09-02-2013, 08:14 PM
(09-02-2013, 05:47 PM)TY-HDI Wrote: Ruan the hdi really doesn't have power past 4.5k so that's no issue then?
Nice torque figure, shame on the BHP.
Although the place you all went for the dyno day seems quite shit so the figure probably don't mean alot. Does it still pull well?
Turbocharged Diesels really don't suffer from any of the issues that petrols do with exhausts.
Backpressure is purely there at lower RPMs to keep the mixture in the cylinders where the air inertia isn't high enough to take advantage of the valve overlap and thus is just throwing a large quantity out the exhaust valve. Diesels don't really have this issue, since they're normally turbocharged so the cam profile is such that they don't have much valve overlap and they have a turbocharger on the exhaust side which produces quite a bit of backpressure normally...
Most people have this whole thing that "no backpressure = no power" which isn't true, it'll feel like it has less low down torque, however.
