alright so i own a 98 honda prelude sh. i've been told a few times that you can't supercharge or turbo it and the reasons never seem to be something that sounds truthfull always seems to be "well i heard from my guy that you can't because of x" or i don't think the atts can handle more then 250 horses always something different that really just doesn't make sense. so what im looking for is if some one can give me technical proof of why you can't turbo or supercharger prelude sh because ive seen it done twice now and there don't seem to be any problems. i have every bit of info on the system i could get off the net which isn't much and looking threw the operation, construction, and wiring diagrams i really can't see why it wouldn't work because basicly it's just a electronically controlled differental. so please don't responed with i heard or anything like that but respond with here on this site they have technical sheets that you can read threw explaining why it can't be done. thank you to all who reply

 

I have a Turbo SH. I'm running really low boost (4-5 lbs.), so I haven't really hit the limit of the atts yet. However, if I drive hard, do a hard launch, corner too hard using too much throttle, etc.., it will trip the atts check light.

I'm guessing that I'm making a little over 200 whp and quite a bit more torque than stock and I can make it shut off, so I would think 250 would be way too much for it.

The other problem is if you're using some kind of engine management (uberdata, hondata, etc..), it disables the atts anyway since it has no way to control it. I'm using an FMU which is alright for low boost and keeps the atts, but anything over 6 or 7lbs. of boost needs real engine management like the ones mentioned above.

 

the only solution to keeping ATTS in an SH with engine management is the Greddy E-manage (or the VAFC, if that's all you need). both work with the obd2 P5P and that way you will be able to keep the ATTS system.

as far as it being a "problem" on sh's--it's only a problem if you like ATTS and want to keep using it. As far as technical proof of why the ATTS system craps out with that much horsepower, i'm not sure you're going to find a technical answer to that question. Being a fairly complicated, and not too well studied system, i'm not sure anyone really knows WHY. We just know that it doesn't work once you're putting down too much power.

It's not going to make the car undrivable, it's just that the ATTS becomes dead weight. Furthermore, if you've got that much horsepower, you're probably going to want a LSD--problem is, you can't install a LSD into an SH transmission...So it's not that the car won't mechanically work--it's just harder to get the car to work like you want it to.

 

from what i understand, the atts is basically the same system as the pilot/cr-v/element/ridgeline's vtm-4, which uses eletronically controlled clutches on each wheel to engage and disengage them. my guess is that with too much power the clutches will slip. i'll see if i can come up with anything more conclusive for you with what literature i have on hand.