Supra Forums banner
1 - 20 of 28 Posts

·
AWESOME AMAZING MEMBER
Joined
·
589 Posts
Discussion Starter · #1 ·
Hi,
I just ran my car with a Road Dyno*
Here are the results:
434 hp @6000 rpm
410 lb/ft @ 5000 rpm
:cool:


*a device that captures wheel horsepower through engine rpm. with the correct input data it gives a dyno result. (a 5hp difference might apply according to many people)
for flamers: the device is the perfect tuning tool, last year I only had about 369 hp.


Danilo Reyes:D
 
G

·
Which road dyno is it?

I just looked at this one:
http://www.microsmith.co.uk/rd/dyno.htm

and Wow, are there lots of variables that are fudged.

Test weight:
Transmission:
Drive axle ratio:
Test gear ratio:
Wheel/Tyre info:
Drag coefficient:
Frontal area:
Drivetrain loss factor:
Temperature:
Altitude:

"Real" dynos have lots of fudging also, so I'm not saying one is better than the other or that your results are not accurate. Just commenting for the heck of it. :)
 

·
AWESOME AMAZING MEMBER
Joined
·
589 Posts
Discussion Starter · #3 · (Edited)
Yeah is the same but from a US vendor.
http://www.charm.net/~mchaney/homedyno/dynokit.htm


There are a lot of info to put in, these were mine:
Tires 275 /40 17
Drag coefficient 0.33 turbo 1988
Frontal 19.69
Drive train loss .15
Weight 3700 lbs driver +1/4 tank
3767 lbs ¾ tank
elevation forest grove 287 ft
drive axle ratio 3.727 : 1
gear ratio 2nd 1.96
gear ratio 3rd 1.31

11_21_2003 8:15 pm
temp 32.3 f
humidity 85.1 %
pressure 30.90 “ hg
dew point 28.3 f (not used)
Elevation forest grove oregon 287 ft
 
G

·
Pretty neat.

How much did the total package cost? Have you found it useful for doing any tuning or product testing?
 

·
wastegate hose is pulled
Joined
·
4,586 Posts
That's pretty cool. I think I sense my wallet getting lighter....

One question though- Why does it use a barometer and an altitude correction? Why not just the raw barometer? I guess I could just put in 0 altitude.
 

·
GOT BOOST?
Joined
·
551 Posts
Just to let you know guys... If anyone is considering AEM PEMS that is a function that is availiable with the AEM...
 

·
Republican
Joined
·
8,421 Posts
so, how much does this unit cost?
 
G

·
So nothing else is needed, apart from the "road dyno" kit?

That sounds very reasonably priced.

What have you changed from the 369 to 434 hp improvement daniloreyes?

Thank you.
 

·
AWESOME AMAZING MEMBER
Joined
·
589 Posts
Discussion Starter · #10 ·
I have a TO4B turbo charger so...
Basically I was using 9 psi with the stock fuel pump, and I did not wanted to go higher without the fuel upgrade.
I installed a Walbro 255 fuel pump and now I"m able to run 16 psi.
Soon I'll install a HKS VPC!!! and bigger injectors.
 

·
Unnaturally Aspirated
Joined
·
330 Posts
daniloreyes said:
Soon I'll install a HKS VPC!!! and bigger injectors.
Do you already have the VPC? If not, then why that rather than the MAP ecu that PHR sells? Or maybe sell the VPC on e-Bay:cool: j/k. That home dyno sounds pretty interesting for only 50 bucks, however inaccurate it may be. Your results are pretty impressive though.
 

·
25psi = 14" brakes :)
Joined
·
2,306 Posts
Seems like a G-Tech pro would work better.
A co-worker of mine who was a cop said the PD he worked for used one to test the cars out. (It was accurate enough to tell if a car was running poorly just with a few accleration runs. Same thing with cornering.)
Just need to roll the car and driver over some scales, enter the exact weight of the car, and the unit did the rest. (According to him.)
Later.
 

·
Registered
Joined
·
314 Posts
You have to test it at a 1:1 ratio. If I dyno in 1st gear I could make some awesome #'s.

Do it again, except in 4th gear. Then you can compare to everyone else.

Waiting patiently,

Dennis
 
G

·
The road dyno website suggest second gear for the pull.

I think with the higher gears, you get going so fast that the aerodynamic drag becomes a huge factor.

Since we're just guessing at the aero values, the approximation of HP becomes less accurate the faster you go.

The program takes the gearing into account.

My 2 cents.
 

·
AWESOME AMAZING MEMBER
Joined
·
589 Posts
Discussion Starter · #17 ·
ma71supraturbo said:
3rd gear? Why not 4th like everyone on a regular dyno?
Yeah, the manufacturer recommends 2 gear. But then they also say that the HP difference should be about 5 hp.
Acording to my calculations it should be pretty accurate. But then I still plan to go to a real dyno and compare.


Do you already have the VPC? If not, then why that rather than the MAP ecu that PHR sells? Or maybe sell the VPC on e-Bay j/k. That home dyno sounds pretty interesting for only 50 bucks, however inaccurate it may be. Your results are pretty impressive though.
No, I have it already. But if I sell I would get the AEM.
:D
 

·
wastegate hose is pulled
Joined
·
4,586 Posts
It is up to the operator to ensure the accuracy. If you tell it the car weighs 10,000 pounds and then do a run down the side of a cliff it will believe you and say you have 200,000 horsepower.

It is a tuning device, just like a "real" dyno.
 
1 - 20 of 28 Posts
Top