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#1
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M62TUB44 vs M62B46 - interchangeable?
I did some google search and searched this forum as well as some others, did not get a definite answer to my question... I presently have an 2002 E53 X5 4.6iS that needs engine work, and sourcing parts is a financial nightmare, and considering a replacement M62B46 is equally nightmarrish... However, I have seen plenty of M62B44 and M62TUB44 floating around at rather affordable rates... Besides the obvious of demoting of the beast to the regular level, is it possible to drop an M62TUB44 in place of the M62B46 engine? If it is possible, what is involved in making sure it is working properly? Will the ECU and the rest of the brains communicate as it is, or some reprogramming must be done? are there incompatible parts? It will not be a DIY project, a professional mechanic will do the work but I wanted to be on the knowlegable side of the issue. I know that some people pull I-6 in favor of V8s in some racing applications, thus "upgrading" the car - I just want to get the thing back on the road... This plea is out of desperation, as my wife wants a divorce from the 4.6is and I hope to save the car's dignity instead of abandoning it somewhere under a bridge on an interstate!!!
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E53 X5 4.6iS 147K mi - Sold May 2013 Tireprints left in: USA, Nicaragua, Costa Rica, Panama, Russia E53 X5 4.8iS built 2005-10-17 66200 mi - June 2012 96000 mi - June 2013 112000 mi - June 2014 OEM fire extinguisher OE first aid kit OE tow hitch OE TV module OE aspheric mirror K&N air filter black/white badges rear camera 4-channel video recorder Here is the list of things I have done to the X |
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#2
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Quote:
While his upgrade was the opposite direction and on a different chassis, it can be reasonably assured that the challenges would be very similar.
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#3
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What's up with your 4.6 motor?
I would think the block and most of the accessories would be nearly identical on both motors, the tune would be different though. Depending on what kind of parts you need, maybe there is something aftermarket available? ie; pistons, rods, valvetrain
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2002 X5 4.6is - Titanium Silver / Black Alcantara - Dinan Stage 2 - Bilstein/Eibach - Brembo BBK ----SOLD--- 1993 318i - Brilliantrot / Tan - bone stock daily driver |
#4
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the chain guides went dead, the chain slapped around long enough to break one of the engine covers and bend some pistons or valves or who-knows-what - just long enough for me to pull over from the main lanes of traffic onto a side street... Damage was done...
the mechanic thinks that it would be better to get a replacement engine, but this particular engine is rare, and whatever i can find costs a lot... the car with fully functional engine tops at $12K maximum, with a generous buyer... dropping $6K-$8K into this car makes no sense... I was hoping to get a $1.5K-$2K M62TUB44 and get it up and running for the local errands, nothing long distance anymore...
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E53 X5 4.6iS 147K mi - Sold May 2013 Tireprints left in: USA, Nicaragua, Costa Rica, Panama, Russia E53 X5 4.8iS built 2005-10-17 66200 mi - June 2012 96000 mi - June 2013 112000 mi - June 2014 OEM fire extinguisher OE first aid kit OE tow hitch OE TV module OE aspheric mirror K&N air filter black/white badges rear camera 4-channel video recorder Here is the list of things I have done to the X |
#5
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I am no expert but I guess it might be doable if you can get the ECU that belongs to the motor.
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2003 4.4i black ext./black int./black headliner (kid's runabout) 2014 535d X-drive, M package, silver/black interior Sold but not forgotten: 2009 E70 35d, black ext./black int./black headliner (sold 2021) 2006 4.8iS Le Mans blue/cream int./black headliner, SOLD in 2012 sadly... Other hardware: 2015 Cayenne S (wife's new DD and definitely wroooommmmm) 2016 Tundra 1794 edition crew cab, luxo hauler 2005 Tundra crew cab, weekend hauler. Sold after 150k very happy miles. |
#6
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do an S85 swap
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12 X5 M - 06 X5 4.8iS - 03 X5 4.4i - 03 M5 - 02 X5 4.6is - 99 M3 Dinan S3 - 98 M3 - 92 850i-6 - 92 850i - 91 325ix - 89 M3 2.5 - and a few parts cars |
#7
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I think your first step is opening it up to assess the damage. You might be able to rebuild the motor. If not, bolt the 4.4 in there and fire it up. I'll bet it runs on the 4.6 ECU.
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2002 X5 4.6is - Titanium Silver / Black Alcantara - Dinan Stage 2 - Bilstein/Eibach - Brembo BBK ----SOLD--- 1993 318i - Brilliantrot / Tan - bone stock daily driver |
#8
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#9
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V10???
wow!!! years ago, I chose the nik Terminator, because this thing would terminate anybody's attempt to pass it on a highway... I had taken that particular car to 140 MPH and it was rock solid... Over the years it had gathered some battle scars, some are just "tissue" deep and some were more heart-breaking... It is like an old war horse, I just don't have enough guts in me to part it out, but getting a full fledged 4.6 engine is hurting the wallet... I was thinking about 4.4 V8.... But if I will get the V10 then maybe I will have to change my nik to FrankensteinX5!!!! Unless it is already taken... lol... |
#10
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V10 will cost a lot more. I bet it doesn't run with a 4.4 motor with a 4.6 ecu. You would probably need ecu, cluster, and harness. Then you would need to code all the electronics to new ecu.
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2006 4.8is, Black on White. SOLD Sniff Sniff. 2017 F85 x5m, Black on Red. BEAST MODE "The older we grow the greater becomes our wonder at how much ignorance one can contain without bursting one's clothes." - Mark Twain Unlock OBC post 5 |
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