Saturday, Aug 09, 2003 at 14:34
A few more points
Comparing 2 TD in-line engines that are very close to same capacity in cc's but one is 4 cyl & 1 is 6 cyl
*Both can be close in performance with a bit of tweaking but cost bucks$$.
*Both run about the same RPM
*Both are 4 stoke Engines
BUT
4 cylinder engines for the same capacity/performance are subject to:
** Increased Stress & load on components. Given there a less moving parts there are less to share the same load.
remember increased stresses when Extended towing
**Run rougher when worn.
Indexing:
for In-Line 4 cylinder crankshaft are set at 180 Deg (2 pulse per revolution)
for in-line 6 cylinder crankshaft are set at 120 Deg (3 pulse per revolution)
** The dynamic difference in load distribution along the crankshaft will always make a 6 cylinder a smoother unit.
(that is why Jaguar made V12's)...ultimate is a radial engine.
Balancing of a new engine is via design and is achieved these days with excellent technology .
This may be text book but time & experience will give the final answer.
It would be interesting to note what professional truck drivers and fleet owners think of giant 4 cylinder engines in their rigs.
-Rapid Unit-
My Fuel calcs were from full tank to full tank & measuring the KMs travelled.
I am only doing about 150 KM a month with domestic use. 75% of my use is in 5th gear the rest up & down and on flat roads. I have started another
test last week so I'll give you a buzz with the outcome.
The Rapid Unit actually is a module that interacts with the fuel pump control and increases the injection rate relative to pedal demand, there is a direct increase in exhaust gas temperature offering a kenetic energy boost to the turbine expander picking up revs which immediately boosts air pressure hence available added power on demand.
The maximum permissible operating temperature allowed (including a safety margin) for the valves & valve seats in the 2.8TD is the performance limitations/set point for the Turbo Charger via the Rapid unit whilst in 4th gear on Dyno under load. This is where the % gain is limited.
If you drive conservatively the new efficiency can to be to advantage in fuel savings, but if you give it a bit of stick, she jumps up & roars and you get performance & use fuel you may not want to.
There is a switch to put it of & on and it is much more pleasant to drive with on.
When towing the van on highways only a few have need to pass me, steep mountains are always different .
Off-road more than ample torque for all situations and towing.
Get out there and use it.
Life is too short not to.
All the best...
Donald
AnswerID:
27261
Follow Up By: Patrol22 (Queanbeyan - Saturday, Aug 09, 2003 at 14:56
Saturday, Aug 09, 2003 at 14:56
Hi donald
I too have a GU2.8tdi and am very happy with it to date. OK it can be a bit of a slug off the mark but I haven't not been able to go where the rest of my 4WD club (Discos, Defenders, Cruisers, Prados, Patrols - with all sort of engine combinations) go. I am however interested in improving performance and fuel consumption and would like a bit more info on the Rapid - can you point me in the direction of who distributes/fits these things?
Thanks
Pete
FollowupID:
18737
Follow Up By: ramp - Saturday, Aug 09, 2003 at 17:08
Saturday, Aug 09, 2003 at 17:08
sorry for butting in on you donald but im at work and a bit bored so ill answer patrol22 question.turbo glide at
wollongong (russel vale) do them the phone is 02 4284-7881.next week i hope to have one installed,but rather than on or off im going to get a off,10%,30% increase therefore 10%for normal driving and 30% for towing the camper trailer or as extra grunt is needed price is about $1200. cheers
FollowupID:
18744