a quick question i own a s2 rx7 with a s5 turbo conversion done to it? ok so i blew one engine up already? and have just put my new on in yestarday when out driving last night i raced a car and when i hit second gear it started to die got haome checked the plugs leads replaced them compression seems alright but when you start getting up it it feels very quick still i dont know how the fuel injectors wrk on these could it be a blocked injector maybe? there is only a slight bit of black smoke coming out? can some one help please

 

do you have an a/f gauge? sounds like you are running rich. also what are you boosting at? is it stock boost?