Time to share a possible 8sp 'enhancement'.

[daviderle]

I have discovered a feature/bug in the 8sp transmission that does not appear to be present in the (pre MCE) ZF/6 speed implementation!

On the 8 speed while cruising along, change to sport (manualatic) mode and very, very briefly stomp on the accelartor (ideally for less than 300ms) and lift your feet, you note that the 3.5 inch cluster transmission indicator, will register an instant gear change to the correct low gear, during the initial stomp and then back to current gear without any reaction from the actual trasmission!!!

On the ZF, however, this condition does not seem to exist, you stomp on it and around 600ms later the correct gear is selected regardless how brief the stomp was!?

The good news is from what I tested, the 8sp is faster than the ZF (450ms vs 600ms in normal operation), however I think it is actually capable of more 'aggressive' gear changes!!!

Even better news, I think I may have found a way around the ECU programming as follows:

Change to sports mode, hold the stick in the down position (-) and then stomp on it, you should note a shorter wait than you do normally (280-320ms according to the two OBDII readings I have taken, although allot more runs are needed).

I have been testing this trick/fix for last few weeks...

One word of caution, do not stomp on it and remove your foot from the kick down immediately while holding the gear stick in the down position, as this may result in a very rough down/up shift (maybe that is why the engineers built the transmission delay?)!!

The process still requires more study, but this is what I have so far...

Please keep mind that it is possible that this 'condition' is only applicable to the R-Spec (although, I highly doubt it), so please feel free to share your findings should you decide to try this test/fix for the 8sp automatic...

---
Cut-Throat, as far as I know you are the only other member with the same two transmission models, that maybe able to assist in double checking my findings, so please anything you can do will be greatly appreciated....

 

[zielritter]

I have discovered a feature/bug in the 8sp transmission that does not appear to be present in the (pre MCE) ZF/6 speed implementation!

On the 8 speed while cruising along, change to sport (manualatic) mode and very, very briefly stomp on the accelartor (ideally for less than 300ms) and lift your feet, you note that the 3.5 inch cluster transmission indicator, will register an instant gear change to the correct low gear, during the initial stomp and then back to current gear without any reaction from the actual trasmission!!!

On the ZF, however, this condition does not seem to exist, you stomp on it and around 600ms later the correct gear is selected regardless how brief the stomp was!?

The good news is from what I tested, the 8sp is faster than the ZF (450ms vs 600ms in normal operation), however I think it is actually capable of more 'aggressive' gear changes!!!

Even better news, I think I may have found a way around the ECU programming as follows:

Change to sports mode, hold the stick in the down position (-) and then stomp on it, you should note a shorter wait than you do normally (280-320ms according to the two OBDII readings I have taken, although allot more runs are needed).

I have been testing this trick/fix for last few weeks...

One word of caution, do not stomp on it and remove your foot from the kick down immediately while holding the gear stick in the down position, as this may result in a very rough down/up shift (maybe that is why the engineers built the transmission delay?)!!

The process still requires more study, but this is what I have so far...

Please keep mind that it is possible that this 'condition' is only applicable to the R-Spec (although, I highly doubt it), so please feel free to share your findings should you decide to try this test/fix for the 8sp automatic...

---
Cut-Throat, as far as I know you are the only other member with the same two transmission models, that maybe able to assist in double checking my findings, so please anything you can do will be greatly appreciated....

Have you tried this from a dead stop? In other words, holding the lever in the "-" position and then going WOT from a dig? The biggest delay for me, even with my sprint booster installed, is the hesitation when putting the pedal to the ground and actually feeling all of the torque at the wheels. Note this is only from a dead stop. Rolling stop or highway produces NO lag at all for me.

You V8 guys have the fuse-pull ESC disable that doesn't work for us V6 people.

 

[daviderle]

Have you tried this from a dead stop? In other words, holding the lever in the "-" position and then going WOT from a dig? The biggest delay for me, even with my sprint booster installed, is the hesitation when putting the pedal to the ground and actually feeling all of the torque at the wheels. Note this is only from a dead stop. Rolling stop or highway produces NO lag at all for me.

You V8 guys have the fuse-pull ESC disable that doesn't work for us V6 people.

This fix/trick would be only applicable to downshifting using the kick down switch (Sorry)...

If there is any V6 owner around the ATL area who is willing to figure the V6 ESC if usable with me, I am willing to spend the time to look at this for you guys..

No promises, but using only an OBDII interface, it took me but an afternoon to figure the problem out back in early 2009 on the V8 and I am pretty sure I can do the same on the V6...

The alternative is for you to get OBDII reader and we do a 'virtual meet' using a Skype or face time and we can try to figure it out remotely,? Ideally one weekend after the festive season is behind us..

 

[Zappre]

Tried it last night and IT WORKS!! The gear jumps from 8 to 5 or 8 to 3 depending on what speed I'm at at the time. The car just seems to pick the most appropriate low gear and jumps straight to it. The truth is that I'd likely rarely use this because it's too much extra effort but every once in a while I probably would avail myself of it. It means the car does know what the right gear is, Hyundai just chose not to implement it in the programming. Great work! Nice find!

 

[Gunkk]

Anyone know the Max torque rating on the 8sp?

 

[sluggo]

Owner of a 2013 3.8 here. I tried this last night on my way home from work. I changed to manual shift mode and noted that I was in 8th gear at 30 mph. As a test, instead of pulling the shifter toward "-" (downshifting), I pushed it forward to "+" (upshifting) and held it there while I stabbed the throttle. The transmission instantly dropped into 3rd gear and the engine spun up (and I mean right away) to about 4000 rpm. Scared me how quickly this all happened.

So the trick works on the V6, and it works in the upshift direction as well. It doesn't seem to care what direction you intended the transmission to shift, it only seems to care about whether or not you're in the manual mode.

I'm a little worried that the transmission was effectively spinning up the engine. I know transmissions apply force to the engine whenever you take your foot off the gas, but this was pretty severe. I don't think I'll be doing this again until I understand it's affect on the torque converter.

 

[amartz]

Me, I've already had a tranmission replaced once. I'm not eager to do it again, even if it is still in the warranty period...

 

[daviderle]

With this find, I have so got to find a place that is willing to install the shifter kit that has been sitting on the shelf for months, or just find a free weekend and try to work on it myself...