What is the difference between the BMW e30 325ise and the e30 325i sport?

"There are slight changes in specification for example the gearbox but in reality the Word sport is pretty much all."

Hm, not really; they use different engines.

There is no such thing as a "325ise". There are 3 engines used in e30's; the 2.5L i I6, the 2.7e I6 (or ete, meaning economy), and the 1.8L I4. The "i" stands for fuel injected.

325is stands for 3 series, 2.5L, i, sport. The "325i sport" you referred to is called a 325is.

325i is the same car without the sports package.

The 325 or 325e are the same car, with the 2.7L eta engine. Not sure why they didn't call it a 327e.

The 318i/318is use the 1.8L 4cyl engine.

I hope that helped.