2007 VQHR Dyno Results!
#122
Originally Posted by Hydrazine
It may be that they both have similar transmission losses.
#123
#124
Originally Posted by Hydrazine
You may or may not be correct in the assumption of loss differences,(I don't know) but I can say with certainty both vehicles were under 10K miles and tested under the same conditions and correction factors. Dynapack is also the most repeatable of all dynos.
The data is the data.
The data is the data.
#125
my 2 cents, and I'm not going off data or dyno's. but I do have a 5-AT, and this ain't your normal everyday automatic tranny. this thing is unique and is performance focused. for instance when your on the highway doing 75 @ 3K rpm and in 5th gear, when you take your foot off the gas the tranny pulls you down, it doesn't do like most automatics where it goes into an overdrive mode that allows you to coast.
I don't know if this tranny has any overdrive at all, but it doesn't feel like it does.
my point being, this isn't the same auto tranny you find in a Buick. Why is it so beyond belief in this era of technology that they have an auto that's almost as efficient asa manual?
I don't know if this tranny has any overdrive at all, but it doesn't feel like it does.
my point being, this isn't the same auto tranny you find in a Buick. Why is it so beyond belief in this era of technology that they have an auto that's almost as efficient asa manual?
#128
#129
Originally Posted by kring
my point being, this isn't the same auto tranny you find in a Buick. Why is it so beyond belief in this era of technology that they have an auto that's almost as efficient asa manual?
It may have electronics to match revs or hold gears... but it's the same basic fluid-coupled design that's been around for decades... as long as it's got a torque converter, that doesn't change. And neither does it's inefficiency.
I'm not arguing the numbers, or saying that anybody is skewing them on purpose. But it's like saying 2 cars with the same engine, but one weighs 200 pounds more, should accelerate the same.
#130
Originally Posted by trebien
Actually, it pretty much is the same as in a Buick.
It may have electronics to match revs or hold gears... but it's the same basic fluid-coupled design that's been around for decades... as long as it's got a torque converter, that doesn't change. And neither does it's inefficiency.
I'm not arguing the numbers, or saying that anybody is skewing them on purpose. But it's like saying 2 cars with the same engine, but one weighs 200 pounds more, should accelerate the same.
It may have electronics to match revs or hold gears... but it's the same basic fluid-coupled design that's been around for decades... as long as it's got a torque converter, that doesn't change. And neither does it's inefficiency.
I'm not arguing the numbers, or saying that anybody is skewing them on purpose. But it's like saying 2 cars with the same engine, but one weighs 200 pounds more, should accelerate the same.
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#131
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#132
Originally Posted by gao
yeah, its definitely surprising, and the dynos proved it. Although I'm a manual guy myself, there is really no reason anymore not to get an auto with quick engaging shift paddles. I can live with -3 hp
. What I'm curious to know is the passing abilities of this automatic. It may be optimized for 0-100, but how does it fair at cruising to a sudden WOT. Does it, fro example, take more time to build up the torque converter box before power comes on as compared to the clutch system?
![Big Grin](https://g35driver.com/forums/images/smilies/biggrin.gif)
at 50-60 MPH in Drive mode it's in 5th gear - passing will drop you to 4th
at 50-60 MPH in DS mode the car's in 4th gear and it takes right off with 1/2 throttle which is plenty to pass, it may drop you to 3rd, but I really don't need to floor it to pass.
In DS or Manual mode, if I'm in 3rd gear and I tap the gas, it rips, there is no delay and no build up, it's ready to fire.
I've mentioned this before, but haven't seen any supporting confirmation... I don't think this car has an overdrive, when your driving at 60mph and take your foot of the gas, there is no coasting like most automatics do.. you feel the engine torque pulling you back down. Not like most automatics where the car seems to go into neutral and coast. it will even loose some speed doing downhill driving.
The downshift time is less then a second, about the same as most people downshift in a manual.
The DS mode typically keeps you in one gear lower then the Drive mode, so power is ready to be used. it likes RPM closer to 3000-4000, where Drive mode will always try and push you up to the higher gear.
I will say that I have two "Would like to see's) to make an already amazing auto tranny, even better.
1.) I wish when you are in DS or Drive mode, it would show you what gear your in, right now you have to guess and the only way to see what gear your in is to upshift or down shift.
2.) It would be really nice if when you pull a paddle and hold it, the car stayed out of gear and then when you release it executes the change.
And I'll add that the car shifts smoothly every time, if you drive by the needles you'll see you are getting excellent acceleration during the shifts. but you don't necessarily feel the shift as much as you do in a MT
Downshifting in the auto feels EXACTLY like a MT, it revmatchs and pulls you right down. downshifting to 1st @30mph feels like you slammed on the brakes and in about 100 ft your at 5mph. the Auto tranny will pull all the way down to about 3MPH before it releases... which I found AMAZING! and equally amazing is how you can run it to redline in 1st, take your foot of the gas and it pulls you right back down.. never switching gears on you.
Alright... I'm rambling...
Last edited by kring; 02-23-2007 at 12:12 PM.
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@Jim__Davis (08-31-2012)
#133
#134
This is not the typical 5AT. You can tell that as soon as you step on the gas. the 1st gen Gs had a relatively high stall TC. The new generation is even higher.
ATs are getting better and better at putting down/ transferring power so it is not surprising at all to see the difference be so minimal between the two.
ATs are getting better and better at putting down/ transferring power so it is not surprising at all to see the difference be so minimal between the two.
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