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Supercharging-Turbocharging Questions (Long) (archive)

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Posted by Lester on October 04, 1998 at 12:41:47:

I have been looking to add more power to the ///M Roadster that I have on order. Can someone help me with the following questions about turbocharging and supercharging?

1. The ///M Roadster has a large engine in a small space. This causes increased heat in the engine bay. That is why BMW redesigned the front end and took off the fog lights, to allow more airflow into the engine bay. It seems to me that more horsepower may mean more heat under the hood. Does anyone know if the motor runs hotter when connected to a turbocharger or supercharger? Is this a problem? If it runs hotter, what modifications should I make to the type of oil used in the motor?

2. Most turbocharger or supercharger changes also include a new computer chip and larger fuel injectors. What is the effect of these after market changes on the scheduled maintenance I'm suppose to received from my local BMW dealer?

3. What is the effect of adding an after market turbocharger or supercharger on the new car warranties from BMW? One maker of a turbocharger and supercharger posted a web sight note that indicated that it does not void your warranty. I would rather avoid the legal arguments with my dealer and BMW. What I'm looking for is this, how has BMW actually treated a warranty problem with major after market modifications to their motor?

4. Dose anyone have any thoughts on whether a turbocharger or a supercharger would work best in an ///M Roadster? A recommendation on the brand would also be helpful?

5. Should I wait until the motor has a few miles on it before I install a turbocharger or a supercharger? By this I mean, should I wait until after the break-in period is over or until I have about 10,000 miles on a well broke-in motor? I should note that my Nissan 300z turbo came with the car, and I have had no problems with it in a little under 100,000 miles.

6. I note that Dinan sells a Supercharger System for $6,995.00, says it takes about 21 hours to install, and makes 338 horses with 281 ft/lbs. of torque. Dinan also offers a Supplemental Warranty for $2,500.00. Turner Motersports sells a Supercharger System for $5,995.00, says it takes 7 hours to install, and makes 356 horses with 302 ft/lbs. of torque. Does anyone have any experience with either one of these systems and do you have any recommendations? Why is a Supplemental Warranty needed anyway?

I'm sorry if this post got a bit long, but I thought that before I make another major investment that I would come to the experts for some advice.

Lester, with a Boston Green/Black/Black ///M Roadster on order.




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