E70 X5 diesel acceleration issues.

[Jelabri]

Hello my fellow bimmer friends. I have an E70 X5 35d and I am having issues with acceleration. When I'm at a light and push on the gas pedal the car takes a second for it to react. It almost feels like it's slipping a bit then it catches then I can feel the power. I mean my accel is worse than a 1999 Toyota Camry. Probably good to mention it has a Dinan Stage 3 tune with a custom cold air intake. It is not EGR/SCR/DPF/DEF deleted though. This frustrates me as it's super fast when any other time but when it's from a stop it lacks ALOT. It has almost gotten me in accident from merging onto a road and pushing the gas and the thing takes a second to go then all of a sudden it's FULL BOOST. Any help would be appreciated.

[T-Dubbs]

LOL

By the sounds of your power situation (the only non-deleted DINAN stage3 M57 in existence) it must be your transmission slipping.

[Jelabri]

Originally Posted by T-Dubbs

LOL

By the sounds of your power situation (the only non-deleted DINAN stage3 M57 in existence) it must be your transmission slipping.

Should I remove the tune until it's deleted? My buddy installed it as a surprise because he bought an X5 then sold it a week later. What can I do about my transmission slipping?

[conmar]

Reminds me of the issues I had with my former diesel Saab (also tuned), could solve it with a transmission flush.
If not available at your area, at least have the oil changed.
Should the slipping continue you may as a last resort go for a revision of the automatic gear.
Honestly I do not see any relation to the tune, but others may have better insight re dinan.

[Jelabri]

Originally Posted by conmar

Reminds me of the issues I had with my former diesel Saab (also tuned), could solve it with a transmission flush.
If not available at your area, at least have the oil changed.
Should the slipping continue you may as a last resort go for a revision of the automatic gear.
Honestly I do not see any relation to the tune, but others may have better insight re dinan.

Interesting. Thanks for your reply! A lot of people and the dealer ship do not recommend doing the transmission oil on these bmw since bmw said it's "life time" so the oil never got changed, so doing it now would cause a lot of damage according to people. Im going to my buddies today to get him to check the values on it.

[conmar]

Originally Posted by Jelabri

Interesting. Thanks for your reply! A lot of people and the dealer ship do not recommend doing the transmission oil on these bmw since bmw said it's "life time" so the oil never got changed, so doing it now would cause a lot of damage according to people. Im going to my buddies today to get him to check the values on it.

You're welcome mate!
To be sure to really change all of the old oil and get ridd of residues have a transmission flush done, google e.g. for Tim Eckart method or Transmission flush Tim Eckart, to give you the idea, or have the oil changed twice, with a couple of hundred miles in between.
And forget all b.s. about lifetime oil/fillings whatsoever, it is merely marketing ballyhoo, to put it in nice words.
My ride is a 40d from 2010, currently at around 162.000 miles, the previous owner had the transmission oil changed at 118.000 miles, and I intend to have it flushed at 240.000 at the latest, earlier if need should be.

[Jelabri]

Originally Posted by conmar

You're welcome mate!
To be sure to really change all of the old oil and get ridd of residues have a transmission flush done, google e.g. for Tim Eckart method or Transmission flush Tim Eckart, to give you the idea, or have the oil changed twice, with a couple of hundred miles in between.
And forget all b.s. about lifetime oil/fillings whatsoever, it is merely marketing ballyhoo, to put it in nice words.
My ride is a 40d from 2010, currently at around 162.000 miles, the previous owner had the transmission oil changed at 118.000 miles, and I intend to have it flushed at 240.000 at the latest, earlier if need should be.

I will look into that! I'm just scared to touch the trans because so many people advise me otherwise. I'm the second owner of my 35d and have all the maintenance records and it's never been done before. I'm sitting at 189,000kms

[T-Dubbs]

If you have no maintenance records, I would start there.
Do the fluids/filters and have a good tech go through it for any missed maintenance items.

Mine is at 185kms and runs better than it did when I got it at 125kms.

where are you located in Canada?

