help on JDM engine

i have a 5th gen sh and i was wondering if the ATTS had to be taken out to in stall a JDM engine (H22A G2)

Are you buying longblock? If yes, check where oil filter "outlet?" is on the block of the JDM engine. If it's in the way (and I'm pretty sure it will be) then the ATTS most likely won't bolt up to the JDM block. But you could still use your SH transmission without ATTS. You just need to buy 'base' model intermidiate shaft. I never had a JDM h22 so I don't know for sure about it.

Serge.

the only engine that will work is the JDM type S with the ATTS option... unless you plan on doing what i did and doing a complete swap, engine, tranny, axles, ecu, wire harness.....

"But you could still use your SH transmission without ATTS. You just need to buy 'base' model intermidiate shaft. I never had a JDM h22 so I don't know for sure about it."

NOT TRUE!!!! don't do it. the axle will go into the hole in the tranny, but it won't secure - the differential in there is 100 times different. with ATTS - the tranny sends ALL the power to the ATTS unit which replaces the intermediate shaft, then the ATTS will then transfer it either through it to the drivers side wheel - or back through a shaft that goes around the first shaft back through the tranny and to the other wheel. you need to do a COMPLETE swap - don't let anyone tell you different - hence my H22 / H23 swap combo - H23 tranny was cheaper and has slightly shorter gearing

Help me understand what you just said Phunyguy. reword it I may be able to help.

If you are swapping just engine blocks they you should not have a problem with the hardware hooking up to each other’s. Nothing is in the way on the JDM Block ( I have one) The ATTS unit bolts to the block in the same place the Intermediate shafts does on the Non ATTS. I May be able to see a problem changing ECU if you do.

I may be wrong. If I am some please correct me on the Bolt Up. I want to Know where you may have a concern.

Like i said.... in order to use a JDM motor in a 5th gen SH - you need to make it the Type S option with ATTS. the ATTS my bolt up to a base model block - but either way you do it - the oil filter will still be in the way. On the SH blocks, the oil filter was put up higher on the blocks and pushed way over to the drivers side. base model was put just in the center where the intermediate shaft is. the ATTS may bolt up - but it still will not work because the block is still completely different with different oil filter placement and different oil passages.

As for the transmission, the differential in the SH transmission is like a $1200 differential with all kinds of weird planetary gears and shit. I'm not going to explain again what it does and how it works... all you need to know is that it doesn't work. Please just trust me on this one... i fought tooth and nail to get this swap to work... and in the end it ended up being a complete swap just to save on cost.

Why does everyone have to argue with me? I'm probably one of like 5 ppl in the US that got a JDM OBD1 motor in their 5th gen SH and is willing to explain how to do it. Yet no-one wants to believe it. Oh well - you don't have to believe me - but when i get pics i will post them and you will see the pics of the H22A engraving in the block and the title that says 1998 Honda Prelude SH. I will also show you the tach at almost 8000 RPM (with or without valve float).....

*sigh*

*[/QUOTE] Why does everyone have to argue with me? I'm probably one of like 5 ppl in the US that got a JDM OBD1 motor in their 5th gen SH and is willing to explain how to do it. Yet no-one wants to believe it. Oh well - you don't have to believe me - but when i get pics i will post them and you will see the pics of the H22A engraving in the block and the title that says 1998 Honda Prelude SH. I will also show you the tach at almost 8000 RPM (with or without valve float).....

Man its cool, I was just confused with the first thread.
I gave a presentation to a class at a University on the Active Torque Transfer System (ATTS) I showed examples of hydraulic fluid flow through the unit, and the action of the planetary gear set in an understeer and oversteer situation. This presentation was complete with PGM Scan tool snapshots of the vehicle in a Yaw angle (represented in % depending on understeer and oversteer situation) situation. I took the snapsshots. I also had my friends Type SH and my non SH on the rack so the students could have a visual.

I didn't realize the difference in oil filter position. I guess it can only be seen when you are trying to do the swap.

Oh and why did you do the swap? Did you get a type S engine or just a JDM? I like the H23 Trany affect. good gearing huh.

