Thanks in advance for the help, this is my first forum post ever and y'all seem very helpful. Ive owned several vehicles and have followed different forums associated, as i owned them. The EF/CRX community is BY FAR the most helpful and active. But the parts support for these cars is unreal, we can get anything you could ever thing of, why i didn't make the jump earlier is something I've been asking myself. i made up for lost time by immediately buying 2 EF hatches, a 90 and a 91.
A little back story so you know why i want to do what i want to do. I currently own a 1991 Accord cb7 that is built right from front to back, ive got over $20k in receipts and paperwork from original builder in 2013(less than 10k miles). ive put 3k miles on car since i got it through trade and it has been the most fun, reliable, and fast car ive ever owned, it is dyno'd at 472whp on race gas at 22psi, set up on a pump gas street tune right now with 9psi at 385whp. ive always wanted a built EF hatch and i was able to buy 2 last week so i did, what i want to do is swap EVERYTHING from the accord to the EF. I'm talking wiring harness, fuse box if needed, gauges, cooling system, Engine, trans, turbo, whatever i need. Its a perfectly running and driving vehicle and it would be going in an EF that is completely stripped down. The civic getting the transplant, as its more than just a swap, was in the process of being torn down for a K swap but life happened and the guy had to sell fast so got it cheap cheap. Not 30 min after buying it i was browsing FB marketplace looking for wheels for it and ran across a 90 EF hatch with no title but a nice complete car. So the point of this post is to document my build and to ask/get help from you guys with more EF experience. I have a lot of car experience and other hondas but never specifically an EF. the Accord was already built when acquired and very well known on cb7tuner.com, it has been in Super Street. for this reason ive never felt like it is truly mine and can't say that "i built it". For this reason and the fact ive always wanted to build an EF, ive decided to do this transplant. What i know so far is that ill need new motor mounts, and i know i can use H series swap mounts. ive got this extra parts car for any wiring or computer i need and since accord is a perfectly running car now, i should have everything i need for swap. i have searched a lot of swap threads but never a full transplant so if anyone has done this and has any pointers let me know, and ill update post as the project moves forward. time frame wise, i want to have this done by the end of may so i can wrap it and take it to shows and races this summer.
here is link to the build thread on the accord that will be donor car : http://www.cb7tuner.com/vbb/showthre...&threadid=2847

here is list of mods:
ENGINE

Bottom End
• F22B1 Golden Eagle Sleeved Block
• 87mm Arias F22 pistons
• Crower H23 rods
• ARP rod bolts
• ARP main studs
• ARP headstuds
• ACL main/rod bearings
• TOGA high volume oil pump
• Kaizen Speed balance shaft elimination kit

Head
• F22a4 Sohc Non-Vtec Head
• Bisimoto Engineering Stg 1.2 Cam
• Bisimoto Engineering Adjustable Cam Gear
• Bisimoto Engineering Valvesprings

Turbo Setup
• Custom Mini-Ram Manifold
• Precision GT3076R
• Fast-Turbo Oil Line Kit
• Fast-Turbo vaccum block kit
• Tial 38mm wastegate
• Synapse Engineering Synchronic BOV
• AEM Boost sensor (boost by gear)
• Allstar Performance catch can
• GM 3 bar map sensor

Fuel
• AEM High Volume Fuel Rail
• Fast-Turbo Fuel braided line kit
• Aeromotive FPR w/ gauge
• Precision 1000cc Injectors
• Aeromotive 340lph fuel pump

Chargepipes/Intake
• PBTuning 74mm Throttle Body
• H23 intake manifold, IAB plate removed, gutted
• KMS EGR block off plate
• Bisimoto Engineering heat-shielding intake manifold gasket
• 3" chargepipes
• 3" K&N Air Intake Filter
• FMIC , 3" core, backdoor inlet, 3" outlet

Ignition / Cooling
• MSD 6a ignition
• MSD cap
• MSD Blaster SS Coil
• Trigger Box / Ignitor eliminated
• NGK V-power R5672a-8 3 step colder plugs
• Aluminum Dual Core Half-Radiator
• Flex-A-Lite electric fan
• 170-degree Thermostat

TRANSMISSION

• Automatic-to-manual conversion
• Quaife LSD
• H22a M2A4 tranny
• Drive Shaft Shop lvl 2.9 axles
• Legal Speed Designs 6 Puck Clutch
• Legal Speed Designs Dragger Pressure Plate
• Forbidden Motorsports BB4 Prelude Short throw shifter

EXHAUST

• 3" downpipe
• 3" flexpipe
• 3" KTeller stainless steel exhaust
• 3" Vibrant Stealth dual-tip Exhaust

 

damn this is one hell of a parts list, can't wait to see progress pics!

 

 

It might seem like a good idea to swap 'everything' across to the EF, but the reality is that it'll be far easier to keep the under dash/cabin wiring in the EF and just run a conversion harness between whatever ECU and fuel management the CB is using and the EF's cabin harness.

The problem would be splicing the EF's functions into the CB wiring. For example, you can put the CB fuse box into the EF, but the wires that go to your dash (cluster operation / warning lights / clock / radio / lights etc) your doors (power windows / central locking / speakers etc) will not be the same. Or the same length. So even if you depin and repin (assuming they use the same pins) you might still need to cut and lengthen in areas. In some instances the circuits will not run the same way, so you can't use the hazard light switch from an EF on a CB harnes because of the input pins and what they do. In this case you would have to rewire the CB harness to make it similar to the EF harness (defeating the purpose). It's possible, but just not the easiest solution.

It takes a lot of time and effort fine tuning a project to work reliably, seems a shame to pull apart a well sorted build such as that CB.