Hondata

Hello,

I have attached a data log of a cold start and how it progressively leans out as the engine/air warm up. I have also attached the calibration. Below you will find details of the engine and description of the problem.

2000 civic Si (EM1)
B16A2
800cc injectors
walbro 255
innovative wideband
3bar map sensor
GSR camshafts
hondata S300 v3
Using a stock 2001 ITR map included in S300
Purge valve bypassed/disconnected
everything after fuel pump and before injectors is stock.

All is well while warming up. I have noticed that the issues begins once the ECT compensations are at 0 and the IAT compensations are at 0 or begin to go negative as configured on the stock calibration. The only way I have been able to get around this is by modifying the IAT compensations at idle and medium load but this affects my driving AFR also.

I tried using a stock B16 P30 map also and the problem persists.

any ideas?

thanks in advance.

You have not included the calibration this datalog was made with.

my apologies. thanks for the reply to clarify. I have attached the calibration.

ITs' shard to see what is really happening since the datalog only shows it when hot, but it sounds like you just have the iat and ect compensations for fuel set so that it's not rich when cold and then when it gets hot it runs too lean. IT should be a little rich when cold and then get to the right AF when hot. This is most likely just a tuning issue. Make sure it is tuned correctly when hot, then use the compensation tables for when it is cold and warming up.

I recorded over the cold start log. I will create a new one and upload it.

This is a full stock calibration with stock compensations. it should not lean out as it is doing. no tuning has been done to the car yet.