3.0si DYNO TEST

[wills]

Hello all.

So, I had a Longlife exhaust fitted to the car this week - from a dual to a quad. There felt to be no loss of power but thought I'd pop in for a dyno test today.

Here are the results;
Run 1; 242.3 bhp (engine) and 233.9lb ft of torque
I cant seem to load a picture of printout from my laptop, so will post from my iphone below

This converted to approx 210bhp at the wheels (?) but dont have the exact figure on the printout. The chap did say he thought there may be a problem with the MAF (air flow sensor) - I forget exactly why as he spoke in technical terms - but there were no fault codes coming up on diagnostics.

I dont drive recklessly, but the car still feels the same - and spirited driving against a 911, and recently beating a Mini JCW off the mark tells me the car is still rather quick..

To test the MAF I'm looking at well over £200 and personaly dont think it's faulty. Anyhow the car still feels quick, the quad exhaust now looks great, and the car itself (black coupe) looks stunning. Time to stop spending money and just enjoy driving. :driving:

 

[wills]

This is from the second run (after ecu reset)

 

[aquazi]

He's the screen of mine for a comparison:

Mine prob could have been better if i had used super unleaded and had a clean air filter.. but oh well!

Your printout isnt big enough to be able to read!

 

[wills]

How come you have 3 hp figures on there? Did they also give you a figure for wheel hp?

 

[aquazi]

How come you have 3 hp figures on there? Did they also give you a figure for wheel hp?

Those were the 3 runs it did.. so the last run had the best output.

I have a whp on the printout... but thats in my car and in another country from me at the moment!

I think the WHP was around 212... which stacks up to the estimated 17% that they use to calc the transmission loss on RWD.

 

[wills]

I'll try and post a better pic later. Interesting to see the difference between your 3 runs - that's quite a margin..

Also does it matter which gear the run is done in? Mine was in 4th, but see many are done in 3rd..

 

[DannyBoy]

Clean your MAF. It is relatively easy to do and has been covered many times on the forum. Cleaner fluid can be bought from Fleabay.

I did this on my old 3.0i which had travelled about 30k and certainly felt an improvement in throttle response thereafter. Also consider changing you air filter, again another easy DIY job.

Dynos are also prone to many variations such as age, outside temperatute, install so again these variations could also affect the result. No two dynos are the same, regardless of make.

How many miles had your car done?

 

[wills]

Clean your MAF. It is relatively easy to do and has been covered many times on the forum. Cleaner fluid can be bought from Fleabay.

I did this on my old 3.0i which had travelled about 30k and certainly felt an improvement in throttle response thereafter. Also consider changing you air filter, again another easy DIY job.

Dynos are also prone to many variations such as age, outside temperatute, install so again these variations could also affect the result. No two dynos are the same, regardless of make.

How many miles had your car done?

Thanks will give that a go. It's done 36k, just had oil change & insp 1 was at 19k

 

[channy106]

I might sound daft in saying this but how is it a 3.0si doesn't come close to the 265?

:?

 

[easty027]

I might sound daft in saying this but how is it a 3.0si doesn't come close to the 265?

:?

i thought the same?

 

[doofus4000]

yup im thinking the same too - big loss for a young low milage car - they aint no honda thats for sure - theyll make bang on their hp or more often over. im thinking now I wouldnt mind putting my 3.0si on some rollers and seeing what shes putting out.

 

[doofus4000]

I might sound daft in saying this but how is it a 3.0si doesn't come close to the 265?

:?

i thought the same?

its 265 ps or 261 hp. still - its quite off the mark!

 

[doofus4000]

I'll try and post a better pic later. Interesting to see the difference between your 3 runs - that's quite a margin..

Also does it matter which gear the run is done in? Mine was in 4th, but see many are done in 3rd..

Usually they try to use the longest gear possible without dynoing at a crazy speed (mph) because the dyno wouldnt like that. Higher gear would give a more clearer graph as the engine is spinning up for longer.

 

[StigJ]

Here are the result of the Dynotest of my 3.0si Coupe:

227.3whp
288,3NM

 

[wills]

Well, air filter is filthy - shall give it a clean and fit a new one next week & will clean maf later today.

 

[R26Andy]

There is so many variables which can cause dyno results to be off the mark.

Firstly, the results should be SAE corrected to account for variations in air temperature and pressure.

Secondly, dynos only measure the horsepower at the wheel, engine drag on run down then allows an estimate of the mechincal friction losses to be made and this is added to the wheel horsepower measurement to get the engine hp. This is only and estimate and can have a % error attached to it.

Thirdly, there are many other factors which can causes variations - air filter condition, spark plug age, petrol grade, tyre slippage, traction control interference, air con running etc etc

Wills - your figure is only off the BMW figure by 7% which is well within the error margins of such dyno's so I wouldnt worry too much.

The only way to properly tell is to lift the engine out of the car and put it on a proper engine dyno.

Regards

Andy

 

[wills]

Here are the result of the Dynotest of my 3.0si Coupe:

227.3whp
288,3NM

Interesting they had the rear wheels off - mine was done on rollers..? Any mods..?

 

[aquazi]

I might sound daft in saying this but how is it a 3.0si doesn't come close to the 265?

:?

I have never had an naturally aspirated car come back anywhere close to the manufactures bhp.

The worst was a toyota celica... 190bhp.. on the rollers made under 150.. that was after a service too; and under 20k miles - thats over 21% less power!

So i'd say there is nothing wrong with a 261bhp car coming back with an ESTIMATED 240bhp.

 

[wills]

Thanks all, feeling somewhat more reassured now!

Cleaned MAF (I think), cleaned air filter - drove to shops and no difference really, still feels the same as the day I picked it up. This all started with 12 yr old mechanic who said the car was sluggish because of the quad pipes - but even if it was the pipes I doubt you would feel a 7% drop in power. I cant feel any difference and I drive the car almost everyday.

 

[StigJ]

Here are the result of the Dynotest of my 3.0si Coupe:

227.3whp
288,3NM

Interesting they had the rear wheels off - mine was done on rollers..? Any mods..?

Some say that the Dynapack is more accurate. I dont know...

Bone stock when I did the run. Hope to get a new run now after I installed the AFE Stage II intake.