 | Home > BMW Engine Conversions > 8HP behind a M57N2 |
 
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8264   
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Sorry can't help but interested to follow. What the change 6hp not coping for you? Cheers
James 110 2010 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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13th May 2025 10:23pm |
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| carrotbay Member Since: 18 Aug 2013 Location: Northants, UK Posts: 707  
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The 6HP was good for about a year. It developed a couple of issues. Firstly when cold it wouldn’t select 6th for the first mile or so. I then developed a speed related whine which was pretty loud. Initially thought that was transfer box related so swapped that but it was still there.
I’d already started gathering the bits for the 8HP conversion (picked up a very cheap box due to it’s BMW transfer case being damaged etc) and also wanted to make move from the 1.2 transfer box to a 1.1 for a more relaxed cruising speed. So while it was all coming apart anyway decided to move to the 8HP. Swapping the transmission on the drive with the engine in wasn’t much fun. I think it was easier swinging in the engine, gearbox and transfer box as one lump when I did the initial conversion! Already it is a much smoother drive and if I can sort the wheel speed issue should be able to improve that further with a bit of tuning of TCU. Phil 2008 Defender 110 XS SW - M57N2 / 8HP70X |
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14th May 2025 5:29am |
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| Linds Hanson Member Since: 16 Jan 2021 Location: Cornwall Posts: 520
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Have you spoken to Kenneth? CANTCU's dad
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14th May 2025 10:10am |
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| tommobot Member Since: 15 May 2018 Location: Stratford Upon Avon Posts: 34
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Can't help either, but with the wheel speed simulator, as long as the diff ratio and tyre size is correct CANTCU seems to work it out pretty faultlessly.
I've got no wheelspeed sensors or any modern bits, so its soley on relying on the simulator but behaves perfectly |
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14th May 2025 12:15pm |
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| carrotbay Member Since: 18 Aug 2013 Location: Northants, UK Posts: 707
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That’s a good call - I’ll make contact 2008 Defender 110 XS SW - M57N2 / 8HP70X |
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14th May 2025 1:11pm |
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| carrotbay Member Since: 18 Aug 2013 Location: Northants, UK Posts: 707
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It seems to be okay so far. I’ve calculated the final drive ratio, ie diff ratio and transfer box ratio combined and it seems to work so far. I’ll still chase down the issue with the wheel speed sensor though. An ABS and TCS light popped up this morning so clearly there’s a problem and probably a sensor. 2008 Defender 110 XS SW - M57N2 / 8HP70X |
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14th May 2025 1:14pm |
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