2017 B-Street discussion...
#93
Evolved Member
iTrader: (29)
http://www.motec.com/filedownload.ph...pdf?docid=4399
#94
EvoM Guru
iTrader: (1)
Well, considering I'm pretty good with trail braking, it would make sense that my car seemed to push all the time without the ACD functioning.
#95
Evolved Member
Thread Starter
What is more likely is push will be driver induced by getting into the corner too fast/braking too late and asking too much of the outside front tire.
So, all of this AWD system control stuff has to work with the driver for it to do the right thing. If driver is making mistakes, system can compensate it only so much. I do believe that it is much more important to drive the given car the right way and than see what else control system can help with it. I don't believe that going to other way will reach as far as people would like it to go!
#97
EvoM Guru
iTrader: (1)
This bolded part doesn't make much sense at all to me! With ACD not working all of the diffs are pretty much running in an open mode, so any power application that would make car to push would most likely send power to the inside wheels that have lower amount of grip (compared to the outside ones). Limited power on those wheels (due to wheel spin) will not create much of tendency to push (especially in the front, a bit more so in the rear, which stops the car from rotating a bit).
What is more likely is push will be driver induced by getting into the corner too fast/braking too late and asking too much of the outside front tire.
So, all of this AWD system control stuff has to work with the driver for it to do the right thing. If driver is making mistakes, system can compensate it only so much. I do believe that it is much more important to drive the given car the right way and than see what else control system can help with it. I don't believe that going to other way will reach as far as people would like it to go!
What is more likely is push will be driver induced by getting into the corner too fast/braking too late and asking too much of the outside front tire.
So, all of this AWD system control stuff has to work with the driver for it to do the right thing. If driver is making mistakes, system can compensate it only so much. I do believe that it is much more important to drive the given car the right way and than see what else control system can help with it. I don't believe that going to other way will reach as far as people would like it to go!
If the ACD fails, you have to driver the car differently. You go into a corner at 130mph, and that system isn't functioning when you're expecting it to, it's a significant surprise. The attitude of the car on the breaks is different, turn in is different, and when you get on the throttle on exit, power doesn't go to the rear tires as expected. You can't call it a "driver issue" when the car goes from having an active center diff, to an open center diff and major handling deficiencies arise. The chassis is tuned around that center diff working. All of a sudden it's an open diff (not even a VCU, just straight open), and everything changes.
I have an 8, with mechanical front and rear diffs. A wavetrac front diff, and TRE maxlok rear diff. There was no unloading power to the inside tires. So only the ACD stops working when the ACD fails, I don't have AYC.
#98
Evolved Member
Thread Starter
Yeah totally a driver issue.
If the ACD fails, you have to driver the car differently. You go into a corner at 130mph, and that system isn't functioning when you're expecting it to, it's a significant surprise. The attitude of the car on the breaks is different, turn in is different, and when you get on the throttle on exit, power doesn't go to the rear tires as expected. You can't call it a "driver issue" when the car goes from having an active center diff, to an open center diff and major handling deficiencies arise. The chassis is tuned around that center diff working. All of a sudden it's an open diff (not even a VCU, just straight open), and everything changes.
If the ACD fails, you have to driver the car differently. You go into a corner at 130mph, and that system isn't functioning when you're expecting it to, it's a significant surprise. The attitude of the car on the breaks is different, turn in is different, and when you get on the throttle on exit, power doesn't go to the rear tires as expected. You can't call it a "driver issue" when the car goes from having an active center diff, to an open center diff and major handling deficiencies arise. The chassis is tuned around that center diff working. All of a sudden it's an open diff (not even a VCU, just straight open), and everything changes.
Either way, this is pretty complicated subject and without knowing all particular details about the given car, all of it is just guestimate at best. I though we were talking about the stock diffs (and in particular, stock EVO X, because article Sam brought was pointing to it).
#99
Evolved Member
Thread Starter
So, my ACD pump noise issues are finally over! Mitsu gave me another pump and ever since it was installed, the noise is gone! Lets hope that this one will last a bit longer, since this is the pump v4.0 on this car.
Racing this sunday, but I am going to slow things down a bit and race in HS instead! Kind of more appropriate with my age! Car is FiST and owner is a fast guy, so it will be nice to see how I am going to fair with FWD that I have never raced at autoX before!! Either way, I am pretty excited about this! More on it after event! Happy 4th guys!
