Dinan BMW S2-M5

[Mustang]

Add a big wing. Slap on some decals. Slam it with some Konis. K&N filter goes without saying. Presto, 60 extra horsepower! It might really be just that easy to squeeze a good amount of extra dosh from your average runabout powerplant, but when it comes to highly tuned and extensively developed cars, getting any power increase requires extensive (and expensive) reworking of the engine internals. So for Dinan to squeeze 76 more horsepower and 51 lb-ft of torque out of the BMW M5's naturally aspirated 4.9-litre heart witout any really major modification or forced induction is really something impressive. How did Dinan do it?

The performance oriented modifications include larger, better-flowing airboxes, air flow meters and throttle bodies, with larger-diamter velocity stacks, freer-flowing Dinan-made headers and exhaust system and a lighter flywheel. The real challenge was to reprogram the engine computer to take full advantage of the imporved breathing, which has to be set up just right in order to keep one unbalanced parameter from throwing the whole car out of whack. A shorter final drive (3.45:1 vs 2.81:1) gives the S2 even more punch from its newfound power, without compromising its freeway ride. At 80mph in sixth gear, the S2 holds a relaxed 3000rpm. There area also slightly stiffer springs and shocks, front strut and rear shock tower braces, special forged aluminum wheels, wider tires and cooling ducts that direct air to the front brakes. Finally, Dinan gives you some badges and most importantly of all, new floor mats!

By now you've probably figured out that the Dinan S2-M5 should handily outgun the stock M5 in pretty much every performance test, which it does. To 60mph it's more than half a second quicker. With a redline now sitting at 7300rpm and no speed limiter (it mysteriously vanished) the S2 M5 could theoretically reach 191mph, which is not too shabby for a 4000lb sedan. Of course, all go and no show is what Dinan's machine would be if it compromised the M5's balance for straight line speed. Fortunately, the S2 has the same combination of resilient ride and well-controlled body motions as the M5, but with even more grip and instant throttle response. For $25,956 Dinan will even match BMW's four-year warranty. Sweet!



Yep, it's just a stock M5, but the Dinan looks the same

Specifications


Base Price, USD 96,356
Engine Type dohc 32-valve V8
Powertrain Layout front engine/rwd
Displacement, cc 4941
Horsepower@rpm 470@6900
Torque lb-ft@rpm 419@5000
Curb Weight, lb 3995
0-60 mph, sec 4.1
1/4 mile, sec@mph 12.7@113
0-150 mph, sec 25.1
70-0 mph, ft 163
Top Speed, mph 191 est.

[Mustang]

Has anyone else got any information about this car that they could give me i really like it

[deffenbaugh03]

If you didnt get this information off of www.dinancars.com then you should try there.

[Mustang]

Originally Posted by deffenbaugh03

If you didnt get this information off of www.dinancars.com then you should try there.

haha thanks alot maybee i should of thaught about that before i asked

[cuntukimushroom]

cool my dad has a BMW 745i

[Mustang]

Originally Posted by cuntukimushroom

cool my dad has a BMW 745i

oow is it the old shape 7.45 i like them alot better than the new ones.

[cuntukimushroom]

yep its one of the old ones

[bk4uyeah]

I recall and article in Car and Driver about this special M5 about a year ago, i'll see if i can find it

[bk4uyeah]

Ahh here it is:

Specialty File: Dinan S2-M5

One of our favorite rides goes under the wrench and—surprise!—emerges a better car.
BY LARRY WEBSTER
PHOTOGRAPHY BY AARON KILEY
November 2002

Here's a shocker: We don't know a single automotive tuner who spends his leisure time under a shady tree reading William Shakespeare. So it's a good bet that tuner Steve Dinan will be reading the following warning from King Lear for the first time: "Striving to better, oft we mar what's well."

Not a problem, apparently, because with Dinan's latest work of art, he has not only fixed a car that wasn't broken but also sought to perfect a car that everyone considers to be as close to perfection as is humanly possible: the BMW M5. Then he casually sent the result to us for review. He didn't even chaperone the thing — he simply dropped it off and told us to keep it as long as we needed.

Conversation around the Lake Erie Spring Water cooler here at Hogback Road was skeptical. Dinan told us that his S2-M5 package — it costs $35,848 — upped the M5's horsepower from 394 to 470 and torque from 368 to 419 pound-feet, and did so without resorting to a turbo or supercharger. A 76-hp gain on a naturally aspirated engine would be an impressive feat on an unstressed, undeveloped engine, but the M5's mill is anything but unstressed.

The M5 V-8 is one of the most impressive motors ever built for the street. It is packed with four cams with infinitely variable valve timing, 32 valves, an aluminum block, eight electronically controlled throttle bodies — one for each cylinder — and an 11.0:1 compression ratio, and it's assembled with a care that results in 394 horsepower from 4.9 liters. It freely revs to 7000 rpm and never feels flat-footed, no matter how low the rev counter.

