I was wondering how I could increase my hp in my 89 crx. I've already got a cold air intake and want to get more speed without a turbo or swaping the motor (although I would love to). Thx

 

Like a wise man once said, the best thing to do with a D-series is pull it out. You just can't obtain big gains/speed on a D-series without throwing serious funds at it.

 

fixed

 

dropping it out of an airplane usually does the trick

 

heh heh. That was some funny shit

Seriously though, the posts so far are right. i/h/e will get you as far as you want to go--investing any more money in your D-series is probably a waste. In general, the EF civics just aren't big powerhouses. They weren't designed to be, and those that end up being 10-second monsters do so with several thousand invested.
Now, if you're question was instead "how can I make my car more fun to drive?", then my answer is invest the couple hundred dollars it takes to get strut tower bars, front AND rear sway bars, and/or a quality suspension kit. Cars are a lot more fun when they feel like roller coasters :yes:

 

dohc zc swap with the mods you have already. That will bump it up alot more then what you have now. Oh yeah and a test pipe. You will see a big gain from that

 

If ya want to keep the D, just go look for a D16Z6 vtec head... Minime swaps are popular, and it's a good way to pick up 30 horsepower and open up a lot of other possabilities... Shit, I say go to work on the D, and prove all these other guys wrong.. peace..