light and strong Audi R8 V8
light and strong Audi R8 V8
hi guys
here of the fastest and lightest R8 V8
3112 IB (1412 kg)
481 HP (475PS)
Tom
here of the fastest and lightest R8 V8
3112 IB (1412 kg)
481 HP (475PS)
Tom
Re: light and strong Audi R8 V8
Nice car, why is it so strong?? Do you have a roll cage ?
Re: light and strong Audi R8 V8
Engine optimization > big throttle valves > large air sensor > very big air filters > air intake
Exhaust manifold into compartment shape and modified exhaust system
I did not install a cage for vehicle interior
Tom
Exhaust manifold into compartment shape and modified exhaust system
I did not install a cage for vehicle interior
Tom
Re: light and strong Audi R8 V8
I was just joking about the roll cage, your meaning of strong is a little different to ours, car looks great, nice mods
Re: light and strong Audi R8 V8
Where you from Tom?
Re: light and strong Audi R8 V8
Boy from Germany
I forgot torque > 365 [lbf ft] (495Nm)
During for acceleration 100-200KM/h 7,9s and 100-250 KM/h 17,6s
All data from 2013
Tom
I forgot torque > 365 [lbf ft] (495Nm)
During for acceleration 100-200KM/h 7,9s and 100-250 KM/h 17,6s
All data from 2013
Tom
Re: light and strong Audi R8 V8
15% increase in torque with no valve changes?
Just exhaust and filters?
given that the normal v8 at 317lb/ft is what? 102% efficient you'd need to up that to 117% to get that torque.
Just exhaust and filters?
given that the normal v8 at 317lb/ft is what? 102% efficient you'd need to up that to 117% to get that torque.
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Re: light and strong Audi R8 V8
Looks mean, I like the look of that a lotSpeedr8 wrote:hi guys
here of the fastest and lightest R8 V8
3112 IB (1412 kg)
481 HP (475PS)
Tom
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Gone - 11/06 B7 RS4 Avant - black/black (Daily drive & kids taxi)
Gone - 05/13 B8 RS4 Avant - Suzuka grey (Daily drive & kids taxi)
Gone - 01/14 B8 RS5 Coupe - Short term car
Gone - 09/14 B8 RS4 Avant - Misano Red/Ceramics (Daily drive & kids taxi)
Current - 04/18 B9 Rs4 Nardo Grey
ZX10R Race bike - 210bhp and a few skid marks on the seat
Gone - 11/06 B7 RS4 Avant - black/black (Daily drive & kids taxi)
Gone - 05/13 B8 RS4 Avant - Suzuka grey (Daily drive & kids taxi)
Gone - 01/14 B8 RS5 Coupe - Short term car
Gone - 09/14 B8 RS4 Avant - Misano Red/Ceramics (Daily drive & kids taxi)
Current - 04/18 B9 Rs4 Nardo Grey
ZX10R Race bike - 210bhp and a few skid marks on the seat
Re: light and strong Audi R8 V8
a friend with Audi RS4 B7 has 376 [ibf ft] (510 NM)
My new measurement of the performance and torque carried out on 12.04.2014 with the assumption on 530 NM ( 391 Ibf ft )
Tom
My new measurement of the performance and torque carried out on 12.04.2014 with the assumption on 530 NM ( 391 Ibf ft )
Tom
adsgreen wrote:15% increase in torque with no valve changes?
Just exhaust and filters?
given that the normal v8 at 317lb/ft is what? 102% efficient you'd need to up that to 117% to get that torque.
Re: light and strong Audi R8 V8
376? Now 391?
So you are saying that with a new exhaust and intake some mapping tweaks you have basically the same engine output as an r8 5.2 v10 ??
Increasing torque with an n/a car is bloody hard esp when working with an engine that is already pretty well tuned and operating over 100% efficiency. 5% isn't bad and 10% is very good going.
317->376 without any changes to valves just simply isn't at all likely just with an exhaust and intake.
As for 391 that is going to be pure fantasy.
Get it on an independent well known dyno and then maybe I'd be more interested.
So you are saying that with a new exhaust and intake some mapping tweaks you have basically the same engine output as an r8 5.2 v10 ??
Increasing torque with an n/a car is bloody hard esp when working with an engine that is already pretty well tuned and operating over 100% efficiency. 5% isn't bad and 10% is very good going.
317->376 without any changes to valves just simply isn't at all likely just with an exhaust and intake.
As for 391 that is going to be pure fantasy.
Get it on an independent well known dyno and then maybe I'd be more interested.
Re: light and strong Audi R8 V8
Here's another perspective - by changing just the exhaust and air intake you've got an engine that like for like can outperform one of or possible the best na engines ever made for a road car - The Ferrari 458.
Re: light and strong Audi R8 V8
Hi
Engine R8 V8
Engine RS4 B7 V8
Tom
Engine R8 V8
Engine RS4 B7 V8
Tom
Re: light and strong Audi R8 V8
Ok - so replacing 4-2-1 with 4-1 manifold... But I've never seen gains that dramatic and certainly not so great across the board. There are a couple exceptions but in general 4-1 loses a little in the mid range to a 4-2-1 (which is why most oem's are 4-2-1) in order to hit higher top end however in those graphs it simply has fantastical gains everywhere.
Re: light and strong Audi R8 V8
the engine must unzip throttles are and adjust the camshaft timing it. (ECU )
Tom
Tom
Re: light and strong Audi R8 V8
But look at the maths behind it - 376lb/ft from a 4.2 n/a v8 with 12.5 CR would need to have a volumetric efficiency of 121% in order to get the air in it'd need. There are turbo charged cars out there not getting that.
For 397 you are looking at 128%... That's race car territory...
Yes it can be done but you need valves the sizes of dustbin lids and incredibly careful tuning of everything both inside and outside the engine. Aside from slapping on a supercharger there is no way you can go from 102% VE to high 120's% without cracking open the engine and binning half the stuff you find.
For comparison the 458 is 119% VE which is frankly astounding for a road car.
For 397 you are looking at 128%... That's race car territory...
Yes it can be done but you need valves the sizes of dustbin lids and incredibly careful tuning of everything both inside and outside the engine. Aside from slapping on a supercharger there is no way you can go from 102% VE to high 120's% without cracking open the engine and binning half the stuff you find.
For comparison the 458 is 119% VE which is frankly astounding for a road car.
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