k14 turbo upgrade ?

[badersbus]

Hey guys.
As seen in another thread , in the process of having the 1.6 td engine rebuilt. While everything is stripped it looks like the turbo needs a bit of attention. Its a K14 and was wondering if any  gains could be made by junking this turbo and finding another type while it is all down and having that one refurbed. Looking for a more than the standard 1.6 performance , but nothing too crazy. What would you guys say?. Also what about the IP ?. This is gonna be a daily so need reliability as well
Cheers Kirk

[badersbus]

Thanks for that libby... Looking for quicker acceleration rather than top end really , so a quick spool up i would think not keen on a lot of lag. Car will probably never get above 70 mph .  Like i said nothing too radical just something to give a little kick to shock those boy racers fellas lol
Kirk

[duff]

hey i am in the same boat, i have a 1.6 TD out of a 84 jetta that i am rebuilding and i was looking to give it a little more pop but i am looking for more power on the top end when im on the highway. so it seems that the k24 and T3 turbo is more what im looking for i was just wondering if it was a stright bolt on or will i have to make some modifications. also i am new to working with turbos what do you mean by more lag?

[flapjack]

More lag means the turbo won't give you as much pressure at low rpm.  Light turns green, you floor it and you feel like you're driving a diesel with no turbo. The bigger turbo will make you wait till the motor rpm rises to a point where the exhaust gases have enough force to spin it.

[duff]

how much will the bigger T3 turbo hurt fuel economy compared to the orignal turbo? also how much more power will it give me?

[duff]

sorry what do you mean by over-fueled when boost is off? im looking at two differnet turbos right now one is a stock one that is just rebuilt the other is a T3 that has an adjustable waste gate so you can add more or less boost which one would you go with?

[flapjack]

Here is a discussion about turbo choice:
http://vwdiesel.net/phpBB/viewtopic.php?t=10264

In case you haven't, read this:
how to get more power from your 1.6TD
http://vwdiesel.net/phpBB/viewtopic.php?t=645

http://vwdiesel.net/phpBB/viewtopic.php?t=1352

[gldgti]

It won't hurt fuel economy unless you are over-fueled when off-boost.  It will not give you any additional power unless you increase boost to above 18 psi.  It will cause you to have less power in the lower RPMs and give no benefit what-so-ever when running stock boost levels.

Andrew

thats not entirely true...

a larger turbocharger will have a different efficiency plot when compared to smaller turbo's and therefore may deliver lower inlet temperatures at similar boost levels when compared to a small turbo.

when a turbocharger compresses the inlet air it heats up - but the efficiency of turbochargers varies with three variables - the pressure ratio Pout/Pin, the rpm of the turbocharger, and the volumetric flow rate required.

when a turbocharger is operating efficiently, it will (EFFECTIVELY) deliver less inlet temperature rise for a given volumetric flow rate and pressure ratio. the rpm is a mechanical requirement of the turbocharger to do said work.

the short of this is that its possible for a larger turbocharger to operate more efficientl under certain conditions, and thus deliver lower inlet temps, and lower EGT's for your engine.

[gldgti]

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[gldgti]

well then thats different - and now i know for myself - i've been tossing up putting in a different turbo for my aaz.....