rb25 transmission vs rb20 transmission

[frosted flakes]

Hello,

I might do a 5 speed swap here on my rb20det auto transmission because auto is boring. I want to upgrade my rb20det in the future which i plan to get atleast 300RWHP so which transmission would be better rb25 transmission or rb20? I do have a limited budget so what do you guys think? Also what kind of clutches/flywheels to use? also does the rb25 transmission bolt up to the rb20det bell housing? and finally would a 5 speed give me better 1/4mile times than the rb auto transmission? sorry for all the questions just anxious to know answers.

[JCAP_Tuning]

rb25 transmission is definitely more stout and beefier than the RB20, if you can get your hands on one for a reasonable price I would go with that.

As for auto vs 5spd, stock for stock the 5spd would give you better times, IMO. Although an auto transmission holds boost longer, so I guess it would depend on how the car is setup, but just my opinion.

Anyone have experience running automatic on the track?

[undertaker]

i have run my auto laurel (RB20DET) at the track. i was able to get some boost on the start line by loading it up against the brake and found it to be nice and consistent which is good for dyo. i also think a manual would give better times but a modified auto would also work well, the standard auto is a bit lazy for track work.

[Nameless EJ6]

Most skyline people seem to say that the autos are a bit faster because of the fact they hold boost when shifting (as said already). As for launching, I don't think the auto can perform as well as a manual in that department. Maybe with an aftermarket torque converter or something...