I've been taking a few days to reply because this situation is extremely perplexing to me. I was hoping that others might chime in with their thoughts, but maybe nobody else knows for sure what might be going on.
Regarding nitrogen, it should be no problem to put regular air in them if you want to increase/reduce your pressures. I believe the door jam recommends 35psi but I think that is a little high and I generally run mine at 31 or 32 I believe. Keep in mind the psi will increase when the tires get up to temp, so you don't want to have them at too high of a psi when cold.
About the behavior/handling of the car now with the different wheels and tires, could it be partially due to tread compound? Maybe these tires are stickier and thus as a result you're now feeling limitations of the suspension instead?
Do you have a local 86 club that you could get to give you some insight? Perhaps someone else with an 86 could drive your car and/or you could drive theirs, to determine if there is something drastically different going on here?
Also I would put a couple hundred miles on them if you can this weekend and see if that helps. It just doesn't make sense to me why going with a same size wheel and tire combination as stock but +35 instead of +48 would make this much of a difference in the car's driving/turning behavior.
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Originally Posted by Spacemane969
The tires came mounted and balanced with nitrogen at 35 psi all around. However the fronts have lost about 1 or two psi each..I havent messed with it because I don't know if I can just start refilling with regular air now.
Also I'm not sure what this is an indication of..but the car has lost that feeling of the car "following" the road. So when making even modest turns below say 60mph ..I actually have to provide the input allll the way into the turn and an equal amount of input out of the turn. So imagine the car just barreling straight coming out of a turn. Also I have to constantly fight the wheel going completely straight down a flat highway..It sounds ameteurish but it's actually a lot of work to keep it in my lane and I have to constantly stay on it. I've almost even run a curb or two because the required input is just too much and too slow until the car responds.
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