I recently got brand new Bridgestone Blizzak WS70 snow tires on my 135i with JB4 and my driving experience has changed GREATLY. I did some searching on the internet, but can't seem to find what I'm looking for. The JB4 map I'm using is map 1 which has a boost target of 13psi.
I got the new tires installed on new steel wheels instead of the rims that came with the car for a few reasons:
-The winters where I live are really bad, and roads aren't taken very good care of, so if I end up bashing a brand new steel wheel I will have, by my calculations, roughly 39% less feelings of remorse than if I had bashed up a brand new high end molded rim costing 3x more.
-I made the change from run flats to "real" tires, and it is difficult to find "real" tires to fit the stock rims, especially in a snow tire. The new steelies are 17x7, a change from the stock 18x8.5 for the front and 18x9.6 for the rear. Quite a difference. I plan on going back to the stock rims for when I get new summer tires, but for winters, this is what I have.
So here we are, a JB4 map 1 tuned 135i twin turbo car, a driver whose only experience driving a performance car was with a JB4 tuned 135i on bald summer run flats, and brand new snow tires on steel wheels... I'm confused.
So from limited testing (driving to and from work roughly 15mi away for about a week) I can tell that the car definitely feels a whole lot of different through my daily commute. My first days driving it were chock full of looking at the stability control system light flashing at me on dry pavement and telling me I'm being a bad boy... even when I'm trying very hard to be a nice boy and just follow traffic. Apparently snow tires can't handle torque very well at all? I am now afraid of accelerating in a sporty manner. I did the drive at 60mph and shake the wheel test, and where the car on summer tires was firm, quick, and glued, the same car on snows and steelies was noticeably slower and looser feeling, lagging behind the wheel. I'm now afraid of handling in a sporty manner.
I did find an article about new tires in general and found that new tires of any kind need to be driven for a few hundred miles before they properly "break in" and as I drive them more, I do seem to be seeing the bad boy light come on less and less, but I'm still unsure if that's due to the tires breaking in, or me getting used to driving them? On my second day, I had to go into the JB4 programming and change the gear 1 boost limit to 3psi and gear 2 boost limit to 6psi. I eventually found that just starting in 2nd is probably a better idea, so I've been doing that the past 2 days.
There's also the question of sportiness and fun. The tires I've installed are obviously very good in winter conditions, but how do they fare in a test of sport? If someone wanted to race from a light on summers, I just put the car in gear and wait for the green. Now if someone wants to race I feel like it's not even an option at all, and backing down is not in my personality. What would happen if I launched on snows? I don't get such a very confident feeling from driving on them semi-normally, so I'm afraid to push them. Are we talking about a situation where the car can launch pretty well, but it wears the tires quickly, or are we talking about a situation where the car might go far enough out of control that it's not even worth putting 13psi of boost and ~320WHP to the rear tires? I haven't even disabled stability control since getting the new tires because I'm too scared to. The car has never gone out of control since getting new tires, the worst that's happened was seeing the bad boy light, which happens too frequently to ignore, but I'm afraid of the time when it does go out of control, because maybe it's not as easy to compensate for as summer tires are?
Bonus Round: I've read that the JB4 in map 5 (autotuning map) adapts to tires and driving conditions in a realtime manner. Do you think I would benefit from using map 5 with my new, apparently very high maintenance, tires?
I got the new tires installed on new steel wheels instead of the rims that came with the car for a few reasons:
-The winters where I live are really bad, and roads aren't taken very good care of, so if I end up bashing a brand new steel wheel I will have, by my calculations, roughly 39% less feelings of remorse than if I had bashed up a brand new high end molded rim costing 3x more.
-I made the change from run flats to "real" tires, and it is difficult to find "real" tires to fit the stock rims, especially in a snow tire. The new steelies are 17x7, a change from the stock 18x8.5 for the front and 18x9.6 for the rear. Quite a difference. I plan on going back to the stock rims for when I get new summer tires, but for winters, this is what I have.
So here we are, a JB4 map 1 tuned 135i twin turbo car, a driver whose only experience driving a performance car was with a JB4 tuned 135i on bald summer run flats, and brand new snow tires on steel wheels... I'm confused.
So from limited testing (driving to and from work roughly 15mi away for about a week) I can tell that the car definitely feels a whole lot of different through my daily commute. My first days driving it were chock full of looking at the stability control system light flashing at me on dry pavement and telling me I'm being a bad boy... even when I'm trying very hard to be a nice boy and just follow traffic. Apparently snow tires can't handle torque very well at all? I am now afraid of accelerating in a sporty manner. I did the drive at 60mph and shake the wheel test, and where the car on summer tires was firm, quick, and glued, the same car on snows and steelies was noticeably slower and looser feeling, lagging behind the wheel. I'm now afraid of handling in a sporty manner.
I did find an article about new tires in general and found that new tires of any kind need to be driven for a few hundred miles before they properly "break in" and as I drive them more, I do seem to be seeing the bad boy light come on less and less, but I'm still unsure if that's due to the tires breaking in, or me getting used to driving them? On my second day, I had to go into the JB4 programming and change the gear 1 boost limit to 3psi and gear 2 boost limit to 6psi. I eventually found that just starting in 2nd is probably a better idea, so I've been doing that the past 2 days.
There's also the question of sportiness and fun. The tires I've installed are obviously very good in winter conditions, but how do they fare in a test of sport? If someone wanted to race from a light on summers, I just put the car in gear and wait for the green. Now if someone wants to race I feel like it's not even an option at all, and backing down is not in my personality. What would happen if I launched on snows? I don't get such a very confident feeling from driving on them semi-normally, so I'm afraid to push them. Are we talking about a situation where the car can launch pretty well, but it wears the tires quickly, or are we talking about a situation where the car might go far enough out of control that it's not even worth putting 13psi of boost and ~320WHP to the rear tires? I haven't even disabled stability control since getting the new tires because I'm too scared to. The car has never gone out of control since getting new tires, the worst that's happened was seeing the bad boy light, which happens too frequently to ignore, but I'm afraid of the time when it does go out of control, because maybe it's not as easy to compensate for as summer tires are?
Bonus Round: I've read that the JB4 in map 5 (autotuning map) adapts to tires and driving conditions in a realtime manner. Do you think I would benefit from using map 5 with my new, apparently very high maintenance, tires?
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