FWIW- I had an 87 Integra that got better mileage with the smaller tires than the taller tires (I tried taller tires thinking it would improve my gearing and corrected the mpg for my speedometer being off). It seems counter intuitive, but that's what happened. I guessed that taller tires increased airflow and associated drag underneath the car and this more than offset the improved gearing. That car was geared so that the engine was turning 3500rpm at 70 mph in 5th gear!
I want to install a 1.3L carb and devac it, so, which one of these do I need to buy? Honda Carburetors
The one for a 1.3L civic and CRX 84-85? or 86-87? Whats going to be the best for devac FE? I'm looking for the type that is jetted leaner, and doesn't need an o2 sensor.
If you want the hf gearing you just need the final drive. That's all good luck with that. 10 years ago they couldnt give them away. Same with the cx/vx trans. Now. Well we all know they are getting hard to come by.
For what it's worth, my '85 CRX Si with the original EW3 (257k miles) has been inching towards a 50 mpg avg. since '05. Mods that matter:
- HF Transmission (the HF 5th in the old Si tranny wasn't enough)
- Pass. side mirror delete
- A/C delete
- 44 psi tires
- 100% lower grill block
- Not much interior (no carpet, headliner, plastic from seats back)
- Vacuum gauge
I don't go all out hypermile, never turn the car off while driving, but plenty of coasting in gear. Your goals are possible, I'm not even trying beyond mindful driving. Enjoy the ride,
'85 CRX Si Original EW3 @ 254k...suck it Detroit
'89 CRX HF-Z1 ~ When haste is needed
'97 Civic DX Hatch ~ Formerly 600hp, now 0hp, soon 115hp.
I drive an 87 crx hf. when I got it 14mo ago it was bone stock except for the si transaxle someone had swapped in. I got 46mpg with that. But I swapped in an OEM hf transaxle. RPM drastically reduced but so was power and driveability. If I keep it on flat hwy I get 52ish. My local terrain is hilly. I often have a passenger. Because of these it wasn't a big advantage for me. But could be in the right scenario.