Ok i have a 91 crx Dx, (d15b2) I only know of the DX, And Si because SI came with multi point. But i see theres the HF, Ef. Whats the difference in those from the dx and si? Sorry noob question, but only ever dealt and worked on dx and si. Just always bugged me not knowing.

 

About 30+HP

 

The hf model is actually the crx "economy" platform. It came with a 70hp engine that got great gas mileage. The HF is also mpfi. The hatchback also came in a standard model that had a 70hp dpfi engine.

EF is the chassis code for the jdm 88-91 civic/crx
ED is the chassis code for the usdm 88-91 civic/crx
EE is the chassis code for the edm 88-91 civic/crx

 

This has been discussed many many times, I'm sure that if you search it will come up.

EDIT: Actually I was a little bored and was looking through the FAQ section...Wow low and behold, look what came up.
https://honda-tech.com/zerothread?id=650219