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Old 01-14-2001, 11:30 AM   #1
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Post What kind of exhaust is on the WRC car?

It looks like a little stocker pos...but I am sure its some free flowing 8" pipe straight back
Neone ahve some info about that??
Also, whats that squeaking noise the wrc car always makes?? I thought it was the suspension, but its always there?
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Old 01-14-2001, 11:32 AM   #2
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i think the squeaking is just the chassis. That's what it sounds like.

as for the exhaust, i'd say: it's a racing one!
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Old 01-14-2001, 11:45 AM   #3
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"Ceramic coated, with three-way catalytic converter" <--- from SWRT website
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Old 01-14-2001, 11:49 AM   #4
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As for exhaust, very freeflowing system with minimal bends.

The squeaking you hear is the gearbox/drivetrain. Everything is very tightly meshed with limited play. About 100 times tighter than our stockers. WRC gears are not made to last forever, they have a limited lifespan.

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Old 01-14-2001, 01:02 PM   #5
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the chirping/squeak is the blow off valve. When they show the incar shots and you hear that intense whine, that is the gearbox. The Peugot 206 is probably the loudest.

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Old 01-14-2001, 01:08 PM   #6
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Correct, the exhaust is ceramic coated and has catalytic converters depending on emmissions for that country of event. They also have equal length headers, hence they sound like a Honda, not a normal turbo Sube
The chirping sound is the blow-off valve. The whole drivetrain and exhaust is attached solidly to the chasis. The rattling is most likely the gearbox and drivetrain. They do have alot of play in the drivetrain. This is one of the things we noticed on a previous Grp A. drivetrain. The rattling is mostly the dog rings in the gearbox spinning freely. Subaru gearboxes are not sequental like other WRC cars. They still use a 6-speed h-pattern, but it is hydralically controlled via shifter paddle near the steering wheel and eliminating the normal floor shifter. As for the lifespan, they do change the whole drivetrain including the tranny between legs. I guess when you have over 500ft/lb of torque, in that caliber of racing, they don't take any chances

[This message has been edited by Ver.III (edited January 14, 2001).]
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Old 01-14-2001, 01:12 PM   #7

THe exaust on the WRC car i beleive is 3" diameter. As far as how its made up, i dont know.

Most rally cars dont have BOV's. They do however have waste gates. The chirping sound is the waste gate. The anti-lag sound is that loud thunderous "BAM! SMACK! SMACK! CLAP! CLAP! POP!" sound you hear when they lift off.

There is pleanty of info reguarding all that else where on-line, so im not going to go into detail about how it works.

The high pitch sustained whine is from the gear box. As someone said, they gears are cut VERY close in tolerance to each other (probibly no more then .002 of an inch). Some of the high pitch squeel can also be from the turbo at max rev's. But that is very rarly heard in rally.

The suspension is very smooth, and doesnt make much noise unless its been tweeked.

Hope that helps to clear some things up.
Old 01-14-2001, 01:32 PM   #8
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Isn't a wastegate the same as a BOV???

The WRC suspension squeeks/creaks becuase it's so stiff and because there isn't any sound deading on the car.

The anti lag is the "bang bang" sound.
http://www.rallycars.com has alot of information on the WRC cars.

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Old 01-14-2001, 01:41 PM   #9
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The noise (not sure what noise you are talking about) is either from Antilag.. or backpressure stalling the turbo..

Antilag equipped cars dont run BOV's.

The transmission will make a very loud whinny noise.... damn gears

Wastegate is used to regulate the turbo.. it allows the exhaust gasses to bypass the turbine wheel.. and hence not allow the turbo to spin and generate boost all the time (or keep it at a constant boost)

BOV is used on the inlet side of the turbo... and is used to vent the pressure between gear shifts.. if pressure remains during shifts it tries to stall the turbo.. which induces nasty strains onto it.. the BOV is used to elimate the back pressure and hence the nasty things it does to your turbo.

Some turbos...and some boost pressures you wont need to run a BOV.. not using one will actually increase throttle response... perhaps at the cost of your turbo life.

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Old 01-15-2001, 12:13 AM   #10
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i thought that the squeaking was from an anti-lag system or the BOV....

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Old 01-15-2001, 12:57 AM   #11
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Yeah, the sequential tranny has to be rebuilt after like every 500 stage kilometers. It's nuts.

Ross N.
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