Throttle lag issues when starting from idle

[josaya]

Hi all, thanks for viewing, just picking peoples brains for any ideas.

Car: K24a3, ITR cams, ported oil pump, new chain, tensioner, seals, cleaned valves\pistons, RBB, ktuned H\E, cat
Tune: Idle 0 degree values are quite close to the stock 04-05 tsx map for fuel and cam angle, but ign at idle needs to be bumped up to 22 otherwise it would choke and sometimes die (even on stock map)

Issue: When idle, depressing the accelerator any harder than a caress causes either
1)RPM to dip a little before recovering
2)RPM lags behind throttle quite noticeably, and the quicker\deeper it is depressed, the longer the lag (up to 0.25ms)

Things I have tried:
1)calibrating TPS
2)replaced TPS, fixed slight unstable TPS voltage issue
3)adjust Tip in Fuel Stopped, currently sitting on -10,-15,-20, this improved hill starts but main issue persists
4)stock 04-05 tsx map values (ign\fuel\cam)
5)tested idle between 850 and 950 (yes I have read the pinned "Surging idle speed" post, my Duty cycle needs to be set a click or two left)

Is there some setting I've missed? Car drives quite smoothly otherwise (RL as a daily... still waiting for an ECU for that :x)

Been battling with this for 4 months now and it is driving me nuts!

Thanks

[Hondata]

It probably is not the throttle / tps. What is the lambda and ignition timing at this point?

[josaya]

Cheers for that, not exactly sure what lambda true is, but target is 13.2 and 13.

edit: that being said, I'll test https://www.hondata.com/forum/viewtopic ... IGN#p86302 out as well tomorrow if I can find what it matches to on a KPRO :O

[Bullyk20]

Cheers for that, not exactly sure what lambda true is, but target is 13.2 and 13.

edit: that being said, I'll test https://www.hondata.com/forum/viewtopic ... IGN#p86302 out as well tomorrow if I can find what it matches to on a KPRO :O

hi man, any update with the issue?

[josaya]

I installed a wideband, ran the ecu off it, and it went away....

Have since unplugged the wideband as have started running into a daughter board communication error which I'm about to enquire about.... That being said, the throttle lag hasn't returned so I'm really unsure what was the cause