So, this may be just something stupid.. and ill probably get flamed for it.. but I've been tracking down my severe lack of performace.. it was running like ass, getting terrible mileage, no power, and random MILs. I ended up replacing the engine harness and that cured the running like ass, getting terrible mileage, and the random MILs, but only helped the lack of performance. Don't get me wrong it is a helluva lot faster than with the old harness, but it still was faster all stock.
The car has a rebuilt engine with good compression, 3 inch turbo back exhaust, DM intercooler, and 57 trim CT26. And that last point is where my likely stupid question lies. With both of my factory CTs, you could clearly hear the turbo spool. Even with a factory intake and exhaust. Even more so with 3 inch turbo back and an apexi dryflow air filter. Now that I've switched to the 57 trim, there is absolutely zero turbo whistle. It also doesn't fully spool until around 3500 rpm. I was under the impression that 57s were supposed to spool around 2500-2700. I also noticed when I first got the turbo, that when you gave the impeller a good spin, that it would only rotate around 2 or 3 times, whereas my stock CT would rotate around 7-10 times or so.
It also seems like it pulls harder at 3/4 throttle rather than full throttle. But that may be me just being crazy.
I've tried searching this issue and only came up with a bunch of guys with stock diesel trucks wondering why their Turbos weren't whistling.
Any input on this would be much appreciated.. Maybe a oil coked bearing? Just too tight of clearances?
Sent from my HTC Droid DNA
The car has a rebuilt engine with good compression, 3 inch turbo back exhaust, DM intercooler, and 57 trim CT26. And that last point is where my likely stupid question lies. With both of my factory CTs, you could clearly hear the turbo spool. Even with a factory intake and exhaust. Even more so with 3 inch turbo back and an apexi dryflow air filter. Now that I've switched to the 57 trim, there is absolutely zero turbo whistle. It also doesn't fully spool until around 3500 rpm. I was under the impression that 57s were supposed to spool around 2500-2700. I also noticed when I first got the turbo, that when you gave the impeller a good spin, that it would only rotate around 2 or 3 times, whereas my stock CT would rotate around 7-10 times or so.
It also seems like it pulls harder at 3/4 throttle rather than full throttle. But that may be me just being crazy.
I've tried searching this issue and only came up with a bunch of guys with stock diesel trucks wondering why their Turbos weren't whistling.
Any input on this would be much appreciated.. Maybe a oil coked bearing? Just too tight of clearances?
Sent from my HTC Droid DNA