BMW coupled the engine to a six-speed manual transmission and a buttoned-down, lively chassis. We've never met an M5 we didn't love. It's won every comparison test it's been entered in, and if its $73,624 base price could be trimmed to get below our mid-$60,000 threshold for the 10Best Cars competition, it'd be a shoe-in for an award.

So we figured anyone trying to outdo BMW's engineers would, well, screw up. Maybe the result would be faster, but the M5's overall package could well be spoiled in the quest for more speed.

Dinan approached the task differently when he started on the M5 project two years ago. First, he set out to increase the engine's breathing characteristics. He ditched the stock airboxes and airflow meters for larger, better-flowing units and installed shorter, larger-diameter velocity stacks. Next he bored out each of the throttle bodies.

On the exhaust side, he installed a set of Dinan-made headers that resemble a pile of cooked spaghetti but flow well enough to create another 28 horsepower. In addition, he added a new exhaust system that sounds slightly raspier and weighs 29 pounds less than the stock system. Finally, Dinan lightened the flywheel by seven pounds.

These hardware changes are only a small part of the engine modifications. The real challenge was to reprogram the engine computer to take full advantage of the improved breathing. The M5's computer controls a myriad of engine functions, including the throttles, the timing of all four camshafts, and the usual bits such as the pulse-width and timing of the fuel injection. Each of these functions relies on the other, so change one — timing, for example — and then you likely also have to change everything else.

Writing the optimal program was a long, arduous, and iterative process that Dinan says took the bulk of the two years his company spent developing this package. But hard work paid off with the added 76 horses at peak power and a fatter torque curve that offers more torque at every rpm.
Coupled to the more powerful engine is a shorter final drive (3.45:1 versus 2.81:1). There are also slightly stiffer springs and shocks, special forged aluminum wheels, wider tires, and cooling ducts that direct air to the stock front brakes.

We found the benefits of these changes after our first run on the test track. Dinan's car is a rocket. It rips to 60 mph in 4.1 seconds, to 100 in 10 seconds flat, and through the quarter-mile in 12.7 seconds at 113 mph. The last M5 we tested needed 4.7 seconds to reach 60 mph and turned the quarter in 13.2 seconds at 109 mph. The S2-M5's top-gear acceleration from 50 to 70 mph improved 0.2 second, to 6.2. Dinan says that in addition to raising the stock 7000-rpm rev limit to 7300 rpm, he also removed the 156-mph top-speed governor. We didn't test for top speed, but Dinan suggests the S2-M5 can reach redline in sixth gear, which would be a hair-raising 191 mph. Skidpad grip climbed from the stocker's 0.83 g figure to 0.87.

And we did not find a downside, or any quirky behavior, with the increased performance. The exhaust system delightfully burbles at idle and emits a satisfying rasp at full throttle, but it settles into a subdued hum when cruising. The engine's throttle response is big-block instant. Thanks to the wide gear spacing of the M5's transmission, the shorter final drive does not make for frenzied highway cruising. At 80 mph in sixth gear, the engine revs at about 3000 rpm. Similarly, the suspension changes didn't ruin the M5's balance. Although we didn't have a stock M5 around for direct comparison, Dinan's S2-M5 had the same impressive combination of resilient ride and well-controlled body motions, but with even more grip.
It's a thoughtfully engineered package that feels as though it could have come from the factory. There are even side benefits we didn't expect, such as easier clutch engagement. We never realized how tricky it is to get a stock M5 rolling smoothly until we got in the Dinan car. Dinan says the lightened flywheel gets the credit.

Should you too have to fear of Shakespeare's warning, you may have the S2-M5 system installed on your M5 at any one of the 100 Dinan-licensed BMW dealers. Dinan will match the remainder of BMW's four-year/50,000-mile warranty and will also match that warranty if the package is installed on a new car.
Dinan also offers systems for the BMW 540i that include a supercharger. We haven't had a chance to try out that one yet, but for sure we won't be second-guessing it.

Dinan, 865 Jarvis Drive, Morgan Hill, California 95037; 408- 779-8584; www.dinanbmw.com.
Vehicle type: front-engine, rear-wheel-drive, 5-passenger, 4-door sedan
Price as tested: $109,472 (base price: $109,472)
Engine type: DOHC 32-valve V-8, aluminum block and heads, Siemens MSS 52/Dinan engine-control system with port fuel injection
Displacement 302 cu in, 4941cc
Power (SAE net) 470 bhp @ 6900 rpm
Torque (SAE net) 419 lb-ft @ 5000 rpm
Transmission 6-speed manual
Wheelbase 111.4 in
Length 188.3 in
Curb weight 3995 lb
Zero to 60 mph 4.1 sec
Zero to 100 mph 10.0 sec
Zero to 130 mph 17.4 sec
Zero to 150 mph 25.1 sec
Street start, 5-60 mph 4.7 sec
Standing 1/4-mile 12.7 sec @ 113 mph
Top speed (mfr's est) 191 mph
Braking, 70-0 mph 163 ft
Roadholding, 300-ft-dia skidpad 0.87 g
EPA fuel economy, city driving 12 mpg
C/D-observed fuel economy 14 mpg

[foto_choppa]

if u typed that thatys fast!