NA pump and injector question..

[bevboyy]

I am converting a VW remanned long block to turbo. I added the LDA and did the govenor modification (as per Tintin) to the NA pump.

My questions are these:

1) Do I have to swap out the injectors and run the TD ones? Or can I run the NA ones as they are fresh.

2) Do I have to adjust the NA pump timing with the LDA, or do I leave alone per se..?

[Black Smokin' Diesel]

The NA injectors should be enough if you don't have really high power goals. From a recent post I read on here, near NA spec injectors (135bar) with TD timing yields better MPG than TD injectors (150bar).

[bevboyy]

Yes I read that too. So with the addition of the LDA,  since it is set up for those injectors, I should increase timing to 1.0 like a TD - correct?

[Black Smokin' Diesel]

Yes I read that too. So with the addition of the LDA,  since it is set up for those injectors, I should increase timing to 1.0 like a TD - correct?

1.0 should be good. Mine is about there and it's really really really smooth at idle (or any rpm for that matter). You can hear the engine rattling a bit but you can't feel it at all. I haven't played with fueling since I replaced the head so I don't know if performance wise it's good.

[burn_your_money]

I think I was running 1.0 on my NA rabbit, although that was a few years ago.
I always thought that TD pumps put out more PSI then the NA ones, which is why you had to change the timing?

[bevboyy]

Quote from Libbypapa:

stock idi no turbo 1992
untouched 1600 psi breaking 55mpg
reset to 1850 psi 58 mpg
set to turbo 2250 psi 53 mpg with black smoke and low top end
timing at n/a settings .088 mm

changed timing to turbo 1.00 mm
untouched at 1600 59 mpg
reset to 1850 61 mpg
turbo 2250 53 mpg with black smoke and sputter


So what I am getting here is that if I use the na injectors with the timing bumped up to 1.00mm (same as TD timing) but do not increase breaking pressure, I will improve my fuel consumption.

Add to the mix a turbo and I hope to get more power and better fuel efficiency.

That's my goal.

[knowtwodrugs]

Keep us posted.  I'm picking up a 1990 jetta ecodiesel this week and I'm looking forward to finding that balance between power and economy in it.

[Mark(The Miser)UK]

Quote from Libbypapa:

stock idi no turbo 1992
untouched 1600 psi breaking 55mpg
reset to 1850 psi 58 mpg
set to turbo 2250 psi 53 mpg with black smoke and low top end
timing at n/a settings .088 mm
.

...
Attention
 :mrgreen: Credit where credit's due...

CraigGroomBridge wrote...."Wow I been away too long, where to start....

C/R's gas well established between 8:1 and 12:1.
is more better NO the higher c/rs in race appalcations are for the long bleed ( duration) of the camshafts on the intake lobe I have good experance with this, my last engine for my Bonniville (small block chevy) was a 400 ci with 9:1 comp and i have a dyno sheet for 550 hp. 580 tq.
at 4300 and 3200 rpm

on diesel from 15:1 to 24:1
the higher on pre-comp only this is for starting issues the more movement in air means more heat generated,
Di engines are usally at 17:1 or 18:1
again more is not better.

on this note i finshed with my injection pump experament with results:
stock idi no turbo 1992
untouched 1600 psi breaking 55mpg
reset to 1850 psi 58 mpg
set to turbo 2250 psi 53 mpg with black smoke and low top end
timing at n/a settings .088 mm

changed timing to turbo 1.00 mm
untouched at 1600 59 mpg
reset to 1850 61 mpg
turbo 2250 53 mpg with black smoke and sputter
so
with a stock engine i found with 1.00 mm stroke on the pump and 1850 breaking the best mpg hope this helps

Craig"

[bevboyy]

Yessiree! Credit where credit is truely due! :mrgreen:

[Mark(The Miser)UK]

Yessiree! Credit where credit is truely due! :mrgreen:

Now to redeem yourself if you do a series of tests for mpg/performance with different exhaust sizes.... :lol: