f to r psi

[Richard B.]

all my cars i have always kept the exact same pressure front to rear. i usually ran 35 for any car or tire.

i understand that i now have awd. but...will running the same pressure do anything?

to me it's no different that putting weight in the car and leaving it there. i see no harm in it. i have the 960 a/s if that matters.

[poopy]

manual calls for +2 up front.

[Richard B.]

manual calls for +2 up front.

any reason why i can't do otherwise?? alot of manuals call for different f2r but i have always done 35 all around.

[azca]

+2 in front, otherwise you will get oversteer coming from happy rear end

[EL PAALO]

all around is fine. the car understeers anyway ..... getting it closer to neutral is a good thing.

[azca]

depends on your suspension mods

all around is fine. the car understeers anyway ..... getting it closer to neutral is a good thing.

[edkwon]

i usually have th fronts +2 over the rears, mainly because the weight distrbution is not 50/50 and a little more front heavy, so greater tire pressures in front for the increase weight, better steering response, and reduce chance of oversteer if i drive hard

[sumfoo1]

the car is awd. if you over steer throttle will usually pull you out of it unless you are in REALLY bad shape... then you fall under darwin's jurisdiction and awd can no longer assist you.
Neutral ftw.

[jazzymt]

I was running +2F until I got swaybars & also recently upped my inflation pressure to 44 all around. The car handled great last weekend at an autocross, so I'm thinkin' I'm gunna keep it here - hopefully the tires will wear a little slower & I'll get a bit better gas mileage too.

[gusgusdude]

I recently purchased a set of Goodyear triple treads for my sons beater & the dealer said he always puts the tires at what the tire mfg. recomends not what the car mfg does.

[Brady]

It depends on my tires. In the winter, I run about +2 psi up front (35/33 I think) on the Blizzaks. In the summer, I'll run about 44/41 or 44/40 f/r on my RE050A-PPs. Part of the reason also is that because of the non 50/50 weight distribution, the effective tire diameter is different if you have the same tire pressure. So I THINK part of the reason for the pressure differential f/r is to reduce strain on the center diff.

[ivwarrior]

I recently purchased a set of Goodyear triple treads for my sons beater & the dealer said he always puts the tires at what the tire mfg. recomends not what the car mfg does.

The dealer's an idiot, if he really did what he said he does, he'd be using the car makers pressures. The tire mfg recommends that you refer to your owner's manual for that the car mfg recommends for proper pressure. The only pressure spec tire makers put on the tire is the MAX pressure the tire can safely handle.

[MiniStiGuy]

nice avatat IVwarrior :D

[Xenonk]

there's other parts to consider, especially with wheel and tires sizes if you are not using the factory size... if you do enough research of how load capacities work for a tire, you'll understand why you have to run certain pressures to prevent from your tire from forming knots or bubbles on the sidewalls.

[Xenonk]

all my cars i have always kept the exact same pressure front to rear. i usually ran 35 for any car or tire.

i understand that i now have awd. but...will running the same pressure do anything?

to me it's no different that putting weight in the car and leaving it there. i see no harm in it. i have the 960 a/s if that matters.



before you start, what size tire are you running to begin with?? that matters when you are comparing tire pressures. also, not all cars should run all tire pressures the same all around. Even the factory setup staggers the pressures to ensure rear end stability and safety.

and to your question to running same pressures all around:
yes, it makes a difference, you'll cause the car to oversteer more if you raise the rear to match the front. this is also true if you lower the front to match the rear which will make the car more likely to understeer and have front tire rollover.

lowering tire pressures beyond weight capacity can ruin the sidewalls. adding extra weight to the car and having it parked there where the tires are not properly inflated can flat spot the tire if you let it sit for too long of a time. also, running tire pressures too low which will induce tire-rollover is also not a good sign. If you are more of an agressive driver, check your pressures. FYI, autocross and motorsports tire pressures are definitely higher than what you would normally use on the street. For a 225/45/17 size, street setup you can use something around 36/32 while at an autocross I run as high as 44/38 or 46/40 depending on how I want the car to handle.

Not all cases that your suspension mods play a role because it's the conditions you run in. I can easily use the same suspension setup both in the rain and dry (assume it's stock). If it rains, I can lower the tires pressures to increase my stability (learned this trick from stock production class racing), while in the dry you can bump it up way higher.

lastly, it's not weight, PSI is a pressure, not a weight. And it does fluxuate based on the weather conditions. One day you can have 32 psi cold, but if you drive hard, you can get the tires to warm up to as much as 50 psi (out on a race track) or maybe as much as 42 during towing conditions. Depends on the friction.

Also, proper tire pressures also can make it more stable in the rain (normally lowering them makes it more stable in the rain), while higher pressures can increase your mpg.

If you really want to know more, just PM me.

[Richard B.]

before you start, what size tire are you running to begin with?? that matters when you are comparing tire pressures. also, not all cars should run all tire pressures the same all around. Even the factory setup staggers the pressures to ensure rear end stability and safety.

and to your question to running same pressures all around:
yes, it makes a difference, you'll cause the car to oversteer more if you raise the rear to match the front. this is also true if you lower the front to match the rear which will make the car more likely to understeer and have front tire rollover.

lowering tire pressures beyond weight capacity can ruin the sidewalls. adding extra weight to the car and having it parked there where the tires are not properly inflated can flat spot the tire if you let it sit for too long of a time. also, running tire pressures too low which will induce tire-rollover is also not a good sign. If you are more of an agressive driver, check your pressures. FYI, autocross and motorsports tire pressures are definitely higher than what you would normally use on the street. For a 225/45/17 size, street setup you can use something around 36/32 while at an autocross I run as high as 44/38 or 46/40 depending on how I want the car to handle.

Not all cases that your suspension mods play a role because it's the conditions you run in. I can easily use the same suspension setup both in the rain and dry (assume it's stock). If it rains, I can lower the tires pressures to increase my stability (learned this trick from stock production class racing), while in the dry you can bump it up way higher.

lastly, it's not weight, PSI is a pressure, not a weight. And it does fluxuate based on the weather conditions. One day you can have 32 psi cold, but if you drive hard, you can get the tires to warm up to as much as 50 psi (out on a race track) or maybe as much as 42 during towing conditions. Depends on the friction.

Also, proper tire pressures also can make it more stable in the rain (normally lowering them makes it more stable in the rain), while higher pressures can increase your mpg.

If you really want to know more, just PM me.

stock size. iirc the 960's are rated xl to begin with. but usually i run 35f/35r all year round. if it snows maybe 33 or so.