[Jelabri]

Originally Posted by T-Dubbs

If you have no maintenance records, I would start there.
Do the fluids/filters and have a good tech go through it for any missed maintenance items.

Mine is at 185kms and runs better than it did when I got it at 125kms.

where are you located in Canada?

I have all the maintenance records for my X5. And I'm in Calgary AB. That's probably a good idea to get it checked out either way to make sure everything's in line. The issue I mentioned was not happening when I first bought it. Would u recommend transmission service?

[T-Dubbs]

Originally Posted by Jelabri

I have all the maintenance records for my X5. And I'm in Calgary AB. That's probably a good idea to get it checked out either way to make sure everything's in line. The issue I mentioned was not happening when I first bought it. Would u recommend transmission service?

Yes, but the fluid may not fix it if there is a bigger issue on the table.

Mine has been serviced in Calgary by Vex Performance ( Jimmy Bailey) or at
LS Motorwerks (Sebastian Prucnal).

Either one of those shops can point you in the right direction. Vex does alot of bmw diesel stuff, they tuned my x5 (DUDMD software).

[Jelabri]

Originally Posted by T-Dubbs

Yes, but the fluid may not fix it if there is a bigger issue on the table.

Mine has been serviced in Calgary by Vex Performance ( Jimmy Bailey) or at
LS Motorwerks (Sebastian Prucnal).

Either one of those shops can point you in the right direction. Vex does alot of bmw diesel stuff, they tuned my x5 (DUDMD software).

I went to my friends house yesterday and He checked the values on my transmission and everything looks great. Funny enough it was jimmy who does his tuning for his X5 diesel. He drove it as well and said That they are supposed to slip in first due to higher amounts of torque and that his X5 does the same thing.

[Jelabri]

Originally Posted by T-Dubbs

Yes, but the fluid may not fix it if there is a bigger issue on the table.

Mine has been serviced in Calgary by Vex Performance ( Jimmy Bailey) or at
LS Motorwerks (Sebastian Prucnal).

Either one of those shops can point you in the right direction. Vex does alot of bmw diesel stuff, they tuned my x5 (DUDMD software).

Also how much did a delete cost you? Only reason I haven't yet is because it's a hefty $4k after parts, tuning and labour

[sunny_j]

Originally Posted by Jelabri

I went to my friends house yesterday and He checked the values on my transmission and everything looks great. Funny enough it was jimmy who does his tuning for his X5 diesel. He drove it as well and said That they are supposed to slip in first due to higher amounts of torque and that his X5 does the same thing.

this is 100% false. the trans in my X5d with 185km has never slipped!

[conmar]

Originally Posted by sunny_j

this is 100% false. the trans in my X5d with 185km has never slipped!

Second this, nor did mine with 261.000 km.

[conmar]

Originally Posted by Jelabri

I went to my friends house yesterday and He checked the values on my transmission and everything looks great. Funny enough it was jimmy who does his tuning for his X5 diesel. He drove it as well and said That they are supposed to slip in first due to higher amounts of torque and that his X5 does the same thing.

I understand you are scared to touch the transmission, but to believe this explanation is, well, not the best way to proceed, sorry.
How about contacting ZF, the manufacturer of the transmission and get some insight re transmission oil change from them? In Europe they do offer this service for private customers too.
Used to live in Manitoba and Bring Cash a couple of years ago, afair ZF is located in Ontario, you could give them at least a call for your peace of mind.

Another thought: how much torque does your car have now and how much torque can your tranny handle? Should this really be the behaviour to be expected, I would start to worry.

[Jelabri]

Originally Posted by conmar

I understand you are scared to touch the transmission, but to believe this explanation is, well, not the best way to proceed, sorry.
How about contacting ZF, the manufacturer of the transmission and get some insight re transmission oil change from them? In Europe they do offer this service for private customers too.
Used to live in Manitoba and Bring Cash a couple of years ago, afair ZF is located in Ontario, you could give them at least a call for your peace of mind.

