7A performance

[RV7A Flyer]

RV-7A, IO-360-M1B, injected, Hartzell BA prop. 170 KTAS in the 7000-9000 MSL range, leaned to best power.

OP needs to make sure his ASI is accurate before doing anything else.

[cef737]

The engine is new and still being broke in. I have no wheel pants or gear fairings yet. The ASI seems to be accurate as I have checked the GPS ground speed
to my TAS. The engine is making good power MP 28” but RPM on takeoff is only 2650. I need to adjust that. Fuel burn is around 15gph at WOT and 2600rpm full rich at 3000-4000msl. Probably 7000DA The airplane also rolls to the right significantly. I’ve double checked A of I and sweep and they check good. My right wing had been painted but nothing else. I took this project over at 90%.

[BobTurner]

Gear and wheel fairings really work. Without them you’ll lose of order 10 knots.
Search for ‘heavy wing’. Check the vertical height of the two ailerons, they need to be exactly the same. Then move on to slight adjustments (‘pinching’) of the trailing edge.

[agent4573]

That's doesn't seem too far off if you don't have any fairings installed. The wheel pants and fairings should be good for around 10 knots, and 145 indicated at 3000 ft is equivalent to 170 true at 9k.

[Untainted123]

I went and did speed runs this afternoon, plugged them into the kitplanes spreadsheet, I have a calculated IAS correction of +3.9, so that’s part of the answer.

But I discovered something else doing research on MAP gauge calibration. Reading this thread here, I calculated that my MAP gauge should be reading 28.95 with the engine off. Turns out it’s reading a hair past 30.00 with the engine off, so I have been thinking I have been flying around at ~65% power, instead it been closer to 58-60%.

So OP, double check your manifold pressure is reading correctly, and from several other posts, just cause it’s electronic sensor or EFIS doesn’t mean it’s any more accurate or calibrated than a mechanical one.