The numbers aren't what I was looking for, but I understand that the car is not fully broken in and plus I have no intake which fudged a little with the overall outcome. Anyway, as you can see my baseline which was done with just the Z-tube laid down 211.27hp/210.43tq and after installing the Stillen exhaust and Crawford high-flow cats I put down 217.21hp/216.90tq. I'm sure the car will lay down a bit more power after the exhaust gets broken in.

 

how can the exhaust be broken in to show higher numbers??

 

Hmmm. How many miles do you have on the car? The 05 is supposed to be 280 at the crank, so with 20% loss on a 5AT, you should have at least 220 RWHP as the baseline. My 03.5 put down 215 HP/TQ bone stock. But I didnt dyno it until it had about 12K miles.

Get your oil changed to M1 5W/30 at 2500 miles or so, then dyno again. I bet the numbers will be higher. It just needs time to loosen up a bit.

You didnt put any big 19-20" wheels on there did you? Also, what was the A/F?

 

Here is another dyno suggesting that the 260hp 03/04 G35 sedan was indeed making closer to 280hp.

 

I've only got 1300 miles on the car. No, big wheels just the stock 18". I didn't get the A/F read, so I couldn't tell you. Anway, I'll dyno again once the car has had some miles put on it. Hopefully they'll be better.

 

Ok you have lost me here???? The car that was dynoed was an '05 so how does that show that the previous models were putting down that power. I'm not seeing your connection there - it's late here so maybe I am just half asleep.

 

I just don't buy it. The wife's 04.5 5AT's baseline dyno showed 215/208, and my baseline dyno showed 242/212. If her car, at the time of the baseline dynos, was indeed making 280 at the crank, then my car was making about 315 at the crank. Doesn't add up, at least for our two cars.

 

The 03/04 5AT sedans typically put down 210-215whp stock (Dynojet) which is right in line with what this 05 5AT sedan did stock. Other 5AT 05 sedans have put down similiar numbers. I've witnessed an 03 5AT sedan put down 210whp stock. My point was that the 260hp 03/04 sedans are actually making closer to 270-275hp or close to power of the 280hp 05+ 5AT sedans.

 

I buy that =)

since i have a 04 lol !! J/K

but well, why dun you wait for your car to have been broken in first!! before you do any dyno? I mean .. give her a few more thousands of miles.. then you can go back to dyno, or maybe even with a tune!!

 

Ok well I will say that I see how you made that connection and follow by saying that I disagree. Thank you for answering my question - I am getting sleepy I guess.

I find it hard to believe that they would have a 25% powertrain loss with the automatic transmission. I would say it MORE likely that the 05 autos are being inflated to some degree. Also, I will say that dyno conditions make a lot of difference in results. There are SOOOOOO many factors there that I am not fond of comparing dynos that weren't done the same day and the same place. Just my .02 on your thoughts. As in most things - to each his own.

 

wow, those numbers after the stillen exhaust and cats are really surprisingly low! 6hp/ftlb is shockingly low...

 

Yeah, my thoughts excactly, but hopefully after a couple hundered miles I'll get better numbers. Who know's!

 

Why does everyone assume bigger wheels will result in lower numbers? Our 18's use a larger profile tire than a 19 would. Put them size by size with a 18 - 245 tire and a 19 - 235 tire, they will be very close if not similar.

 

I agree that all dynos read different, model to model, state to state. I've been saying that for years. It's just that with the dyno data we have of 03-05 G35 sedan 5ATs, there is very margin difference between the numbers suggesting that either the 03/04 was underrated and the 05+ is overrated. The 03/04 6MTs vs 05 6MTs is an entirely different argument. The 05+ 6MT clearly make more peak power than the 03/04 6MT; however, when you calculate the average power of the useable powerband (4500rpms+), both cars have the same power under the curve and both cars perform the same in the 1/4 mile.

 

You could have 20" wheel combo weigh the same as an 18" combo, but the 18" combo isn't going to suck out as much power. Why? Because the further the mass of rim/tire is away from the hub, the harder it is to accelerate therefore the more power it takes rotate.

Also, just because a tire is lower in profile, doesn't mean it's lighter. Low profile tires are heavy because they have thick rubber and reinforced sidewalls and multiple belts for high speed. Lots of dense rubber equals a heavy tire.