put my new inj. pump in

[chrissev]

vwdieselparts advertises reman injection pump for $650 US.

No, that is not the price.  They cost $395 for a rebuilt non turbo or $495 for a rebuilt turbo.  Shipped to Canada including tax and the exchange rate, it is $650.  

By the way... I would not recommend buying any reman diesel parts from vwdieselparts.  The place they outsource their diesel injection work to does crappy work.  A while ago, I got a set of rebuilt injectors through them, and when they arrived the injectors came inside plastic baggies with flecking-off paint inside the bags.

hmmm, reman injectors I got from them were Bosch remans, in boxes, from Bosch.  155bar with the rubber thing around the injector.  
 

Also, getting an injection pump "rebuilt" will not restore it to new condition.  Rebuilding a used but working pump consists generally of only the installation of an o-ring and seal kit like this one (http://home.comcast.net/~vwgtd/ve_mainkit.jpg), followed by the recalibration of the pump's timing and injection quantity adjustments on a test bench.  The rotory pump and high pressure sections, which can show wear with high miles, are generally re-used, (unless you pay a lot more to have them replaced.)

hmm, well if you're ever in southern Ontario I'll have to take you for a ride in my Jetta.  I wish I could have taken you for a ride before I put the rebuilt pump in, and then after, so you could have seen the difference.

Why a rebuilt pump might perform better than before, is probably only a result of it's timing and injection quantity being calibrated.

I don't think that's right.  The main difference seems to be fuel pressure.  When I had the timing belt off and I turned the old pump there was very little resistance which surprised me because high pressure pumps generally are difficult to turn near the break point for the pressure build up.  With the rebuilt pump there was a lot of resistance right near the break point with a noticeable break in resistance when the pump fired at TDC.  The rebuilt pump appears to have much more fuel pressure than the old pump did.

[fspGTD]

Chrissev - That's great your setup works well now - I'm not doubting that.  I'm just questiong your conclusion that all of the improvements were the result of an injection pump rebuild.  You are correct that adjusting the fuel pressure regulator setting is part of the calibration of pump timing.

It sounds like you changed more than just having your pump rebuilt.  You used the different core pump, so it could have had less wear on it's nonrebuildable parts.  In fact, it sounds like you got a pump of a non original specification (did you check the bosch number of both your old pump and new to see if they matched?) because you mentioned your replacement pump did awa with your cold start idle speed linkage.

It also sounds like you installed rebuilt injectors at around the same time your swapped to a different injection pump.  Could your rebuilt injectors have been responsible for some or all of the improvements you mentioned?  I have noticed the same improvements as those that you mentioned after replacing old tired injectors with new fresh ones.

[chrissev]

It sounds like you changed more than just having your pump rebuilt.  You used the different core pump, so it could have had less wear on it's nonrebuildable parts.  In fact, it sounds like you got a pump of a non original specification (did you check the bosch number of both your old pump and new to see if they matched?) because you mentioned your replacement pump did awa with your cold start idle speed linkage.

No, the numbers don't match.  The pump I got is from an 85 turbo diesel.  My car is an 88.  I no longer have the two detent idle speed boost on the cold start linkage.  As far as I can tell, you can put an 85 pump in an 88 without any issues.  

It also sounds like you installed rebuilt injectors at around the same time your swapped to a different injection pump.  Could your rebuilt injectors have been responsible for some or all of the improvements you mentioned?  I have noticed the same improvements as those that you mentioned after replacing old tired injectors with new fresh ones.

The rebuilt injectors went in around the middle of last December.  They made no difference.  The pump went in the first week of March.  That was when I noticed the big change.  My old pump had a lot of miles on it though.  The odometer on my car stopped working at 360,000km and the car was driven for quite a while after that.  When the engine was rebuilt there was no compression at all in one cylinder, other three were low, and I don't know how many miles were on the car at that point because like I said the odo stopped working.  The pump was never replaced.  I am guessing that it had quite a bit more than 400,000km on it, but I can't be sure.  I put another odometer in the car after the engine was rebuilt so I know how many kms are on the rebuilt engine.  So you could be right, my pump may just have been really worn out, and the rebuilt one I got might have had very few miles on it when it was rebuilt.  Who knows?  All I know is it works.

[fspGTD]

Gotcha.  So it was the pump not injectors, that is interesting...  Thanks for the feedback.  Congrats on getting it running well!

[texaseric]

Gotcha.  So it was the pump not injectors, that is interesting...  Thanks for the feedback.  Congrats on getting it running well!

fspGTD -- Can you recommend a source for new or rebuilt injection pumps for 1.6 TDs??