H series swap questions for a 1993 accord ex auto
07-28-2018, 05:15 PM
#1
Honda-Tech Member
Thread Starter
H series swap questions for a 1993 accord ex auto
Hello, Im new to the accord chassis and hoped some experienced people could help me out. Ive owned a 94' vtec prelude for 7 years now. Long story short it was in a accident, but still runs and drives fine. I picked up a super clean 93 ex accord with a seized engine for $100 bucks! Clean inside, clean outside, good paint and strait body! Clean title and only 145k original, red interior and gold/beige outside.
I picked it up prior to my accident, and was planning on just tossing in another cheap f series and using as my commuter beater. My prelude wasnt liking being driven everyday in stop and go traffic. Driving a clutch in traffic sucks, so when a deal came up on a clean cheap auto accord it was a no brainier. So Im contemplating on just swapping my ludes engine over to the accord. If all else just until i finish my apprenticeship and having to drive rush hour traffic the next 2 years..
My lude is as follows;
- HMO H23a BT 11.5:1
- KS balance shaft delete/ 8lb flywheel / stage 2 competition clutch
- PLM tri-y header to a full custom 3" exhaust
- Euro-r intake manifold / RDX injectors / Rosko fuel rail/ aeromotive regulator / aeromotive 340 LPH fuel pump / Skunk-2 62mm TB / ingen true cold air
- Head was rebuilt with upgraded valvetrain but still stock cams
- HMO T2W4 euro-r trans
- Every form of emissions deleted / PS delete/ AC delete
- Dyno'd on Neptune data logger ecu
- Im sure im forgetting stuff, but thats the gist of it.
I dont know much about autos, so thats why Im here; I know how to do my own research, but honestly Im hoping someone can just give me a rundown.
Q-1 --- What mounts should I use? The accord has all the stock f series ones, i have innovative mounts on the prelude for H series. Im pretty sure im using the auto trans mount still, but what about the others?
Q-2 --- what axles should i use? I have brand new 4th gen H series prelude axles, but not sure if they will fit 4th gen accord hubs, or too long or short? Be nice to use the new ones for obvious reasons. Are auto and 5spd axles different?
Q-3 --- would i use the H series harness? Are auto and 5spd harnesses the same? The auto's have a secondary ecm. Will the engine ecu still be plug n' play? Or will I be stuck finding a auto H series ecu...?
Q-4 --- I know my full exhaust wont bolt strait in lol, be dope if it did! But the only header I have is the PLM, will that have issues mounting to a stock accord cat? I also have a magnaflow HF cat, but same issue of if it will mount to stock cat-back? Not sure of stock size piping for F series.
Q-5 --- Other then the flywheel, what other bits would need swapped over to make a 5spd to auto swap work? I know some people are probably going to read this and be like "wtf are you doing bro" lol. Most people want to go the other way.
Anyhow thanks for any replies in advance! I kind of think it will be a cool auto sleeper lol. I also have repowder-coated white ITR wheels on the lude right now that conveniently fit the accord as well. Too bad the slotted and dotted rotors wont swap over, kind of makes them wheels pop.
I picked it up prior to my accident, and was planning on just tossing in another cheap f series and using as my commuter beater. My prelude wasnt liking being driven everyday in stop and go traffic. Driving a clutch in traffic sucks, so when a deal came up on a clean cheap auto accord it was a no brainier. So Im contemplating on just swapping my ludes engine over to the accord. If all else just until i finish my apprenticeship and having to drive rush hour traffic the next 2 years..
My lude is as follows;
- HMO H23a BT 11.5:1
- KS balance shaft delete/ 8lb flywheel / stage 2 competition clutch
- PLM tri-y header to a full custom 3" exhaust
- Euro-r intake manifold / RDX injectors / Rosko fuel rail/ aeromotive regulator / aeromotive 340 LPH fuel pump / Skunk-2 62mm TB / ingen true cold air
- Head was rebuilt with upgraded valvetrain but still stock cams
- HMO T2W4 euro-r trans
- Every form of emissions deleted / PS delete/ AC delete
- Dyno'd on Neptune data logger ecu
- Im sure im forgetting stuff, but thats the gist of it.
I dont know much about autos, so thats why Im here; I know how to do my own research, but honestly Im hoping someone can just give me a rundown.
Q-1 --- What mounts should I use? The accord has all the stock f series ones, i have innovative mounts on the prelude for H series. Im pretty sure im using the auto trans mount still, but what about the others?
Q-2 --- what axles should i use? I have brand new 4th gen H series prelude axles, but not sure if they will fit 4th gen accord hubs, or too long or short? Be nice to use the new ones for obvious reasons. Are auto and 5spd axles different?
Q-3 --- would i use the H series harness? Are auto and 5spd harnesses the same? The auto's have a secondary ecm. Will the engine ecu still be plug n' play? Or will I be stuck finding a auto H series ecu...?
