LSD for a SH - Honda Prelude Forum

ziggity · 05-21-2001, 02:09 PM

do they make a LSD for asn SH

71dsp · 05-21-2001, 02:24 PM

Uh, that's what ATTS is for. Some people have wanted an LSD for the SH because of turbos and what not, but there hasn't been any made that will fit.

ziggity · 05-21-2001, 02:29 PM

corrext me if i am wrong ,but ATTS is totally different than the LSD because LSD makes the tires gruip going straight while the ATTS makes the prelude "carve" into corners

nighttime · 05-21-2001, 06:21 PM

Correct me if im wrong, but from looking at my shop manual, the base and SH use two different transmissions. Seems to me if you just HAD to have an LSD and you drive an SH, you could get a base transmission (M2Y4 is the code) and put an LSD in it. Of course, this would be more expensive. You would most likely have to use the right driveshaft and intermediate shaft (and all associated hardware) from the base as well. Ive never looked under a SH though, so I might be wrong about all of this, let me know.

BTW, anyone know how much a non-SH transmission costs used?

71dsp · 05-21-2001, 06:46 PM

That's true, ATTS does not work in a straight line, but it's intended use is as an "active" LSD. It is supposed to be superior to a mechanical LSD, but I prefer my Quaife, although I haven't competitively driven an SH.

A base transmission will not bolt to the SH block. The clutch housing is different (they have different part numbers). The transmission housing is different as well. The mainshaft and mainshaft components are the same, but the countershafts are different. The countershaft components are the same, however. It appears that the final drive gear and the differential are separate pieces on the base, but the differential and final drive gear are one unit on the SH. They are different, so I don't think an LSD made to fit the base model will work. Oh, I know all of this because I have a Prelude parts manual right here in front of me!

nighttime · 05-21-2001, 07:48 PM

Thanks for the info 71dsp, its good to see some of that on the board.

Since the clutch housing is different, is the SH block different also? From some of the illustrations, the oil cooler's mount on the block in two different places, which makes me think that they are. (This is where a part manual would instantly answer that question) Where did you get the Prelude parts manual from, Id be interested in getting one of those.

Gabe · 05-21-2001, 07:58 PM

Quote:

Originally posted by nighttime
Thanks for the info 71dsp, its good to see some of that on the board. Since the clutch housing is different, is the SH block different also? From some of the illustrations, the oil cooler's mount on the block in two different places, which makes me think that they are. (This is where a part manual would instantly answer that question) Where did you get the Prelude parts manual from, Id be interested in getting one of those.

Yes the blocks are different, different part numbers and everything. The interesting thing is that they seem to change every year except for the 98-99 SH models. I have a parts manual too, I bought mine off ebay.

Someone on hp.com is trying to fit a base tranny to an SH block so welll find out shortly if they bolt up.

Gabe

Asian_Stylin · 05-21-2001, 08:30 PM

Ok if the Tranny are different then are the Clutch kits different too? I just bought an ACT XT clutch from ACT for my Lude. I have an SH so will it fit onto my SH or did I just ****ed up and got the wrong clutch!! Its kinda worrying me after hearing all this. thanks for any info guys.

nighttime · 05-21-2001, 08:56 PM

Good deal. Ill have to keep an eye out for one of those parts manuals.

Quote:

Someone on hp.com is trying to fit a base tranny to an SH block so welll find out shortly if they bolt up.

Ill have to look out for that too. Its always interesting to see people doing things that no one else has tried (that we know of) yet.

Gabe · 05-21-2001, 09:24 PM

Quote:

Originally posted by Asian_Stylin
Ok if the Tranny are different then are the Clutch kits different too? I just bought an ACT XT clutch from ACT for my Lude. I have an SH so will it fit onto my SH or did I just ****ed up and got the wrong clutch!! Its kinda worrying me after hearing all this. thanks for any info guys.

I'm almost 100% sure that the clutches are the same.

Gabe

Jacques · 05-21-2001, 10:03 PM

71dsp, if I roadtrip down to Texas in my car, you can try out the ATTS if you like, only if I get to drive your car...after it's all back together

.

71dsp · 05-22-2001, 04:42 AM

Quote:

Originally posted by Gabe
I'm almost 100% sure that the clutches are the same.
Gabe

The clutch is the same.

71dsp · 05-22-2001, 04:44 AM

Quote:

Originally posted by jacques
71dsp, if I roadtrip down to Texas in my car, you can try out the ATTS if you like, only if I get to drive your car...after it's all back together .

You're more than welcome to test drive it now. You just have to add your own "vroom-vroom" sounds. Oh, and you have to sit on the floorboard since there aren't any seats.

Hopefully it will all be back together by the end of June [fingers crossed]. We will see......

Louie002 · 05-22-2001, 04:56 AM

acutally Honda make it's own
LSD for the Honda Prelude ..,
but it's only JDM ...
Honda Prelude Type S
comes with LSD and ATTS
too bad we can't get the
Type S over here

71dsp · 05-22-2001, 06:10 AM

The TypeS has ATTS. It doesn't have an LSD.

The S-Spec has an LSD, but no ATTS.

ThatPreludeGuy · 05-22-2001, 06:49 AM

I know this is a horrible way to know this but the SH has some sort of diff "lock-up" in a straight line. To piss off one of my friends I dumped the clutch around 7k one night in front of his house and left a SET of rails through first and second. Mind you this was perfectly straight, if the ATTS only works in a turn I'm not sure why I had wheel spin from both sides? But like I said somehow we (SH) get some kind of straight line lock-up.

nighttime · 05-22-2001, 08:30 PM

Quote:

But like I said somehow we (SH) get some kind of straight line lock-up.

Trust me, base models can do this too, without ATTS. I accidentally did this at a driving school (Evolution Autox school, its great, take one if you ever get a chance!) while trying to find the best way to get off the line. This was my first time autocrossing the Prelude, and my first time trying to launch a manual transmission car. Anyway, I left two nice even black marks off the line. I think I had the car at about 4k RPM and dumped it. I wont do that again though, had some wheel hop. I just laughed when the instructor pointed it out to me when I was working the course by the line.