11 SEC Dyno Day

Milford Autoelectrical · Post by **Milford Autoelectrical** » Thu Feb 13, 2003 8:52 pm

Hi all,

Took the beast down to Bob Homewood Motorsport to get the Link tuned properly.

He uses a Dynapac Hub dyno, and on the initial run the car made 148Hp @ 6psi.

The temperature of the day made a substantial dent in the output of the turbocharged car and as the temp of monday in his workshop was about 28 degrees, resulted in high inlet air temps. Anyway with a days tuning it made 249Hp @ 16psi on a hot day, with RPM limit at 6000. With increasing only the rpm limit to 7000 we made 264Hp @ 16psi at the wheels. He wants me to come back on a normal day and with a RPM limit of 7800 and 18psi and tune it again. Aparently 300-320Hp will be made without the engine breaking a sweat. Sounds great :->

310Hp, 970Kg = a shit load of fun!!

I recently recieved a Mazdaspeed short-shift kit and a Mazdaspeed 240Kph speedo that i ordered for japan. The quality of the product is absolutely amazing all aluminumn, CNC milled and lathed. The short-shift is awsome to use, the throw distance between 3rd and 4th is about 1 inch. The part was about $580+GST and available thro Mazda. The speedo was about $460+GST

Steve Driscoll

darryl · Post by **darryl** » Thu Feb 13, 2003 9:01 pm

sounds like a weapon, get it to the nightspeed drag wars now, then the circuit
too would be interesting to see.

Reuben Tarran · Post by **Reuben Tarran** » Thu Feb 13, 2003 11:13 pm

Please excuse my ignorance, but what have you done to your MX-5. Im looking at
a turbo install on my partners eunos roadster as well. But not wanting to go
too overboard. What would be the minimum things required to perfrom this
conversion.?

Cheers
Reuben Tarran
021 2230734 work.
07 5412560 A/h

lou Girardin · Post by **lou Girardin** » Fri Feb 14, 2003 8:08 am

Amazing, I wonder how that dyno compares to the US dynajets, which are
supposed to read high?
I assume that's whp.
Lou

lou Girardin · Post by **lou Girardin** » Fri Feb 14, 2003 8:09 am

Money!

Delich, Martin · Post by **Delich, Martin** » Fri Feb 14, 2003 8:14 am

Yep... sounds like the ultimate fun machine alright!
As a side note... I would have thought Dyno operators would correct the HP
figure back to "standard day" (std day= 15.0 0C, 1 bar atmospheric pressure)
reading.
That way if you have recorded power levels on a hot day (like you did on
Monday), you can return on a cold day and have comparable power figures.
Also... saves having to pick a "normal day" to return for another run (or am
I missing something...?).
Cheers.
MD.

Ian Chapman · Post by **Ian Chapman** » Fri Feb 14, 2003 8:23 am

Very impressive! I'm interested to hear what you've done to get these figures.

If it still looks relatively standard, I would love to see the face of WRX, EVO, etc drivers as you torch them at lights and up hills!!

Indicative dollars?!! - or would you rather forget!

Ian

Sean Craig · Post by **Sean Craig** » Fri Feb 14, 2003 10:42 am

hay Steve ... drop me an email about your car. Sounds like a feature
car for New Zealand Performance Car Magazine ...
photos@parkside.co.nz

yes Lou I'm back from holidays ... we can argue about spacers again

Sean

lou Girardin · Post by **lou Girardin** » Fri Feb 14, 2003 1:10 pm

Not that easy, they can correct for atmospheric pressure differences. That's a
simple calculation. There's too many variables with ambient temps.

lou Girardin · Post by **lou Girardin** » Fri Feb 14, 2003 1:12 pm

Welcome back, let's argue about something relevant like which colour is faster
or, are early 1.6's the only true MX 5.

Sean Craig · Post by **Sean Craig** » Fri Feb 14, 2003 1:19 pm

he he he he ... sound like fun lou ... true blue and 1.6 all the way
for me

actually my fav colour is silver but the blue one was cheep he he he

On Friday, Feb 14, 2003, at 13:12 Pacific/Auckland, lou Girardin wrote:

[...]

Delich, Martin · Post by **Delich, Martin** » Fri Feb 14, 2003 1:46 pm

Warning: The following text contains tech stuff.

I disagree Lou... I don't think it's that hard.
What's the point in even measuring HP if it's not accurate or repeatable
consistently.

At AirNZ we have to test engines before they can be fitted to an aircraft

lou Girardin · Post by **lou Girardin** » Fri Feb 14, 2003 2:29 pm

What I'm referring to is the relative efficiency of intercoolers etc., they do
differ. I may be wrong but I don't think it's a simple matter of x hp per
degree ambient.

Delich, Martin · Post by **Delich, Martin** » Fri Feb 14, 2003 2:51 pm

True. But intercooler efficiency is a function within the engine package.

The environment in which the engine is tested should be able to work out
correction factors that allow engine run data on a hot day to be compared
with an engine run data on a cold day. If you wanted to correct for
intercooler effect you could measure turbo inlet air temp and engine
manifold inlet air temp.

I suppose this is all irrelevant because apparently the red ones are
fastest... hehehehe...

jeff · Post by **jeff** » Fri Feb 14, 2003 3:12 pm

(warning: tech content ahead!)

It might not be that significant since the temperature gradient between IC inlet and ambient might drop from (130 - 20 =) 110 to (130 - 30 = ) 100. Coupled with the IC efficiency this would result in a rise of a few degrees at the throttle. The rule of thumb is something like 1% power gain for every 4 degree drop, I think?

BTW - I noticed throttle inlet temps of 30 to 38 C during my 12psi run down at Meremere, above ambient (~25C) for sure, but still lower than stock! And Steve's IC is better than mine... and I don't have an IC spray either

BTW - good work Steve!!

lou Girardin <lou@mongoose.co.nz> wrote:What I'm referring to is the relative efficiency of intercoolers etc., they do differ. I may be wrong but I don't think it's a simple matter of x hp per degree ambient.

Fletch · Post by **Fletch** » Sat Feb 15, 2003 10:50 pm

I think the issue is not whether you can correct the dyno figures or not...
(you can)

Its whether you can tune the car safely or not...

He went in with a 150HP car and came out with a 250HP car... that means
they were tuning... trying different fuel/ignition/boost settings...
probably best not to push the boundaries when the intake temps were so
high...

Even a large fan blowing on a stationary car (very common for chassis dynos)
doesn't have the same cooling effect on intercoolers and radiators as
actually pushing the car through the air at 100kph+ does, so its probably
just not a good idea to tune for maximum power in those conditions...

Fletch.

lou Girardin · Post by **lou Girardin** » Tue Feb 18, 2003 8:02 am

Then add humidity, by the time you've done all that your up to hundreds of
dollars of dyno time and haven't done any tuning.

Delich, Martin · Post by **Delich, Martin** » Tue Feb 18, 2003 8:10 am

Yeah... it's all a waste of time and money... probably better to stick with
the crap HP figures and add the "BS" correction factor (I am joking!)

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