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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHBefore/After Dyno Data for ECU Flash - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Leading reported evidence
Use apexi safc
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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Before/After Dyno Data for ECU Flash - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Use apexi safc' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace are so marginal as' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed · Original poster
I used an off the shelf 93 octane flash from a popular tuner.
Before/After Dyno Data for ECU Flash - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace are so marginal as
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Suggestion
Most other changes are so marginal as to not be cost effective in a road car.
Before/After Dyno Data for ECU Flash - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Run '
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Suggestion
I should have done a 'partial open run', but I didn't.
Before/After Dyno Data for ECU Flash - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Coverage and how to read this overview
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6 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
986Forum: 1 discussions
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Generation: 20261027T003124Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I spent a lot of time searching for whp and torque data that objectively isolates the impact of an ECU flash on a 2.7L 986 Boxster. I wanted the same car, same dyno, similar ambient conditions with the only variable being the flash. Finding a clean independently verified AB comparison has proven impossible so I decided earlier this year to do my own. I used an off the shelf 93 octane flash from a popular tuner. It's the same dynojet dyno and operator, similar ambient conditions. The only mod present in both tests is racing headers with open exhaust. Everything else is stock and there are no changes to the car between tests except the flash. Ignore the vertical line which is a slider that, of course, doesn't work in the post.
In the overlay baseline is red and flashed blue. Note that the dip just before 5K rpm is the variocam.
Change 2 variables and how would you know what the effect of one change was?
You want a real difference, invest in displacement. Most other changes are so marginal as to not be cost effective in a road car.
Liam985 - thanks for taking the time to do this.
It certainly validates the thesis that Porsche didn’t leave a lot on the table with how these engines were designed and built. There is certainly power to be made, but a quick flash won’t unlock it.
Out of curiosity, did you revert back to the factory tune at the end of the day?
Regards,
Very cool. Thank you for sharing. I have also been tempted by the siren song of tuning.
Either way, it looks like you are making good whp with your exhaust setup. 👍 I think the 3.2 is usually 224ish whp. So you’d closed the gap a bit.
Funny you should post this today, I just dyno tested mine yesterday. I posted in a different thread, but here is what I posted:
In my setup I have the following:
Intake side:
- 987 airbox
- 987 BMC filter
- 987 intake tube and MAF
- 45 degree elbow
- 997 throttle body (74mm I think?)
- 987 modified distribution tube
- 996 plenum and runners
Exhaust side:
- 996 equal length headers
- 2 inch stainless tubes
- 2 inch high flow cats
- 2 inch valved mufflers
Other mods:
- AC delete
- Electric PS conversion
- Underdrive pulley
For tuning I am using an ApexI SAFC. AT WOT, my AFR is around 11:1 (logged with an AEM wideband), so I need to adjust that, but it's better to be rich than lean.
Here is the chart, blue is mufflers fully open, red is mufflers fully closed. I should have done a 'partial open run', but I didn't.
I'm pretty happy with the results, I'm basically at crank power, to the wheels. Without doing a lot more very invasive mods, aside from tuning the AFR, I don't think there is much more I can get out of this thing.
This is a source reference. Confirm exact model applicability in the original material.
