WHY? because it will cost in excess of R14k to recon the original KZ pump. Got quotes from various places and even considered removing the pump myself to reduce the labour cost.
The big "advantage" of the electronic 1kz pump over a manual one is timing adjust. The ecu using the inputs from the intake air temp, crank angle, fuel temp, manifold actual pressure (MAP) sensors and throttle position sensor, dynamically adjusts the timing. Retarding it and advancing it. This gives better economy or more power when you need it. BUT since toyota is know for their conservativeness the real world gains over a full on manual pump is minimal. You need a piggy back chip and a proper tuner to fully harness the electronic goodness. BUT this is only works if your pump is in tip top shape. After 312k km mine isn't anymore... So asking a tuner to up the performance is a bit of a waste.
Since I have a front mount cirrus intercooler I did end up fitting a chip round 285k km. It made a difference, the power was more but at 92.5kw and 333N/m. I won't exactly call it a rocket. But it goes well and egt's stay under 680 deg C. At 300k km I fitted new injector tips too. Made the economy a bit better.
The big deciding factor however was fuel economy. My economy was in a slow and steady downward decline. When I bought my KZ at 228k km it was in a terrible state, but it did at least run in the 8.7 - 9.2 km/l zone. Now on 312k km the last tank gave me 7.56km/l. My Fuelio log and chart shows a steady downward decline over 74 fillups and records from Sept 2014. Didn't keep record before that
So it was time to act. My fuelio log also tells me that since sept 2014 I have spent more than R50k just on fuel alone... So there is substantial savings to be had.So after a lot a research:
http://forum.ih8mud.com/threads/1kz-t-n ... ap.536516/" onclick="window.open(this.href);return false;
http://www.biopowered.co.uk/wiki/Mitsub ... uel_system" onclick="window.open(this.href);return false;
http://gnarlodious.com/Vanagon/Bosch_Pump/-Rebuild" onclick="window.open(this.href);return false;
http://www.pajeroclub.co.za/forum/viewtopic.php?t=1399" onclick="window.open(this.href);return false;
http://forum.ih8mud.com/threads/77-fj40 ... 496/page-3" onclick="window.open(this.href);return false;
http://toyotasurf.asn.au/forum/viewtopic.php?t=32099" onclick="window.open(this.href);return false;
http://www.offroadexpress.kiwi/Forums/v ... 46&t=28231" onclick="window.open(this.href);return false;
http://www.landcruiserclub.net/forums/s ... -4m40-pump" onclick="window.open(this.href);return false;
I sourced a completely rebuilt colt pump with a new housing and all for about R5k.
Here is George's thread: viewtopic.php?f=3&t=34941&hilit=horses+back#p417461" onclick="window.open(this.href);return false;
One of the cons of fitting a manual pump like this is killing your engine. It now becomes very easy to add more fuel and get sky high EGTs. Thus it makes sense to have a very comprehensive monitoring system. Like a madman or my own Arduino based system:
viewtopic.php?f=41&t=40776" onclick="window.open(this.href);return false;
I will update the thread as soon as I drop the vehicle off and get it back. It will be going for a dyno too.
but I doubt its gotten heavier over the course of time 
this should translate to better fuel economy too. 
