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Insight6

join:2012-08-25

1 edit
reply to CylonRed

Re: V8 high performance: 4matic v RWD

said by CylonRed:

In general - a limited slip diff or 4 wheel drive will be best for performance driving.

The main thing to think of - 4 wheel drive is going make the car heavier and will change the driving characteristics (at least it can).

Good post but we are still not on the same page.

First off, I'm sure you meant all wheel drive when you said 4 wheel drive but I just wanted to point it out so we are thinking about the same thing.

I'll put it to you this way. Say I have two V8 high performance and high quality vehicles. One has all wheel drive and the other has RWD. They are otherwise identical. We electronically tune the horsepower of the vehicles to compensate for the extra weight of the 4matic drive.

We take the cars to the Nurburgring track and run a lap as hard as we can with a professional driver. The weather and track are ideal conditions with a perfect track. I know which car will be faster. What are the handling differences between the two cars?


mob
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said by Insight6:

We take the cars to the Nurburgring track and run a lap has hard as we can with a professional driver. The weather and track are ideal conditions with a perfect track. I know which car will be faster. What are the handling differences between the two cars?

The heavier car will scrape more often, bottom out more often, bumpsteer will be a bigger problem, etc. The heavier car may need different tires and springs to cope with the added weight.

Some speed shops will take a client Lamborghini with AWD and convert it over to RWD only....just putting that out there.
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reply to Insight6

said by Insight6:

We electronically tune the horsepower of the vehicles to compensate for the extra weight of the 4matic drive.

LOL at the marketing BS.
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The talented hawk speaks French.


Insight6

join:2012-08-25

said by Cho Baka:

said by Insight6:

We electronically tune the horsepower of the vehicles to compensate for the extra weight of the 4matic drive.

LOL at the marketing BS.

Marketing BS? What I mention is done all the time for testing purposes in modern high tech high performance autos. It's not a marketing issue or venue. Usually the electronic adjustment or tuning is to increase the output. So in our hypothetical the most likely scenario is to increase the HP in the 4matic to offset the increase in weight of the 4matic drive over the RWD.


Cho Baka
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Yes, I suppose they use an Adjustable Powerband:
»kalecoauto.com/index.php?main_pa···ts_id=36
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The talented hawk speaks French.



Insight6

join:2012-08-25

As I am sure you know modern high performance engines in production or passenger cars are chip tuned to impact the firmware of the EMS. The engines normally are detuned to produce less than their maximum power to among other reasons increase the life of the engine and gas mileage. There are, of course, other adjustments or modifications that can be made but that is the procedure that I was specifically referring to in my previous post.

In a high performance V8 the power can be electronically increased to more than compensate for the extra 200 pounds of a 4matic drive in for instance a Mercedes E550. It’s a quite simple electronic adjustment when done by a skilled technician



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said by Insight6:

As I am sure you know modern high performance engines in production or passenger cars are chip tuned to impact the firmware of the EMS. The engines normally are detuned to produce less than their maximum power to among other reasons increase the life of the engine and gas mileage. There are, of course, other adjustments or modifications that can be made but that is the procedure that I was specifically referring to in my previous post.

In a high performance V8 the power can be electronically increased to more than compensate for the extra 200 pounds of a 4matic drive in for instance a Mercedes E550. It’s a quite simple electronic adjustment when done by a skilled technician

It's technically possible to sit a workstation, build a tune and load into an ECU without a dyno for tuning purposes, you'll probably not like the results.

And yes, some ECU profiles are made to increase the service life and reduce operating costs. That being said, when you start dropping $100,000 plus for a car, the chances that an ECU profile update can wring out enough extra power to compensate for an extra 200lb on the vehicle is probably going to happen without upgrades or an additional power adder being installed on the engine are not good.

100lb roughly translates to .1 second in a drag race, so they would have to make the AWD car "faster" just to keep up with the RWD only model, just to stay equal in terms of absolute performance.
--
Ich habe kein Mitleid - Me
You're a daisy if you do. - Doc Holliday
And as always, have nice day.