Let the M117-968 560 Dyno Testing begin - Mercedes-Benz Forum
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post #1 of 101 (permalink) Old 05-10-2019, 04:53 PM Thread Starter
KRH
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Let the M117-968 560 Dyno Testing begin

The lads at Carobu Engineering are about to hit the engine dyno again with their own US Spec 560 test mule engine
https://www.facebook.com/pg/Carobuen...=page_internal

Their engine has just had the heads freshly re-furbed and new guides etc after they realised the valve guides were worn and the heads needed pulling after the last session on the dyno with the US spec factory exhaust complete bolted up (the whole exhaust right to rear muffler tip was removed from the car and dragged into the engine room and bolted up for testing if you scan down to their older FB posts showing the dyno read-outs as well

This time they have bolted up some AMG spec headers to see how they will perform

This R&D testing is to continue in phases as they work there way through various mods to see what will waken up the engine including swapping in 300hp cams i provided until they design their own cam and it will include mods they want to carry out in due course on the 560 intake to see if they can improve that intake without having to go to the expense a custom designed intake.

I think all of us will be able to closely follow this and enjoy the ride.
End result is they wish to come up with solutions for M117 owners with proven research on an engine dyno to back it all up

That last 560 engine they rebuilt was a full custom job with forged pistons and rods and EFI conversion using a highly modified D-Jet intake and custom AMG spec cams etc so that was an expensive build in the below link
1986 Mercedes Benz 560SL ? Carobu High Performance Parts and Accessories for Ferrari
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87 White Euro 500 "ECE" 265hp SEC
88 Black Euro 560 "RUF"300hp SEC
89 Blue Euro 560 "RUF" 300hp Hydro SEL

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post #2 of 101 (permalink) Old 05-10-2019, 08:44 PM
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I was honored my d-jet intake manifold went to Tate for Pearsonís 560sl. :-)

I am glad he is testing the components step-by-step and should be able to document the gains of each.

It seems that with Pearsonís 560sl the intake was a bottleneck. It seems that some boost would probably solve that. I wonder if they plan to test any boost systems.


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post #3 of 101 (permalink) Old 05-10-2019, 09:58 PM Thread Starter
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I believe they perhaps might be going to try out the Dkubus Franken-CIS bolt on system for mapping control of spark and fuel amongst the R&D work - would be interesting if they do as it keeps the engine bay looking stock


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87 White Euro 500 "ECE" 265hp SEC
88 Black Euro 560 "RUF"300hp SEC
89 Blue Euro 560 "RUF" 300hp Hydro SEL

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post #4 of 101 (permalink) Old 05-11-2019, 02:10 AM
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Ah it's that SL belonging to Mark P? Awesome.

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post #5 of 101 (permalink) Old 05-14-2019, 10:11 AM
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They completed their baseline run with both US exhaust and with tri-y's on their 9:1 US 560 motor.

Result, 26hp, 22ft/lbs torque.

Still lots more to come, apparently.
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post #6 of 101 (permalink) Old 05-14-2019, 08:51 PM
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So 26 HP gain just from the tri y manifold?



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post #7 of 101 (permalink) Old 05-15-2019, 08:50 AM
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If the tri-y's delivered a 26hp increase, then I'd expect that the Euro Logs with a dual exhaust sitting in my garage would get something in the middle, maybe 15hp. Hardly seems worth the effort. The 3.07 LSD I put in my 560SEC has made a huge improvement though.

Hope they come up with something commercially feasible for a reasonable HP increase!!
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post #8 of 101 (permalink) Old 05-15-2019, 09:15 AM
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Intake air volume (throttle body size, intake manifold design and engine bay hood clearance) will continue to be the primary roadblock to gaining significant performance gains for the M117. Head work, tri-y's, cams, fuel and spark systems (like Franken-CIS), increased compression ratio would get performance up to 325hp or so, but beyond that (assuming SOHC heads) is a challenge. Absent forced induction or quad cam heads, can't squeeze much more out of the M117. And getting to 325 ponies would probably cost $10-$15k.

Agree with Mike - a higher diff ratio is a good way to get noticeable performance improvement (at the expense of fuel economy - higher RPMs). Diff change and tri-y's are a sub $3k investment that would be really noticeable.
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post #9 of 101 (permalink) Old 05-15-2019, 11:22 AM
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Originally Posted by S320L1999 View Post
So 26 HP gain just from the tri y manifold?


No not just from tri y, look at the two exhausts . One is a full USA exhaust with manifolds , caTalyitc converter , mufflers etc . Just like a stock car.

The other is just tri y with no mufflers or catalytic converters , a completely open straight pipe exhaust . No one would really run a car like that .

Figure 10-15 Hp for the tri y and 10 hp for the lack of catalytic converters and mufflers
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post #10 of 101 (permalink) Old 05-15-2019, 11:43 AM
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The Euro 560 SEL with 10:1 CR came with 300HP from the factory, and 279 with cats.

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