Front wheels tram lining
- Thread starter CHIMV8
- Start date
You guys running lower pressures, do you not notice the ride is quite hard?
I lowered mine to 30 front, 32 rear and the ride was awful. I nearly broke my back on the smallest of potholes/drains. I then increased them to standard pressures 33 front, 36 rear and it feels much better.
Most of my driving involves high speed commuting, rather than country lane twisty driving, so maybe that's why?
I lowered mine to 30 front, 32 rear and the ride was awful. I nearly broke my back on the smallest of potholes/drains. I then increased them to standard pressures 33 front, 36 rear and it feels much better.
Most of my driving involves high speed commuting, rather than country lane twisty driving, so maybe that's why?
Interesting Ben. I only started to get that when I went f28 r30 but I am running m sizes so that may have some bearing I'm not sure.ben g said:
F30 R32 are the pressures the m runs and I know thats a different car but the basic architecture is very similar and if anything you'd think the m might need a bit more pressure as it's circa 100kgs heavier than a 3.0
MACK said:
It does seem strange. My missus even commented on the hard ride and she's the most anti car person ever :lol: I checked my pressures and the fronts were at 29.5psi, rears 32.5psi so not far off your suggestion.
I guess it's a bit of a subjective thing. Mine on vredestein Vorti's seems to be better suited to the higher pressures.
MrPT said:
...& then how can you be sure the Indy’s gauge is correctly calibrated from constant use & increased chance of knocks.
I have 2 digital gauges, exactly the same make - one is always 1.5psi higher than the other, so work on the basis is better to potentially over inflate than under inflate by using the lower reading.
It's a good point you make. I usually use my ring compressor. When you say yours was out was it over reading or under reading against the garage kit? I do have access to garage kit so I may try a side to side comparison but as already said I won't actually know which one is out. Indeed it could be both to some extent.MrPT said:
Just a thought, tyre pressure wise are you guys measuring from cold? I'm measuring from cold stood overnight etc.
MrPT when you compared your ring compressor with the indies kit did you do use yours at home and then drive there to use theirs. If so that would probably account for the difference
MACK said:
Nope, one after the other on the same cold tyre (which had been off the car for a day). Even with cold tyres though, you can get 1-2psi difference between the sunny side of the car and the dark side.
It was under-reading and I found out because I upped the pressures to 32psi all round and it made the ride ridiculously hard (so much so my wife noticed). I then checked with the digital gauge which read 33-34psi, which I assumed at the time was accurate. Then a few weeks later I took the chance to check at an Indy I know well. Not sure if it was the case for theirs, but I know that some professional compressors come with a factory calibration certificate and you need to regularly recalibrate them for that to be valid. Whether they bother or not is another matter!
Another thing to point out is just how abused that Ring compressor has been over my 5-6 years of owning it! It literally gets thrown around between cars (and bikes, sometimes) on a weekly basis.
I don't think there's anything wrong with using the same compressor to maintain and experiment with pressures. I just feel a bit silly for recommending various exact PSI readings over the years! :?
I haven’t yet found the “correct “ pressures for my non-runflats but the sticker is a good place to start!MrPT said:
Some good points you raise there. I've noticed the sunny/shade side thing myself. The car doesn't even have to be in the sun all day either, I've seen this effect as early as 7am on a summers day.
I guess bearing in mind the differences in tyres and compressor readings etc. General advice of starting around the M pressure of F30 and R32 on whatever compressor your using (based solely on the M coming with non runflats from the factory) and playing around from there is as good a starting point as any. Our cars are supposed to have close to a 50/50 weight distribution and I've been lead to believe less pressure on the front is used to induce understeer so maybe trying the same front or rear is worth a shot. I seem to remember the old Z3 3.0/M ran the same front and rear as do MX5s and even 5 seater cars like the M135i. The M135i is an interesting one actually as the lesser models do run less at the front. Having just said that I've also been advised that the rear needs a bit more pressure as they're the driven wheels so maybe less on the front is actually correct. Its all a bit conflicting!
All this reminds me I've been meaning to have a play around with the front pressures on mine now I'm running GY F1s instead of the PS3s but I've been waiting for some consistent warmer weather conditions, as the ride always feels harder in cold temps due to the tyres being stiffer, again something else to consider