04 vs 05 dyno....stock
#47
07-19-2005, 09:07 AM
Guest
Posts: n/a
Originally Posted by ChazM
^eh? we ran identical times against each other.
I've only managed to hit 98 MPH in my 5AT coupe with a 3700 lbs race weight.
Not to go off topic, but I think the high stock-Evo dyno numbers are more an indication of under-rated power than an indication of low drivetrain loss.
#49
07-19-2005, 11:37 AM
Originally Posted by CKwik
How is the 04 HP curve better? Given that the redline on each is 400 RPM apart, and if we assume the cutoffs were at redline, then the 05's power curve starts to become higher than the 04's at about 5800-6000 RPM by my visual estimate. When examining power, the biggest differences will be seen in the range of RPM's you are in the most. When racing, you are typically shifting at or near redline so your lowest RPM will be where the biggest spacing between gears is. In most cars this is the 2nd gear shift. Since the 05 has a higher redline, this point will be higher in the 05 than in the 04. If you were to measure the area under the curve in each of the power bands, the 05 will probably net a higher number. This would equate to a generally faster car. The difference in HP at the mid and low-end is not really enough to make a huge difference in speed. Considering the 05 is better able to use a gearing advantage by staying in 1st gear longer(lower gears have higher torque multiplication), it would be putting more torque toe the ground overall. Assuming the same gearing in both motors, this would be true of each gear. The difference in power is not dramatic, but from a racing perspective, the 05 motor's curve appears to be more desirable.
It's pretty simple actually. The 03/04 has more midrange power from 3000-6000rpms (5-12whp) and not until about 6200-6300rpms does the 298hp motor start to make more power. I know that doesn't sound terribly significant, but cars spends more time accelerating in the midrange than they do accelearating in the upper rpm range (6000-7000rpms). A G35 spends very little time accelerating from 6300+rpms in gears 1, 2, and 3. If you calculate the average power across the powerbands, you'll see that the 298hp motor really doesn't have much advantage at all. Once the car gets into 4th gear and 6200rpms, it should ever so slowly walk the 03/04. This is because 4th gear is pretty long and the car spends more time accelerating from 6300+rpms.
#50
07-19-2005, 01:30 PM
Here is a post I made from Jan. 2005:
"Does anyone think the 2005's will be able to break 14 seconds?
I’d like to see a dyno graph comparison between the ’04 Sedan and the ’05 Sedan. We all know Infiniti is claiming a 38 hp gain on paper, but don’t forget that’s at the peak. I’m more interested in the dyno curve from 3000 rpms to redline. I’d like to see if the ’05 picked up gains along the entire curve at not just at like 6500 rpms. If the gains are only at end of the rpm range, then I don’t think the ’05 is going be much faster than the ’04 model. My suspicion is that the gains for ’05 are only at the peak because that what car manufactures focus on. They like to promote peak horsepower numbers and consumers therefore focus on those numbers too. It’s a numbers game and lately, the trend for cars is more horsepower. Just look at how just about every performance car has bumped up hp. numbers year after year."
Guess my assumptions have been proven. The mid-range curve on the '05 has not improved from prior years. This is disappointing to me. On the street with real life driving, the low-end and mid-range power is what really matters. I don't plan on spending too much time at 6000+ rpms on the street.
This is why I like in-line 6 cylinder engines (i.e. BMW products).
"Does anyone think the 2005's will be able to break 14 seconds?
I’d like to see a dyno graph comparison between the ’04 Sedan and the ’05 Sedan. We all know Infiniti is claiming a 38 hp gain on paper, but don’t forget that’s at the peak. I’m more interested in the dyno curve from 3000 rpms to redline. I’d like to see if the ’05 picked up gains along the entire curve at not just at like 6500 rpms. If the gains are only at end of the rpm range, then I don’t think the ’05 is going be much faster than the ’04 model. My suspicion is that the gains for ’05 are only at the peak because that what car manufactures focus on. They like to promote peak horsepower numbers and consumers therefore focus on those numbers too. It’s a numbers game and lately, the trend for cars is more horsepower. Just look at how just about every performance car has bumped up hp. numbers year after year."
Guess my assumptions have been proven. The mid-range curve on the '05 has not improved from prior years. This is disappointing to me. On the street with real life driving, the low-end and mid-range power is what really matters. I don't plan on spending too much time at 6000+ rpms on the street.
This is why I like in-line 6 cylinder engines (i.e. BMW products).
#51
07-20-2005, 11:32 PM
#53
07-21-2005, 11:39 AM
#54
07-31-2005, 12:07 AM
Registered User
Join Date: Oct 2002
Location: Washington, DC
Posts: 107
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by ChazM
whoa buddy, you are way off.......and show me where a EVO dyno's 241awhp. I would think they would put around 210 or so since awd cars have more DT loss.
The only car I can think of with about 5% DT loss is the Mustang Cobra 03 and 04 and the chevy Cobalt SS. When in reality they have more DT loss than that its just that chevy and ford underrated those engines.
The only car I can think of with about 5% DT loss is the Mustang Cobra 03 and 04 and the chevy Cobalt SS. When in reality they have more DT loss than that its just that chevy and ford underrated those engines.
Well, my reply is a little bit late, but I think you see my point now that Evos do actually dyno at 241awhp stock. Maybe it is an underrated stock hp claim, I don't know. Camaro Z28 and Camaro SS were where I was getting the rwhp number ideas from. The SS could even be found dynoing over the claimed crank hp from Chevy. But anyways, if these cars are dynoing in the 240 range to the wheels, then that is where they are at... just surprising to me. I am new to the rwd game... I've been in awd for almost all of my driving career! Just more motivation to save up for that twin turbo kit!
#55
08-14-2005, 07:17 PM
Registered User
Join Date: Jul 2005
Location: Torrance, California
Posts: 1,489
Likes: 0
Received 5 Likes
on
5 Posts
So, in other words, the HP haven't changed much from the previous years (03-04 to 05) unless you go into the rpm higher range? Well, it looks to be a drivers race then :-) Well, all I can say is that when I sell my car I can say "Yes, you are right, my car does have 298 HP! as oppose to the earlier models that has only 280 HPs" :-) I agree, it is a number game so I say we should just enjoy our cars!
