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Old 05-02-2009, 10:02 PM
MTUpower MTUpower is offline
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Join Date: Jul 2004
Posts: 7,381
Remember folks- basics ----you need a top running stock engine and a quite good understanding of this engine and be mechanical and have tools, plus the space/time and/or money to alter your engine to obtain higher figures. A VGT turbo is the upper end- we'll all end up there ((if you continue to want more power (until you recognize that twins or super size is the power.)) Seeing that all of less than- what is it now?- ten people? 12 people? on the planet have a VGT on a 617-95X and publicly shown it, and of those 100% have done it themselves (and if there is a case where "you" paid a shop to install a VGT on your 617 what do you think the final bill was?) we all have to consider that this option is far down the line for most of us.
That brings us to this:
If you want more power out of your 617 you need a properly running stock engine and related components, proper additional gauges, and then remove (or try to alter on the engine) the Injection Pump (IP) and change the internal settings to deliver more fuel. You'll also need to change the stock boost settings on the turbo. Getting as much as 30 more HP with stock parts is pretty much the end of "stage one" it seems for the majority of w123/w126/w116 owners. When you get there moving onto a VGT is a much smaller, easier step.
To answer the question- get your engine running like new as best you can, add the gauges, up the boost and alter the IP internals, and add a intercooler if you can.
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