Thứ Ba, 3 tháng 1, 2017

Any one know the Impreza WRC car's specs? part 1

impreza_wrc2k1 11-06-2001 09:55 AM

Any one know the Impreza WRC car's specs?
 
just curious. Any one have any info? thanks.:D
HomerJay 11-06-2001 10:47 AM

HP: 350
Weight ~ 2800
6speed transmission
go to the swrt web site.
impreza_wrc2k1 11-06-2001 10:50 AM

does anyone want to explain why its so fast with only 350hp and around 2800 pounds? i dont really understand i thought that it would have more power or at least weigh less.:confused:
skidplatez 11-06-2001 10:55 AM

It's the torque
 
They won't show you the torque curve but if you watch WRC you can tell that it has gobs of torque all over the rpm range.

Besides it's not THAT fast, in terms of ultimate speed. It just looks way faster than other cars because of the insane conditions that it's going fast in (narrow roads bad surfaces etc.)
Impreza Rider 11-06-2001 11:00 AM

Here you go:

[url]http://www.swrt.com/team/car.asp[/url]
Mel 22B 11-06-2001 12:41 PM

[QUOTE]For asphalt use, 366mm ventilated discs with 6-pot water-cooled calipers on front.[/QUOTE]

Are those good brakes?

-Mel
skidplatez 11-06-2001 12:47 PM

[QUOTE]Its very, very fast. 350hp, wayyyy over 400 lb/ft of torque...basically an AWD bullet.[/QUOTE]

Yes but when compared to other racecars like F-1, CART, trophy trucks, transam,etc. it's kinda underpowered. They all run over 500 hp and weigh about the same or less.

I'm not dissing WRC, it's my favorite form of racing but the speed of the modern cars in non-rally conditions are greatly exagerated.
Dan_E 11-06-2001 12:48 PM

Na, Nitrogen cooled brakes are much better. :D Silly rally team techs...

:lol: well I crack myself up anyway
Mel 22B 11-06-2001 01:01 PM

I was off on the figures, ops.
All WRC cars are limited to 300 hp (what was I thinking? HomerJay talked me into it :) ) and the torque looks to be about 350 ft/lbs (347.18 ish). My guess would be the actual torque is still over 400 tho.
What I should have said is that WRC are f'in quick. 0-60 in about 3 seconds seems fast to me.

-Mel
HndaTch627 11-06-2001 01:37 PM

Bah...zero to 60 in 3 seconds on gravel?? that's NOTHING!!!!!!! j/k....those things are monsters I thought the open class car's ran unrestricted and it was the GRoup N cars that had the 33 MM turbo inlet restrictor.

jeremy
Thug 11-06-2001 02:36 PM

WRC cars have a restictor as well I believe.
Mel 22B 11-06-2001 03:39 PM

There is some interesting WRX Rally Car info here:
[url]http://www.subarurallyteam.com/[/url]
Look under 'WRX'.

40 mm restricter, 400 hp...nice. :D

-Mel
johnfelstead 11-06-2001 03:50 PM

You guys crack me up. :lol:

The WRC cars use a 34mm restrictor, same as GroupA. GroupN cars run a 32mm restrictor, this will be aplied to PGT cars in pro-rally in 2002 also.

WRC (groupA) cars "officially" have been restricted to 300BHP by the FIA ever since they banned the groupB monsters of 1986. As technology improved the restrictor sizes were dropped from 40mm to 34mm.

WRC cars actually produce around 330BHP but an incredible 540Lb/ft of torque! My own teams GroupA privateer Escort Cosworth produces 330BHP and 480Lb/Ft of torque!

In the forests the cars are geared for around 125MPH top speed so the acceleration is pretty phenominal. The real gains made in the last 3 years have been in active transmision systems, they make a huge diference to the performance of the cars.

These cars are quite heavy in comparison to an F1 car but it's pointless comparing diferent competition cars because they are all made to specific regulations.

P.S. The canada rally WRX is not to FIA groupA/WRC regulations, hence the 40mm restrictor.
Mel 22B 11-06-2001 05:28 PM

John you are way off.
WRC cars actually use twin jet engines much like the ones found in an F-14. The power output is somewhere near stratospheric. However since they use a 1 metre restrictor the BHP is rated at about a million and the ft/lbs of torque for the car is just below a billion.
Now that everyone is clear, you're welcome.

