Quote:
Originally Posted by duxthe1
The 103 is a great engine but out of the box it isn't a great long term turbo foundation. I bought my first TE with the mosselman twin turbo kit (.5 bar)installed and the engine blown.  Teardown revealed numerous problems.... excessive rod bearing clearances, broken rings, deformed ring lands, damaged head gasket and head. The previous owner had spent 24K$ in repairs at our shop before selling me the car so it wasn't neglected to get in that shape.
If the 603 oil pump gear is installed it will not raise the peak oil pressure, just reach it sooner with more volume. The maximum pressure is controlled by the relief valve spring, which will remain the same regardless of how fast the pump spins. |
Neither Willy Mosselman or Turbotechnics was able to solve the AFR dilemma under boost.
Mosselman used a proprietary controller that still had detonation problems under boost.
Turbotechnics went in the correct direction with additional injectors but did not have the ability to control them effectively with their piggyback unit.
They both resorted to pulling timing.
In late 2006 when I purchased a NOS TT kit, I sought out the only individual who knows how to make power with the KE-Jetronic.
In fact Willy Mosselman is on record that this individual made his turbos go faster then he could ( Autoweek August 17, 1987 )
It took a great deal of collaboration to determine the best way to maintain the KE as stock but yet get optimum AFR under boost.
Took a lot of R&D, trial and error and hours on a dyno.
The end result is still working very strong after two years and making more power with every adjustment made on a dyno.
In fact I run about a 6 degree advance over stock.
To say the M103 isn't a long term turbo foundation based on a junk engine you purchased shows a lack of knowledge of how many twin turbo M103's are still in service.
Initial installs go back to 1986 and many of the TT"s are documented with close to 200K miles.
The engine doesn't need any more oil, or a larger throttle body or the EZL or KE control to be fiddled with, not even a change over to EFI.....it just needs to have a control that will assure an AFR of around 11.7 under boost..
I'm running 5 second 60's and low 13's-108 using a G-Tech 3 axis accelerometer....and the car passed state emissions with flying colors !!!
And it will go faster with my next project which is getting more power to the ground...running around 340HP / 390 torque at the crank....in essence I've so far doubled the published horsepower.