130i Dyno Results

[Antec]

So i thought i would make a topic wrt my dyno results. Now i see my power was down vs stock figures on saturday (15kw & 35nm) as well as carbons? I stumbled across this on the zoopedup blog, another unhappy 130i owner wrt power figures. So is there a problem with the 130i's they actually make less power than quoted OR lose power over the years?

I know dynotech is accurate and i have not had issues on there before wrt my other cars and stock figures. See below for his blog post.

"Hey petrolheads what a bad day it has been for me today my BMW 130I perfomed very poorly at the dyno day today.The reading came out with 178.8 KW and 294NM bmw claims the car produces 195KW and 315NM therefore I have huge bone to pick with BMW on Monday I recently had the individual control intake replaced under warranty and the car seemed to really perform clearly this wasn't to it's true potential.

I had the traction control on when it was on the Dyna could that have been the cause?
When I got the car back all the warning lights were on ASC,DTC,PARK BRAKE,ABS all them flashing.
Can anyone explain or have a slight idea of why this could have happend? I did all the checks on the car OBC but nothing I am baffled.

Cheezed very Cheezed "

 

[bimmer330]

Because only your rear wheels were turning on the dyno.

 

[Antec]

Does that mean the ECU was cutting power due to that?

 

[bimmer330]

And when it comes to power, did they convert the reading as Flywheel KW?
Was it done at coast or in JNB?

---

No ECY dont cut power, it just sences that something is wrong because your rear wheels are turning and not the front ones. Was power Dyno done at Sea level or JNB?

 

[Sleeper135i]

Relax, If its wheel Kw measured at the coast. Which I'm assuming it is, then it's a fairly accurate reading.

Got to take into account drive train loss. Approx 15%.
Would read even lower if you were at altitude.

178 wKw is strong, I have seen some modded GTis struggle to make that power.

Abs light bonanza is normal after a dyno run, will clear itself once the front wheels start moving again.

 

[Antec]

Its at the coast, and its flywheel.

Doesn't seem to effect the 135i's etc?

So does the fact that my front wheel were not moving have anything to do with the power? But then my previous statement also begs a question. lol

 

[Sleeper135i]

So does the fact that my front wheel were not moving have anything to do with the power? But then my previous statement also begs a question. lol

No, front wheels being stationary makes no difference to power.

Are you sure it's flywheel?
Other variables also affect your readings, temperature, heatsoak, correction factors etc.
All dynos measure differently. I have had 20 wKw difference between 2 dynos with same setup.

Hopefully someone more knowledgeable will chime in to give you a better answer.

Your traction control should have been off completely btw

 

[bimmer330]

That dyno could be approx. 10% off. Than your car is normal.
Remember, no dyno is the same. Some read over and some under. It is simply to compare to other vehicles on the same dyno the same day with the same weather conditions.

 

[Sleeper135i]

Doesn't seem to effect the 135i's etc?

Saw a stock 135i make 180wkw on Saturday. No car is exempt.

 

[gavsadler]

I've dyno'd my 130i at 3 different places:

138wkW & 242Nm @ Savspeed in winter (June)

145wkW @ RGM in summer (January)

144wkW & 250Nm @ KAR in summer (November)

There is a converter on the web somewhere which roughly translates to flywheel figures of somewhere between 190-200kw and 310-350Nm.

I wouldn't say your car is well down on power. Remember as well that a dyno can only really be used as a tuning tool. Like others have said, no 2 dynos will give the same figures.

Also, on any particular dyno on any particular day, there are a lot of factors which influence readings, such as if the dyno has been warmed up or not, air temperature and humidity, correction factors etc.

 

[3V0M-WP]

Antec, every dyno is different. I did 2 runs on Saturday cos I wasnt happy with the first run.

First run I got 178kW/301Nm (with piggyback active)
Second run was 186kW/309Nm (piggyback off)
The 2 runs was about 3 hours apart.

My previous best reading (170kW) at DynoTech is in the chart below. The mods I've done, since the chart results, is the decat and piggyback


Zeemax: 171,7kW/273Nm (June 2008)
Zeemax: 173,4kW/285Nm (March 2009)
DynoTech: 164,6kW/270Nm (March 2009)
DynoTech: 170kW/278Nm (Aug 2009)
Zeemax: 173,9kW/288Nm (Oct 2009)
.... these results are on the wheels......