Q-4 --- I know my full exhaust wont bolt strait in lol, be dope if it did! But the only header I have is the PLM, will that have issues mounting to a stock accord cat? I also have a magnaflow HF cat, but same issue of if it will mount to stock cat-back? Not sure of stock size piping for F series.
Q-5 --- Other then the flywheel, what other bits would need swapped over to make a 5spd to auto swap work? I know some people are probably going to read this and be like "wtf are you doing bro" lol. Most people want to go the other way.
Anyhow thanks for any replies in advance! I kind of think it will be a cool auto sleeper lol. I also have repowder-coated white ITR wheels on the lude right now that conveniently fit the accord as well. Too bad the slotted and dotted rotors wont swap over, kind of makes them wheels pop.
Last edited by Sparksman; 07-28-2018 at 08:17 PM. Reason: my balls itched
07-28-2018, 11:48 PM
#2
Honda-Tech Member
Thread Starter
Re: H series swap questions for a 1993 accord ex auto
Here are a few pics, so you know im not BS'n. My lude in its prime, before the crash... 
my $100 accord!
my $100 accord!
07-29-2018, 11:42 AM
#3
Honda-Tech Member
Thread Starter
Re: H series swap questions for a 1993 accord ex auto
I happened to have some free time for once, and tried finding out what I could so far. Figured Id post my answers for future reference for people. Half the threads related to what Im doing in the FAQs on this forum and others are not working. I basically tried to read what I could on auto to 5 speed swaps, and reversed the order.
Q-1 --- What mounts should I use? The accord has all the stock f series ones, i have innovative mounts on the prelude for H series. Im pretty sure im using the auto trans mount still, but what about the others?
A-1 --- As from what I can tell you either need to weld a 5spd hanger bracket off the chassis, or hasports makes some sort of conversion mount if you dont have a welder. Since Im switching to a auto chassis, the mount hanger is stock. So I will use the auto trans mount for the right *side. The front you have to use the accord mount and bracket. The rear you can use either accord or 92-96 prelude, from what ive read prelude stuff is more stout. Just cant mix and match, either all rear accord mount or vice versa. The left* side mount from what I can see seems could be used with both? But With the stock f series or H series, mounting takes "tweaking / slight modification" to have sit in there perfect.
Q-2 --- what axles should i use? I have brand new 4th gen H series prelude axles, but not sure if they will fit 4th gen accord hubs, or too long or short? Be nice to use the new ones for obvious reasons. Are auto and 5spd axles different?
A-2 -- Yes auto and 5spd axles are different as far as ive read, so I will be using stock f series axles that came with the car. "which are not that old, I have some maintenance records for it."
Q-3 --- would i use the H series harness? Are auto and 5spd harnesses the same? The auto's have a secondary ecm. Will the engine ecu still be plug n' play? Or will I be stuck finding a auto H series ecu...?
A-3 --- Yes I will have to use the auto trans harness. The tcm splices into the needed info to shift correctly. The engine ecu can be a tuned/ chipped ecu. I read on some Neptune boards of people boosting automatics. So i will be able to run my chipped, and tuned ecu while automatic. From what i did read is some civic ecu's will cause the D4 light to flash. They recommended a P75 to prevent this? I have a obd1 non vtec ecu originally. So its a P74 or P75. Hoping I will be good. Didnt matter, still drove just flashed the light.
Q-4 --- I know my full exhaust wont bolt strait in lol, be dope if it did! But the only header I have is the PLM, will that have issues mounting to a stock accord cat? I also have a magnaflow HF cat, but same issue of if it will mount to stock cat-back? Not sure of stock size piping for F series.
A-4 -- From what ive read the factory manifold and down pipe on a h series should line up and matt with the stock accord cat-back. Im still not sure if my aftermarket header or HF cat will because it is 2.5 inches. Havent been able to find stock pipe diameter yet for the 4th gen accord.
Q-5 --- Other then the flywheel, what other bits would need swapped over to make a 5spd to auto swap work? I know some people are probably going to read this and be like "wtf are you doing bro" lol. Most people want to go the other way.
A-5 --- Other then the flywheel, the starters are different as well. I will just use the f series starter then
Q-6 --- Would anyone have any suggestions on what I should do about the MAP? It looks as if the MAP is on the TB, and not the firewall like my lude. I read you should get a firewall MAP of of a early 90's civic DX because it doesnt have some features the prelude one does. But didnt go into more detail then that... Would be convenient to just use the stock one off of my 94 vtec lude.
Q-7 --- The links in the FAQs regarding brake swaps was not working. Has anyone here have experience doing rotor and caliper swaps on a 4th gen? Sounds like my prelude stuff is pretty much a strait bolt on. But i didnt want to swap front hubs because ball joints are toast on the lude. Would have to buy new ones and have pressed before id put on the accord.
Q-8 -- Is there anything i should do to the auto trans while I have it out? Any service tips, things I wouldnt think to do having never worked on a auto to this degree.
