You cant change the spring rate of a spring you have to buy an all new spring with a specific spring rate.
You keep using the word cheap and its not a good frame of mind. Dont go buying the cheapest set you can find save up and buy what you want so a few months down the road you arent wishing you bought another spring set and waste your money doing so. For your purposes you couldnt go wrong with a set of generic rated GC coilovers or Skunk2 coilovers. You can pick them up for around $250 or more depending on where you look. Just do it right the first time.

 

I had Neuspeed Race springs with Tokico Blues shocks on my 90 CRX Si for about 8 months. I didnt like em too much. The ride height seemed a bit high and the springs were alittle too soft. Handling wasnt great and the ride was kinda bouncy.

I later figured that I needed a stiffer spring. So I went with generic APC coil overs. And that was about the worst thing I could have done. They are currently on my CRX and the springs are way too stiff. Ride height is cool since I can adjust it but ride quality is pretty much shitty. I like the tight handling but when I hit a bump the springs barely move so my car takes all the shock...my CDs skip my glove box pops open...it sucks. So when my car is running again soon I will be probably be getting some GC coilovers or some Eibach springs.

Mike.

 

Will they fit a 1990 CRX Si?
How much you looking to get?

BTW I think I saw you driving on Bruce B. Downs...in the New Tampa area...heading north near Olsen Tire. You looked over at me I think. I was in a white 94 Civic Hatch with clear side markers stock CRX rims. It was about a week ago. Just though Id mention it.

Mike.

 

those eibachs wont work on the crx jesse. tried it once already and the rex didnt drop an inch. but the eibachs are a great spring but now a days just about all of them are great so just find a name brand with a decent price and scoop some up.