[TheCoolX3]

A few weeks ago I posted about a whirling noise coming from my trans. Took it to BMW and the claim not to be able to replicate it. Since then I've noticed what seems to be the trans slipping but only under light throttle. Above 3k in all gears under light to a low medium throttle the car will shake and sounds like what I believe to be the trans slipping.

Now for the part that mind f*cks me.. Under full throttle it shifts perfectly. Did a 1st-8th WOT pull and shifted perfectly. The other day I did about 8 'Diagnostic' launch control launches from a dig and had no issues with shifts. Also, the Zf trans' are built pretty good and theres no way my X3 is close to making X5M power... Yet

Scanned the car and the only codes that came up will be attached in the picture.

Only thing I could think of is something to do with my wastegate. Under light throttle is when it acts strange. Perhaps this foolery is confusing the trans and causing it to slip?

I've tried to fix the wastegate but I fear I will not be able to get the vacuum line back on the the actuator and don't want to risk it. Car is going into the dealer on the first.

[________]

How many miles? It may be due an oil change. The transfer case acting up could also be a factor.

And the X3 does not share a transmission with an X5M, so you shouldn't base it on other vehicles.

[scostu]

https://bmwtechnician.com/2016/06/26...transfer-case/

[TheCoolX3]

Hm.. I've been told that they both have the same zf 8 I must be misinformed.

44k miles and never had a transfer case problem, never had trans fluid change. Car does not give the normal shaking and shuttering when turning and like I said, I did some diagnostic launches and the car was fine. I think both of those would rule out the TC

Originally Posted by OnerDriver

How many miles? It may be due an oil change. The transfer case acting up could also be a factor.

And the X3 does not share a transmission with an X5M, so you shouldn't base it on other vehicles.

[________]

Originally Posted by TheCoolX3

Hm.. I've been told that they both have the same zf 8 I must be misinformed.

44k miles and never had a transfer case problem, never had trans fluid change. Car does not give the normal shaking and shuttering when turning and like I said, I did some diagnostic launches and the car was fine. I think both of those would rule out the TC

Yeah they told you wrong.
But your car is very low miles, not within the recommended range for oil change.

I noticed your car is tuned, could it be a misfire?

[TheCoolX3]

I suppose it could be a misfire but if you were riding in the car it’s most apparent that it would be trans related given the nosies the car makes and shaking. I will get a log to check for misfires. Wouldn’t when i scanned the car I’d get a DTC from a misfire?

I did digging into my misinformation and you’re correct! But I now present you..... the M760I! my x3 is far from that V12 powar....for now

Originally Posted by OnerDriver

Yeah they told you wrong.
But your car is very low miles, not within the recommended range for oil change.

I noticed your car is tuned, could it be a misfire?

[________]

Originally Posted by TheCoolX3

I suppose it could be a misfire but if you were riding in the car it’s most apparent that it would be trans related given the nosies the car makes and shaking. I will get a log to check for misfires. Wouldn’t when i scanned the car I’d get a DTC from a misfire?

Do you have a video showing the tachometer while driving? Would be ideal to see the behaviour and noise.

[TheCoolX3]

I will get one as soon as possible.

Originally Posted by OnerDriver

Do you have a video showing the tachometer while driving? Would be ideal to see the behaviour and noise.

[________]

Originally Posted by TheCoolX3

I did digging into my misinformation and you're correct! But I now present you..... the M760I! my x3 is far from that V12 powar....for now

Where did you get that info?
AFAIK the 7 series shares gearbox with the X5M, therefore still no lol

[TheCoolX3]

Okay I give up on the comparisons. Fuggin Wikipedia failing me again.

Originally Posted by OnerDriver

Where did you get that info?
AFAIK the 7 series shares gearbox with the X5M, therefore still no lol

[________]

Originally Posted by TheCoolX3

Okay I give up on the comparisons. Fuggin Wikipedia failing me again.

Hahaha it's ok.

But to be sure, the X3 uses the 8HP45, for a maximum of 450 Nm.

These cars you're quoting use the 8HP75, for 750 Nm.

What's important to know, other than which cars use which, is if your engine develops more or less than the nominal torque figures they're designed to withstand.

[TheCoolX3]

Thank you for the info! Glad my trans will hold up. Ill get that video of the dash today or tomorrow.

Originally Posted by OnerDriver

Hahaha it's ok.

But to be sure, the X3 uses the 8HP45, for a maximum of 450 Nm.

These cars you're quoting use the 8HP75, for 750 Nm.

What's important to know, other than which cars use which, is if your engine develops more or less than the nominal torque figures they're designed to withstand.