Im hoping to keep this as close to a free swap as I can get lol. Between these two cars Im hoping to have everything needed, and id like to bust out in one weekend.
Q-1 --- What mounts should I use? The accord has all the stock f series ones, i have innovative mounts on the prelude for H series. Im pretty sure im using the auto trans mount still, but what about the others?
A-1 --- As from what I can tell you either need to weld a 5spd hanger bracket off the chassis, or hasports makes some sort of conversion mount if you dont have a welder. Since Im switching to a auto chassis, the mount hanger is stock. So I will use the auto trans mount for the right *side. The front you have to use the accord mount and bracket. The rear you can use either accord or 92-96 prelude, from what ive read prelude stuff is more stout. Just cant mix and match, either all rear accord mount or vice versa. The left* side mount from what I can see seems could be used with both? But With the stock f series or H series, mounting takes "tweaking / slight modification" to have sit in there perfect.
Q-2 --- what axles should i use? I have brand new 4th gen H series prelude axles, but not sure if they will fit 4th gen accord hubs, or too long or short? Be nice to use the new ones for obvious reasons. Are auto and 5spd axles different?
A-2 -- Yes auto and 5spd axles are different as far as ive read, so I will be using stock f series axles that came with the car. "which are not that old, I have some maintenance records for it."
Q-3 --- would i use the H series harness? Are auto and 5spd harnesses the same? The auto's have a secondary ecm. Will the engine ecu still be plug n' play? Or will I be stuck finding a auto H series ecu...?
A-3 --- Yes I will have to use the auto trans harness. The tcm splices into the needed info to shift correctly. The engine ecu can be a tuned/ chipped ecu. I read on some Neptune boards of people boosting automatics. So i will be able to run my chipped, and tuned ecu while automatic. From what i did read is some civic ecu's will cause the D4 light to flash. They recommended a P75 to prevent this? I have a obd1 non vtec ecu originally. So its a P74 or P75. Hoping I will be good. Didnt matter, still drove just flashed the light.
Q-4 --- I know my full exhaust wont bolt strait in lol, be dope if it did! But the only header I have is the PLM, will that have issues mounting to a stock accord cat? I also have a magnaflow HF cat, but same issue of if it will mount to stock cat-back? Not sure of stock size piping for F series.
A-4 -- From what ive read the factory manifold and down pipe on a h series should line up and matt with the stock accord cat-back. Im still not sure if my aftermarket header or HF cat will because it is 2.5 inches. Havent been able to find stock pipe diameter yet for the 4th gen accord.
Q-5 --- Other then the flywheel, what other bits would need swapped over to make a 5spd to auto swap work? I know some people are probably going to read this and be like "wtf are you doing bro" lol. Most people want to go the other way.
A-5 --- Other then the flywheel, the starters are different as well. I will just use the f series starter then
Q-6 --- Would anyone have any suggestions on what I should do about the MAP? It looks as if the MAP is on the TB, and not the firewall like my lude. I read you should get a firewall MAP of of a early 90's civic DX because it doesnt have some features the prelude one does. But didnt go into more detail then that... Would be convenient to just use the stock one off of my 94 vtec lude.
Q-7 --- The links in the FAQs regarding brake swaps was not working. Has anyone here have experience doing rotor and caliper swaps on a 4th gen? Sounds like my prelude stuff is pretty much a strait bolt on. But i didnt want to swap front hubs because ball joints are toast on the lude. Would have to buy new ones and have pressed before id put on the accord.
Q-8 -- Is there anything i should do to the auto trans while I have it out? Any service tips, things I wouldnt think to do having never worked on a auto to this degree.
Im hoping to keep this as close to a free swap as I can get lol. Between these two cars Im hoping to have everything needed, and id like to bust out in one weekend.
Last edited by Sparksman; 07-29-2018 at 01:23 PM.
07-29-2018, 01:34 PM
#4
Re: H series swap questions for a 1993 accord ex auto
there's a lot of info on this, you just have to do some searches
but if you don't have smog check where you live you can use your auto tranny with a jdm p13 auto ecu and your existing auto tranny and tcm instead of having to swap to manual
but if you don't have smog check where you live you can use your auto tranny with a jdm p13 auto ecu and your existing auto tranny and tcm instead of having to swap to manual
07-29-2018, 02:05 PM
#5
Honda-Tech Member
Thread Starter
Re: H series swap questions for a 1993 accord ex auto
I was on neptunes forum and read that I can just use my current chipped ecu with the current auto trans and tcm. I do have smog, but in WA at least you are allowed to have your laptop connected to the ecu while testing. Only way i got the prelude through. Just slowly leaned it out until it passed lol. Which im stoked about, cause if i couldnt use my current ecu i would have to get new injectors and a resistor box as well. They recommend a P75 so the D4 light doesnt flash. But other then that it still drives fine even if it does. I believe i have a P74 or P75 so i think im good anyways.
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