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| 12-02-2025, 01:47 AM | #1 |
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The E31 850i (6MT) Project begins. Dyno, Exhaust, and more!
 Featured on BIMMERPOST.com The engine has to come out because of a leaky rear main seal, and we are planning to build a custom catback/valved equal length stainless steel exhaust for it and possibly doing some headwork for additional flow and power. So I decided to dyno it to get a baseline! Related threads I previously posted: Post purchase: https://g80.bimmerpost.com/forums/sh....php?t=2203013 Replacing the rusty mufflers: https://g80.bimmerpost.com/forums/sh....php?t=2215434 PS: The entirety of the exhaust system will be done by Fusion Motorsport Fabrication, located at Pickering, Toronto. https://fusionmotorfab.com/ They also just recently finished the absolutely stunning custom catback/valved titanium exhaust for my E92 M3 which you can follow here: https://www.m3post.com/forums/showthread.php?t=2210028
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 '25 M4 CS Riviera Blue - '23 M4 XD SPY - '11 E92 M3 6MT - '00 E39 M5 6MT - '98 E38 750iL - '91 E31 850i 6MT Last edited by Gottagofast; 12-03-2025 at 02:25 PM.. |
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| 12-03-2025, 08:47 AM | #2 |
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Colonel
 
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Used to own one. Fun car. Subscribed.
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| 12-03-2025, 09:24 AM | #3 |
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Love it. Fun times.
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DDDGGG_M600.00 Gottagofast1596.50 |
| 12-03-2025, 09:43 AM | #4 |
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Nice don’t see enough of these
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| 12-03-2025, 10:52 AM | #5 |
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Garage List 2010 M5 [9.67]
2016 BMW 340xi M Sport [9.50] 2019 X5 50i M Sport [8.17] 2010 535xi [10.00] 2013 M5 [10.00] 2012 X5 M [10.00] |
WoW! 2x the cylinders of an E28 M5,...E36 M3,...E46 M3,...335i,...535i (F10 / 3x more than 528i F10), and less power than every F30,...G20, G30 and it barely makes 212Hp! Yet! The 5.0L V10 in the E60 easily makes 500+ Hp! Clearly, the price of the V12 850 was based on 1) Styling and 2) number of units built!
Edit: Lovely car though!
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| 12-03-2025, 11:48 AM | #6 | |
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Quote:
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| 12-03-2025, 11:48 AM | #7 |
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Such a beautiful car....
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M240i Coupe (6MT) (2021: 6/2021 build )
Accord Coupe (6MT) (2017) 335i Coupe (6MT) (2007: 9/06 build SOLD 8/2016) Prelude (5MT) (1995) |
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| 12-03-2025, 12:19 PM | #8 |
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Love it. Looking forward to the build.
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2004 E46 M3cs JB/CSL
2010 E70 X5M AW/BLACK 2011 VW Golf R DSG White/Black 2018 VW Passat SEL IG: @060Motorsports / @junglehour |
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| 12-03-2025, 03:39 PM | #9 |
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Absolutely stunning! Please keep this updated as you progress
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| 12-03-2025, 05:55 PM | #10 |
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Subb’d!!
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| 12-04-2025, 02:04 AM | #12 |
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You guys wouldn't happen to know where I can find a pair of Schrick cams for the M70, would ya? I've been looking and I can't seem to find any.
Schrick item number: 0239L1641-00 / 0239R1641-00 After we do all the headwork, that'll be the last piece holding us back.
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'25 M4 CS Riviera Blue - '23 M4 XD SPY - '11 E92 M3 6MT - '00 E39 M5 6MT - '98 E38 750iL - '91 E31 850i 6MT |
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| 12-04-2025, 06:50 AM | #13 |
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Garage List 2014 Tesla Model S P85 [0.00]
1955 Triumph TR2 [0.00] 1988 BMW 325is [0.00] 2008 BMW 328xi [0.00] 2005 BMW 325ic Coupe [0.00] |
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| 12-04-2025, 01:46 PM | #14 |
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Always have loved these cars, looking forward to the updates. Thanks
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| 12-05-2025, 08:08 PM | #15 |
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Love these cars, I regret selling mine.
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| 12-19-2025, 03:35 PM | #16 |
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I have some potentially good news. We've been talking to Schrick and the only way we can get a set of new cams, is to order at least 10 sets. That's the minimum order quantity.
Essentially, we have to do a group buy which is why I need to ask if anyone is interested in a set of Schrick cams for the M70 engine. Given that they are quite unobtanium on the web at this moment, it would be a good opportunity to get a set. Schrick item number: 0239L1641-00 / 0239R1641-00 Let me know folks!
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'25 M4 CS Riviera Blue - '23 M4 XD SPY - '11 E92 M3 6MT - '00 E39 M5 6MT - '98 E38 750iL - '91 E31 850i 6MT |
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| 12-19-2025, 07:43 PM | #18 | |
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Quote:
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'25 M4 CS Riviera Blue - '23 M4 XD SPY - '11 E92 M3 6MT - '00 E39 M5 6MT - '98 E38 750iL - '91 E31 850i 6MT |
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| 12-21-2025, 07:41 AM | #19 |
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Unrelated, but we are done with the E92's exhaust.
https://www.m3post.com/forums/showthread.php?t=2210028
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'25 M4 CS Riviera Blue - '23 M4 XD SPY - '11 E92 M3 6MT - '00 E39 M5 6MT - '98 E38 750iL - '91 E31 850i 6MT |
| 12-22-2025, 05:00 PM | #20 |
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Exhaust looks great. Bimmerworld did dyno testing years ago that showed moving the X forward to where the pipes narrower after the transmission yielded a measurable increase in torque.
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| 02-11-2026, 02:19 AM | #21 |
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The engine and trans are coming out soon, and we have on hand all the gaskets and seals that we need to refresh the engine.
Since the cams and pistons I was originally planning to use are unavailable, we have decided the best route to make additional power (and noise) is to supercharge it. It's not set in stone yet but it seems the logical choice given the low compression nature of M70.
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'25 M4 CS Riviera Blue - '23 M4 XD SPY - '11 E92 M3 6MT - '00 E39 M5 6MT - '98 E38 750iL - '91 E31 850i 6MT |
| 02-24-2026, 05:02 PM | #22 |
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The restoration has begun.
Engine bay and underside conditions are absolutely pristine.
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'25 M4 CS Riviera Blue - '23 M4 XD SPY - '11 E92 M3 6MT - '00 E39 M5 6MT - '98 E38 750iL - '91 E31 850i 6MT |
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