I recently just rebuilt my 13b and it has an acceleration issue at 4 grand. I have tried everything I can think of to try and get rid of the studdering and hesitation when accelerating. When revving to about 4 grand the studder occurs and the car won't go above 5 grand even floored. I pulled the spark plugs and they are black from burnt fuel I presume. The only 2 things I can think of that could be wrong is that my furl/air ratios are off and its way too rich, or my timing is off. I will be getting my friend to come over and fix my laptop connection issue to the microtech ecu today or tomorrow. Do you guys have any ideas as t why my 13b is doing this??? BTW, I have a 13b cosmo TT in a vw bug. My thread is on the "other rotary" part of the forum.

 

sounds real rich and like its goin into limp mode.

 

limp mode only works with the stock engine control system, which he is not using. but i agree with an overly rich condition.