I know the general principal behind the CAI and SRI, but how much difference do they actually make in performance? Enough to actually feel and see? Also, does anyone have any suggestions that are just as inexpensive, easy to change, and unnoticable as CAI and SRI? I‘d like to have a performance change but not TOO much sound change or anything noticable in the engine bay. Thanks! :)
Stick with the pressure on the car door for all tires. This is the pressure for the stock wheels so if you have lower profile tires then bump it up to 35, maybe 38 or so psi. Keep all four the same. The value stated on the tire is the MAXIMUM safe operating pressure of the tire. The vehicle manufacturer has determined the best pressure based on vehicle weight, wheelbase and loading for their vehicle. The tire manufacturer has no idea what vehicle the tires are going on. As for the vibration. Make sure the wheel bolts/nuts are tight enough and if that is the case then get the shop to ballance the wheels because they probably messed up.
total myth they only work with carburetors and not with injection systems with the ecu monitoring airflow and temperature, the makers know you are not going to spend $500 testing the car before and after so they can claim what they like
Cold air intake helps in proper combustion of Internal combustion engine. How ? When air is cool more air molecules are readily available for the combustion(oxygen) This will give you instant performance. To have performance change, need to re-map your computer, but that will be fuelish.
Your tires should all be equal pressure, also check to make sure the lug nuts are tight. The shop that installed the new one may have forgotten or not bothered to balance it, take it in and have it rebalanced. Also if it's a different tire (tread pattern) this can cause a shaking effect as the two tires on that axle are gripping the road differently, you should always try to keep the tires the same type.
yes you should have all 4 tyres of the same brand type and size, as not all tyres are exactly the same even though they have the same size and ratings the actual tyres can be slightly different sizes and now you probably have 3 tyres exactly the same and 1 tyre that's slightly a different size, but as for pressures all your tires should be at the same tire pressures or if you run more or less at the front or back then those 2 tyres should be at the same pressure. so i'd try making all your pressures the same and see if it gets better, if not then maybe go back to the tire shop and just tell them what's going on maybe they will rebalance that wheel and tire that they fitted as they might have not balanced it properly in the first place.
