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Originally Posted by thisisntjared
this really makes me appreciate owning an eg...
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Why? Because it's more difficult to do a 5-speed conversion on them?
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Originally Posted by MetroMPG
Care to give us some background on the different gears/final drive numbers involved?
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Sure. The reason I'm doing this conversion is - (a) I love driving a 5 speed and (b) I'm hoping the longer gear ratios from the HF transmission will allow me to get more gas mileage by maintaining lower engine RPM's at constant speeds. This will help me (in theory) as > 80% of my driving is highway @ sustained speeds.
The gear ratios in my HF transmission are as follows:
1 3.250
2 1.650
3 1.033
4 0.823
5 0.694
R 3.153
FD 2.95 (non-California model)
I have verified this by counting teeth on the gear sets while I was rebuilding the transmission, but I seem to have misplaced the sheet where I wrote the actual gear teeth numbers down at.
I do not know what the gear ratios are for a 1990 Civic DX with an automatic transmission, but perhaps someone else can give insight into that (SVO?).
This will be my first time attempting the conversion, but I don't think it will be that hard after reviewing the limited information available. I still haven't decided whether or not I'm going to pull the entire engine/tranny or just the tranny. Pulling the entire setup isn't necessary (it is more work), but it will yield more room. I'll probably end up yanking the whole thing.
Basically, the parts I have collected for this conversion are: CRX HF transmission, D-series flywheel, stock Exedy replacement clutch kit, Clutch cable, engine mounts from a civic with a manual transmission, an ECU from a manual equipped civic (DPFI), and a shift linkage from a 1988 Civic with shift boot & shift knob.
I have already rebuilt the transmission with new bearings and seals. I opted not to replace the synchros for money reasons (it would have been an additional $250 for parts) and because people rarely abuse HF transmissions - I'll admit I'm taking a chance on this, but it's a calculated risk. If necessary I'll pull it back out and throw in new synchros at a later date. I have also already installed my manual pedal cluster over a year ago. It's been weird riding around with a dead pedal, especially when going from my manual 1988 Civic to this auto 1990 Civic.
It's a pretty direct swap, all in all. There is some wiring necessary for the reverse lights (on an auto, the reverse light switch is located at the shifter console, and on a manual, it is locate on the transmission) and for the park lockout. The latter is a mechanism on automatic cars that prevents the key from being removed from the ignition unless the car is in park. Wiring is simply needed to fool the car into thinking it's always in park. I will need to cut a hole in the center tunnel for the shift linkage to poke through. Eventually, I would like to acquire the proper piece of sheet metal from a manual equipped Civic and weld this in place - this will cut down drastically on road noise and wind entering the cabin, as the sheet metal has a lip that allows a rubber boot to seal the cabin.
Anyhow, sorry to be so wordy. This weekend will mainly focus on getting the tranny (or engine/tranny) out, moving the mounts around, and getting the manual transmission bolted to the engine.
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