Just Dyno'd my car: results and comparisons

[jworms]

This is from the recent dyno day we had at Church Automotive. the dyno my car ran on was a dynapack 4000. i had run there before with my current mods minus the track pipe and was decently content with the results, but my A/F was all messed (too rich) and my car was misfiring. after lots of troubleshooting i came up with the idea to unplug my MAF...yes, you heard right. so i've been driving the car around without the MAF plugged in for quite some time and wanted to get it dyno'd...here's what i got (note: this dynapack typically reads between 10-15 higher than dynojets):


as you can see i actually gained power...quite a bit actually. you'll also notice that there is absolutely no drop in torque anywhere with the addition of the track pipe.

wanna see why unplugging my MAF actually helped me? here:

look at my A/F differences between having the MAF plugged in and not having it plugged in (plugged in is the lighter lines).

something else to notice is that after around 5500rpm my rwhp line kinda flattens out. i was talking to Church and he mentioned that it seems like the car is having breathing issues (either on the exhaust side or the intake) at higher RPMs. sounds logical to me, so i'm thinking i need to clean my air filter and possibly get some headers.

here's a comparison of my dyno graph and an e46 M3 a buddy of mine owns (m28 on here) when his car was relatively stock. only upgrades to his car were catback and center section of exhaust. the graph:

pretty obvious which lines are mine, i surely don't rev to 8000rpm
also, you can ignore the title of the dyno graph where it says Gary. he had his car on the dyno when the guy was printing the graph out so i guess it left his file title on there.
the interesting thing to look at is the huge gap in peak torque numbers with both cars


My current mod list:
M50 Intake Manifold
Conforti 3.5" CAI
AA Custom Software
3.5" HFM
Fan Delete
Strömung Exhaust
UUC Stg2 Ltw Flywheel w/ Stg1 Clutch
AA Track Pipe

[QuestMCoupe]

Interesting. The e46s torque is way up there but the rwhp isnt too far from yours.

Did you actually feel a difference when you installed the 3.5" hfm and aa software? A couple of people I know with OBDII M3s didnt really notice much. Just wondering what your thoughts on it were.

[BaLLZacK]

Interesting. The e46s torque is way up there but the rwhp isnt too far from yours.

Did you actually feel a difference when you installed the 3.5" hfm and aa software? A couple of people I know with OBDII M3s didnt really notice much. Just wondering what your thoughts on it were.

look again thats jworms torque he make way more torque than the E46 M3!! but AAs tune is kind of better in low rpms cause without the MAF hes running rich but hes still making way more power down there. Hes making alot of power without it though!??!

[cstang68]

What do they use to convert the wheel hp/tq numbers to flywheel numbers? So 260/260 at the flywheel seems doable with your mods. I'll have to try the unplugged maf the next time I get my car in for a dyno.

[ParadigmGuy]

Flywheel?

[jworms]

look again thats jworms torque he make way more torque than the E46 M3!!

exactly!

What do they use to convert the wheel hp/tq numbers to flywheel numbers? So 260/260 at the flywheel seems doable with your mods. I'll have to try the unplugged maf the next time I get my car in for a dyno.

it's not flywheel hp, it's rwhp but without the drivetrain loss from the wheels/tires. like i mentioned it's between 10-15 higher than a dynojet, so you could say that i would get between 245-250rwtq and between 249-254rwhp on a dynojet. you can see this with the relatively stock e46 dyno where he makes 260rwtq/296rwhp

[ParadigmGuy]

exactly!

it's not flywheel hp, it's rwhp but without the drivetrain loss from the wheels/tires. like i mentioned it's between 10-15 higher than a dynojet, so you could say that i would get between 245-250rwtq and between 249-254rwhp on a dynojet. you can see this with the relatively stock e46 dyno where he makes 260rwtq/296rwhp

The dyno sheets say flywheel HP and flywheel torque.

[jworms]

The dyno sheets say flywheel HP and flywheel torque.

don't look at what it says. i don't know why they put that there. in order to get flywheel horsepower we'd have to pull the engine and set it up on an engine dyno...this dyno measures at the wheel hubs which would be affected by drivetrain loss.

here's a bunch of information on dynapack dynos:
http://home.earthlink.net/~spchurch/...ting/id12.html

if that were flywheel hp the e46 M3 is only making 296 hp. you can call it what you want, doesn't matter to me. i mostly posted for the comparisons.

