Also posted on the other forum...got no response. Guess those guys don't actually drive theirs
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Took my car out for some serious exercise for the first time since I put these tires on. I already knew the new tires really hook up in a straight line, but I did not know how they'd perform in the twisties. As it turns out, the car sticks extremely well and the tires have that planted DOT race rubber feel.
However, my AH (had it in comp mode) was kicking in A LOT ( 60% + of the curves I took). I leave it on because I don't want to plunge 1000 feet over a cliff due to an error, but it rarely came on with the F1 SCs, and when it did, I knew I had screwed up.
Here, the car seems to behave normally and it still kicks in. Unlike before, it's effect is not noticeable - I would not even know it intervened were it not for the DIC telling me so. Anyone else have this issue with the Nittos?
I will add for full disclosure that I installed a Sparco race seat and it was the first time for that too. Could I be more into the limits of the car and not noticing because of the seat? (since I am no longer flopping over)
Hmmmm. That's wierd. I would think the AH would kick in less often running R2s over F1s. Mine will only kick in if the car gets out of shape a bit, starts to rotate a bit which as you know, doesnt happen too easily on R2s in a corner unless you are intentionally really trying to really get the tail out. Are you sliding at all in the corners ? My AH does come on easily in the wet, or on a cold road with cold tires. But it shouldnt come if you have the grip you say, and the car keeping a line. Whatever you do, I would NOT recommend switching the AH off.
Glad you like the R2s - I too really enjoy how much they've inproved cornering stick - no comparision. Anything I have in the car that is not stuck down goes flying when I hit a corner (CD's, wallet, phone, etc) including me, I sure could use a better seat...
Maybe some of the other guys who have our tires or the experienced road race guys will have some insight as to why your AH is being so obtrusive.
The active handling is programmed with algorithms that are optimized for the stock F1 tires handling characteristics...By switching to the Nittos you effectively change how the pcm interprets what the car is actually doing...
Ex: With the stock F1's, as you approach the handling limits of the tires, to me at least, it seems that they begin to let go nice and gradual like...In doing this, the pcm rarely senses irratic or unusual attitude changes of the car...
But with the Nittos, I would bet that they grip tons better than the F1's...But, as most hi performance tires like that, the draw backs are when they let go, they usually do so without warning and in a much more pronounced way...The pcm could interpret these motions, as being at the edge of handling and in turn, attempt to make adjustments...
I thought about the algorithms, but I never had these issues with AH on the prior car (a 200 Coupe) even when running V700 Victoracers (275 front and 315 rear on 17s) at track events.
Now What, I am not sliding in the corners. In fact, I am not even driving 9/10ths (more like 7/10ths), so this surprised me. That is what is odd. Normally, when AH intervenes, I know it without even looking at the DIC, and it ususally corresponds with me clearly screwing up and overcooking a turn, or doing some bonehead steering or throttle input . Here, the message just keeps appearing even though I can discern no real effect.
It's my understanding that it tales a few sessions for the AH to learn about new tires. I have heard that even putting a new set of GY F1 SCs requires a few driving sessions for the AH to get dialed in.
Hopefully after a few more drives your AH will learn the Nittos.
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'04 MS/Blk - Z06Fest IV, V, VI & VII - WinterFest I "Bus Driver"
I do not think tires are the issue.
A/H compares intended path with actual path.
A/H does not know when your tires will lose grip (wet or dry).
I dont know what is wrong here but it is possible that you have an A/H sensor issue.
I run all Nitto R2's and have noticed less AH use then before. AH should only kick in if the tires loose traction, softer tires should loose traction less often.
The computer shouldn't care about the type of tread compound. That only affects "clamp down" factor. AH should only be kicking in if the car path is significantly different from the intended path.
Remember tire grip is a completely dynamic algorithm. It's completely relevant to the surface you are traveling across. A set of Nitto’s on ICE is not going to grip as well as a set of F1's on dry pavement. The computer must adjust based on slippage, not perceived traction.
I would bet your problem is more based on the new – larger tires. Perhaps they incorrectly balanced one tire, or maybe the alignment changed with the diameter change. My Nitto’s did not cause any of the problems you are seeing.
This past Sunday was my 4th track event on the RII's and AH kicked in ALOT, whereas it didn't in the past 3. I also noticed ABS kicking in alot more. I attributed this to the tires being on their way out as far as heat cycles even though there is still plenty of tread left on them. Strange that this is happening to you the first time you really pushed them. What pressures are you running? I've found 31f/30r cold to be best.
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