-Mel
johnfelstead 11-06-2001 05:55 PM

I'll get my coat. :lol:
Jon Bogert 11-06-2001 06:25 PM

Stay. Have a drink. :)

How does one tune a 330 hp engine to make 480 lb-ft of torque? Since the horsepower is (relatively) low, I assume that torque peak is at fairly low RPM. Small turbo running very high boost at 3500RPM tapering off towards redline, maybe?

Give me a hint.
johnfelstead 11-06-2001 06:40 PM

spot on jon.

the problem with restricted turbo engines is the air tries to go supersonic in the compressor wheel entry so your limited to the revs you can run. You also have to run the engine closer to N/A compresion ratios.

Traditional big power turbo engines run low compresion (7.2:1) and large turbines to give high flows with relatively high boost. The bigger the turbine the lower the boost needed but the higher the lag etc. you also have a simple boost curve with high boost being held all the way from 4500rpm to 7500rpm then tailing away.

The WRC engines run high compresion (we run 9.4:1, the works cars are running closer to 10:1) and fairly small turbo's. The interesting part is the boost curve is all upside down to a traditional one. To gain good boost control you need very acurate control of the waste gate, we use air injectors to do this on the waste gate actuator. We are running 34psi boost at 3000rpm and as the revs get towards 6000rpm the boost is dropped away, by 6800rpm the engine is pretty much dead. You do most of your work between 3500 and 6000rpm.
HomerJay 11-06-2001 09:46 PM

Who is this wanker? ;) j/k

It's nice having your around John to straighten us yanks out.
:D
HndaTch627 11-07-2001 04:47 AM

what would we do w/o jon to set us all straight :D

No really i've always been into rally and would some day like to start a team. But it's money and i have none at this point :( Thanks for all the specs and your input.

Jeremy
Jon Bogert 11-07-2001 09:52 AM

Thank you for the explanation. One last Q: what turbo can make 34psi at 3000 rpm on a 2000 cc motor (because I want one for my Celica)?
orbit03 11-07-2001 10:31 AM

[QUOTE][i]Originally posted by johnfelstead [/i]
[B]I'll get my coat. :lol: [/B][/QUOTE]

HA HA! Am I the only one to get the reference to "Brilliant"? That is one of the funniest shows ever.

:D :D :lol:


BTW, thanks for the continuing enlightenment on how WRC cars work.

Also, while we're talking about it... We now know that WRC don't have BOV's and in general BOV's aren't needed on smaller turbos etc.. Then why do the group N cars have them and how does the anti-lag work on a group N car? Thanks ahead of time!

Jason
Thug 11-07-2001 10:47 AM

Where did you find that WRC cars dont have BOV's?
orbit03 11-07-2001 12:24 PM

[QUOTE][i]Originally posted by y2k4door [/i]
[B]Where did you find that WRC cars dont have BOV's? [/B][/QUOTE]

It comes from our resident WRC expert, Mr. John Felstead.

:)
In2Deep 11-07-2001 01:45 PM

[QUOTE][i]Originally posted by Jon Bogert [/i]
[B]Thank you for the explanation. One last Q: what turbo can make 34psi at 3000 rpm on a 2000 cc motor (because I want one for my Celica)? [/B][/QUOTE]

Check out the November issue of SCC magazine... page 170. The two liter (stock block) Saab in that article uses a T04S to produce enough boost for 850hp!!! :eek: @32.3psi They run the car at 32psi which gives them 760hp... that's 380hp per liter! :eek:

Which goes to show you... your car can be as crazy as you are if you have the right amount of money ;)
peepshow 11-07-2001 02:15 PM

Yeah, but is it making 32psi @ 3000RPM?
johnfelstead 11-07-2001 02:29 PM

[QUOTE][i]Originally posted by Jon Bogert [/i]
[B]Thank you for the explanation. One last Q: what turbo can make 34psi at 3000 rpm on a 2000 cc motor (because I want one for my Celica)? [/B][/QUOTE]

You need a special hybrid version. We use a Hybrid based on the T34 Garret that has a 360 degree thrust bearing to withstand the loadings generated. We also have an inconel shaft in the turbo to withstand the heat of the ALS, temps go balistic with ALS. The exhaust blades on the turbo are modified also to give aditional clearance because as the turbine gets so hot it expands and a standard turbine would grow enough to hit the housing and take the blades out. The exhaust turbine is small in relation to the inlet turbine to give low speed drive. I have attached a picie of the engine bay, the turbo is on the left. The blue on the inlet is the turbo restrictor. The aeroquip fittings on top of the cam cover is a quick shutoff valve to stop the oilflow if the turbo fails mid stage. This is also a quick release coupling. The turbo is mounted on a quick release system, takes about 5 minutes to swap over.

