[Vwdiesel] smaller (k14-ECOdiesel) vs. larger (is it k24? normal 1.6td)

[Gary Shea]

Cool!  I had guessed that the K14 would be a better solution for
non-full-throttle driving, but never would have guessed that the K14
would be able to make the same boost (at lower rpm's!) that the larger
turbo's BOV is set to... that's pitiful!

Incidentally, the '84 Quantum 1.6TD that I have came with a Garrett
T0304 (a subspecies of T3).

I put the Garrett back together last night.  Got a rebuild kit and had
the wheel & shaft+wheel parts balanced at a local (SLC) shop, High Tech
Turbo.  Not too painful.  I got lucky and caught the rebuild kit on sale
for $50, so the total was under $100.

    Gary

On Fri, 2005-07-22 at 15:41 -0400, Libbybapa at wmconnect.com wrote:
> I thought that some of you might be interested in my thoughts and experiences 
> regarding these two turbos on the 1.6TD.  The engine that I put into my 
> vangon was originally an ECOdiesel which had the smaller k14.  When I installed it 
> into my van I added a Saab 9000 intercooler.  I added the aneroid equipped 
> pump and line and ran the van that way for a while.  Then many may recall my 
> wierd oil pressure issues (boost up oil=oil pressure down and vice versa).  While 
> working on that I dismantled the k14.  While still attempting to solve the oil 
> pressure issue I got another complete 1.6TD engine.  It had the larger turbo. 
>  I swapped that turbo onto my van (with no effect to the oil pressure 
> situation).  With either turbo I would run 11-12psi.  Above 12 the BOV goes off.  
> Anyone know of an adjustable BOV that will fit the jetta manifold?
> 
> Here is what I have found.  I really need to install my tach so I can talk 
> rpms but here goes anyway.  The larger turbo requires higher rpm's and more 
> fuel/pedal in order to produce the same amount of boost/power.  The EGT's are also 
> HIGHER with the larger turbo.  My only explanation is that more fuel is 
> dumped for a given boost pressure and so the ex-gas is hotter.  I have heard from 
> others that the smaller k14 will easily produce 15 psi throughout the entire 
> rpm range of the 1.6TD.  The biggest performance difference is when accelerating 
> up hills.  If shifting at 4,000-4,500 the k14 will still produce max boost in 
> the next gear.  The larger turbo will max at 5psi until the rpm's in the next 
> gear increase significantly.  
> 
> Summing up my conclusions: the smaller k14 turbo is better suited to the 
> 1.6TD than the larger one.
> Max boost at lower rpm's.
> Lower EGT's.
> Less requirement for mashing the pedal/potentially better fuel economy.
> 
> 
> Andrew
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