structchick...based on your last comment, I think it would be a good idea for you to dig into and understand how your company derives its rates and relates that to salary. Let me give you an example....
Let's assume you made $50,000 before you passed your PE exam. You were given an 8 percent raise or an additional $4000 per year. Assuming your salary is based on 2080 hours per year, then you got a $1.92 per hour increase in pay. You say that your company raised your billing rate by 5 times your increase. That means they raised their hourly chargeable rate for you by roughly $10 per hour. That's a nominal increase. Assuming before your increase you were being billed at $75 per hour, then the increase would take that to $85 per hour. With a labor multiplier of 3.0 (that's about the minimum for a professional services company employing a reasonable mix of professional, paraprofessional and admin people), your maximum salary for that "category" of personnel would be about $59,000 per year. Until you strive to reach the next level, that only gives you room for two more nominal salary increases before the company would be forced to require you to be promoted to a different category or stop your increases. Just facts of business.
To run an engineering business, you have to reasonably get a labor multiplier of at least 3.0. If you don't achieve that, profits will suffer, shareholder value will decrease, and the company will be forced to take fiscal action, sometimes including layoffs or cut-backs in other areas.
Your contribution should be to learn as much as possible, get your own base of clients who rely on YOU, and make yourself more valuable in the marketplace. This will impress your company and hopefully you'll be rewarded accordingly. If not, then you should move on. Do not; however, expect salary increases without a commitment on your part to progress your personal career agenda and that of the company. Prove your worth. Most engineering firms will recognize that.