looking to turbo my car eventually. have an 2001 now. will want to build and turbo a base h22 and swap. If anyone has done this I would appreciate a complete list of anything I will need to do the engine and tranny swap. ie: transaxle changes, motor mounts, etc. what all needs to be removed (tranny, atts unit, etc.)

thanks!!

 

All you need to do is change the axles and tranny....Correct me if I'm wrong, but isn't the ATTS unit seprate from the tranny? Isn't it connected to the block?

 

IF you use the complete engine/trans setup from a BASE you MUST swap the front axles as a minimum. The setups are very different from one version to the other. The front suspensions are not interchangeable. Your project may be easier with a different chassis or using the SH setup with the turbo.

 

wow, thats 2 different answers!! i was under the impression that the suspension was the same and that all i needed was an intermediate shaft and 2 new transaxles. am i wrong!! i hate to turbo the SH and have it not function, i would rather a Quaife that works!!

 

ttt

 

From what I know, you can turbo the SH and it'll work fine as long as you keep it @ 5psi or less. if you want to do more boost, just disactivate the atts by pulling the fuse.

The transmissions are the same except the SH is equipped with a planetary gear type differential. The ATTS unit is mounted on the back of the engine where the extension shaft would be normally located. The left driveshaft extends through the unit and extension from the right drive shaft goes into the unit. Both engage a planetary gear set inside the unit.

As for the suspesion, on the SH, the radius rod attaches to fron tbeam via ball joint, and attaches to the steering knuckle rather than the LCA as in the base model. So basically, the point where the torque is transferred to the wheel is right on the steering axis, and not outboard of it like on the base model.

 

The H22a you put in must have a tranny with it. The SH tranny will not bolt up without modifications.

You need axles and an non-ATTS ecu, I though the ball joint fork was different as well?

 

well, i plan on boosting quite high (18psi or so) so i think I want a limited slip diff. like a quaife. so, looks like i should expect to get more than just the engine/tranny? i guess i will need at least forks and lcas then??

 

Yeah get the tranny and put in an LSD, I have a Kaaz, I don't know of anyone else that has one on a prelude....

18 psi? hmm well then you need a good standalone system so don't worry about ecu...Don't turbo an SH whatever you do, not that high especially.

 

well I guess its me, but why did you buy an SH if you didn't want its functionality? I would suggest just trading in cars and getting a base model. Mileage shouldn't be an issue since you are going to have to do some block work to run 18psi. Go ahead and sleeve the motor and have it blueprinted and balanced to make sure everything is perfect. I bought my SH because I wanted the SH and what it had to offer. The suspension, transmission and axles are different. There is a separate ECU for the ATTS unit. As of now, my SH acts fine with my JRSC @ 6psi, but a turbo is a completely different story.

 

I'm also in the same boat as you. All you need is to buy an engine/tranny from those engine shops. They sell it with the axles and ECU, so you're all set. Just drop it in and thats it.

 

hey, wait now...

this is getting a bit too confusing. The suspensions are supposedly different. At first I though it was just the engine/tranny and transaxles. Now apparently the suspension won't mate up with the base model transaxles???

what is the correct answer???

 

Yeah, suspension is different between the both, but you really don't need to change out the springs and shocks for this project. I dropped an SH motor into my base model prelude, cause I hydrolocked my first motor. All I changed out were the axles and the wire harness. I used my base model tranny, header, and ECU, and it works fine. I left my base model suspension on and theres no problem at all. Both models have the same motor block. Only thing different is how the oil filter sits.

 

so there is no fitment problem with the suspensions? someone mentioned that the transaxles mount to the knuckles differently.

 

Nope, they just slide right through. I used my base model axle on the passanger side, and had the driverside bracket modiffied because of the block.

 

so if I got a complete base swap with tranny/engine/transaxles with the intermediate shaft, they should all line right up??

 

right...Don't forget, you're need the Base model ECU.

 

shouldnt matter if i use a p72 and hondata. Please, if anyone has a contradictory statement or can confirm this, let me know!

 

Its a p13 OBDII ecu for the newer preludes

 

The master plan is a rebuild on a base engine and tranny and turbocharger. then swap into my SH and sell my SH engine/tranny/axles

 

ttt

still need a definite answer from someone who may have done this. are there any suspension changes that need to be done?

 

Actually you don't need a base ecu...the SH ecu operates fine with no ATTS computer. I ran mine like that for a couple thousand miles before swapping in my standalone.

Gruvy- You need not worry about the suspension differences. The biggest problem you'll have is the intermediate shaft bolting up. From everything I've seen you need to fab a bracket to bolt the base intermediate shaft to the atts mounts. I was just given an h23 tranny for helping with a h22 swap so since my motor's down for the count again I'm gonna swap in the tranny w/ a quaiffe while everything's apart...I'll take pics. Now I just need to locate a base intermediate shaft...

--Ian

 

ian, thanks
sorry, i just saw a base model intermediate shaft being auctioned on ebay last week. i almost bought it. since i will be buying a base engine/tranny/transaxle swap, i figured i didnt need it!

so now i have 2 people telling me the base engine/tranny will mate up with the sh suspension. Is this correct? anyone else care to argue that before i set my mind on making this swap/rebuild?

also, anyone interested in a low mileage SH complete engine/tranny swap when i do this?? I only have 3500 miles on the car right now. It would be an excellent buy for someone out there!

 

Now this is a little off your subject, but can't the SH motor just be used? I mean, what is really the difference between the both other than the ATTS? Cause both are the same exact motors. Can't you just disconnect the atts unit. Is the SH tranny a little weaker than the Base model? I was just wondering before this guy spends the money on buying a whole new one.