I noticed this weekend that my 85NA has a slight hesitation when I accelerate moderately or hard through 2700/2800. It feels fine below and pulls very hard above but there is a definite yet slight hesitation there. She runs strong in every other way.
The same engine, and damn near everything else, didn't ever do this in my 84. I swapped the 85ECU out and inserted my 84NA Nisutune and stock 84NA ECUs. That made no difference.
The only difference now is that I have an L&P plenum, ported lower and Jason's phenolic spacer.
The only thing I can think of is that given the difference in air flow with the above parts I am getting some sort of flow irregularity at that rpm or the ECU maps just arent handling the air at that rpm for some reason. Once I get the turbo injectors here and start tuning I should be able to correct an issue like that but at this point is 100% speculation if that is even the problem.
O2, MAF, TPS, all the sensors came over from the 84 which didn't have this hesitation.
The same engine, and damn near everything else, didn't ever do this in my 84. I swapped the 85ECU out and inserted my 84NA Nisutune and stock 84NA ECUs. That made no difference.
The only difference now is that I have an L&P plenum, ported lower and Jason's phenolic spacer.
The only thing I can think of is that given the difference in air flow with the above parts I am getting some sort of flow irregularity at that rpm or the ECU maps just arent handling the air at that rpm for some reason. Once I get the turbo injectors here and start tuning I should be able to correct an issue like that but at this point is 100% speculation if that is even the problem.
O2, MAF, TPS, all the sensors came over from the 84 which didn't have this hesitation.
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