not really looking for an argument over the internet but the sort of autos drag racers use are nothing like the autos that are factory delivered

anyways.... cool that your doing something different... my girl always wants me to do an auto one so she can drive it too

soundslike you will have enough power to overcome the losses that an auto brings

good luck... try to find a picture of a box on the silvia site (www.nissansilvia.com) for comparing the two siffrent CA boxes

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granted those are specially built autos, with torque converter stall speeds matched to the engine output, rear end gears, ect. and the most important thing...THEY ARE SET UP PROPERLY!

the head transmission rebuilder and an old engine rebuilder, at the shop i work at, says a properly built and set up auto transmission will OUT SHIFT a 3/4/5/6spd manual anyday! (he's also an ex drag racer and used both manual and auto transmissions, so he knows what he's taking about)

If it's built properly, ie strong enough clutch packs to hold the power without slipping and burning the dam thing up, and strong enough hard parts to handle the abuse, with the proper torque converter (most likely in this case specially built to suit it) for the usage and specs, and a good shift kit if possible it will shift faster than having a manual box in there.

my $0.02

yeah keep us posted as to how it turns out, it will be interesting. maybe revhead can do you a deal on a sweet holinger

i read a long time ago a guy in S.A. was building the jatco's strong enough to handle over 450 hp....with the right stall converter i think it will be ok...it won't be a daily or anything so if it doesn't perform the best on the road i will just ride my kwaka or drive my other car (won't mention here...aka not a datto)

kev rowley is doing an auto behind a spasticly huge RB motor in a 120y sedan for drag racing only...he did say the auto behind a RB20 in this car was sweet to drive on the street even with a 5k stall or something silly

I want to do the same in my sedan i have some friends with turbod 4cyls with autos but the boxs have been built they are great fun big burns and 10 sec quarters go for it and keep us updated someone on here had a ca20 3spd auto behind there ca18t

If I ever get my engine rebuilt to make some serious power I'll be going auto. They're the way to go if you have drag racing in mind or don't want to worry about smashing manual gearboxes. (You probably have) but if you haven't done it already I would look into prices of say a 3 or 4 speed jatco, c4 or even a trimatic.

They might be cheaper than building up a CA box and the Jatco's etc have been tried and tested heaps before. I really have no idea though Just an idea. Should be good either way