FVD ECU FLASH results

[2K3_Boxster_S]

Originally Posted by Johnny Danger

I have a nasty suspicion its those NHP headers.

Re-think, what you just said. As soon as the car is re-flashed back to stock file the car runs fine. Those nasty NHP headers help make an overall bolt on HP gain of 18 HP. That comment makes no sense whatsoever.

[Johnny Danger]

Originally Posted by 2K3_Boxster_S

Re-think, what you just said. As soon as the car is re-flashed back to stock file the car runs fine. Those nasty NHP headers help make an overall bolt on HP gain of 18 HP. That comment makes no sense whatsoever.

I know a few people who have had issues with those headers and cats. Namely, ongoing problems with CELS, and in some instances a loss of back pressure as compared to the oem set-up. Nevertheless, was FVD made aware of the fact that you are using those headers and cats ? And, were they sure to have written the software to accommodate these changes in equipment. Especially given the fact that you are now using 200 cell cats.

[landrovered]

The only part of the post combustion cycle of the engine that enters into the ECU EFI functions are the o2 sensors. The ECU does not care how quickly the exhaust gasses leave the cylinder, only the completeness of the combustion and the effectiveness of the cat. The MAF would reflect and correct for the greater flow through of the engine and the pulse width of the injectors would be set according to the fuel curves.

In short, headers not being taken into account would not cause the sort of problems the OP is describing.

[Johnny Danger]

Originally Posted by landrovered

The only part of the post combustion cycle of the engine that enters into the ECU EFI functions are the o2 sensors. The ECU does not care how quickly the exhaust gasses leave the cylinder, only the completeness of the combustion and the effectiveness of the cat. The MAF would reflect and correct for the greater flow through of the engine and the pulse width of the injectors would be set according to the fuel curves.

In short, headers not being taken into account would not cause the sort of problems the OP is describing.

You have provided an excellent answer to the question. However, if the MAF is not properly correcting air flow and fuel mixture due to a change in headers and cats, even if this is occurring on a low detection level, is it possible that re-mapping the ECU to increase these mixtures can exacerbate the problem ?

[landrovered]

Sure an improper curve can have an effect on the efficiency of the engine but...

The pulse width is the only real tool that determines the richness/weakness of the combustion mixture.

Now, headers could have the kind of effect you are suggesting if the pulse width was already at the edge of the rich or lean curve area and the headers had the effect of pushing the setting over the edge in either direction.

But I cannot imagine that the pulse width would not be set closer to the center of the band to ensure a good mixture and it would likely be set to the rich end to avoid predetonation and micro overheating associated with a too lean a mixture.

It may be the case but I do not think the headers can the cause of the entire problem.

[blinkwatt]

From what I understand and what I have spoken to w/ Rhoda about FVD,they don't even make their own flash....

[Johnny Danger]

Originally Posted by blinkwatt

From what I understand and what I have spoken to w/ Rhoda about FVD,they don't even make their own flash....

FVD has their own affiliate in Germany who does their ECU programming for them.

[2K3_Boxster_S]

Originally Posted by Johnny Danger

Nevertheless, was FVD made aware of the fact that you are using those headers and cats ? And, were they sure to have written the software to accommodate these changes in equipment. Especially given the fact that you are now using 200 cell cats.

Yes, obviously they were informed of my entire set-up. If you were at all familar with how FVD works you should know they wouldn't even send you a file without this information. You have to have an active internet connection to flash your ECU which validates your VIN and also sends your stock ecu file to them at which time you specify your mods and what redline RPM you prefer as well as whether or not you want a Top speed limiter removed etc.

[2K3_Boxster_S]

Also,

on a side note. on the first tuned file that resulted in negative HP and TQ gains the AFR's improved over the stock readings to idealy perfect.

[2K3_Boxster_S]

FVD is willing to continue working with different files for my car. I have chosen to give it up. It is just not working with something in my setup. MANY people have had positive results with this flash and I do not want to discourage anyone from trying this software. The re-mapped E throttle response and raised rev-limiter worked fine.

FVD issued me a full refund at my request.

FVD's Customer care is A+ and one of the best I have dealt with. I will continue to do business with this company, as I have 2 orders placed with them right now.


FVD Brombacher
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