Quote:
Originally Posted by Jeremy5848
Here it is, folks:
1987 300D Turbo (W124)
Odometer 136,000 miles (probably more)
Biodiesel B100
Altitude ~200 feet
Trap ox recall performed about 1000 miles ago, turbo replaced too
Clean air and fuel filters
Speedo low by ~3% (57 MPH speedo = 60 MPH GPS)
Odometer low depending on how much it spends doing nothing -- this time 24%
Fuel economy using GPS as tripmeter: 20 MPG (279 miles, 14.0 gallons, B100)
With gentle footfeed, the car starts off from a dead stop feeling like it really wants to go but the promise is not kept and the acceleration eases off after the first few seconds. Full immediate footfeed gives "slug" performance. The same feeling of "nothing" occurs when the accelerator is floored with the car running at 60 MPH. Acceleration is almost non-existent; one must make an appointment long in advance to overtake another vehicle.
0-60 time (analog stopwatch, 1970s vintage)
Test 1 (gentle footfeed at first) 21.5 seconds
Test 2 (full footfeed immediately) 27.8 seconds
Test 3 (full footfeed immediately) 26.0 seconds
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I notice that you have already removed the ALDA and observed the same results.
Therefore, if the IP is providing the requisite fuel, the only other possibility for such poor performance is an exhaust restriction or a non-rotating turbo. But, with 11 psi of boost, the turbo is fine.
I think you've got to drop the downpipe and take it for a drive without the exhaust connected.