Hondata

I have been trying to fix an issue where from a cold start, the car commands 2896.11 fuel pressure which seems to be choking the car. I get multiple cylinder misfires. If I hold the gas down during the first minute of warm up, the car does not misfire nor do I get ANY CELs. Fuel Mods below. ANyone ever seen this or have an idea what table could be commanding this? I've touched some of the FP tables already.

Stock Bottom end
Stock Head minus springs and retainers
XDI 2000cc injectors
Full Race HPFP
ID750 fuel filter
FK8TD fuel basket
Walbro 450 in tank pump

What is the FlashPro serial number?

FP-CTR-FK8-353947

Most likely the missfire codes are from the injectors. Have you talked to the manufacturer of them?

I have. They mention perhaps a table that isn't exposed and they see a "fuel status of 8" for open loop error. That doesn't make sense because there are folks with my setup using Hondata just fine unless there's specific Tuners that have the "hidden" tables on a different version not available to someone like myself. The tuners have these cars tuned won't help unless they tune it which at the moment I'm not willing to have my tune locked. XDI's response is below.



I have some feedback for you



The Fuel Pressure is following the commanded pressure and something in the tune is commanding the really high DIFP. Likely a start up table that isn't exposed in the tuning software, similar to ford where CSER mode targets high pressure on start up. But I can't see anything in the tune file that would command this pressure.



What I do see is that while the pressure is high and a little after, it is showing a fuel status of 8 which stands for open loop error. This could be a problem with the o2 sensor, but I don't see it occurring during the driving log. The reason I don't think the high pressure is the problem here is because the status of 8 continues after the pressure drops. The other thing I notice here that would definitely cause misfires is that commanded and actual AFR are both really lean at 20. I assume this is coming from some kind of cat heating related table. The inj pw is above 1ms for this period though which seems high considering how big the injectors are and how lean the afr is during that idle log.





Thanks and Best Regards



Michael Vinciguerra
Customer Support

MaikyTech478 wrote: Mon Jan 27, 2025 2:44 pm I have. They mention perhaps a table that isn't exposed and they see a "fuel status of 8" for open loop error. That doesn't make sense because there are folks with my setup using Hondata just fine unless there's specific Tuners that have the "hidden" tables on a different version not available to someone like myself. The tuners have these cars tuned won't help unless they tune it which at the moment I'm not willing to have my tune locked. XDI's response is below.

it looks like you shared a different logfile with the manufacturer because the logfile that you posted here doesn't show a fuel status 8 anywhere that I can see, also the AFR doesn't show anything but a 1.0 lambda (14.71:1)

I have to wonder what's the story with the IAT though? shortly after startup it goes from 59.0F all the way to 109F, and then plunges back down to 62.6F all in the first minute. That seems really odd when the car isn't moving. During this period your AFM.v is all over the place too. Can you post a more complete list of your mods? turbo, intake, intercooler, flexfuel, etc?

Correct, fuel status 8 didn't pop up on the first log I posted. Here is the one that I sent them. I have a new o2 on the way to test out the first theory. I did think that perhaps my MAF sensor or the one in the throttle body had gone bad as well since the IATs are read from there. I didnt want to just start throwing sensors at the car though without better reasoning.



Stock Bottom end
Stock Head minus springs and retainers
XDI 2000cc injectors
Full Race HPFP
ID750 fuel filter
FK8TD fuel basket
Walbro 450 in tank pump
PRL P700 turbo
PRL Race MAF/intake
PRL intercooler,
PRL V2 flex fuel

what do your LT and ST fuel trims look like once you start driving? will it eventually go into closed loop? do you have a log of normal driving?

And are you sure you're getting good fuel supply from the in-tank (walbro) pump?

Also, what happens if you go back to pump 93 (like 0-10% ethanol). I see you're running E50.

This is a characteristic of the spray pattern of that injector at that ethanol content.

@jeffx Here is a logged drive. I never see a fuel status 8 but the pump goes crazy from time to time.

As for as the in tank pump, she's flowing good. I have an AEM FP gauge inside the car that tracks a fluctuating 65-75psi while driving. I haven't driven long enough to get to a different fuel source.

@Hondata it should be controllable. There are tunes doing it with Hondata. Question is what are they doing to solve it?

MaikyTech478 wrote: Tue Jan 28, 2025 10:26 am @jeffx Here is a logged drive. I never see a fuel status 8 but the pump goes crazy from time to time.

As for as the in tank pump, she's flowing good. I have an AEM FP gauge inside the car that tracks a fluctuating 65-75psi while driving. I haven't driven long enough to get to a different fuel source.

@Hondata it should be controllable. There are tunes doing it with Hondata. Question is what are they doing to solve it?

Ok. If you get a chance, try running the ethanol out of the tank as much as possible and try some cold starts with regular pump gas and see if that helps. If not, then at least that could eliminate the spray pattern as being the problem.

There are no additional 'hidden' tables which can be used. You cannot compare operation running Hondata injectors with the XDI injectors are the spray patterns are completely different. I believe your approach should be to correct the closed loop operation first - fuel pressures need to be in the 15-30 bar range for it to work with those injectors, and work on getting the lambda and fuel trims within range.

jeffx wrote: Tue Jan 28, 2025 12:24 pm

MaikyTech478 wrote: Tue Jan 28, 2025 10:26 am @jeffx Here is a logged drive. I never see a fuel status 8 but the pump goes crazy from time to time.

As for as the in tank pump, she's flowing good. I have an AEM FP gauge inside the car that tracks a fluctuating 65-75psi while driving. I haven't driven long enough to get to a different fuel source.

@Hondata it should be controllable. There are tunes doing it with Hondata. Question is what are they doing to solve it?

Ok. If you get a chance, try running the ethanol out of the tank as much as possible and try some cold starts with regular pump gas and see if that helps. If not, then at least that could eliminate the spray pattern as being the problem.

The new o2 sensor gets in tomorrow so if that doesn't cure it, fuel is next. I'll report back either way.

Hondata wrote: Tue Jan 28, 2025 12:44 pm There are no additional 'hidden' tables which can be used. You cannot compare operation running Hondata injectors with the XDI injectors are the spray patterns are completely different. I believe your approach should be to correct the closed loop operation first - fuel pressures need to be in the 15-30 bar range for it to work with those injectors, and work on getting the lambda and fuel trims within range.

My apologies on not being specific. There are other FK8's running this exact injector and fuel pump with no issues. I've never tried the Hondata injectors but I do believe the spray patters would be far different.

The fuel pressures were adjusted to where they met the >.8ms required for them from idle to part throttle. All that is good. It's on startup and from 2200-2800rpms that the FP runs away on its own. I don't see any table that commands FP to be 200bar. If I drive the car aggressively, there are zero issues in that rpm range. Are you saying I need to go lower across my FP tables?