mx5cartalk.com

.

Click on the images for larger versions

Only minor mods so far: Mazdaspeed (AEM) cold air intake, custom midpipe, Trust exhaust.

Will be interesting to compare these after the more serious mods have begun...

Yes indeed. Will be interesting to see what these further plans are, too

Don't suppose you did a stock baseline run prior to the current mods? (No, neither did I).

CoffeeBoss wrote:Yes indeed. Will be interesting to see what these further plans are, too

Don't suppose you did a stock baseline run prior to the current mods? (No, neither did I).

I did.

Went from 91.6 to 105rwkW.


EDIT: Matt, I'm confused about the first graph.
kW's are fine but the torque only shows approx. 150Nm. Am I reading this right?
My graph (admittedly with the mods) shows 286Nm. Our fuel maps are similar.

Nice baseline figure Matt. I'm keen to see where that figure will go

Charlie Brown wrote:kW's are fine but the torque only shows approx. 150Nm. Am I reading this right?
My graph (admittedly with the mods) shows 286Nm. Our fuel maps are similar.

Different gears? Gear ratio affects torque readings (although the shape of the curve shouldn't change)

Charlie Brown wrote:EDIT: Matt, I'm confused about the first graph.
kW's are fine but the torque only shows approx. 150Nm. Am I reading this right?
My graph (admittedly with the mods) shows 286Nm. Our fuel maps are similar.

Hi Charlie

I was very confused about your graphs too I suspect a mathematical error somewhere.

I'm sure a mathematician (or engineer) will correct me on the below, but...

Power (W) = Torque (Nm) * angular velocity (radians/sec)

therefore Power (W) = Torque (Nm) * 2 x pi x RPM/60

as such, Power (kW) = Torque (Nm) x pi x RPM / 30000

Take the value at 5000 rpm - Power (kw) = 150 * 5000 * 3.14159265 /30000 = 78.5kW - which is pretty close to the value on my graph.

- Matt

The day has come!



Looks like it's around a 60% increase over stock, and look at how smooth that torque curve is!

No idea what units the torque is measured in - it's not lb/ft nor lb/in - but other than the stumble around 3500rpm it is nice and flat - and a nice progressive power curve

More tuning to be done, but I am well impressed with the result.

Fark yeah! Nice figure and graph Matt

Just out of interest I used the above formulas to convert hp to torque in Nm (converting to kW first by multiplying with 0.745)

153hp @ 4500rpm = 242Nm
177hp @ 5500rpm = 229Nm
201hp @ 6900rpm = 207Nm

comparing with my previous graph it looks like a 60% increase across the board. It's like driving with a 3.2L engine