mr747

Yesterday there was a dyno day in Melbourne so I though I would attend and run up some numbers

I was very surprised and nt really happy my car oe tune ipe headers standard rear half only made 297rwkw

Another coupe same mods just ceramic coated headers made 310rwkw

I'm pretty disappointed at the out come

My car has been siting around for nearly 4 weeks not started or anything and the fuel that I had in the tank had 10% ethanol and that has only been in the tank for 4 weeks

Do you think that could be why my car is down on power

On the way there my friend was driving cause I don't have a license and he didn't really thrash the car or anything

But on the way home I made him give it a bit and it felt really strong

I don't know what else it could be

They gave it 3 runs and every run was getting better and better but they stopped because it was getting a bit hot

Any input would be greatly appreciated

CarHopper

Why does your signature say 330rwkw?

Was this the same dyno as before with the same mods?

I wouldn't really worry too much about it honestly.

mr747

My sig says that because I dynoed that number about 12 month ago

This was a totally different dyno

Merc63

Heat soak, ****ty fuel, car has been baby driven lately, all pulls timing.

Dynos are a waste of time.

mr747

Look I agree totally ^^^ I'm going back to the track to just double check but I just found it really weird same set ups fair difference

So do you think leaving it sit around with crap fuel for 3 weeks could be a issue??

CarHopper

Just not driving it hard could be. Car is constantly adjusting trims to how you are driving it. You would've probably been better off driving it hard to the dyno, letting it cool, then strapping it down.

I wouldn't say bad gas either. You said it even felt fine afterwards. And lastly, all dyno's are going to read differently.

At the end of the day your car sounds fine and you shouldn't worry about anything. Just drive it harder.

Southways

I suspect a large portion of the difference is the dyno. I think you mentioned your previous numbers were from a Dyno-Dynamics unit which are more "friendly" than the Mainline. It has been my experience that the Dyno-Dynamics are fairly similar to the US Superflow & Mustang dynos.
In addition to all the good comments above, heat-soak into the CF air-boxes probably didn't help.


Your track times verify that the dyno numbers from yesterday are conservative. I doubt there is any real power difference from the first time you had it tested ... your car is strong.

wampire

My before and after dyno. So simillar numbers to yours on wheels. But have to say that every time we put a car on a dyno you can see different number So i think in your case its ok even if the numbers a low like a stock car


the only thing im sure is that car pulls much better on a road then the stock one

Merc63

I did a dyno once when I was just tuned and I out down low low numbers. But there was a sl 63 he out down the same as me, couple hp more... Dynos are junk.

Ingenieur

That is 400 rwhp
That's not bad is it?

AMG893

Change your sig!!! (jks)

mr747

im putting race fuel in this week so i will make sure everything is ok then
i will have to load a race tune in so i will check again to make sure all is ok on friday

thanks for your help guys

mr747

shhhhhh

bhamg

If you do that take a half-dozen full throttle runs after to take advantage of full timing advance. I've been told that even 1-2º of extra advance can make a huge difference.