Stage 3 tuning takes the physical mods beyond the mere unbolting (on many Mercedes) of the cats, and physically modifies the Turbos. Stage 3 Tuning Definition Approximately >70hp-300hp gained from improving turbos & methanol.
Stage 2 chip tuning upgrade#
Some people may also upgrade cooling at this point. This part connects to a cat and 02 sensor, this part can be replaced separately at a muffler shop for off road use or replaced with upgraded higher flow cats. There are two different ways parts, one is a turbo back which will improve restrictions and produce a good power gain of 30-40hp. The stage 2 tune removes the CEL when these "primary" cats are removed and may also change the tune based on the idea that the cats are removed. While Stage 1 tuning can be completely reversible, Stage 2 will require modification to return back to the stock ECU. This stage 2 tune is a difference because it will throw codes without some modification back to stock if the stock ECU is used.
Although the turbo back cat delete, for a race car or as local laws permit, can be fabricated and installed at an exhaust shop for approximately $200 a piece so $400-500 is a fair price while shipped it can run upward of $1000. This can be done in two parts and some manufactures do sell that way. The turbo downtubes are replaced and often the cats are replaced as well. While stage 1 may include exhaust, in stage 2 exhaust is 100% addressed. More than 50hp gained from turbo back pipes (2 parts), mid resonators, ECU Remap/tune The above video by weistec is an example of stage two tuning. For example AMS performance, some say Renntech, and OE try to deliver 585 crank hp from the ECU tune on a M278 which is at stock likely 450-460hp although rated by mercedes at the crank at 402 in some applications. Increasing pressure and boost the ECU tunes can improve HP by a fairly large amount. The ECU tune, or remapping will try to optimize the engine based on generic information, or specific information. Adding airbox risers, filters, and deleting resonators/mid-exhaust should result in 23-35 at wheel hp according to UPD and other dyno runs for such engines as the m278. Some people also will do exhaust in stage 1.Īlthough many tuners put this together and describe it as stage 1. Stage 1 tune often employs an ECU tune, an airbox upgrade as needed (risers, UPD kit, ROW box) with better filters. Stage 1 Tuning Definition Approximately 60hp-130hp gain from ECU remap/tune, air box/filter, and optionally exhaust. Which is a different rabbit hole for a different post. This holds true currently, but it may evolve over time as different driveline technologies are employed. I am sure a strong epistemological argument can be made that these stages are meaningless and etc, but in practical measures this is what the various tuning stages implies for late model bi-turbo Mercedes Benz vehicles. In general many people describe various tuning stages, and while this may not constitute a specific definition this does aide in communication amongst similar minded people. This is the introduction to the tuning stages vernacular. As an introduction to different tuning stages I thought of a piece that would cover things broadly and then an individual piece for each level describing perhaps what it would entail for different cars and etc.
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