wall deforming round the bendsben g said:I'm minus 1 psi on all tyres, so 32 front, 35 rear and it handles perfect. Any lower than that in the front tyres and I feel it handles a bit worse. Not sure why or how, it just does.
Infact a while back the car was driving odd and the ride was very bumpy. Checked the front pressures and they were down at 30psi.
Running Goodyears. Best for my set is 30/34
When they get hot the pressures go up so I dropped them to where I normally run as above but that requires a 27/31.
If my drive to work was short I would not have the manipulation, but summer here and my drives 30 mins so the tires warm up well, thus increasing the pressure where they feel best. If that makes any sense. Over the winter 33/36 felt best.
When they get hot the pressures go up so I dropped them to where I normally run as above but that requires a 27/31.
If my drive to work was short I would not have the manipulation, but summer here and my drives 30 mins so the tires warm up well, thus increasing the pressure where they feel best. If that makes any sense. Over the winter 33/36 felt best.