JETPILOT

To make 300hp NA in a 4 cylinder would be prohibitively expensive. It would be so much cheaper to put a turbo on the car. So if he's poor there is no way he went that route. That would be huge money in cam's, heads, possibly a stroker kit, high compression pistons and labor and with high compression to make that much power he would likely be running on race gas @ $8 a gallon. No way.

Respect
JET

Roarin_8

iTrader: (5)

How much displacement does his 4 cylinder have? Obviously it's easier to do with the larger displacement 4s than the smaller ones.

Bajapat

iTrader: (2)

OK I'll pipe in here for the 4 bangers of subaru land.

September 20, 2005

Zzyzx Motorsports Impreza 2.5 RS breaks 300 NA horsepower

TechWorks Engineering (Calgary, Alberta, Canada), Dieman Motorsports (Lees Summit, MO) and Zzyzx Motorsports (Overland Park, KS) conspired to build the most powerful normally aspirated Subaru 2.5L Flat-4 in North America. At more than 300 CHP, the output shatters any previously documented efforts to date.

Utilizing an MD Mustang IMP dynomometer, the engine output hit 235 WHP at 6450 RPM and 209 WTQ at 4600 RPM. "We typically see 233 WHP for a WRX STi, which is rated at 300 CHP, comments Jake Diehl, owner of Dieman Motorsports. "This engine puts down roughly 185 WTQ at 2000 RPM and carries a nearly flat torque curve up to 4600 RPM where it makes 209 WTQ, then tapers off to roughly 185 WTQ at 6500 RPM. Though the peak of 209 WTQ is at 4600 RPM, peak numbers don't readily describe the output of this engine. There is more power under the curve than any stock STi can wish for. Based on the average WRX STi, WRX and 2.5 RS data for our dyno, we're looking at peak outputs of roughly 302 CHP, and 276 CTQ."

The longblock was built entirely by TechWorks Engineering. "The recipe for the engine is less exotic than most would guess.", comments Tom Penner, owner of TechWorks Engineering. This engine uses our off the shelf 11.2:1 CR forged pistons, Stage II SOHC Street cams and headwork to maximize both velocity and flow. We consider this a Stage III engine build as it requires high-octane gas and stand-alone engine management, but simply lowering the compression ratio would still yield impressive output in a more streetable configuration." The TWE headers are a race-only 4-2-1 design, with large primaries. "The design of the headers was twofold: to provide power up top, and to lower dynamic compression in the lower RPMs to avoid torque spikes and detonation.", comments Tom. The trough in the torque curve from roughly 3000 to 4500 RPM is a direct result of the header design.

"I knew we needed to find a different intake manifold as the pre-2005 designs clearly are not meant to make power up top; this is a well documented.", comments Steve Sulatycki, owner of Zzyzx Motorsports. "Looking over the options, it appeared the 2005+ 2.5 RS intake manifold design was clearly superior and I decided to mate a high-flow 65mm throttle body to the '05 intake manifold. I had no idea what kind of numbers we'd be making."

"Once the car made it's first 220+ horsepower pull with very little timing and 11.5:1 AFRs we knew we had a strong motor on our hands. I proceeded to level out the AFRs to a very conservative 12:6:1 AFR and we started making pulls in the 230+ WHP range.", comments Jake. "As this engine was built and is being used for road racing, we stayed with a conservative tune for longevity. This is no dyno queen, and these numbers are real-world, not one-offs."

"The engine makes power everywhere", comments Steve. "This kind of power is useable on the street, at an autocross or road racing. It's perhaps the most versatile power delivery you can ask for and the flat torque curve results in a very predictable and controllable chassis when you have the car at it's limits."

The dyno graph is available at the Zzyzx Motorsports website.

Contact Info:

Tom Penner
TechWorks Engineering
403-288-8568
http://www.techworkseng.com


Jake Diehl
Dieman Motorsports
816-347-1950
http://www.diemanmotorsports.com


Steve Sulatycki
Zzyzx Motorsports
913-706-5496
http://zzyzxmotorsports.com

Hoss Ghoul

iTrader: (2)

Porsch 968 N/A 3.0L 4 cyliner...def capable of over 300hp N/A....
16 valve DOHC in-line 4, aluminum block and heads
Bore and Stroke: 4.09 x 3.46 in (104.0 x 88.0 mm)
Displacement:182 cu.in. or 2990cc
Horsepower: 236@6,200 rpm
Power to weight ratio: 13.1 lbs per horsepower
Compression ratio: 8.3:1
Cd: .34
Fuel system: Sequential multiport, DME controlled

Porsche 968 Turbo ...but the Turbo gets you there fast and easy.

0-60mph: 5.9 seconds (Tiptronic; 7.0s)
0-1/4 mile: 14.4s (15.1s)
Top Speed: 156 mph (Tiptronic; 153 mph)

8 valve SOHC in-line 4, aluminum block and heads
Bore and Stroke: 4.09 x 3.46 in (104.0 x 88.0 mm)
Displacement:182 cu.in. or 2990cc
Horsepower: 305@5,400 rpm
Torque: 369 lb-ft@3,000 rpm
Power to weight ratio: 9.5 lbs per horsepower
Compression ratio: 7.5:1
Cd: .34
Induction: Water cooled KKK turbocharger with bypass valve w/separate gate; lambda controlled, three-way metal cat.
Max boost pressure: 1 bar
Fuel system: Sequential multiport, DME controlled

0-60mph: 4.5-4.9 seconds
0-1/4 mile: 13.0 @ 112 mph
Top Speed: 175 mph, at least

BlueSix

A k24 block with a k20 head and a set of cams will put you near 250 whp (assuming supporting bolt on's and a tune of course). A sleeved block and a stroker crank and a little head work will get you very close to the 300 whp range.

