Tuner Tuesday Double Take: 2002 and 2003 BMW M5 Dinan S2s

There are a few select automotive tuners who can take an impressive package and refine it into an even better entity. That group includes legends such as AMG, Alpina and Ruf – all of which are staples of this segment.

Yet they are far from alone. Given the task of improving on what is generally considered to be one of the greatest sedans ever made is no small feat, but if there was one group up to it, it was Steve Dinan’s eponymous company in California.

While just about anyone can take a turbocharged engine and crank up the boost, slap a few stickers on it and call it done, the E39 M5 didn’t come with forced induction. On top of that, it was a motor which wasn’t exactly underdeveloped before it went into production. Nor were the brakes, suspension, or any other aspect of the third gen M5. But Dinan thought they could improve upon them, and with a tremendous amount of work, did.

Dinan went to town on the S62 from start to end. Out came the factory air boxes, air meters and velocity stacks, replaced by Dinan units of larger diameter and better flow qualities, along with larger throttle bodies bored out by the company. This necessitated reprogramming of the computer controls for the engine to match the new flow characteristics. To help the exhaust side of the motor, unique tubular headers were fit to a free-flowing, lightweight exhaust system. While this sounds a bit like old-school engineering, it was successful; the result was an additional 76 horsepower and 51 lb.ft of torque – basically, this was like adding a 1980 Rabbit’s worth of power to an already powerful car.

Dinan coupled the engine mods with a shorter final drive and higher rev-limiter to reach fantastic speeds. The S2 was capable of 0-60 runs around 4 seconds flat and, in unrestricted mode, geared out around 190 mph in 6th. These are still very impressive numbers today, some fifteen years after its introduction! Of course, special forged wheels from the company were added along with their signature suspension. The price was steep, at $36,000 in modifications alone – a further 50% premium on your premium sedan.

Today, you can pick up one of these super-saloons for less than what the price of the modifications cost originally making them one heck of a performance bargain, and I have two to consider for today’s Tuner Tuesday:

CLICK FOR DETAILS: 2002 BMW M5 Dinan S2 on eBay

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Double Take: 2001 and 2002 BMW M5 Dinan S2s

“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”, Car and Driver wrote in 2002. Dinan had, at that point, already made a reputation for themselves as the premier BMW tuner in the United States to the point where they became offered straight from the dealer. Considering that’s just occurred for Alpina here, the endorsement of the level of engineering from the California firm was resounding. Yet that is in part because Dinan’s modifications are far from just slapping a badge and some wheels on a car and calling it done. Take, for example the M5 S2.

Dinan took what many considered to be a very highly developed 4.9 liter V8 in the S62 and went old-school to up the power; and up it a lot, he did. There was no supercharger or turbocharging here; revised intake and enlarged velocity stacks were met on the other end with tubular headers and a bespoke exhaust. Each throttle body’s bore was increased, too. These changes required a reflash of the computer, but were both lighter and more powerful. As in 76 horsepower more. That’s the best part of a 20% gain on a motor that many considered to be close to peak performance! Dinan further upgraded the suspension, brakes, wheels, and final drive, along with adding a lighter flywheel. As a result, the new S2 was, well, about 20% better than the already awesome M5. But that perfection cost, and it was more than a 20% increase. A lot more.

On top of the M5’s $73,400, if you wanted a fully spec’d out S2 you’d tack on $36,000 to the price. For that amount, you could have grabbed a nice 330Ci in addition to your standard M5! But a select few did pony up the extra cash for their extra-special E39s, and today we have a rare occasion of seeing two for sale at the same time:

CLICK FOR DETAILS: 2001 BMW M5 Dinan S2 on eBay

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Tuner Tuesday: 1991 BMW 850i

Yesterday, Craig took a look at a very nice and quite affordable E32 750iL. These cars have traditionally been one of the most affordable ways to get into a V12 sedan, and consequently coming across a generally well sorted one that doesn’t require an extensive amount of service is difficult.

But the M70B50 also found its way into the replacement for aging E24. The revolutionary E31 signaled a leap forward in sophistication, refinement and styling from other period BMWs. Minus small details, it still looks reasonably fresh today; something that can’t be said of many 1980s-era designs. The three-quarter view above, for example, is mimicked closely by BMW’s own current 4-series today and the Audi A5. Yet as with the E32, the E31 has been the gateway into V12 Grand Tourers for many with aspirations loftier than their bank accounts. Finding a pristine, early 850i isn’t an everyday occurrence, so this one was certainly worth a look. It didn’t hurt that it’s been breathed on by Dinan, either.

CLICK FOR DETAILS: 1991 BMW 850i on eBay

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Tuner Tuesday: 1989 BMW 535i Dinan Turbo – REVISIT

Here at GCFSB, we feature a lot of cars. Since I started writing for this site, I’ve composed some 1,773 articles, a fair amount of which cover more than one car. So it would be easy to forget that you’d already seen a car. That would especially be the case if a fair amount of time had passed since you last saw it and it was a relatively plain-jane looking model.

Enter this 1989 535i in Cirrus Blue Metallic. Outside of Hartge wheels, it’s pretty unassuming. That is, except for the “Dinan” badge on the left side of the trunk.

