WHP auto vs. manual

[ScaryFatKidGT]

How much more WHP does a manual equipped EJ25 make vs. an auto torque converted one?

[decke48]

it really shouldnt madder as long as your pull on an auto the TCC (torque converter clutch) is engaged. other wise auto run ~90% efficiency if the TCC is disengaged

[ouch1011]

The auto has a lot more weight it has to spin up to speed compared to the manual, so it will produce less power to the wheels than a manual. Plus I'm not sure if there is any conditions under which the tcc is locked at wot on a Subaru. But I never really tried while it was in my car.

[rougeben83]

you have to keep the auto transmission from kicking down or else it will throw off your dyno plot.

[ouch1011]

Running manual 2nd would take care of that, but I still don't think the tcc engages in 2nd.

dont remember where i found this, may help


The first difference between the 4EAT and 5MT is the AWD system. 5MT models use a permanent 50/50 split between the front and rear wheels, whereas models equipped with the automatic make use of the technically superior VTD system (mentioned above). The second difference is the gearing. The 4EAT uses 4 gears to make use of its power, where 5MT models make use of 5 gears.

From a stop: The 4EAT (stock) is much different performance-wise than the 5MT. Models equipped with the 5MT are able to achieve their pavement-rippling sub-six second 0-60 and low 14 second ¼ mile times thanks to its ability to launch at 4000+ RPM. Models equipped with the 4EAT must use the brake-torque technique (I also take no responsibility for potential damage caused to your car using this technique), however, stock 4EATs using this method can only launch at a maximum 3200 RPM, leading to a 0-60 time in the low 7 second range and a ¼ mile in the mid-to-high 15 second range.

From a roll: Judging from the very few 4EAT vs 5MT races that I have studied, a 5MT will have about a 2 car lead on a similarly equipped 4EAT in a race from 40 MPH to 100 MPH. Please note that in the few documented races known, the 4EAT begins to trail after it shifts to 3rd gear, leading me to believe that the 4EAT’s major weakness are it’s gear ratios.

Stock 5MT models dyno at around 170 WHP where 4EAT models dyno at around 150 WHP. From my research, I have noticed about a 20-25 WHP difference between similarly equipped 4EAT and 5MT’s due to the extra driveline loss through the torque converter.

[ScaryFatKidGT]

OK thx

Yeah being able to launch a 4EAT would defiantly help acceleration.