[ParadigmGuy]

don't look at what it says. i don't know why they put that there. in order to get flywheel horsepower we'd have to pull the engine and set it up on an engine dyno...this dyno measures at the wheel hubs which would be affected by drivetrain loss.

here's a bunch of information on dynapack dynos:
http://home.earthlink.net/~spchurch/...ting/id12.html

if that were flywheel hp the e46 M3 is only making 296 hp. you can call it what you want, doesn't matter to me. i mostly posted for the comparisons.

I know what a dynapack is, I was just thrown off by the wording on the image. Some shops will add 15%-18% to the results to estimate flywheel HP. By looking at your mods list, it seems that this is what they may have done. If not, congrats for having a strong NA M3.

[iamnotsakred]

The dyno sheets say flywheel HP and flywheel torque.

yes it sure does and is just a heading. there is no real way to calculate flywheel hp as im sure your aware of. only way to do so is to take the motor out and dyno it on a brake dyno. if it was a flywheel hp number then the E46 M only has what 297 flywheel hp?? but regardless of what the number say you cant deny the comparrison.

Hammad

[mitchelrl]

The reason this dyno's higher than a dynojoke is because the bloody wheels are off the car.

less rotational mass = less power lost in the drive train.

This dyno may be good for tuning, but I wouldn't go bragging about the results you get from it.

[ParadigmGuy]

yes it sure does and is just a heading. there is no real way to calculate flywheel hp as im sure your aware of. only way to do so is to take the motor out and dyno it on a brake dyno. if it was a flywheel hp number then the E46 M only has what 297 flywheel hp?? but regardless of what the number say you cant deny the comparrison.

Hammad

As stated in post #9. Some shops will add 15%-18% to the results to estimate flywheel HP.

Comparison of what to what?

[cstang68]

I think he means compared to the stock E46 M3 dyno.

[ParadigmGuy]

I think he means compared to the stock E46 M3 dyno.

That sheet says that it's of a Z Coupe.

[BaLLZacK]

That sheet says that it's of a Z Coupe.

Yea thier sheets are all messed up, he dyno'd at our dyno day so more than a few members can confirm this including the owner of the Z coupe(sound of Speed).. be as skeptical as you want but compared to the E46 M3 dyno it shows how much more power hes putting out without cams!! Chasis dynos don't take into account the weight of the wheels but there isn't any percentage added because E46 M3s would not dyno 296 hp to the crank or flywheel...

[BaLLZacK]

The reason this dyno's higher than a dynojoke is because the bloody wheels are off the car.

less rotational mass = less power lost in the drive train.

This dyno may be good for tuning, but I wouldn't go bragging about the results you get from it.

I think you can brag when you put out more torque and about as much power as an E46 M3 and again this is all without cams believe it or not

[ParadigmGuy]

Yea thier sheets are all messed up, he dyno'd at our dyno day so more than a few members can confirm this including the owner of the Z coupe(sound of Speed).. be as skeptical as you want but compared to the E46 M3 dyno it shows how much more power hes putting out without cams!! Chasis dynos don't take into account the weight of the wheels but there isn't any percentage added because E46 M3s would not dyno 296 hp to the crank or flywheel...

Sounds like he has a beast of an NA M3 then.

[Ghery]

That sheet says that it's of a Z Coupe.

Hah I wish, their error.

I made only 195whp

[TC535i]

Hah I wish, their error.

I made only 195whp

It's not whp without a "w"

[fsmtnbiker]

Would you prefer hhp? (hub horsepower) ?

[ParadigmGuy]

Hah I wish, their error.

I made only 195whp

That's still pretty good for a Z3, isn't it?

[BaLLZacK]

It's not whp without a "w"

Although one can argue it is whp since thats what we're putting to the wheels while roller dynos measures what your putting to the ground so maybe that should be changed to ghp???

minus 17-20hp and call it a day Dyno numbers are not very comparable in the first place...

[mitchelrl]

I think you can brag when you put out more torque and about as much power as an E46 M3 and again this is all without cams believe it or not

Ok, Just because a Dyno says thats what they're puting down, doesn't mean it's accurate. By the way it's being described, it sounded like the guys run the shop like a bunch of monkies sodomizing a football.

It takes about $5,000 more dollars to get up into the 260whp range on an S52 with stock internals.

bring it to a good shop with a mustang dyno then come rub it in my face if you can even come within 20 whp of what this dyno is blowing up your ass.

[JohnnyBgood95]

The dyno sheets say flywheel HP and flywheel torque.

Dynapac's are from NewZeland, they call the rotors flywheels there.

[96cosmosM3]

That dyno reads way to high. Go and get some dynojet numbers.