HOW TO GET MORE POWER FROM YOUR BMW M550i [WITHOUT UNLOCKING THE ECU!]

[@Jason-BMWM5]

How is the air/fuel ratio affected? What are the AFR's stock, and with the tunes?

[@RegalAutosport]

All looked to be reading within what we'd expect to see

[@rohanw1989]

I know it's a m lite but would have thought it would make atleast 535-540bhp as BMW usually understate their bhp. As BMW claim 523bhp (530ps) for this car.

[@RegalAutosport]

Fair! It makes what it makes on the dyno, we don't fudge any numbers to make it sit at what they quote. The numbers to pay attention to though is the delta

[@stadiondude]

Isn’t that measured on the engine off factory and this was a measurement run on the wheels? 421 hp is roughly (535 - 20%)= 428 . Incalculated a rough gain of 15,5% post the race chip. So that would give this car roughly 535+1,155= 618 HP. Still underpowered if you ask me. But humor me for a second and let’s guess that that day there was a lower octane fuel in the car. That would explain everything without going overboard with mentioning alternative reasons why.

[@281shaker]

@@stadiondude At the 4:00 mark he says it measured 521 HP at the wheels. Though I agree with your other points. Based on the 521 HP measured number, we can then calculate 521/.80 =651.25. Though I find that number hard to fathom. I suspect this dyno is very optimistic. Mustang Dynos seem more realistic and often measure around 460 for these M550s. Which is still calculated out to be ~575 at the crank.

[@JOHNDELGADO2024jdtrading]

where in Scandinavia do you send the ECU if you want to wait???

[@RegalAutosport]

FEMTO

[@Bl4ck__Bull3t]

They are tuned friendly doesn’t affect your warranty

[@RegalAutosport]

Thanks!

[@trollmastermike52845]

My bmw dealership told me any thing changed other than oem for the model breaks warranty

[@bull00market]

What exhaust tips are on those? Full exhaust or just quad tips?

[@RegalAutosport]

Particulate filter back and quad tips!

[@bull00market]

@@RegalAutosport who makes quad tips? Thx

[@jperforms_5414]

would you still be able to get an ecu tune while still having the race chip connected to the car?

[@RegalAutosport]

There would be no benefit of this, and we would not reccomend it.

[@NigelDRealest]

What level did you have the Racehip on? 1 - 7

[@RegalAutosport]

Sorry, we did not record

[@BaddestTrader]

do you have this on your car what level so you have your on?

[@anasessa4814]

what color of that car?

[@RegalAutosport]

Not sure, sorry!

[@Chris-jt4ux]

Bye bye warranty......

[@RegalAutosport]

Gotta pay to play

[@zoranbutcher3466]

@@RegalAutosport does it though? if you remove the device, who would know it was ever installed? or does the ECU record something in the background?

[@KingRen420]

This is wrong actually. Just reflash it and 99% of the time they aint digging to see if u have a tune dude lol

[@zoranbutcher3466]

@@KingRen420 opinions are like arseholes everyone’s got one…wasn’t talking to you was I keyboard hero

[@technicalnonsense]

There's always a risk whenever you run a car outside factory spec. Generally these engines have been pretty reliable and these piggyback tunes are aggressive enough to cause harm to the engine. The transmission however may be a different story Although from what I was told it's very unlikely that the dealership will be able to detect these piggyback tune because they sit behind the DME although it's not impossible if they dig deep enough. At the end of the day it's the end user's choice whether they want to have more power at the risk of a higher chance of powertrain failure.