Hondata

Ah crap... it is in a 2005 Acura RSX Type S. The motor WAS the original K20Z1, and was recently swapped to a DC5R K20A due to Hydrolocking the Z1.

I'm seeing wiring, grounds, and/or the Alt as a potential issues based on reading g a lot of your other replies to people.

I have tried the ECU with ...

I'm posting 3 maps.

Please log and verify on your own car!


ALL are tuned for US Spec 93oct ☆☆RON+MON/2

For you Shnurokkk, thatd be like your Shell VPower with a 99 RON number or so just as a heads up.

First is titled "Rev 6.2 ..." this is what I'm currently running and is tweaked for WINTER ...

I'm on my way home from work, will post the map ASAP...Sorry I missed these replies!

Just FYI, my mods are as follows;

Can anyone take a look at my ELD and BAT Voltage, and tell me what the hell I need to look into. I'm having major problems getting what I'd consider to be a clean AFR due to what APPERS to be either a Weak-ish alternator affecting my dead times at certain RPM/Voltage....OR as you can see me ELD is ...

Sorry I missed Spunksters reply.

I literally just did this exact swap. Willing to bet you swapped the VSS and Tach wiring as it isn't THAT hard to do lol

Spunkster wrote: Tue Jan 05, 2021 10:55 am It could have to do with the injector dead times as they are directly related to voltage.

Ok good to knkw thank you. I neglected to think of thay as im on stock Injectors, so I more or less ignore them.

Thanks for the help ill start with the Alt and voltage drop tests then go there.

It appears to be related to the battery voltages as they are different in the different gears.




Interesting. I do see the voltage going from say 13.8 down to 13.2 in steps in 3rd-4th& 5th

Whats weird is at 13.3v in 3rd... no issue. Even dipping to 13.0v at 8500rpm no change in CMMD AFR

In ...

Any guru's care to take a look at the attached Map and datalogs.....

It's a very early modified version of the Hondata included base map titled "K20a ITR, Toda, 310cc"

My initial thoughts were obviously... Hey, must be a gear compensation, but it happens in the middle of my 4th gear pull, prior to ...

With how you and the database explains that DTC is triggered in the 1st place, that has to be it. Must be looking for something like that on initialization. Thanks for the help. I'll update with result/fix.

Voltage going into the ECU, (using a T pin and multimeter for reference)

Original/"no issue" .kal - 11.7v was lowest I saw

K20a-itr basemap "comm issue .kal - 11.55v was the lowest I saw, so it was a bit lower.

Has anyone experienced an issue with only 1 map but not the other before?

Spunkster wrote: Fri Oct 16, 2020 9:31 am Post the calibration as you are using it.

BrianJewell1988 wrote: Fri Oct 16, 2020 8:08 pm The Cal with "no issues" is this one.....

k20a old motor disabled VTec oil psi switch.kal


The basemap, unedited Cal that I'm having the continuous DaughterBoard comm error and accompanying DTC/CEL is...


k20a-itr basemap.kal

I have a fully tuned map for more or less that exact setup but its a PRB... AFAIK the data points will populate in the fuel/timing/etc maps but it won't work. If you know differently let me know and I can send it your way. It's a healthy tune, 235whp on a Mustang dyno and trapped 108mph in a full ...

There is a base map provided by HONDATA for very close to this exact setup.

Under PRB->RSX Type S->"k20a-itr"

This is a dyno tuned JDM DC5R K20A map for a car with the usual I/H/E. Depending on if your running an RBC/RRC, etc ypu may be able to squeeze a bit more top end or midrange out of it but ...