Are these dyno readings right?

GPXXX · Post by **GPXXX** » Sun Jan 11, 2004 2:42 pm

i think dyno tuning costs anywhere from $160 upwards. i guess it can be seen as a good way to test your car's performance to show you an indication of how well the motor is running / tuned etc...

payaya · Post by **payaya** » Sun Jan 25, 2004 8:51 pm

Some of you guys seem to be really struggling for power! With the GPX manual i would expect 110 at least stock!

With even a GR i would expect over 100 FWKW. Isnt the GR rated at 135KW?

So if a GR got 100 FWKW, thats a 35KW loss or around 25 percent sound bout right for a manual.

Maybe the FTO power outputs are overrated?

payaya · Post by **payaya** » Sun Jan 25, 2004 8:53 pm

79KW for a GRX? geez almost a 50% loss through the drivetrain!

payaya · Post by **payaya** » Sun Jan 25, 2004 8:57 pm

from what ive seen from dyno results around 20-25% drive train loss for a manual and around 30% for an auto is a good figure.

Example the HSV GTS produces 300kw at the flywheel so around 220 RWKW is a commonly seen figure.

MADFTO · Post by **MADFTO** » Tue Jan 27, 2004 10:11 am

You've got to factor in that we use lower RON petrol and that some of the engines + running gear in our cars would be getting on to around 7+ years old.

Not many people would rebuild these engines/transmissions =)

ellusion · Post by **ellusion** » Tue Jan 27, 2004 2:04 pm

So what's a realistic figure for FTOs? 70% for manual and 60% for tip ftos?

EG. my tip car is rated at 134kw (GX) and its 94kw at the wheels. Being a 1998 model i would assume it is a more efficient car... 94kw atw would make it 70% efficient....

However as you guys stated earlier, tips are around 60% efficient.

My car is either 134kw with a 30% power loss... or a 157kw with a 40% power loss. What do you guys think would be an accurate flywheel figure?

payaya · Post by **payaya** » Sat Jan 31, 2004 7:13 pm

ok i didnt take into consideration the octane and newness factor.

Going to as new cars, you should expect a manual car to produce around 80% of it flywheel figure at is wheels, and a auto around 75%-70%.

usually FWD have less of a loss through the drivetrain that RWD.

I just find even with the age of a car and octane levels the results are really low. Most of these cars are even modified. so it takes away some the oldness and octane factors.

Also i bet most of these results would of been in shootout mode as well so i dunno.

Manufacturers always underclaim and overclaim for marketing, and laws.

Like in japan most powerful cars are quoted to have 206 KW to follow the gentlemans agreement, the Mustang Cobra SC underquotes but a lot of manufacturers also overquote, in the recent past. A great example is the RX8 in america. Mazda overquoted the power figures, so they now are offering buyback scemes to unhappy owners.

Im not saying the FTO is but going by some dyno results maybe?