Another thought: how much torque does your car have now and how much torque can your tranny handle? Should this really be the behaviour to be expected, I would start to worry.

I just contracted ZF via Email. Let's hope for a timely reply. On the other note I have 572 ft-lbs of torque. What boggles me is that these transmissions are known to handle torque in the ball park of the 900-1000 stock.

[RL18]

Originally Posted by Jelabri

Hello my fellow bimmer friends. I have an E70 X5 35d and I am having issues with acceleration. When I'm at a light and push on the gas pedal the car takes a second for it to react. It almost feels like it's slipping a bit then it catches then I can feel the power. I mean my accel is worse than a 1999 Toyota Camry. Probably good to mention it has a Dinan Stage 3 tune with a custom cold air intake. It is not EGR/SCR/DPF/DEF deleted though. This frustrates me as it's super fast when any other time but when it's from a stop it lacks ALOT. It has almost gotten me in accident from merging onto a road and pushing the gas and the thing takes a second to go then all of a sudden it's FULL BOOST. Any help would be appreciated.

Probably an injector issue if you're having an initial hesitation on acceleration. Could also be a vacuum system leak. The trans *shouldnt* slip when you first accelerate but the torque converter will take awhile to lock up completely, so it'll free rev and eventually drop rpms, lock up and pull. I can't remember what it felt like stock tbh. If you think it's the trans you should try the xhp trans tune or sutphin trans tune. The stock tuning SUCKS. Both my x5d and 335d had the xhp stage 3 immediately. I also drive in m-mode with it starting in 2nd gear.
But my guess would be injectors

[Jelabri]

Originally Posted by RL18

Probably an injector issue if you're having an initial hesitation on acceleration. Could also be a vacuum system leak. The trans *shouldnt* slip when you first accelerate but the torque converter will take awhile to lock up completely, so it'll free rev and eventually drop rpms, lock up and pull. I can't remember what it felt like stock tbh. If you think it's the trans you should try the xhp trans tune or sutphin trans tune. The stock tuning SUCKS. Both my x5d and 335d had the xhp stage 3 immediately. I also drive in m-mode with it starting in 2nd gear.
But my guess would be injectors

Thanks for your help! When my friend took it for a drive he said my Injectors sound tiered. So maybe that's my culprit. We checked values on the transmission and everything's working perfect. He also suggested a transmission tune because he said the same thing. It sucks from factory.

[RL18]

Originally Posted by Jelabri

Thanks for your help! When my friend took it for a drive he said my Injectors sound tiered. So maybe that's my culprit. We checked values on the transmission and everything's working perfect. He also suggested a transmission tune because he said the same thing. It sucks from factory.

No problem. You could start by trying an additive at every fill up to see if that helps clean the injectors. Me personally I run a mixture of optilube xpd and optilube boost, then in winter (live in Maine) mix in optilube winter blend too. Most additives don't do shit but this one seems to actually do what it says. I know that because I use to have an old 7.3 powerstroke and that stuff literally saved me in the winter with 10 F below start ups and cleaning the stock injectors in a +200k mileage truck. I went through 2 other additives brands before I found that stuff that didn't do shit. And not only that but also fixed an injector issue I had in my 335d where the idle would jump a little bit on cold starts when I first bought it at 89k.
The fuel in the US is terrible quality, not very well lubricated, they don't seem to put additives to help with fuel gelling, plus the minimum cetane rating is something like 41 (bmw actually calls for a cetane rating of like 52 on the m57, I might be off a point maybe someone will correct me). This is also the reason the newer n57 cp4 are having so many issues grenading, which is also in newer diesel pickups.
It sucks to have to spend the extra money on shit like that with these ridiculous fuel prices, but also cheaper insurance than having to replaced injectors/fuel system parts because of shitty fuel quality.

[wcs531]

Additional possibilities:

Boost leak that turbo is able to overcome at higher rpm?

Turbo changeover valve issue (someone said vacuum leak above which could cause this - also other possible causes in this thread:
https://www.e90post.com/forums/showthread.php?t=1268209)