Roarin_8

iTrader: (5)

Damn a 3.0L 4 cylinder, almost the size of a 6.

NeoPaladin

FYI, that's not a Porsche 968. 968's were the V8 powered Porsche's. The one that you are talking about with the 3.0L 4 is the Porsche 944S2. The turbo is, of course, the 944 Turbo, AKA 951. And the 305HP turbo that you're referring to is the VERY limited edition Callaway 944. Yes, the same guys that twin-turboed the Corvette hotted up the 944 Turbo as well.

944's were some of the greatest cars that Porsche ever made. In the 1980's, nothing could touch a 944 Turbo except for a Callaway Corvette or a Ferrari F40. Of course, back then they were priced as such.

I will own one someday. They are the coolest cars from the 1980's, no question.

ZFan88

iTrader: (4)

Ha, I have a 2.5L V6.....so sad

FormulaV8A4

http://www.personal.psu.edu/users/d/...42/DanRace.JPG

Xtnct00WS6

iTrader: (8)

And that's the car you're doing 15.1 with?

What I don't get is why people put any kind of money into a motor/car that's running 15.1

I hear of ricers putting thousands of dollars into their car's just to get into the 13's. Why?

BrandonDrecksage

iTrader: (1)

well..if you read correctly..it said, "all stock. best 1/4 - 15.1@97.19 (clutch is shot)"

so why is he a ricer? he put a lil over 1k into it?

Xtnct00WS6

iTrader: (8)

First of all, I wasn't calling the guy a ricer. I don't know anything about him. And he does have a V8 forumla so he's prolly not. The 4 cylinder car is borderline though I was making a broad statement when I was talking about Ricers in my last post. Maybe you need to read things more carefully

Thanks, but I read the post just fine. I was asking if the 15.1 car was the same one that now has the 300hp 4 cylinder.

BLKWS.6

I had a chance to buy a Porsch 944 S2. It needed some work and i researched it and it would have cost me 5k just to get it tuned up and all the maintenence done...most ppl sell them after 4-5 years max and the smart ones only lease. (unless you like the pride of ownership deal)

Hoss Ghoul

iTrader: (2)

Sorry, you're wrong. The 928 is the V8. The 968 was the succesor to the 944/951 and featured a 3.0L 4 cylinder. They also had a limited run of turbo models.

Hoss Ghoul

iTrader: (2)

http://www.connact.com/~kgross/FAQ/944faq02.html

Info on the 924/944/968

The 944 Turbo never exceeded 2.7L in displacement and was replaced by the S2 with it's 3.0L displacement before the 968 was introduced.

And I agree the 944 is an awesome car, that's why I bought the poor mans version: A 924S(produced 1987-88) which is essentially a 944 with a 924 body and interior.

FormulaV8A4

well,i haven't had the chance to run it yet. tonite tho...should be mid-high 12's@ about 110ish...the car only weighs 2315lbs. but yeah,the 15.1@97 was all stock,(bad clutch),in Denver,with a rat nest or something in the airbox. stock specs are 14.6@97. and,yeah most people don't understand these cars...but hey,most people i see,have a hard time breaking 14's with minor blt-on LT1's and LS1's... but hey,i'm not tryin to start $#!t here,was just sayin 300hp can be done on a 4cyl... and some people enjoy more than just v8rwd...

300bhp/ton

yeah, but 300bhp let alone 300rwhp is pretty rare from an n/a 4 cylinder car.

Power adders aside there is only really 2 ways to make more power and that is capacity or rpm increase.

Now with 4 cylinders you can only have so much capcity before high rpm becomes too dangerous.

A 3 litre 4 banger should certainly be capable of 300bhp, but it will have to be a fully blown race engine, with no bottom end grunt.

A class 1 BTCC 2.0 litre touring car only makes ~270bhp, even the class 2 cars which don't even use the road cars engine block stuggle to break through 300bhp n/a and these are fully computer controlled £100,000+ race engines.

Caterham make 260bhp from a Ford 2.3 litre Zeetec unit. Think that's about the highest I seen for a production n/a 4 cylinder unit.

BLKWS.6

the 944S2 at around 200bhp at one time was the worlds most powerful NA 4-cyl. Now the S2000 hits 240 flywheel and i head people with the 2.5L (?not sure on displacement?) stroker area at about 250 rwhp and thats clsoe to 300bhp.

NeoPaladin

D'oh!

Hoss, you're correct. I must've been slightly retarded when I posted. Hell, I've read the 944 FAQ front to back. Don't know what I was on yesterday.

Anyway, love the 924. In terms of a reliable Porsche, I don't think you can get much better than them in terms of performance vs. reliability (except maybe the old 930 Turbos )

Some day, I'm going to have a garage with all of my favorite cars from the 1980's in it. Corvette Z51, Porsche 944, 300ZX Twin-Turbo. Neat.

BLKWS.6

Add to your nice 80's car collection the limited edition TT 89 mustang 5.0 (if you can find one, they were test car only) and the Buick GN as well as the TA GTA.