Tire Pressure?

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97V8SHO

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What would be the best tire pressure for 235/45 ZR17's? This is a dialy driver and I do autox once a month.
 

stephen newberg

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Glue Maker said:
32-35 works best for all applications IMO. Except for trucks....

LOL :)

Paul is right, though, in that it is sort of dependent on the particular make and model of the tire. With my current Bridgestone 950s in that same size, and my other suspension mods (Front Strut Tower Brace and 23mm Rear Anti-Sway Bar), I have found I can get pretty neutral steering results across a large speed band with 36 in the front and 32 in the back, cold. The best thing to do is to play with it a bit, varying only the front or the back at a time, until you get the handling results you are comfortable with or have been trying to get.

pax, smn
 

97V8SHO

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The max psi rate is 51 and they're Goodyear Eagle F1 GSD3's. The guy that mounted and ballanced them put 40 in them. I was talkin to my bro about this and he runs 45 all round in his on his cobra, but he has a 245. I'm happy with the way it handles now my mian reason for asking is to get good tire wear because the tires cost me $680 for the set...more than my new rims cost lol. Only true handleing problem i'm having is that I plow into corners because of all the suspension work done up front and nothing in the back...anyone know where I can get a 26 or 28 rear sway?
 

stephen newberg

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By "plow" do you mean it is oversteering?

51 is a pretty high max. Considering the list of mods you have, I would suggest trying something like 44 in the front and 38 in the back. See if that takes away some of your 'plowing' effect.

From a tire wear standpoint, most of the time you tend to get the most even wear under general use conditions if you are running at about 80-85 percent of the max for the tire in the front, and normally a bit less in the back. The back varies a lot more, though. This is on front engine, front wheel drive. It differs for other arraingements.

Also, how you drive comes into it, so that is just a rule of thumb. If you are doing a lot of hard cornering on less than even pavement, you might find that this is wearing the sides faster than the middle, so you would increase the pressure a bit. If you are doing a lot of straight, fast stuff, you might be getting too much wear in the middle, and need to decrease the pressure a bit.

In general, you need to play with it every time you try a new make/model to get a feel for the differences. Also, whenever you change the suspension, such as the 26mm RSB you are thinking about, you will have to test around on pressures again.

pax, smn
 

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