Anybody dyno their X5 50i or link to a sheet ?

[onfireX5]

Not much dyno info on the net.

[onfireX5]

N63 in blue 50i prior to 2014

N63tu in red 50i 2014,15,16 in X5

Dyno is a 550i. Same engine different platform.

[onfireX5]

Another stock n63tu vs a tune dyno.

[onfireX5]

Found one stock X5M vs X5M tuned.

Stock i50 = 402rwhp 450rwtq

Stock X5m = 493rwhp 499rwtq

Both are very impressive.

Tuned i50 gets very close to the X5m

Tuned X5m is insane power.

[onfireX5]

Dinan 50i engine hp curve and tune curve.

[onfireX5]

Factory 50i engine hp curve.

[onfireX5]

Factory X5M engine hp curve. Magic of 22psi vs 16psi.

[42pilot]

Sorry, but all these charts, except for the BMW chart, are bullshit. There are so many other parameters you need to identify to get a COMPARABLE chart, and none of these show them. Things like environmental factors, fuel type, correction factors (which EVERY chip maker plays with), which gear, engine or chassis, and so on. At least some of these charts use RPM and one even shows AFRs - very helpful.

I also call total bullshit to the runs that don't follow the stock torque plateau that BMW advertises - it is well known the plateau is there from the factory and even there after you install a chip like RaceChip, both for gas and diesel. If they really ran a before and after (stock vs chip/tune), why doesn't it, at least, show similar results to the factory? At least Dinan shows something very close, so I am inclined to pay attention to them.

Lastly, Dynojet is an inertial dyno using the wheels to spin up a weighted drum. If you want the most accurate reading, you need to use a dyno that applies resistance during the early stages of the run. We called them Dynojunk, but they do serve a purpose during certain types of engine tuning.

I can't count the number of guys who brought me their cars thinking they produced xxx hp because of the factory or a super tuner chip/guy, only to see 60% of their expectation show on a real dyno - like DTS (now SuperFlow).

Use these to look for anomalies. You can't even look at these for the increase from stock to a chipped engine because you don't know if the engine started at the same operating parameters (oil and coolant temp, humidity, air flow, intake air temps, and you get the idea). They might have, but you don't know with these charts. Lastly, was the dyno sitting inside a garage with big ass fans on the car? If so, the runs are skewed since BMW uses sensors for speed and relative air speed to develop power. BMW is quick to de-tune due to engine life, warranty, liability issues.

Sorry for the rant.

[onfireX5]

Totally agree with the "rant". I only use retarder dyno's on the turbo cars that I tune. "Usually" can't get the proper load for the boost curve on inertia dyno's. DynoDynamics used to be my favorite until I used a Land and Sea (Dynomite) 1500hp Klam retarder hub dyno. Takes the tire slip totally out of the equation and the software package is very good. Nothing better than holding 24psi of 1200rwhp static at 6500rpm !

If you look at the BMW torque curve above, they are using the boost curve to max the tq they want. The above dyno's are not loading the same. But they are what they are.

Airflow is a totally different animal with the new ecm's. A big problem for the normal shops to handle.

[42pilot]

Originally Posted by onfireX5

Totally agree with the "rant". I only use retarder dyno's on the turbo cars that I tune. "Usually" can't get the proper load for the boost curve on inertia dyno's. DynoDynamics used to be my favorite until I used a Land and Sea (Dynomite) 1500hp Klam retarder hub dyno. Takes the tire slip totally out of the equation and the software package is very good. Nothing better than holding 24psi of 1200rwhp static at 6500rpm !

If you look at the BMW torque curve above, they are using the boost curve to max the tq they want. The above dyno's are not loading the same. But they are what they are.

Airflow is a totally different animal with the new ecm's. A big problem for the normal shops to handle.

Nice. Don't even get me started on ass-dynos.

10+ years of turbo Porsche building/restoring/hot rodding/EFI conversions. You?

Welcome to the forum.

[onfireX5]

Thanks.

Started with carbs and dizzy in the 70's.

Won't touch a foreign tune. Too complicated. Hats off to your Porsche tuning. I'll do 411's with EFI Live or HPT or stand a lone like BS3.

Stripped my street car down to the frame and built a TT with my tune from scratch. DD is a X5 50

My driver :

[42pilot]

That is awesome - nice driving too.

This was mine but sold it to a guy in Norway. Yep, Norway. Bought it sight unseen:

http://www.brookstonefarms.com/930.html

Painted, built, converted, tuned and driven by me. Top speed at Road Atlanta and VIR was 167 but I had low gears due to 4sp. Taller R&P would get me 181mph. But like you, it was how fast I got to top speed but unlike you, I could stop in 150 ft from speed. I could make grown men squeal turning into turn 10A at Road Atlanta.

Glad to have another motorhead on the list.

[onfireX5]

Very, very, very impressive build. Ironically you used my favorite turbo. GT3582r. Wonderful spool time and killer power. Well done !