Herbert Lettner - VW Golf IV TDI Kit-Car - OMV Rallye Aspang.
REVOTechnik VW Golf Sportwagen TDI Stage 1 - (Track) One Take
RevoTechnik tuner of all things Turbocharged, invited The Smoking Tire out to the beautiful Summit Point Raceway in West Virginia to test a few of their cars.
You don't agree with the idea of up shifting early, and yet you're a gear
higher than the petrol? :/
Also, look at the dyno graph, and you'll see that revving it out is an
absolute waste of revs, speed, and time.
+TheSmokingTire Matt, after looking at the power curve of this tune, I really am going to stand firm on this - as from 4,300rpm the power drops like a cliff. You'd be pushing to redline for no reason, and slowing your progress. If you get the car again, do a 1/4 mile time shifting at 4,500 and again at 5,000 - you will see an advantage. The amount of torque and power you lose in those last few revs is massive, this isn't a gas car, the drop off isn't progressive so there isn't a reason to whip a dead horse. While up shifting earlier places you back in the meat of things and gets you progressing faster.
+BigCarKilla I'm a gear higher than the gas car, yes, but I still don't like upshifting before redline when I'm on the straightaway. The car doesn't pull as hard above 4500 as it does below it, but the last 500 RPM are still worth using if you're trying to go as fast as possible. The time and momentum lost with two extra shifts isn't worth it to me when there are still revs left in the gear.
The problem with going into redline with a diesel is that it has zero
torque after 4200 RPM.
You can actually hear when you reach that point, as the engine stops going
"VRRRROOOOOO" and starts going "MOOOOOO".
It's because of the diesel being auto-ignition. The combustion can only be
sustained as long as the piston doesn't exceed a certain speed.
Shift it at 4500 or sooner, a diesel is not a gasser.
+Gordon Freeman Hasn't been the case in a lot of diesels for quite a long time. BMW, Merc, VW/etc all learned ages ago how to make diesels rev right upto where the fuel stops burning. Usually 5000-5200 is the new cut off and that's because they build soft limiters into the software to save engine damage after that. Look up piezo injectors in a common rail and you'll see just how flexible the new fuel delivery systems are.
+Gordon Freeman I generally agree with you. :)Although something to note it depends entirely on the given car/engine/hardware/tune.My car makes peak BHP at 4200rpm and holds it flat till 5000 :-) (same base Common rail VW engine as this)
They should be offering one with AWD and a 0.9 inch increase in ride height next year. It'll be called the Golf Sportwagen Alltrak. But, unfortunately for now no TDI engine and no manual transmission. Just the 1.8T and a DSG will be offered.
+Sean Hallissey I've been out there a few times for drifting events. It's a pretty nice drive out there from NOVA. I'm not really into drifting but I gotta say that Hyperfest is a lot of fun. They have other racing events too. I definitely recommend getting out there some time.