GroupN cars run BOV's because they are production car based regulations. The Anti-lag systems on the GroupN engines work diferently to the groupA engines and isnt as efficient. On the groupA engines we can replace components and install special air bypass valves to give us the agresive ALS systems.

Rallying is silly money really. We spent over $50,000 just running our car in 1999 doing everything ourselves. We competed against people spending over $500,000 in one season (and kicked their asses :lol: ). Remember this is club level competition! One of our main rivals that year ran kankunens last WRC escort and had MSport run it! We finished second to him by just 6 seconds on one event, that was a hell of a result. That car was destroyed on the next rally by fire, $500,000 car up in flames right in front of me. Totally gutted by that. Brian went out the next week and had MSport build him a new one! He is VERY, VERY rich. :lol:
johnfelstead 11-07-2001 02:36 PM

[QUOTE][i]Originally posted by In2Deep [/i]
[B]

Check out the November issue of SCC magazine... page 170. The two liter (stock block) Saab in that article uses a T04S to produce enough boost for 850hp!!! :eek: @32.3psi They run the car at 32psi which gives them 760hp... that's 380hp per liter! :eek:

Which goes to show you... your car can be as crazy as you are if you have the right amount of money ;) [/B][/QUOTE]

Thats nothing.

1.5litre turbo F1 engines produced 1400BHP :lol:

The T04 Turbo is HUGE, I have a mate who runs a road going sapphire cosworth with a T04 installed. That produces 540BHP. It's very laggy though. Nothing below 4500rpm at all and doesnt really start pulling till over 5000rpm.
impreza_wrc2k1 11-07-2001 07:19 PM

wow didn't expect this many responces. Thanks Guys.:D

BTW please excuse- I need it for something else;) :
Harrison 11-11-2001 12:43 AM

You were talking about eh 1.5 liter puting out 1400. Was that done by the BMW in the 70's? because i think reading about BMW producing the highest horsepower per liter of any F-1 car.
johnfelstead 11-11-2001 06:30 AM

The Turbo era really took off in 1983 when BMW came to a deal with BASF to produce some special Fuel that still met the definition of petrol but was seriously potent. BASF introduced Toluene and turned petrol into rocket fuel. :D
It all ended at the end of 1987 when Turbo's were banned and they went back to N/A 3.5litre engines.

Monza, 1986, Gerhard Berger saw 5.5 BAR (80PSI) Boost in his BMW/Benetton. That was calculated at 1300BHP. They aren't sure what they actually saw max as the dyno gave up at 1100BHP :lol:

The reason they could run such high power and boost was mainly due to the fuel being used. The turbo era did one huge thing for mainstream cars. It introduced high speed computers into cars to manage the engine management systems and led to the development of the Webber, Bosch and Magneti Marelli ECU that most road car ECU's have evolved from. At the start of the turbo era F1 engines were still using high presure mechanicaly metered fuel injection systems.

Honda and BMW were the best engines in the Turbo era.
The BMW engine was built using the Cast Iron 4 cylinder block of 1962. It was a genuine production engine block. Everything else was a bit special though! ;)
WRSport 11-11-2001 01:34 PM

John, I think you should just start a post, Topic is your choice, and just keep writing. I'm allways amazed at the knowledge you can pull up.

Either that or write a book, Actually yes, you need to write a book!!!

Again, this was meant as the highest compliment.
SSJ Char 11-11-2001 02:53 PM

Ive always wanted to know how fast the WRCs could run the 1/4 mile. and since they can go from 0-60 in 3 seconds, and tops out at around 120, im guessing they can do it... well faster than a streetcar :D
johnfelstead 11-11-2001 07:02 PM

I wouldnt mind writing a book, it would be a fun thing to do.

