Tire pressure???

[JcsMP3]

Ok I have a question for all you guys.

My mp3 manual requests 32 Psi's int he front and 29 in the back. Now our tires have a max psi rating of 55. Now I know that if I crank up my tires to 55 I will get way better handling but a harsher ride.

Now I am running at 45 psi's during the summer cause it averages out the harsh ride and the performance effects. Now if and when I crank my pressur to 55 which I have done on the track. WIll that effect the tire wear. I can't see to find anything about over inflating on the internet.. only under inflating... Wil this give me uneven tire wear and what are the negative side effects of putting 55 psi's in there... if there are any.

I am asking cause my friend drives a Mustang Cobra and he isnt' sure about craking his tires up to his max of 44 psi's. Any links of written info will also help.

Jc

 

[cjstringer]

First off, why are you running at 45 PSI? Do you know how to check the rollover?

I run 34F/29R for daily driving.

I run 41front and 34 rear for RACING! That puts my tires at optimum pressure with no rollover for racing. Higher than that and you are not getting any traction.

Basically at 45psi you are running on the center of the tires and not using the edges at all. You will run down the tread life considerably. The manufacturers make the 32/29 recommendation for a good reason, and that is that they are correct! Most anyone can get good performance and tread life at those conditions. I use a little higher in the front daily as I am a bit aggressive.

You should NEVER need to run 45 psi on the dunlops. That's just nuts. You won't even ever need it on the track. TRUST ME! I know what I'm talking about here. I have experience.

To sum things up, unless you want to be buying new tires all the time and have tons of money to do it, get with the program. Run a logical tire pressure setup like my 34/29 or somewhere near that.

Again, I'll list my RACE tire pressures on my site and give you this link to see what works the best in RACE conditions.

You really need to run lower pressures. You're only wasting money and not doing anything smart running them higher.

Not trying to sound like a dick, but a lot of people on here are doing this and it's really stupid.

 

[JcsMP3]

Jc'S MP-3

Ok well your attitude can be toned down a little. I am asking a simple question as to which I am far from knowledgeble on. Yes I do know how to check for roll over, you take a chalk and you put a line on your side walls and you drive around like normal and see how much of the line is gone....

Now the max pressure for our tires do say 55. As far as all the tire guys I have talked to... They never made any mention of the tire wearing down in the middle faster then on the sides if you put max pressure in it. only if oyu go higher then max

I was running 45 at the track and I was getting role on the sidewalsas there was wear, this was said by a guy that has been racing everything from go karts, cars and even motor bikes for over 12 yearshe is 42. so i cranked her up all the way up cause I trusted him and unfortunatly he is isn't around right now to answer my question. Now your driving and mine driving styles are two different things. My street style is very aggresive and I am sorry but 32 is just too soft for me.. and so is 34... I tried... the tire roles...

Now I called mazda and SVTOA ( Special Vehicule Team Owners Association) on this issue and all ford company cars which do include ours put on a middle of the road pressure... the tire pressure recommended is a middle of the road thing... it has nothing to do with perfect tire wear or maximum handling ability.


Jamie

 

[cjstringer]

I know the tires say max pressure of 55. The point of that rating is so you DON'T put it there. The tires become unstable and have a tendency to explode if pushed at that level.
I truly don't believe your road driving ability is to a level where you need to run 45psi. If your street driving is more aggressive than that of mine on the race course, I seriously feel sorry for anyone that ever has to drive near you.
I'm not trying to give you attitude, but it's just not at all logical.
Do you take every turn you ever make over 60mph or something? I can't imagine our tires rolling over at all at that rate.
When racing a tight course with fast transitions and I bump the tires to 42psi I can't get enough roll to cover the change and have to back it down. Yes, 1psi can be a HUGE difference.
I will post some pics this evening of my tires with the wear that is correct for what you should be measuring. If you could get some to show me your excessive roll at 45 I'd be really interested.
Unless Dunlop decided to make our tires completely different, I just can't see it being a good idea.
Anyone else gonna comment? He's asking a really good question and I feel bad for taking out my frustration in this thread, but I see it a lot and I really wish these prro Dunlops would get a fair share at life!

 

[JcsMP3]

Thanks for the info... and sorry if I was using some attitude back.... I just had this heated discussion with my gf so that thread didnt' help... LOL

I just called dunlop and it makes sense to me now. I guess they use Tire pressure for dummies on me or something....

The pressure recommended by the manufaturer is a middle of the road thing. They leave room for customer error. You can crank it about 5-7 more psi's then what they recommend and you still have even tire wear. They just dont' recommend that cause it does bring a harsher ride.

Now 55 was put on tires cause let's say they use those tires on a mustang or something that weight about 1000 lbs more then ours... they require a little more pressure to have the tire perfectly flat and at it's peak performance. My friend is runnin 235 on his car... but they onyl recommend the same pressure as us... weird but I am going to have to put fate in the manufactueres

Now wider tires on our cars will require different pressure? Now I want to see what the new mp3 will be recommending.

Jc

 

[JcsMP3]

BTW Dunlop is owned by Goodyear.... I never knew this....

Jc

 

[cjstringer]

Actually, the wider ones are about the same. It may be 1 or 2psi higher, but not much at all. It has to do with the physics of the tire material itself and the support it requires. Remember, PSI isn't a volume thing, it is the pressure exerted in all directions per unit of volume. It's all messed up.
Anyway, go ahead with the 5-7 up thing. It's a good idea.
Oh, and, they are a goodyear subsidiary. I know because I am currently workin gwith them on a deal to make my car a little faster.