anyone know how to remove/ adjust the speed limiters in 2008 Subaru outback’s (2.5i limited)? Just found out mine only goes to 85.
Lucky08outback
Just some thoughts . . .
Unless a previous owner reprogrammed the engine control module, I'm fairly confident there's no speed limiter around 85 mph.
However, that's not to say there are no limits. There is usually a limiter for engine rpm that usually kicks in (fuel cut) when in the red line area (~6000-6500?)
It's also likely there's a vehicle speed limiter, but that would typically kick in (throttle control) at much higher speed, e.g., around 125 mph.
Presuming the car is stock, engine is the 2.5, 4-cylinder non-turbo, and the transmission is the 4-speed automatic, then at 85 mph, in 4th gear, with the torque converter lock-up clutch applied, the engine would probably be running somewhere around 3400 rpm, i.e., not near red-line.
When driving your Outback at 85 mph, what's the engine rpm? Is the transmission in 4th gear? Can you tell whether or not the torque converter clutch is engaged?
What happens when you try to increase the speed above 85 mph? For example, does the rpm go up but the car doesn't accelerate? Or does neither the rpm or vehicle speed increase/
The inability to exceed 85 mph could be due to other factors, including fuel condition and fuel delivery, air flow into the engine, and exhaust flow out of the engine, just to identify a few.
Unless a previous owner reprogrammed the engine control module, I'm fairly confident there's no speed limiter around 85 mph.
However, that's not to say there are no limits. There is usually a limiter for engine rpm that usually kicks in (fuel cut) when in the red line area (~6000-6500?)
It's also likely there's a vehicle speed limiter, but that would typically kick in (throttle control) at much higher speed, e.g., around 125 mph.
Presuming the car is stock, engine is the 2.5, 4-cylinder non-turbo, and the transmission is the 4-speed automatic, then at 85 mph, in 4th gear, with the torque converter lock-up clutch applied, the engine would probably be running somewhere around 3400 rpm, i.e., not near red-line.
When driving your Outback at 85 mph, what's the engine rpm? Is the transmission in 4th gear? Can you tell whether or not the torque converter clutch is engaged?
What happens when you try to increase the speed above 85 mph? For example, does the rpm go up but the car doesn't accelerate? Or does neither the rpm or vehicle speed increase/
The inability to exceed 85 mph could be due to other factors, including fuel condition and fuel delivery, air flow into the engine, and exhaust flow out of the engine, just to identify a few.
Just adding to the above, I looked inside my ECU code in detail a few years back and located the limits. If I remember correctly, the main cut-offs are rpm and speed and they take effect by turning the injectors off until speed and / or rpm are back in the allowed range. The injectors are also turned off under other scenarios (eg) overrun rpm cut-off, AT requested torque is too high, and some sort of counter related to the gear which I never fully got to the bottom of.
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