I don't suppose the turbo bearing is stuck a bit?
Pull the inlet hose off and make sure the impeller is free to turn.
CharlesY
turbo engines sound quieter due to the absorbed pulse science thingy, hence can run with less silencers in the way, a decent bore and single back box will be fine, less back pressure should help the turbo spin up quicker as well i think
CharlesYTurbo checked, and spins nice and smoothly. I did notice a bit of play I'm guessing about a 64th of an inch.
That's about right then. The turbine and impeller are one on each end of a skinny shaft, which runs inside a plain bearing which floats loosely in the turbo casing. As long as there's a plentiful flow of oil, all will be well.
What kind of fueling anomaly did you have in mind CharlesY - go on , give me a clue
I suspect "not enough" to match the extra air - yet.
I have to admit the truck is running soooo much better without an exhaust
I have ordered the middle section - but boy is she loud with the throttle open
Certainly feel I'm making some sort of progress.
To update.
I'm certain my valves need some adjustment, but I'm not sure how that would interact with the exhaust - if you know what I mean.
Your valves have TWO adjustments, clearance and TIMING.
Let's hope YOU set the clearances properly, and that someone else set the camshaft belt timing perfectly. Who fitted the belt last?
CharlesY - what checks should I be making with the fuel end of things?
Maximum fuel delivery setting of course as this does limit the maximum POWER no matter what else you do, but unless this has been "touched" it is unlikely to have moved. That really only leaves you with the usual suspects of fuel filters, air leaks, the turbo boost diaphragm being a bit sticky, and the ultimate question - perfect injection pump TIMING set for THAT engine by patient trial and error.
CharlesY
I would suggest that instead of "you could fit any backbox from any car in theory" should be "you could fit any backbox from any car of the same engine capacity and rev range" - it needs to be able to take the volume of exaust gases generated.
Hmmm, why does a TD5 backbox on a straight through system attached to a 3.5 V8 sound and perform better than anything else![]()
its a V8, it would sound perfect with anything attached to it![]()
That depends upon the configuration of the crankshaft.
It can be a "single plane shaft" which makes lovely V8 burbles or
a "Two plane" shaft which just sounds like a straight 4 going twice as fast.
Bet you didn't know that!
CharlesY
eek your right i dodn't know that, i assume its the old rover v8 which is a single plane i think!!! dont shot me if i'm wrong its a 50 50 chance