EFI vs CIS - Page 2 - PeachParts Mercedes-Benz Forum

tjts1 · #1 10-12-2009, 07:00 PM

Quote:

Originally Posted by Mike D

Because it worked!

So did LH and Motronic with better fuel economy, lower emissions and more power. Mercedes was being lazy with its 90s Kjet cars. The late CIS cars with both electronic and mechanical injection components are diabolical to diagnose and maintain. All EFI cars have 1 fuel pump and 1 pressure regulator. Thats the extent of the mechanical side. The electronic components either work or they don't work. They are not subject to mechanical wear and adjustment. Fuel injectors, sensors, FPRs and pumps are all standardized and interchangeable with cars from a dozen different manufacturers that also used Bosch as a supplier. I've seen plenty of nice Benzes go to the JY in California because they failed emissions and from a Kjet fault. People generally prefer what they're familiar with but selling cars in 1993 with mechanical fuel injection is pathetic. Bosch EFI technology had gone through many generations and was very mature by the mid 80s. The 16 valve 190e could have been a truly great car with EFI, on par with the E30 M3. There is no excuse.

400Eric · #2 10-15-2009, 01:36 AM

Quote:

Originally Posted by tjts1

So did LH and Motronic with better fuel economy, lower emissions and more power. Mercedes was being lazy with its 90s Kjet cars. The late CIS cars with both electronic and mechanical injection components are diabolical to diagnose and maintain. All EFI cars have 1 fuel pump and 1 pressure regulator. Thats the extent of the mechanical side. The electronic components either work or they don't work. They are not subject to mechanical wear and adjustment. Fuel injectors, sensors, FPRs and pumps are all standardized and interchangeable with cars from a dozen different manufacturers that also used Bosch as a supplier. I've seen plenty of nice Benzes go to the JY in California because they failed emissions and from a Kjet fault. People generally prefer what they're familiar with but selling cars in 1993 with mechanical fuel injection is pathetic. Bosch EFI technology had gone through many generations and was very mature by the mid 80s. The 16 valve 190e could have been a truly great car with EFI, on par with the E30 M3. There is no excuse.

X2! And I should know. I have a 88 300E and a 89 300E as well as a 93 400E. While I love my M-103s, it is true that MB had no business holding on to that system as long as they did. Squirting fuel at a closed intake valve 75% of the time is not the recipe for good emissions, fuel economy, or performance! My LH equipped 93 400E offers up the same fuel economy according to Car & Driver's tests and my own tests, and better fuel economy according to the EPA despite having 98 more horsepower, 107 more ft. pounds of torque, and more than 25% greater displacement. Yes, there are other factors at play here but as far as I'm concerned, it's all win and no lose for the LH when compared to CIS! Anybody disagrees with me can buy my 2 M-103 cars so you can love them even more than I do!
Regards, Eric

babymog · #3 10-12-2009, 10:09 PM

There was a really sweet Shadow Can-Am car at the Elkhart Lake vintage races last year with the entire fuel-injection system hidden under the intake horns etc. to look stock, really nice job. Your photos remind me of that car, looks like a fun project.