I could write a few actually. ;)

Probably my favourite subjects would be
1) developing an open rules sports car from last on the grid to pole position in 12 months. Did that with the Esprit GT car i built with my pal.
2) Prototyping a 5 litre race engine based on a 3.5litre production block and seeing that compete in the FIA World sports car series. Did that with my friend Ian Richardson, Ian was the genious, i sorta helped, I hand ported the first heads he cast that became the basis for the production heads used by Morgan in their 5 litre V8 that raced at Laguna Seca amonst others. This engine then went on to be twin turbocharged and used in the MGX land speed record car driven by Andy green of Thrust SSC fame. (947BHP). Ian built the GT40 engines that won Le Mans for Jacky Ickx, I learned so much from Ian, brilliant engineer. I could write a book on him actually. :lol: He worked for JW Automotive (John Wyre) on the GT40 project, he left when John took over the Porsche 917 project to race a McLaren Can Am car for money round europe in the interserie. Amazing bloke. One of my prize possesions is the throttle pedal from Jacky Ickx Porsche 917 Le mans car that Ian gave me. :D
3) Working as a team to build a competitive car on a shoestring and lead a British National Rally Championship against full spec WRC works cars. Did that in 1999.

There are loads of subjects i could cover but who the hell would buy the books? No one knows me. :lol:

The real genious's like Ian never get written about, you get lots on the drivers but they would be nothing without the engineers who are inovative and adaptable. A book on Ian would be very interesting, he used to be the most succesful Cobra racer in Europe, held the lap record at every UK track one year. He ran a business that specialised in these cars and amongst his clientel were the king of jordan who used to ship his car from jordon to be serviced by ian! He built the most nuts race car the UK has ever seen, a chevy corvair body that was sat over a 9 litre McLaren M8F Can Am car. He raced on the F1 suport Calender in that thing. :lol: His last race car was the Mirage World sports car that raced against the Ferrrari sports car driven by Mario Andretti in 1972. Its featured on the Video " the speed Merchants".

Ian now lives in a house built in 1500 on the top of a hill in the middle of wales. The interior is from all the timber from a spanish Galeon sunk in the spanish armada. He has his own hydro-electric generator powered by a stream next to his house and sells electricity to the national grid. :lol:

A real excentric genious, If you saw him in the street you wouldnt bat an eyelid. Hell, i'll post a piccie of this guy, smartest engineer i have ever met. You wouldnt think he was worth a few Million would you? :lol: The car he is stood next to is a Skoda Special saloon, another hand built car, thats 580BHP of 2 litre Turbo power and 800Kg with F1 suspension, gearbox etc. My kind of car. :D

Has this thread gone OT or what! :lol:
johnfelstead 11-11-2001 07:26 PM

This just tickled me. The dash from the Skoda. Proper boost guage. :lol: The guy who drives this car is 67 years old, won more races than anyone bar one in 1999 in the UK. Another amazing character.
synapse79 11-11-2001 08:19 PM

i just wanted to say..

what a nice conversation..

=)
synapse79 11-11-2001 08:25 PM

and f1 cars are restricted to 3.0 liters now.. and make around 800normally aspirated hp..

i thought wrc cars would be lighter also.. do they run weight.. cuz they are stripped, and the guys aren't packing 12s.. i don't understand how a stripped race car can be so heavy..
Impreza Rider 11-11-2001 08:49 PM

Roll cage, seam welding, underbody protection, etc.

It all adds up ;)
synapse79 11-11-2001 09:05 PM

but like somebody was saying, their rally car weighted in around 2100 pounds.. cages and skid plates don't weigh 7-800lbs.. since these cars are backed by large corporations, i bet they have some pretty cool, and light weight, parts.. which makes me think they must be required to run weight..
johnfelstead 11-12-2001 11:11 AM

Min weight limit under FIA WRC car rules is the reason. They run ballast.
10th Warrior 11-12-2001 12:15 PM

R&T had an article on 1/4 mile times of various trick cars a couple of years ago. for comparision, they had some times for race cars that they got from the teams, including SWRT. it ran a 12.xx but the cool part was that til about 60mph, it was hanging with the F1/CART cars puting out three times as much hp :D i'll see if i can find the article when i get home. btw, one of the cars R&T tested was Rod Millens pikes peak tacoma. the only thing they did was lengthen sixth gear so it could accelerate the entire distance :lol: that means it ran a 9.xx with huge amounts of downforce, not so great gear ratios, and gravel tires :cool:
synapse79 11-12-2001 12:27 PM

i saw that article, it was really cool..

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