flexus

Hey i just went and dynoed my car. I've been fixing it for a while and it's getting better.

275HP and 360Nm (265 lbs/sq ft).

The HP is about right but what's wrong with the torque? What could be taking 20% off the normal value?

Injuneer

Just curious.... why would your dyno results be given in English units for HP, and metric units for torque, requiring you to convert the torque from newton-meters to pound-feet (not lbs/sq ft)?

96capricemgr

What have you done to the car?

You realize a LOT of the stuff offered for these things is complete crap. If a magazine promotes it the chances are good that the product is not.

flexus

I'm from Europe, they gave me hp and Nm figures. I converted so you wouldn't have to in case you wanted to just as a helper.

Basically the car is bone stock atm. Bought it in horrible condition tried to fix it up, to whatever extent i could find problems. The only thing not stock maybe is the air filter which is from a Kia, only thing i could find here to my size (SLP SS airbox...).

LSWHO

Basically your torque is low, your hp is HIGH.

You should be in the 255hp/300ftlbs range.

I dynoed 231/270 BONE stock in an A4. And this was LOW as far as average, but still 18% drivetrain loss.

BUBBA

BTW, HOLLEY makes a filter for your car.

flexus

I understand these oiled cotton filters aren't good cause they oil the air sensor and end up doing more damage than good. I'm looking into finding an AEM dry filter or having them make one my size

Injuneer

Only if you put too much oil on them. Used correctly, they will not hurt the MAF sensor.

Is there any way you can post the dyno sheet?

At what RPM did the engine make peak HP?

What kind of dyno was it, and what correction method did they use?

95ltbird

according to k&n they have no effect at all on the maf! which is a total lie and bull****! my maf was caked with it. but its clean now... k&n gets the thumbs down for me.

LSWHO

I've never had a problem with K&Ns.

dangalla

usually you will only have problems if you over oil the filter

Interceptor1

Me neither, if my toothbrush used a filter I would put a K&N in it.

flexus

Well then the dyno is made of 4 cylinders, each wheel spinned between 2. They haven't sent me the dyno yet As far as i remember tho they did it in 5th and the speed limiter came in before it could get to top revs, i just extrapolated 275, it was actually 266 @ 5200-5300.

I have no idea about correction. There was another line down there tho which said -hp loss-.

Pontiac_97

why the heck did they do it in 5th gear? wtf!! they should've done it in 3rd gear

Injuneer

You don't dyno an M6 in 5th gear. That is overdrive and may produce poor torque results. You dyno it in the 1:1 ratio 4th gear with an M6. Also odd that it hit the speed limiter. In 5th gear, with stock tire diameter (25.65" or 65.2 cM)) and stock 3.42:1 rear axle ratio, it would be at 157 MPH (253 kM/H) at 5,200 RPM. That would be the end of the speedo scale, but not where the speed limiter is set. The speed limiter in cars with Z-rated tires is set as 255 MPH (410 kM/H).

Because of the defined relationship of HP to torque, at 5,252 RPM torque in lb-ft will equal HP. If you had 266 HP at 5,252 RPM, you had 266 lb-ft (361 Nm). That is not necessarily the peak torque. That would typically occur below 5,252 RPM.

Not sure how you would extrapolate HP beyond 5,300 RPM. It is not a linear function, because torque is typically dropping off at that point, and HP is a product of torque and RPM.