TSX reflashed, 50lb/ft loss at 4800, leans way out at 6000

[rmpage]

Hi guys. I have a 2004 5AT TSX and got it reflashed this past summer. While I would have liked to otherwise, I was not able to get it on a dyno until just recently. The results ranged from disappointing to alarming.

Here is the PDF

Two points of interest are the HUGE torque loss (50lb/ft) around 4800 RPM (or maybe that's the 5000 RPM VTEC switchover?) and then A/F shooting to the moon (17:1) around six grand. While the power loss is disappointing, leaning out at 6000 is what really concerns me first and foremost, mainly because I've been running it this way for the past 3000 miles. Stupid me for not getting a pull sooner, I know, but I just didn't have the chance. Nothing's melted yet, and now I'm keeping the revs under 5000 just to be safe.

Now, I realize a great many things could be the cause of this, and I don't intend to imply that the reflash is necessarily the cause, but I do think it at least bears sharing here. If it's not ECU-related, I'm thinking I may have a twitchy knock sensor that's cutting fuel when things get noisy inside the block past noon on the tach. Your own speculation is also welcome.

Relevant modifications which have been performed are as follows:

• Hondata ECU reflash (duh)
• Injen CAI
• Hondata intake spacer
• Comptech 4-2-1 header
• Magnaflow high flow cat
• Fujitsubo catback

This result is from the fourth pull we did. All previous pulls were identical. A/F was measured via tailpipe sniffer for the graph, but it was corroborated via a logging OBD2 scantool as well. The 5AT was in fourth gear in tiptronic mode for the tests. IAT was about 100F and ECT between 185F and 195F. Fuel was Exxon 93 octane. Last but not least, this was conducted using a Mustang chassis dyno, which measures power using an electromagnetic field rather than inertial resistance, typically yielding 10HP or so less than a Dynojet. If I've forgotten any other variables let me know.

If anybody could shed some light on this I would greatly appreciate it.

[Hondata]

Please contact us. (ask for Doug). We have been notified of this and are just completing independant testing to verify the cause. We need to know the purchase date of your reflash.

[Razathorn]

I was reading 13s at WOT on the output side of my magnaflow high flow cat when on the input side I was seeing 11.8. Just so you know, the cat will generally make you read leaner than you are. Part of the cat's life is converting unwanted compounds into other compounds with a catalyst. Part of the output is additional o2. Granted the second stage of the cat consumes o2, but it's obviously less than is produced by the first stage.

Don't know what value you will get from that, but I figured I would mention it.

Wayne

[RSXiMUS]

You sure there isn't something wrong with their equipment? I mean you drove your car for 3000 miles with the reflash I would definitely think you would feel something was not right if indeed you lost 50ft/lbs of torque.

[rmpage]

Update: Here is a dyno result of the "fixed" reflash:

Fixed reflash

Compared to:

Faulty

Much better!