Racing this sunday, but I am going to slow things down a bit and race in HS instead! Kind of more appropriate with my age! Car is FiST and owner is a fast guy, so it will be nice to see how I am going to fair with FWD that I have never raced at autoX before!! Either way, I am pretty excited about this! More on it after event! Happy 4th guys!
#100
Evolved Member
iTrader: (29)
This bolded part doesn't make much sense at all to me! With ACD not working all of the diffs are pretty much running in an open mode, so any power application that would make car to push would most likely send power to the inside wheels that have lower amount of grip (compared to the outside ones). Limited power on those wheels (due to wheel spin) will not create much of tendency to push (especially in the front, a bit more so in the rear, which stops the car from rotating a bit).
What is more likely is push will be driver induced by getting into the corner too fast/braking too late and asking too much of the outside front tire.
So, all of this AWD system control stuff has to work with the driver for it to do the right thing. If driver is making mistakes, system can compensate it only so much. I do believe that it is much more important to drive the given car the right way and than see what else control system can help with it. I don't believe that going to other way will reach as far as people would like it to go!
What is more likely is push will be driver induced by getting into the corner too fast/braking too late and asking too much of the outside front tire.
So, all of this AWD system control stuff has to work with the driver for it to do the right thing. If driver is making mistakes, system can compensate it only so much. I do believe that it is much more important to drive the given car the right way and than see what else control system can help with it. I don't believe that going to other way will reach as far as people would like it to go!
So, my ACD pump noise issues are finally over! Mitsu gave me another pump and ever since it was installed, the noise is gone! Lets hope that this one will last a bit longer, since this is the pump v4.0 on this car.
Racing this sunday, but I am going to slow things down a bit and race in HS instead! Kind of more appropriate with my age! Car is FiST and owner is a fast guy, so it will be nice to see how I am going to fair with FWD that I have never raced at autoX before!! Either way, I am pretty excited about this! More on it after event! Happy 4th guys!
Racing this sunday, but I am going to slow things down a bit and race in HS instead! Kind of more appropriate with my age! Car is FiST and owner is a fast guy, so it will be nice to see how I am going to fair with FWD that I have never raced at autoX before!! Either way, I am pretty excited about this! More on it after event! Happy 4th guys!
#101
Evolved Member
Thread Starter
Thanks! It was a relief for sure!
#103
Last Sunday was my second event with the new shocks and alignment, and I'm really beginning to like the new setup now. I placed 2nd in my class narrowly losing to a S2K by 0.024 sec . Pax was 8/87. My other runs indicate that my 'perfect' run would have been at least half a second quicker, which would have placed me third in pax.
Revalved Bilsteins and rear toe-in definitely made the car much easier to drive, especially in slaloms. Now I can really throw it around without fearing about it spinning out of control. Corner exit doesn't seem affected. Maybe the AYC just works harder and compensates for it? In any case, it's a win-win .
Results here.
Revalved Bilsteins and rear toe-in definitely made the car much easier to drive, especially in slaloms. Now I can really throw it around without fearing about it spinning out of control. Corner exit doesn't seem affected. Maybe the AYC just works harder and compensates for it? In any case, it's a win-win .
Results here.
#104
Evolved Member
iTrader: (29)
Last Sunday was my second event with the new shocks and alignment, and I'm really beginning to like the new setup now. I placed 2nd in my class narrowly losing to a S2K by 0.024 sec . Pax was 8/87. My other runs indicate that my 'perfect' run would have been at least half a second quicker, which would have placed me third in pax.
Revalved Bilsteins and rear toe-in definitely made the car much easier to drive, especially in slaloms. Now I can really throw it around without fearing about it spinning out of control. Corner exit doesn't seem affected. Maybe the AYC just works harder and compensates for it? In any case, it's a win-win .
Results here.
https://www.youtube.com/watch?v=PObpJzwxiOE
Revalved Bilsteins and rear toe-in definitely made the car much easier to drive, especially in slaloms. Now I can really throw it around without fearing about it spinning out of control. Corner exit doesn't seem affected. Maybe the AYC just works harder and compensates for it? In any case, it's a win-win .
Results here.
https://www.youtube.com/watch?v=PObpJzwxiOE
#105
Evolved Member
Thread Starter