Hondata

Hi Hondata,

I have been feeling what seems to be mis-firing issues.
My FK8 is a 2018, with G25-660 turbo, PRL exhaust, Cat back exhaust, PRL intercooler, Radiator upgrade, Hondata Fuel upgrade, etc.

After tuning and running around is fine. But I noticed mis-firing occasionally, around 5500rpm especially on a hot day (32 deg C) on track. Changed the plugs, to no avail. Looked at the data log, can't quite make sense of it.

Mis-firing, meaning like it feels like a power cut, unable to generate bhp, burbles from exhaust.

Attached datalog for your kind assistance and analysis.

Your fuel trims are high, but the problem is that the fuel system is losing fuel pressure over 5000 rpm.

If I've already have Hondata Fuel upgrade, and I'm losing fuel pressure, what could be the problem?

1. Fuel filter?
2. As everything else is supplied by Hondata Fuel Upgrade System. Did I miss any other possible (culprit) part?

Have you checked the fuel system for contamination?

Please see: https://www.civicx.com/forum/threads/us ... ion.65283/

No I haven't. I'm not on flex fuel.
Regardless, will revert upon doing so.

Hi,
Since your suggestion to check the fuel filter, I had it changed.
Did notice that there were some contaminants - but not surprising since my car has pushed past 30,000 miles already.

Change to a new fuel filter and a new low pressure fuel pump.
Re-tuned the car with 4Pistons cams on a dyno. It was great. On the Dyno, it was fine, 20 out of 20 pulls.
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BUT after driving for about 1000 miles, and 100 miles that day, the same backfire problem started again. Log attached.
I must stress the problem is intermittent - 5 out of 10 pulls on the road, I get the backfire. But it can be replicated when I get it.

a. Could the Hondata Hi Pressure Fuel Pump be acting up?
b. Heat? (Ambient was about 90 degF)

It looks like the fuel system is maxing out. You may need to try lowering the air charge to make less boost so that it does not max out.

1. When I look at the datalog. I notice that the Fuel Pressure dropping first, BEFORE the Fuel Pump Duty Cycle hits 100%.
Doesn't this indicate the High Pressure Fuel Pump is having a problem?

2. And AirC is at 224% Is that even high?

3. Also, the backfire doesn't happen all the time. I have some logs that allows a clean pull, using the same calibrations.

What is your fuel system serial number?

My fuel system serial number is 1034.

Send an email to support <at> hondata.com with the following and I will issue an RMA and give you further
instructions:

Name:
Address:
Phone:
Email:
Serial#:
Description of problem:

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