Hondata

Have P28 with S300, JDM b18C wiseco 9:1 pistons, eagle rods, precision 5831e, log manifold, 2.5" dp and exhaust, tial f38 with 11lb spring connected to vacuum manifold direct, id1000s, M&W pro 10 with crane 92n coil gapped BKR8EIX at 0.27"

. Was running E85 and switched back to 91 and there is a pretty bad hesitation around 4500-5000rpms, sometimes it can make it to 5300rpms.

I tried moving the VTEC engagement point and it did not seem to affect this issue. I am aware its very rich when boosting and i keep lowering the fuel in those cells little by little, but seems like the issue has not changed.

Any help you could provide would be much appreciated.

iam having the same problem does yours only do it for a few seconds then rev fine

I just let off gas when it happends. Seemed better when i had the 16psi spring in, now i have the 11psi spring. Its right when VTEC kicks in it just jumps in and out of VTEC hesistating.

Your tps doesn’t look like it is working

I just checked that graph i see what you are saying, i think when the hesitation happens i let off the gas completely maybe. I just checked the range it seems smooth, wonder if it could be it getting warm though? weird

Ill try a spare one i have, the one installed on there is aftermarket and unknown brand or age.

Changed TPS out with another, verified calibration. Same hesitation. Bummer..

Your air fuel is richer than 10:1 in places. That is the problem.

Hondata wrote: Fri Dec 27, 2019 12:51 pm Your air fuel is richer than 10:1 in places. That is the problem.

You were right, had to end up taking 17% out of all secondary fuelmap.