323i dynoed

[herr bmw]

okay so yesterday put my car on the dyno after much convincing

now bmw claims 140kw and 250 nm torque

so i was expecting roughly 110kw

was i surprized when i saw the results

94.1kw and 179nm torque,could such a loss be correct?
okay it needs an oil service,but would that really effect it that much?

so on the ay home pick up a dice with a 323i lci and thus thing stays a head and slowly pulls away from me,i only got past him at plenty 20 on the highway and then he sat with me,decided to slag off and cruise home.

also what i cant understand is that burgys girlfriend s yarris got 64kw on the wheels,which is then nearly as strong as my car and uses only halve the fuel.

is there something wrong with my car or is this normal?

 

[moranor@axis]

with 15% drive line loss
108kw
205Nm

supposedly you lose about 17% up there because of altitude...

126kw
235Nm

 

[Raybimmer]

If you have 140 Kw at the coast you should lose say 17 % at altitude , so you then have 140-17 % which is about 116.2 Kw at the flywheel . Now drivetrain losses at say 15 % then you have 116.2Kw -15 % which gives 98.77 kw .

So if normal theory works you have about 98.77 kilowatts available at the back wheels .

 

[herr bmw]

If you have 140 Kw at the coast you should lose say 17 % at altitude , so you then have 140-17 % which is about 116.2 Kw at the flywheel . Now drivetrain losses at say 15 % then you have 116.2Kw -15 % which gives 98.77 kw .

So if normal theory works you have about 98.77 kilowatts available at the back wheels .

so 94 should be about right then?

 

[Sankekur]

Remember it was a pretty hot day as well.

 

[herr bmw]

it was,i look like a tamatoe,and and very sore,even today was hot.

dont supose i can walk into bmw with the dyno results and say there is something wrong with the cars performance.

 

[Sabretooth tiger]

The pre-lci is 130kw, the lci is 140 kw for the 323i E90

 

[herr bmw]

The pre-lci is 130kw, the lci is 140 kw for the 323i E90

incorrect 2008 pre lci was 140kw,confirmed by bmw

 

[Twinz]

I say, go for the oil service. And enjoy the car. For a stock car the dyno will tell you ziltz. :thumbs:

 

[Crash_Nemesis]

Looks like you need to supercharge it...

I got 156wkw and 303nm on RBTS Dyno which has a 0% correction factor. WRC dyno has 24% correction...

I wanted to Dyno my ride yesterday, but had to wait for all the registered guys to finish up before a Project Shift car was allowed on the Dyno and in the end there was no time. I'm guessing I might have got 170wkw on WRC dyno... maybe optimistic...

I'll go with Burgy this weeks.. he needs to tune his M3 anyway, so I'll let you know what a charger does for the 323 e46 series at WRC.

 

[herr bmw]

well got 15000km then mp is up,then must play:rollsmile:

 

[Philip Foglar]

Yep, up on the reef, forced induction of some sort FTW!!! :thumbs:

 

[328-iM]

@Herrbmw saw your car yesterday on the dyno when i arived at WRC.....looks very nice with the black badges.....you and your son were standing next to us when they dynoed the blue M5 ......:rollsmile:

 

[Karthik]

That can't be right , stock 325i E46 with 141kw up at the reef according to RGM does 110kw , before they supercharge , I highly doubt they'd put that amount more than it was . Also Service your car , it makes a world of a difference , your filter's are all dirty probably , or something else too ? I'm noticing a awesome difference after my service , :joy:

 

[Raybimmer]

IMHO a dyno run is done at 20 degrees C temperature , but as the ambient temperature rises the power of the vehicle drops . If the temp was 30 degrees you may lose another 3 or 4 percent power . Thans why your car pulls good on a cold morning and also with a cold air intake ( CAI ) kit .
Oil change if good oil already used should not make a big difference , the air filter will be a bigger culprit .

 

[herr bmw]

IMHO a dyno run is done at 20 degrees C temperature , but as the ambient temperature rises the power of the vehicle drops . If the temp was 30 degrees you may lose another 3 or 4 percent power . Thans why your car pulls good on a cold morning and also with a cold air intake ( CAI ) kit .
Oil change if good oil already used should not make a big difference , the air filter will be a bigger culprit .

replaced air filter last week end before the midnight run

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@Herrbmw saw your car yesterday on the dyno when i arived at WRC.....looks very nice with the black badges.....you and your son were standing next to us when they dynoed the blue M5 ......:rollsmile:

hi thanks for the nice comment,still want to do a couple of changes.

 

[M3_devil]

att Herr

From my experience you can work on around 28% loss which include Transmission and altitude.

Was also told that WRC dyno is slightly down on old figures. Might have been serviced and recalibrated I would guess.

so for your car 141kw should make around 101kw on wheels. So your dyno reading could be spot on seeing that dyno is slightly under reading.

 

[Sankekur]

That can't be right , stock 325i E46 with 141kw up at the reef according to RGM does 110kw , before they supercharge , I highly doubt they'd put that amount more than it was . Also Service your car , it makes a world of a difference , your filter's are all dirty probably , or something else too ? I'm noticing a awesome difference after my service , :joy:

Hmmmmm, I wouldn't trust the stuff RGM posts on there site since they give different values in different places, and there definite mistakes on there site (they have actually admitted this to me) One such is the dyno graphs of the e46 328i and 330i where they put the max wheel power of the 328i at 115kW and that of the 330i at 113kW, which would only happen if the 330i is a complete dog. I emailed them about this a year and a half or so back and they said yeah its a mistake, and they changed the 330i graph to one with the peak power as 117kW, which is still doesn't seem right. I see they have now changed the site a bit and the old graphs are back again :facepalm:

 

[wikk3d88]

RGM's dyno is known to be hopelessly optimistic. At the end of the day a dyno is a tuning tool, nothing more.

 

[bimmer330]

It is simply a point of referance.
You can not compare two dyno's with each other.