You must remember the hot weather also affects the results. The weather was cooler on my 2nd run and the engine wasnt as hot. The engine was about 97C on 1st run, 2nd run was 72C (according to steering wheel)

The ABS, DTC lights etc will come on cos the front wheels aint turning while the rear wheels are spinning. The car is confused

 

[Antec]

So does the fact that my front wheel were not moving have anything to do with the power? But then my previous statement also begs a question. lol

No, front wheels being stationary makes no difference to power.

Are you sure it's flywheel?
Other variables also affect your readings, temperature, heatsoak, correction factors etc.
All dynos measure differently. I have had 20 wKw difference between 2 dynos with same setup.

Hopefully someone more knowledgeable will chime in to give you a better answer.

Your traction control should have been off completely btw

My traction control was on, would it make a difference on the dyno you think?

---

Antec, every dyno is different. I did 2 runs on Saturday cos I wasnt happy with the first run.

First run I got 178kW/301Nm (with piggyback active)
Second run was 186kW/309Nm (piggyback off)
The 2 runs was about 3 hours apart.

My previous best reading (170kW) at DynoTech is in the chart below. The mods I've done, since the chart results, is the decat and piggyback


Zeemax: 171,7kW/273Nm (June 2008)
Zeemax: 173,4kW/285Nm (March 2009)
DynoTech: 164,6kW/270Nm (March 2009)
DynoTech: 170kW/278Nm (Aug 2009)
Zeemax: 173,9kW/288Nm (Oct 2009)
.... these results are on the wheels......

You must remember the hot weather also affects the results. The weather was cooler on my 2nd run and the engine wasnt as hot. The engine was about 97C on 1st run, 2nd run was 72C (according to steering wheel)

The ABS, DTC lights etc will come on cos the front wheels aint turning while the rear wheels are spinning. The car is confused

If the readings i got on sat where on the wheels then it could be ok for FWKW?

But everytime i have run at dynotech its been ATF (Front wheel drive car)

Maybe the rollers at the back give readings ATW?

 

[ChrisBrand]

Antec don't worry. At least you didn't get my results! My modded e46 328i does 145kw and 270NM. At dynotech it did 87kw and 160NM...:thumbdo:

 

[3V0M-WP]

If the readings i got on sat where on the wheels then it could be ok for FWKW?

But everytime i have run at dynotech its been ATF (Front wheel drive car)

Maybe the rollers at the back give readings ATW?

Your traction control and aircon must be off.

Our results are at the wheels, theres no ways that both our cars are reading so low for flywheel

 

[Antec]

If the readings i got on sat where on the wheels then it could be ok for FWKW?

But everytime i have run at dynotech its been ATF (Front wheel drive car)

Maybe the rollers at the back give readings ATW?

Your traction control and aircon must be off.

Our results are at the wheels, theres no ways that both our cars are reading so low for flywheel

Cool, i will try dyno my car next week at KSD. Also close to my house and its used for all the stock cars etc to regulate there figures.

Will be a nice comparison.

 

[3V0M-WP]

You going to Street2Strip on Friday night? I'm gonna put the car on

 

[ChrisBrand]

If the readings i got on sat where on the wheels then it could be ok for FWKW?

But everytime i have run at dynotech its been ATF (Front wheel drive car)

Maybe the rollers at the back give readings ATW?

Your traction control and aircon must be off.

Our results are at the wheels, theres no ways that both our cars are reading so low for flywheel

Mmmmm...really? Could explain alot

 

[SKYF]

178kw on the wheels?? Thats a bit strong, finding it hard to believe sorry

 

[3V0M-WP]

I found the following link via Google to show you guys what the 130i looses on the wheels, etc. This makes it clear that my dyno results above are on the wheels and not the flywheel

http://www.rri.se/popup/performancegraphs.php?ChartsID=239

If my dyno results were from the flywheel then explain why its avg 12% less than book spec of 195kW.

The above link explains the debate

 

[Antec]

You going to Street2Strip on Friday night? I'm gonna put the car on

Hey man, i was going to but its a friends bday on friday and we going to party :joy: