I was reading in another thread that since the wrc has a hp cap and no tq cap, they run high boost at low rpms and are tq monsters and not high strung 4cyl.

How much boost are they running, and how are they able to run high boost at low rpm? I mean the larger the turbo, the higher rpm before it spools right? And our stock turbos max at like 21psi or so. A smaller turbo would spool up faster, but not get the boost required for high tq numbers.

How is this accomplished in the WRC? Is it all a product of antilag keeping a big turbo spooled at lower rpm's?

 

Hence the 15GK2 compressor wheel.

 

I think they said the Subaru WRC car has like 580 ftlbs of torque and 300 hp cap. They run a much larger turbo. From the sounds of it, they run a lower rpm's.....

 

I know that they run up to 45 PSI for sure

 

Mitsubishi's WRC runs at 50-51 psi. The anti-lag system keeps the turbo spinning even at low rpms, which is ard 1500-2000 for the wrc.

 

Yes it is the anti-lag that keeps the boost up at lower rpms. Basically they can have full boost just off idle. The antilag systems are adjustable since very extreme amounts of antilag can make the car hard to drive.



The restrictor the WRC cars run keep the HP down at higher rpms.

 

50-51PSI? That's sick.

 

Is that 50 psi above atm pressure (of ~14.5-14.7psi)? Or is it 50 psi minus atm pressure... ~35 psi of boost?

 

im not sure about that, they did not state it down, but i suppose its above?

 

It's not a HP cap, you'll find some cars with over 300 HP. The reason for the numbers is the 34mm restrictor plate that is placed in the intake. The restrictor plate tends to cap the HP at around 300 HP but there is no specific rule that states HP has to be 300.

 

I believe that there is specific rule of max 300 HP and ofcourse 2.0T

 

That is because physically it could only vary by a few hp. There is a sonic choke for a restrictor if they (the FIA) control the piping and placement (and they do). In other words at 34mm where it is placed on each team, they could have a i4/f4/V6/i6/V8/V10/V12 turbo or non-turbo (etc.) and it only flows enough air to make....300hp. Torque is another matter as the teams have so impressively exploited

BTW I got the "sonic choke" thing straight from the head engineer at Cosworth (who does the Ford WRC engines).

 

Thank you, that was my point. There is no specific rule that says the cars must have less than 300 HP, it's the restrictor that limits it to 'around' 300 HP. The WRC teams are very good at getting every last bit of HP & torque out of these engines .

Like I said in the other thread: Toyota was banned from the WRC for a year after devising an ingenious device that moved the restrictor away from the turbine or simply routed air into the engine without actually passing through the restrictor plate.

 

Anyone have anymore info about the antilag sytem? how does it work?

 

yes please. are there any antilag systems available for our cars... i mean what are some really good ways to reduce spool up time....??