Joshuam08 New Member 16 Member For: 6y 2m 5d Posted 21/10/18 11:23 PM Share Posted 21/10/18 11:23 PM Hey all, I've been noticing a few weird little things with my G6E Turbo and thought here would be a good place to ask about them. My G6E is currently tuned to 280rwkw, so not a lot of power extra but a bit. My ZF is tuned, however I noticed these issues before the tune. Basically, when I am driving in traffic without a lot of acceleration, shifting is perfect and almost unnoticeable. With WOT, shifting is also nice and smooth. The issue I'm having is when I'm on like 40-60% throttle (at a guess, basically putting my foot down a little bit but not hard), sometimes when the car goes to shift, the car jerks and there is a bit of a thunk feeling and it's not smooth at all. I guess it almost feels like the ZF goes to shift, doesn't find a gear straight away so the car looses some momentum, and then it slams into a gear and keeps going causing the jolt/clunk/shunt etc. Sometimes this is also accompanied by a "shift fart" which I don't usually get on shifts if that matters at all. It seems like it mostly occurs in 3rd to 4th shifts but can occur in other gears I believe. It also occurs when I shift manually. I wanted to see if this was a normal thing, or a common issue that I can get fixed? I found another thread where someone asked the same question but didn't get a response so I don't think I'm the only one. Thanks all! Link to comment Share on other sites More sharing options...
k31th less WHY; more WOT Site Developer 29,063 Member For: 16y 8m 17d Gender: Male Location: Melbourne Posted 22/10/18 12:25 AM Share Posted 22/10/18 12:25 AM well, the "shift fart" you reference, is the torque reduction in the gearbox tune, which could definitely cause the symptoms of "momentum loss" you describe. Link to comment Share on other sites More sharing options...
Joshuam08 New Member 16 Member For: 6y 2m 5d Posted 22/10/18 01:34 AM Author Share Posted 22/10/18 01:34 AM (edited) I used to have the torque reduction as part of the gearbox tune, so I know what that feels like (and loved it). While it does have a little bit of a fart, the jolt I'm feeling isn't the same as what is usually felt by the torque reduction. This one feels a lot more violent and shakes the car a bit. Edited 22/10/18 01:34 AM by Joshuam08 Link to comment Share on other sites More sharing options...
k31th less WHY; more WOT Site Developer 29,063 Member For: 16y 8m 17d Gender: Male Location: Melbourne Posted 22/10/18 02:28 AM Share Posted 22/10/18 02:28 AM could be a tailshaft centre bearing or rear bushes issue, too, as the lash in the driveline (and associated mounts) can cause issues like this. Link to comment Share on other sites More sharing options...
Joshuam08 New Member 16 Member For: 6y 2m 5d Posted 22/10/18 03:32 AM Author Share Posted 22/10/18 03:32 AM (edited) It's going in for a ZF service soon so I'll get them to take a look at that. I'm also just a bit confused why there is no issue with minor throttle or WOT, and only when in the middle. Thanks for the help mate. Only other thing I thought I'd ask, I did have the shift fart and loved the sound, and I don't have it now. Is there any reason to have shift farts/no shifts farts etc? I think the tuner told me they found that firm shifts prolonged the box but curious if there is a negative to going back to torque reduction being enabled. Edited 22/10/18 03:35 AM by Joshuam08 Link to comment Share on other sites More sharing options...
k31th less WHY; more WOT Site Developer 29,063 Member For: 16y 8m 17d Gender: Male Location: Melbourne Posted 22/10/18 03:35 AM Share Posted 22/10/18 03:35 AM Yeah, you can tell your gearbox tuner to put the fart back in, if you want it... but like he said, the firmer shifts can prolong the box's life at high power levels... 280rwkw is fine to have the torque reduction remain in the tune. no worries, happy to help Link to comment Share on other sites More sharing options...
Puffwagon Puff Gold Donating Members 15,993 Member For: 9y 10m 28d Gender: Male Location: South Australia Posted 22/10/18 04:20 AM Share Posted 22/10/18 04:20 AM The engine and the trans have to be tuned to compliment each other which is why a generic zf tune is not a great idea. Watching some of the hoontune tuned cars you can see that there is a decent wait while the trans makes the shift in some of them. You can clearly hear a shift fart in a car that ran 9.30 @ 154mph. Link to comment Share on other sites More sharing options...
Joshuam08 New Member 16 Member For: 6y 2m 5d Posted 22/10/18 04:48 AM Author Share Posted 22/10/18 04:48 AM It wasn't a generic tune (it was tuned with the engine at the same time), and it also had the same issue prior to being tuned. Unless I'm misinterpreting what you mean by generic. I was hoping a tune would've fixed it but sadly not so I'm just trying to work out what else would be the cause as I'm pretty sure the ZF and engine are in some kind of harmony. It's just confusing the issue doesn't seem to occur in WOT. Link to comment Share on other sites More sharing options...
Puffwagon Puff Gold Donating Members 15,993 Member For: 9y 10m 28d Gender: Male Location: South Australia Posted 22/10/18 04:59 AM Share Posted 22/10/18 04:59 AM Just now, Joshuam08 said: It wasn't a generic tune I didn't mean yours was, I was just making a point that they need to be done together. From your first post it seems that it is shifting with the converter locked, possibly with some other funny stuff going on. Your tuner should be able to fix this if it is the case. As it was there before it might not be able to be fixed with a tune and it could need opening up and inspecting. How are your coils? They can cause transmission dramas. Link to comment Share on other sites More sharing options...
adams355 Member 529 Member For: 7y 7m 26d Gender: Male Location: Brisbane Posted 22/10/18 05:30 AM Share Posted 22/10/18 05:30 AM how long since its last service 1 Link to comment Share on other sites More sharing options...
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