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You are most definitely not going to solve your transmission overheating problem by adding boost so you can have more HP at lower RPM. If you tow a 3800lb car with a 1,500+lb trailer you are right at the limit of the 3.0 auto's towing capacity (5,500lbs). It's far more likely that your transmission is in need of maintenance or at best an external cooler. Then you could just use the throttle normally in your current motor instead of adding horsepower so you can overheat your transmission even more by transmitting more horsepower (and thus more heat) through it. |
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As for diesels, well, the thing about them is that they HAVE to be force fed to make enough power to perform well. And they are built from the factory to withstand all that. Also, my diesel truck has a transmission cooler and a trans temp gauge from the factory because, well, they still overheat. |
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So it sounds like there are a few deterents on increasing power output on the E53 3.0, but no one has really tried? Surprising to me since the BMW inline 6's of this era are pretty impressive, which I can't say the same for the V8's they made which ESS and dinan made supercharge kits for.
Upgrading the trans cooler will solve the overheating issue, which is fine, but anyone who has towed the max rated load with the 3.0 probably can share my experience with it needing a bit more power. |
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I still think that a well maintained N62 is a much better option that'll give you more of what you want and cost a lot less to get there. And the ZF 6-speed auto kicks the shit out of the GM box that all 3.0i automatics got. If you said to me "I want a manual X5 and I want to tow with it," then figuring out ways to add power to the 3.0i would be one thing. (And I have towed with my 6MT X5.) But I wouldn't let your bad experience with what has to be the least reliable E53 in existence rule out the V8s completely. |
I also tow a camper trailer regularly with my 3.0i/5MT X5. I weighed the trailer last year on a trip home, and it ends up around 4,000-4,500lbs, with a gross vehicle weight of over 9,000lbs fully loaded. So my X5 with trailer is probably slightly lighter than your X5 with trailer, but has a lot more aerodynamic drag on the highway, being a short but full-width and full-height trailer.
Of course with the 3.0 it takes a lot of effort to maintain speed while climbing hills, but I am able to maintain speed on the highway without downshifting. Especially at sea level I don't have any trouble on the highway in 5th gear unless I am trying to go 75mph or there is a serious headwind. (I live at 4,000ft and there's a noticeable difference at my elevation, but still it is possible.) Granted I do not own the automatic trans, but based on this experience I would assume something is wrong with your transmission if it is overheating just trying to maintain speed on the highway with your trailer. (On a further note: I climb a mountain pass with my fully loaded trailer at least once every year, going up to about 5,500 feet on steep grades in the middle of the summer. These trips always have multiple climbs where I am spending 10 or more minutes at WOT, usually switching between third and fourth gear, at 95+ degrees outside, and I have never had a problem. I'd challenge anybody to think up a scenario that's tougher on a motor/transmission combination than spending ten straight minutes at WOT in between 4,500-6,000 rpm!) |
Actually it's the opposite, increased RPM gets rid of heat faster, especially apparent on a diesel. Typical "I tow a race car" thinking.
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