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Old 03-02-2014, 09:51 AM   #1
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Default What is the difference is performance between 3L Gas and 3L TDI?

I am shopping for a new SUV and RX350 and Q7 are the most likely choices.

For Q7, I know everyone is talking about TDI but what is the real difference in performance? I do not have an opportunity to test drive both side by side unfortunately.

What I am looking for is:

- which one is more dynamic (accelerates better) at 80-100 km per hour speed? I am no worried about taking off from the traffic light first but like an ability to accelerate while I am driving at a cursing speed. I actually hate when a car takes off really fast and then looses all the dynamics.

- how do I read torque specs?

Yes, I understand the fuel consumption is much better with TDI. One of my challenges is that in Canada there are very few options for TDI models while if I build on Gas Tech model, I can add features.
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Old 03-02-2014, 10:18 AM   #2
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Since you are shopping for an RX, why don't you look at the SQ5?
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Old 03-02-2014, 12:18 PM   #3
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Quote:
Originally Posted by B490MTL View Post
Since you are shopping for an RX, why don't you look at the SQ5?
Q5 is too small. I need cargo space.
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Old 03-02-2014, 02:26 PM   #4
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There's a massive difference in size between the RX350 and the Q7.
B490MTL is right, the RX350 == Q5.

In terms of performance, again, chalk & cheese.
There's no-damn-way that I'd (personally) even consider a Petrol Q7. It's a very heavy vehicle and really benefits from having the stomping torque that only a diesel engine can deliver.
Quote:
Originally Posted by KG2002 View Post
how do I read torque specs?
What do you mean "how"?
Torque is a measure of how much a force acting on an object causes that object to rotate. Just as a force is a push or a pull, a torque can be thought of as a twist to an object.

Official SI literature uses the unit newton metre (N m).
Imperial units uses "foot-pounds-force" (ft lb).
Use this online converter to translate between the two.

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Originally Posted by KG2002 View Post
...in Canada there are very few options for TDI models while if I build on Gas Tech model, I can add features.
I don't understand what "features" you're talking about. Explain please?
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Old 03-02-2014, 02:27 PM   #5
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Get a v8 tdi
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Old 03-02-2014, 03:06 PM   #6
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Quote:
Originally Posted by TimU View Post
There's a massive difference in size between the RX350 and the Q7.
B490MTL is right, the RX350 == Q5.
RX350 cargo space is supposed to be better than of Q7. With second row folded. I have no idea how but it is 80 c feet vs 73. Check the specs.


Quote:
Originally Posted by TimU View Post

What do you mean "how"?
Torque is a measure of how much a force acting on an object causes that object to rotate. Just as a force is a push or a pull, a torque can be thought of as a twist to an object.

Torque is usually presented at different rpm. If I see 400 at 2500 rpm vs 400 at 4000 rpm, what is the difference for me?

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I don't understand what "features" you're talking about. Explain please?


With TDI Progressive, you can't add any Lane assist, adaptive cruise control and etc options.
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Old 03-02-2014, 03:06 PM   #7
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Get a v8 tdi
Not an option in Canada ;-)
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Old 03-02-2014, 03:22 PM   #8
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Usually for the torque the higher at a lower RPM the better, meaning you have power from the start. Best thing to do is to go compare both vehicules, I have a co-worker with an RX and it is a lot smaller than the Q7. I am guessibg the extra cargo room is the height because the Q has a very high load floor.
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Old 03-02-2014, 04:23 PM   #9
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Quote:
Originally Posted by KG2002 View Post
RX350 cargo space is supposed to be better than of Q7. With second row folded. I have no idea how but it is 80 c feet vs 73. Check the specs.
You're right, but it depends on your use requirements.

2014 Lexus RX 350:
80.3 cubic feet with 2nd row seats folded
40 cubic feet with 2nd row upright

2014 Audi Q7:
72.5 cubic feet with 2nd & 3rd rows folded
42 cubic feet with 3rd row folded
10.9 cubic feet with 3rd row upright

Quote:
Originally Posted by KG2002 View Post
Torque is usually presented at different rpm. If I see 400 at 2500 rpm vs 400 at 4000 rpm, what is the difference for me?
Vehicle torque values usually mean "Max torque is achieved at this RPM". So with the values above, you're reaching your max torque much lower and faster with the TDI at 2500 rpm, vs 4000 RPM on the FSI.
What this means to you is that the TDI will "feel" like it accelerates faster (from both stopped and cruising speeds) because you can achieve max torque with less RPM than the FSI.

Quote:
Originally Posted by KG2002 View Post
With TDI Progressive, you can't add any Lane assist, adaptive cruise control and etc options.
I bet you actually *can* add them, but they're not included in the online configurator for some reason. Talk to your dealer about what *you* want from your car.
I also note that the TDI Technik pack allows most of the options to be selected in the configurator.

Last edited by TimU; 03-02-2014 at 06:50 PM.
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Old 03-02-2014, 04:56 PM   #10
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RX350 is a chick car!

Click the image to open in full size.
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2013 S5 Cab; Phantom Black/Black, Prestige Package, Driver Assist Package, Comfort Package, 19" 5-Spoke, Carbon Atlas Inlays
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<Gone>2011 Q7 S-Line Prestige; Orca Black/Grey, Towing and Cold Weather Package
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Old 03-02-2014, 04:56 PM
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