Iteresting read on DaimlerChrysler Product Development

[pauldun170]

http://www.thetruthaboutcars.com/the...t-development/

[The following is another contribution from our anonymous ChryCo contact] I worked for Chrysler for many years in Product Development as a Design Engineer though I no longer do. I saw comments on a recent post by another employee asking why, when Chrysler merged with Daimler, did they still share platforms with Mitsubishi?

There was always such hope in the platform sharing at the start of every project (JS – Sebring (Mitsubishi), PM – Caliber (Mitsubishi), WK – Grand Cherokee / WD – Durango (Daimler). By sharing the same platform we were supposed to achieve economies of scale, reducing the overall initial investment and engineering effort. Ultimately, those savings vanished during the development of the platform.

In truth, inter-company platform sharing—whether with Mistubishi or Daimler—created a power struggle, as the platform’s respective “owners” struggled to adapt their respective vehicle’s suitability to their local market. The inevitable end result: compromised design AND marginal cost savings.

The Caliber / Sebring are too narrow for the U.S. market (Japanese market cars are more narrow), the Caliber’s suspension system has too much drive shaft angle due to Mitsubishi inherited design optimized for their engines (allowing torque steer). I didn’t work on that platform. But I believe that Mitsubishi dropped out of co-development early after the decision was made to share, resulting in less savings. But I know for a fact that the cost savings initially planned were not fully realized.

I did, however, work on the new Grand Cherokee.

This product was co-developed with Mercedes alongside their next generation ML and GL vehicles. From Chrysler’s perspective this platform made a lot of sense. New crash regulations meant the current Jeep platform would have needed substantial upgrades to be viable. The new Mercedes platform also addressed other issues with the current Grand Cherokee platform: small rear door openings, uncomfortable rear seats, limited wheel size, larger engine box for future emissions/crash.

Mercedes wanted to spread their development costs over Chrysler’s volume to lower piece prices. Internally, we knew that Mercedes gained more than Chrysler from this co-development deal. Our costs were higher than if we had clean sheeted it from the beginning.

What initially started off with many common areas (brakes, suspension etc), eventually resulted in a few common parts and only some savings. The future Grand Cherokee has a small glovebox due to the straight crosscar beam Mercedes engineers use to enhance their vehicle’s crash/stiffness. The cross car beam was eventually cast in magnesium by Chrysler vs steel by Mercedes due to divergence of design goals. Steel is good for strength for side crash or anti-vibration stiffness for improved steering column shake, while cast magnesium normally results in great packaging (big glovebox), costs more, and is lighter. Because the airbag had already been packaged and it couldn’t be moved (its location affects crash performance), the glove box size for the Jeep was already compromised by the initial design.

Mercedes’ focus was their uncompromising design objectives. Chrysler’s was usually cost or off road performance. Mercedes would rarely yield to Chrysler desires for cost savings, and the two teams would go their separate ways. Mercedes wanted a saddle design fuel tank (one tank shaped like a saddle with two fuel pumps at the lowest points) for a large fuel capacity, and for packaging for dual exhaust on the six cylinder. Chrysler wanted a single fuel tank for cost savings, but with a smaller capacity and only one pump. Divergence.

Mercedes is willing to package a mini-spare on their vehicle. Chrysler requires a full size spare as optional for SUV’s. Result: divergence in the rear end of the vehicle. A common floorpan stamping suffered a similar fate. The stampings were supposed to be the same part number (i.e. identical). But differences in small holes or studs in the body for mounting things (e.g. electrical components) quickly separated these parts.

The overarching problem: there was never alignment between the philosophies of the teams developing the vehicle. Mirror that on the Daimler acquisition of Chrysler. Technology transfer could only occur from Mercedes to Chrysler. They could donate their high cost platform to Chrysler with impunity but if they jointly developed a program, they risked their lineage. Who wants a Mercedes designed by Chrysler?

Chrysler on the other hand had to significantly redesign / retool a Mercedes platform to lower cost. On the surface the merger made sense but in reality, the two weren’t reconcilable. Ipso facto.

[goof2]

It shouldn't come as a big surprise that difficulties arose using the same chassis in a $30k Jeep (base Grand Cherokee) and a $90k Mercedes (base ML63).

[101lifts2]

This only goes to show that rebadging makes sense...as to why GM does it so well. lol