RENNtech GL450,GL550 ECU Tune Big Horse Power
Please PM to place an order or with any questions.
Price-$2740
GL 450 (X166- M278 Biturbo Engine) Stock Performance:
- 362 HP @ 5,250 RPM; 406 LB-FT @ 1,800 RPM
- Note: Mercedes M278 engine performance when measured obtains higher numbers that rated from factory.
- 501 HP @ 4900 RPM; 576 LB-FT @ 4100 RPM
- 429 HP @ 5,250 RPM; 516 LB-FT @ 1,800 RPM
- Note: Mercedes M278 engine performance when measured obtains higher numbers that rated from factory.
- 501 HP @ 4900 RPM; 576 LB-FT @ 4100 RPM
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The Best of Mercedes & AMG
https://mbworld.org/forums/gl63/5388...le-wheels.html
Also, do you provide custom tunes for customers that don't want all the power of your standard tune?
Thanks.
Also, is Mercedes using different intake and exhaust setups to generate more horsepower/torque on different models using the M278 or are they just using the ecu?
Last edited by 43221B; Jul 9, 2014 at 07:31 AM.
Also, do you provide custom tunes for customers that don't want all the power of your standard tune?
Thanks.
Also, is Mercedes using different intake and exhaust setups to generate more horsepower/torque on different models using the M278 or are they just using the ecu?
Sorry don't mind me; I'm just upset about my gl550 getting 10.4 mpg and had suv for 2 months now and still haven't punched the gas yet aaaaaand driving mostly highway; that 13 to 16 ratio is way off... lol if I knew it was gonna be that bad I would of got a gl63...
Sorry don't mind me; I'm just upset about my gl550 getting 10.4 mpg and had suv for 2 months now and still haven't punched the gas yet aaaaaand driving mostly highway; that 13 to 16 ratio is way off... lol if I knew it was gonna be that bad I would of got a gl63...
This. +1
we took a 300 mile trip from san diego to central california up highway 101 and averaged 20.8 mpg.



These guys make a chip for the GL350 and it boosts the HP and Torque about 28%. It is less expensive than a typical Renntech tuner kit, but should deliver similar or better results than Renntech.
They also offer a "Pedal Box" that deals with the known problem of the lag in execration off the line of the stock GL350.




