SL55/63/65/R230 AMG: Upgrades Not Manifested in Dyno Results
Thread Starter
Member
Joined: Feb 2019
Posts: 230
Likes: 21
From: Orchid Island, FL
SL 55 AMG, BMW M Roadster, Holden Commodore SSV
Upgrades Not Manifested in Dyno Results
Need some input on my lack of results after having significant upgrades to my 08- SL 55. After MBH LT headers, a 76mm UPD pulley, Weistec dual pass heat exchanger and RACEIQ tune installed, my dyno results have barely moved. I base lined at 445WHP/503 LB FT Tq and the best pull so far post mods is 451/517.
Is this likely the result of a tune not taking advantage of my mods? Something else like belt slippage?(which by the way I don't hear or feel so wouldn't know how to recognize it).
All dyno runs done on same dynojet, same technician and in the case of my most recent pulls, better DA conditions.
Is this likely the result of a tune not taking advantage of my mods? Something else like belt slippage?(which by the way I don't hear or feel so wouldn't know how to recognize it).
All dyno runs done on same dynojet, same technician and in the case of my most recent pulls, better DA conditions.
MBWorld Fanatic!
Joined: May 2015
Posts: 4,037
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From: Miami, FL
2003 CL 600
Looking at your graphs, the power is falling off dramatically at higher rpms vs stock. I'd bet air in the cooling system or a dead pump, the car is pulling boost/timing to be safe as the temperature climbs, it's making all of it's power at torque at super low rpm, not building up as it revs.
Thread Starter
Member
Joined: Feb 2019
Posts: 230
Likes: 21
From: Orchid Island, FL
SL 55 AMG, BMW M Roadster, Holden Commodore SSV
Even in Dyno mode, the tech has trouble in 3rd and 4th gear with the car wanting to down****, this may account for the curve shapes.
I monitor the IAT, they are typically 20-30 degrees above ambient, spike higher on hard pulls but drop right back down. within a minute or so.
I am VERY frustrated by this...............
I monitor the IAT, they are typically 20-30 degrees above ambient, spike higher on hard pulls but drop right back down. within a minute or so.
I am VERY frustrated by this...............
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Joined: Jul 2007
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From: Houston/ Austin /Toronto / UAE / Minneapolis / Orlando /Cincinnati
Eurocharged Performance ML63 and TT lambo
Looking at your graphs, the power is falling off dramatically at higher rpms vs stock. I'd bet air in the cooling system or a dead pump, the car is pulling boost/timing to be safe as the temperature climbs, it's making all of it's power at torque at super low rpm, not building up as it revs.
MBWorld Fanatic!
Joined: Dec 2006
Posts: 1,308
Likes: 62
From: Bethesda, MD
2000 SL500
There is a bleeding process for the IC that a lot of people don’t know about. Look this up on the forums after I had the heat exchanger added and new pump I was having issues with this and was fixed with a proper bleed
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