Rally Wrc Monte Carlo 2017

[nafpaktos]

if you switch off the antilag you will have the same push from the engine but some tenths of a second later.am i wrong?it's not up to driver how push will take from the engine?(depends on how much sensitive is his right foot)

[Andre Oliveira]

Bisaha testing to MC, pic by Marcel Svacina

[Mirek]

if you switch off the antilag you will have the same push from the engine but some tenths of a second later.am i wrong?it's not up to driver how push will take from the engine?(depends on how much sensitive is his right foot)

No, not really. It's not like after some delay there would be a full pressure out of the sudden. In fact when You step on the gas without ALS the exhaust gass pressure starts to grow. How it grows the turbo rotation speed grows as well and so does the turbo pressure. It's not a 0-1 step but a curve.

The acceleration of the turbo depends a lot on its size. When talking about situation without ALS the smaller turbos have rather rapid response and give good pressure at low engine rpm but don't bring anything for high engine rpm because the turbo gets beyond its safe rotation speed. These turbos are typical for modern stock engines. They add torque at low rpm but don't add much to the peak power.

The larger turbos which You need for racing give more pressure at high engine rpm but are slow to accelerate from iddle state (due to larger inertia of the compressor and turbine) and also the exhaust gasses at low engine rpm don't have enough energy to propel them, i.e. such turbos don't bring much at low rpm and need ALS or electric motor to speed up their response.

[Sulland]

R classes should be allowed to run narrower wintertyres than WRCar, to create some interesting results.

but to be honost, all rallycars should be allowed narrower wintertyres. Many people that drives much on snow chooses to buy narrower wintertyres from a safety perspective. Same should apply to rally cars.

[BigWorm]

R classes should be allowed to run narrower wintertyres than WRCar, to create some interesting results.

but to be honost, all rallycars should be allowed narrower wintertyres. Many people that drives much on snow chooses to buy narrower wintertyres from a safety perspective. Same should apply to rally cars.

Maybe they count on stages where winter tyres are used could be dry on some or most places. Narrower winter tyrers wouldn't be ideal then.

[nafpaktos]

The acceleration of the turbo depends a lot on its size. When talking about situation without ALS the smaller turbos have rather rapid response and give good pressure at low engine rpm but don't bring anything for high engine rpm because the turbo gets beyond its safe rotation speed. These turbos are typical for modern stock engines. They add torque at low rpm but don't add much to the peak power.

The larger turbos which You need for racing give more pressure at high engine rpm but are slow to accelerate from iddle state (due to larger inertia of the compressor and turbine) and also the exhaust gasses at low engine rpm don't have enough energy to propel them, i.e. such turbos don't bring much at low rpm and need ALS or electric motor to speed up their response.

Where do you classify the turbo of the wrcars?i suppose to relatively small ones since they can switch off the the als if it is needed.

[br21]

You need to remember also that ALS in WRC cars is little bit different than this in R5 (or gpN). That in WRC is not pushing the car that much. In gpN evo with strong ALS when you release your foot from throttle car is still moving, similar with R5, with WRC with fresh air valves it's different. (I'm not 100% sure 2017 WRC cars are allowed to use such type of ALS, but I'm almost sure). So testing such option like driving without ALS makes sense with R5 on very slippery roads, but with WRC usually not (only if it's crazy slippery and then you want very slow/low throttle response). But it's off-topic, sorry.

[Mirek]

You are right, I saw some funny accident with an Evo gn.N on ice with a driver who drove it for the first time. It happened in a speed of walking but he couldn't stop it with the ALS on

I'm quite sure that WRC cars have the air bypass still allowed.

Where do you classify the turbo of the wrcars?i suppose to relatively small ones since they can switch off the the als if it is needed.

The WRC turbo is reasonably bigger than of common stock cars. I would say my 1.4TSI turbo may be roughly half of the WRC one in diameter and also the boost is a lot smaller 0,6 bar compared to 1,5 bar. The rotating inertia grows with a square of the diameter but on the other hand with a WRC engine one has to take into account that the exhaust pressures aren't really comparable with the stock engine.

[br21]

Garrett MGT2260 as an example of R5 turbo, Garrett TR30R as an example of WRC turbo. So you can check and compare sizes on your own.

[dimviii]

or google IHI RX6 was used at Subaru wrc cars.