It’s that Dinan badge which unlocks a world of performance that otherwise is the domain of M models, and this sleeper package with low reported miles seems to be a pretty compelling alternative. Immediately, I recognized this car but knew it had been a bit since I last saw it. Since it was originally featured in March of 2014, very little has changed – the seller utilized the same photos and much of the same description from the original ad, disappointingly. He reports about 500 more miles in two and a half years, and unsurprisingly the price has dropped little. The auction is no reserve with an $11,250 starting bid – only about $750 less than the original ask. As the market on E34s really hasn’t improved greatly since then outside of some exceptional M5s, I’d wager this automatic 535i – even with the Dinan provenance – will have trouble this time around, too.

CLICK FOR DETAILS: 1989 BMW 535i Dinan Turbo on eBay

The below post originally appeared on our site March 11, 2014:

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1995 BMW 540i Dinan

4The California-based tuning company Dinan has been providing performance upgrades for BMWs since 1979. There’s no shortage of newer cars on the market that purport to have some kind of mods from the firm; 20 cars come up in eBay right now under a search for Dinan, and Carter wrote up this neat ’08 550i M Sport Dinan the other day, for example. But it’s even more interesting to stumble upon an example of an older car with some Dinan components, like this ’95 540i.

CLICK FOR DETAILS: 1995 BMW 540i Dinan on Bimmerforums

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Tuner Tuesday: 2008 BMW 550i M-Sport Dinan 5

I still remember well when the new E60 5-series launched. I was not impressed. It looked modern, sure, but it also looked very heavy and it was full of odd angles. It was expensive, too, and though the M5 came with a massive screaming V10, the rest of the run seemed to be pretty tame. But BMW offered steady upgrades throughout production, and the post-LCI sedans really came into their own with the M-Sport package. A few weeks ago I posted a ’08 550i M-Sport 6-speed on our Facebook page, and its popularity proved that more people are beginning to appreciate the performance value offered in this unique package. Having spent the past half year with a E61 Sport, they are really fantastic cars to drive and ooze quality and you can count me among the converted. Today I have another 550i M-Sport 6-speed, but this one has been turned up a few notches by Dinan:

CLICK FOR DETAILS: 2008 BMW 550i M-Sport on eBay

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Tuner Tuesday: 2006 BMW M5 Dinan 5.8

Nate’s look at the E34 and E39 Dinan M5s over the past week is a poignant reminder of the factory-backed performance available in these super sedans. In the best style of “Q-Ships” – World War II merchant ships that hid surprising armament behind their docile exterior – they’re turned up but never outrageous. When it came to the E60 chassis though, with 500 horsepower on tap how did one increase the already world-beating performance? In Dinan’s case, there was no replacement for displacement, as they punched out the 5 liter V10 to 5.8 liters. The result was an additional 100 horsepower and around 80 lb.ft more torque while still maintaining the stratospheric redline. Yet that insane performance was available in a wrapper which looked no different than a standard M5:

CLICK FOR DETAILS: 2006 BMW M5 Dinan 5.8 on eBay

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1991 BMW M5 Dinan 3.9 – Revisit


The E34 M5 may be the least-loved of the breed, but who is going to argue with a 3.9 liter stroker S38? I adore my S38B35, and the thought of a torquier, gnarlier Dinanified inline-6 with an extra pint of volume makes me tingle. This Calypso Red M5 has made the rounds, first selling on BaT in 2012 for a relative pittance before spending the last year-plus trying to spin a profit. The speculative seller has repainted it but accrued fewer than 1k miles, making clear his intentions to cash in on a rare, tuned M-car. The reality that E34s aren’t appreciating like E30s or E38s has apparently begun to set in, as he’s asking now asking $6,500 less than in 11/2014. If you’re looking for a monster E34, this is probably the way to go. But when you could be getting an E39 with 60 more horsepower and a generation newer everything, does anyone like the E34 enough to pay the premium? I’m guessing the seller is going to have to have more patience or less pride before this M5 can start spinning its wheels again with a real driver.

-NR

CLICK FOR DETAILS: 1991 BMW M5 on eBay

The below post originally appeared on our site November 28, 2014:

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Feature Listing: 1999 BMW M Roadster with AC Schnitzer and Dinan Modifications

With all the hoopla surrounding the BMW M Coupe, it’s easy to forget about its sibling, the M Roadster. This wide-hipped roadster offers a lot of power in a very small package along with the ability to drop the top and listen to the noise of that straight six out the quad tailpipes. This Estoril Blue M Roadster is for sale from former GCFSB contributor Aaron Kraljev in Portland, Oregon. This M Roadster was his personal car and has been meticulously maintained. It also comes with a host of nice options and accessories, such as the hardtop, AC Schnitzer alloys and exhaust along with Dinan performance software. Looking to stand out a bit with your M Roadster? Read further…

Click for details: 1999 BMW M Roadster on Craigslist Portland

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Tuned BMW E60 M5s

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You might think that a car that has a simple button to raise its power by 100 horses might have enough, but today we have two E60 M5s that will explain to you why that kind of thinking makes you a peacenik ninny. I mean, if you can get a V10 in used Audis, then you have to do something to make your M5 stick out, right? These two E60s take pretty different approaches to power and style – supercharger vs. stroker, manual vs. SMG, Eurotuner vs. Roundel – but both represent about as insane of Autobahn stormers as you can find.

Click for details: 2008 BMW M5 on eBay

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