Dyno-mite! (08 MS3 stock dyno)

[smakdown61]

Went down to wilmington today for the subaru dyno meet to represent the mazda crew. They probably dyno'd about 25 cars today. Mine graph is attached below. Just for comparisons sake, here are some numbers from the cars I can remember:

97 legacy gt 2.0L wrx swap w/ vf34: 285hp/250tq
04 stage 2 wrx 20psi: 230hp/260tq
07 wrx TR stage 2: 220hp/270tq
08 iforce v8 tundra: 315hp/315tq
07 STI with intake and exhaust (untuned): 250hp/250tq
Dodge Viper r/t 10: 500hp/500tq
240sx w/ s14 swap and big ass turbo: 460hp/410tq
evo 9 mr with bolt-ons and tune: 330hp/330tq (damn!)

Everyone was really impressed by the stock numbers for this car...and very puzzled by the EXTREME drop off in power after 5500rpm lol. The tech that drove the car onto the dyno actually stalled it when trying to get it out of the parking spot. He said "Holy s*** is this the stock clutch?". I'm very happy with these numbers and can't wait to throw on a cobb sri.

Videos to come soon.

 

[Young Roids]

that is one of the highest stock dynos I have seen.

 

[dparm1984]

Torque numbers look a bit high.

Did they punch in the correct gear ratio? Ambient temp/humidity? A/F ratios?

 

[smakdown61]

Why would it be off? Both numbers show about 10% drivetrain loss. Others who have dyno'd on other dynos said it was pretty accurate.

 

[SPEED305]

its not off. this dyno is the best representation of our stock power

 

[MS3077]

Seems about right to me. Nice numbers!

 

[hectik1]

Very nice!

 

[iredremix]

niiice, thinking about putting mine on a dyno in a few weeks!

 

[Andrade08]

DynoJet...........They are not as common ans the mustang Dyno. The DynoJets will always show higher numbers. Which is more accurat.......I have no damn idea.

 

[Focus]

DynoJet...........They are not as common ans the mustang Dyno. The DynoJets will always show higher numbers. Which is more accurat.......I have no damn idea.

How about this. Neither one of them are accurate.

An Engine dyno would give you correct results.

A chassis dyno is merely a tool to help tune a vehicle. I say vehicle rather than engine because gearing, drivetrain, wheels and tires can also make a difference.

Think about it, you are transferring this power through a whole drivetrain and then through wheels and tires, and then turning a big roller. The roller is CALCULATING an approximation of how much work is needed to turn it according to preprogrammed formulas. Let's not forget the variables that are input by the dyno operator, or should I say the ones that are incorrectly entered, or not at all...

What about humidity and elevation, etc... What about if the bearings on the roller are a little worn out and it takes more power to turn it. The chassis dyno can not compensate for all these different scenarios. Al lit is good for is tuning. You change something, you go back to see if you have gained power or lost. You find out if you need to adjust your air/fuel mixture, etc...

So if you want accurate, you need an engine dyno.

 

[Andrade08]

How about this. Neither one of them are accurate.

An Engine dyno would give you correct results.

A chassis dyno is merely a tool to help tune a vehicle. I say vehicle rather than engine because gearing, drivetrain, wheels and tires can also make a difference.

Think about it, you are transferring this power through a whole drivetrain and then through wheels and tires, and then turning a big roller. The roller is CALCULATING an approximation of how much work is needed to turn it according to preprogrammed formulas. Let's not forget the variables that are input by the dyno operator, or should I say the ones that are incorrectly entered, or not at all...

What about humidity and elevation, etc... What about if the bearings on the roller are a little worn out and it takes more power to turn it. The chassis dyno can not compensate for all these different scenarios. Al lit is good for is tuning. You change something, you go back to see if you have gained power or lost. You find out if you need to adjust your air/fuel mixture, etc...

So if you want accurate, you need an engine dyno.

I agree but for new cars like these you can't pop the motor out and dyno the motor alone cay you?
I know when I built my 393ci stroker for my Lightning I only did the engine dyno after the break in life cycles. I never did do a chasis dyno because I figured it wasn't needed.

 

[Darksun280]

Torque numbers look a bit high.

Did they punch in the correct gear ratio? Ambient temp/humidity? A/F ratios?

why they look high? I got 246whp and 286TQ stock 5th gear bunch of others dyno with in 3 or four of my numbers as well. Others have dyno'd higher than me stock. My heat soaked pull was 228 271
http://www.mazdas247.com/forum/showthread.php?t=123692494

Any way I'm settled that no one should compare dynos better off just using it as a guage for the mods you put on.

I did 290whp 357tq after intake, BC 24 spike hold 20psi

 

[aaronc7]

Sooo what is the best gear to dyno then? 5th is closest to 1:1, but I don't know how the final drive difference between 4/5 might affect this:

Final-drive ratio: gears 1-4, 3.94:1; gears 5-6, 3.35:1
1: 3.54
2: 2.24
3: 1.54
4: 1.17
5: 1.09
6: 0.85

 

[MS3077]

When somebody knows for sure without a doubt what is the best gear to use for a dyno please post a thread about it as I want to dyno my car and what the most accurate result.

 

[smakdown61]

I think it mine was a 4th gear pull. The dyno is 3 weeks old, and this was at the beach so not hard to calculate elevation.

 

[Darksun280]

5th is closest to 1:1 there should be no doubt about that. some members n her believe that a 5th gear pull is too much load on the motor which i don't necessarily disagree with them but i do know my 3rd and 4th gear dont hold anything close boost wise to my 5th for some reason

 

[AutoXRacer]

IIRC, correct gear for dyno run is 4th... With the final gear ratio in consideration, 4th is the closest to 1:1.

I'm just regurgitating info... Don't shoot the messenger!! (gun)

 

[SwampAss]

Dynos are stupid. It's all about trap speed! / banned

 

[smakdown61]

Dynos are stupid. It's all about trap speed! / banned

Its useful to compare to other cars, and your own if you plan to mod. I was about on par with stage 2 wrx numbers running high boost. I plan on putting on a cobb sri at some point and will be hitting up the beach alot so it will be on the same dyno.

I noticed something with all of the graphs from this dyno. It seems like the line graph stops about 400-500 rpm short of what the rev limiter is. I know for sure it hit rev limiter so either it stopped taking data, or the rpm scaling is slightly off...anyone else notice this with a dynojet?

 

[SwampAss]

Iz just fooling. Dynos are good for showing progress. To me, comparing even two of the same car is moot.