Dyno'd My Car

[72MetallicMalaga]

My car was in for some frame rail repair, and while I was picking it up, I had an opportunity to dyno it on a Mustang Dynamometer for shits and giggles (no tuning, etc).

 

Here are the numbers at the wheels. This is a stock M10 with dual Weber DCOE 40s, and about 35 deg timing all in. Was going to post a video and the chart, but my phone crapped out, apologies.

 

It's worth mentioning, my AFR leans out a bit past 4500 RPM. Most likely a sizing issue with the main jet, correct? I'm going to pull them this upcoming week and report back on their number. I also do not have a fuel pressure regulator yet.

 

 

[aldo.navarro.13]

Isn't the stock configuration supposed to output 99hp?

What do you think accounts for the difference?

 

[SydneyTii]

Rear wheel HP vs engine output?

[Conserv]

I’m guessing that this is where most of our ‘02’s would come out on a dyno.

 

Thanks for sharing this!

 

Regards,

 

Steve

 

[tzei]

It says ”SAE hp” so i suppose it is sae net (as it should these days) ~ DIN. So it’s engine power. 
 

Interesting…

 

What correction factor was used?

What fuel?

[M3M3]

Mustangs are chassis dynos.  They measure rear wheel HP, not crank(engine) HP.

 

Drive train losses can range from 10-20%.  88rwhp would be about 100 crank HP.  Right at factory rated number for stock engine.

[uai]

My drivetrain loss is 22%

[NYNick]

Can you even buy a car today with 100 HP?

[jimk]

1 hour ago, NYNick said:

Can you even buy a car today with 100 HP?

Only those with a couple of sparkplugs shorted out 

[TobyB]

on the other hand, can you buy a car that weighs less than 3000#?

 

As to the AFR, if you can post a graph, we'd be better able to tell 

what in the carb would correct it.  

But.

Usually at high flow, smaller air correctors will richen the mixture without

messing up the lower ranges.  I'd try that first- go down 10 or so, and then

see how it responds.

 

t

[72MetallicMalaga]

Yup, correct, chassis dyno so the power is at the wheels. This was on 91 octane gas.

 

I'll post the graph as soon as I get a copy emailed.

[John76]

12 hours ago, Conserv said:

this is where most of our ‘02’s would come out on a dyno.

How about HP numbers for a stock motor (pistons & cam) but with the dual Weber 40's??

Properly jetted and timed of course! 

 

[M3M3]

21 minutes ago, John76 said:

How about HP numbers for a stock motor (pistons & cam) but with the dual Weber 40's??

Properly jetted and timed of course! 

 

 

close to the same.  without other changes to the engine, bolting on sidedrafts really just adds noise.  actually could loose power down low.  not enough air is drawn through the carbs when there is only one cyl per barrel to atomize the fuel correctly.  unless you are running head, cam and exhaust mods too, sidedrafts are just eye and ear candy.   

Edited December 31, 2022 by M3M3M3

[Cooper]

For the sake of conversation, I also recently had the chance to dyno my 02. Pistons are the later small piano top style that were meant for around 8.5:1 compression I think? The cam appears like it’s a regrind but doesn’t seem to offer much if any more lift than stock. Carb is a 38/38. 
we changed around the jets in the carb, set timing at 35 degrees total and stopped when we believed that the voltage regulator is keeping the car from running at 14 volts and possibly holding back power because of that. In the end making 85 horsepower and 95 torque. 
also the graph from the first session, showing that I’ve basically been driving a vw beetle until now. 

[Conserv]

42 minutes ago, M3M3M3 said:

 

close to the same.  without other changes to the engine, bolting on sidedrafts really just adds noise.  actually could loose power down low.  not enough air is drawn through the carbs when there is only one cyl per barrel to atomize the fuel correctly.  unless you are running head, cam and exhaust mods too, sidedrafts are just eye and ear candy.   

Thank you for your reasoned explanation. I was going to say — mostly

tongue-in-cheek — “90hp”… 😉

 

Regards,

 

Steve