Oh and why did you do the swap? Did you get a type S engine or just a JDM? I like the H23 Trany affect. good gearing huh.

one word. hydrolocked. :Banghead:

i decided to swap the jdm motor because i thought it would be cheaper then spendin an assload of money on an SH motor... and i STILL saved money by doing a complete JDM swap. as for the H23 tranny - the gearing isn't too much different but it is a bit peppier.

How is the H23 for strength?

How is the H23 for strength?[/QUOTE]


H23? The Block or the Trany? I can tell you the H23 Block (Main Bearings) don't like High RPM, at least mine didn't.

H23 Trany I never had a problem with about 210hp at the Flywheel, but as for more HP I don't know.

I used the final drive out of a H23 trany for my 01 H22A4 Trany good combo for top end.

gah gettin confusing... so its gotta be a full swap? is it really worth it to keep the atts and get a jdm? seems like too much of a hassle... does the atts make that much of a difference in handling?

Yes for factory set up. I can tell a difference
But if yo paln to change your suspension. do the complete JDM swap with a different trany.

for one your lude will be about 200lbs lighter without the ATTS unit and other goods.

Your car has a Trany cooler on it like an automatic would. Because you have the ATTS. It uses the cooler for the ATTS fluid.

take it out when you do the complete swap.less weight. every little bit helps.

gonna need a way to plug the holes in the radiator - or get a new one from the base model. (ATTS is cooled by your antifreeze - has hoses routed to the bottom of the radiator)

I used the final drive out of a H23 trany for my 01 H22A4 Trany good combo for top end.

uhh the final drive is the same for a H22 and H23 tranny.....

count the teeth
check a website
look in a manual
dirve my car

pick one

go to the dealer and check part #'s

try to use the same speedo gear (92 h23 final drive and 01 H22A)

i am... put my H22's speedo gear in the H23 tranny :-P.... and i was going by the ratio - not the number of teeth or the part number. i don't remember the exact number - but the final drive was exactly the same.

choke on this one a bit.

4th Gen
F22/S- H23a/Si - H22a/VTEC
--M2L5----M2S4----M2F4
1 - 3.307 - 3.307 - 3.307
2 - 1.810 - 1.857 - 1.950
3 - 1.230 - 1.320 - 1.360
4 - 0.903 - 1.034 - 1.071
5 - 0.705 - 0.812 - 0.870
FD 4.062 - 4.266 - 4.266
*Above info taken from USDM Helms manual.

M2B4 (JDM LSD) M2J5 (JDM) M2A4 (JDM)

1. 3.307 1. 3.307 1. 3.307
2. 1.950 2. 1.810 2. 1.950
3. 1.360 3. 1.269 3. 1.160
4. 1.034 4. 0.966 4. 1.034
5. 0.787 5. 0.787 5. 0.787
FD 4.266 FD 4.062 FD 4.266
*Above info taken from teardown and tooth counts.

5Gen:

1st 3.285
2nd 1.956
3rd 1.344
4th 1.034
5th 0.812
FD 4.266
*Above taken from USDM Helms manual.

FD = 4.266 for the H22A and the H23A (and the H22A4)

i am... put my H22's speedo gear in the H23 tranny :-P.... and i was going by the ratio - not the number of teeth or the part number. i don't remember the exact number - but the final drive was exactly the same.

Well I put the speedo out of a 96 H22A tranny into my 92 h23a trany. the speedo was off (checked by my GPS) Then the teeth ate against each other and I had to replace final drive and speedo gear. did alot of searching but found the right combination.

speedo works fine for me... and yes i'm too poor for GPS. can only make so much as an enlistee in the military :-/ ....... and i still am pretty sure the final drives are the same - the speedo may be different - but the final drive is the same - you gotta change the speed pickup when you change the speedo gear :-P ..... those gears gotta match

your right

my car works, your car works

good night

how much did it cost ya to do the full swap?

hmmm
1550 longblock shipped
300 h23 tranny
200 ecu
70 for the cv halfshaft and drivers side axle
100 new clutch
50 misc fluids...

im not doin the math - in a hurry - cya

holy damn thats pretty cheap whered ya get the longblock and thee tranny?

ummm... eBay.... got the longblock from PlanBperformance, and the tranny from a d00d who was sellin it out of his wrecked prelude