Quote:
Originally Posted by Mike930
|
Wow -- that is really strange.
...Wastegate locked fully open, bypassing as much exhaust gas as possible...
...plus, wastegate spaced an additional 4mm off of the headers to bleed off more exhaust flow...
...and still making 0.85bar.
You effectively have no wastegate in the system, just an open pipe bleeding off exhaust gas (energy), and there is still enough going through the turbocharger to make 0.85bar boost.
The turbocharger's turbine wheel is comparable to a GT35R's, and a 35R's exhaust flow is adequate, as well as the 0.82A/R turbine housing.
If there was too much backpressure, ex: restrictive cat/muffler, or turbine, then you should not be making boost.
Conversely, if the turbine is the path of least resistance (minimal backpressure) and all the exhaust wants to flow through it and not the wastegate circuit, then you'll be making too much boost.
Question: is there anything new about this turbo system, something you have recently changed?
Or is it all parts you have used with success for a while, and this is suddenly a new problem?