HE200 and Giles 1.6 IP in a 1.9 AAZ Vanagon

[Gizmoman]

I didn't want to sidetrack theman's 36 page post so here's a new thread starting off with Alcaid's reply.

Will it boost more if you let it?

I have a DIY boost controller that dumps boost at 20 psi. 20 really requires an aggressive WOT and the EGT's climb right along with the increase in boost. At 1250F I back off.
I increased the fuel screw from Giles original setting about a 1/2 turn and had to lower the idle to compensate. This greatly improved the low end torque as boost now comes on at 1800 instead of 2K. The idle screw is backed off all the way and any more fuel will require changing the throttle position.

I keep hearing that Boost will lower EGT - makes tons of sense - but it seems the fuel also increases proportionally and EGT's continue to climb. I don't know enough about the IP to know how to adjust that ratio.

I just sent Giles an email with the changes I have made as he originally set the pump up for the K-14. Hopefully he has some ideas.

[libbydiesel]

The boost pin is eccentrically cut so that one side is a more aggressive angle than the other:



If you rotate the cone so that it is the less aggressive angle that the feeler pin rides on, you will reduce the rate of fueling increase.  You can also add pre-tension to the boost pin spring in order to reduce the rate of fueling increase. 

[Alcaid]

The LDA is normally bottomed out anyway at pretty low boost pressures so any higher boost pressure will not give you any more fuel at all. Just more HP and lower EGT. This engines really need air

[libbydiesel]

When the boost pin bottoms out depends on which spring Giles installed.

[Alcaid]

He is running 20psi already, pump was set up for a K14, should't be any travel left in it

[Alcaid]

And Gizmo, I know you love DIY but those NXS boost controllers on ebay are fairly cheap, easy to setup and works very well even on higher boost pressures

[Alcaid]

Is it still a 9mm pump btw?

Bigger pump with shorter duration for the same amount of fuel would give you lower EGT as well but that costs $$$

[Gizmoman]

Is it still a 9mm pump btw?

Bigger pump with shorter duration for the same amount of fuel would give you lower EGT as well but that costs $$$

Don't know what Giles did to the pump. I was very clear on the application though and he said he could provide enough fuel for 120 HP with no problem. He also provided four new injectors as well.

As for the DIY boost controller, I could simply remove it and see what that does.

[Alcaid]

Removing a boost controller will only lower the boost if anything

[Gizmoman]

I read and read about the LDA or governor mod in the FAQ's but it only references adding fuel which is not the goal here.
Would turning this adjustment screw do anything to reduce fuel while increasing boost?



I'm not clear why buying a boost controller would be better that the one I made unless it's assumed the one I made is leaking.

I tested it with compressed air several times and it holds tight to 20 psi - at least it did during the test

[libbydiesel]

If this is true...

I keep hearing that Boost will lower EGT - makes tons of sense - but it seems the fuel also increases proportionally and EGT's continue to climb.

...then this cannot be...

He is running 20psi already, pump was set up for a K14, should't be any travel left in it

...or vice versa.

[Alcaid]

Try 25-30 psi without reducing any fuel, and yes I am not joking

[libbydiesel]

I believe that running that much boost/fuel in an AAZ in a vanagon will not be a long-term reliable driver.  I'm happy to be mistaken, tho. 

[Gizmoman]

Try 25-30 psi without reducing any fuel, and yes I am not joking

I assume you mean adjust my controller to hold to 25 psi? Worth a try.

I'd test it today but I just cleaned the diesel off the engine from yet another injector return line pinhole. I'm done messing with anything other than the stock stuff with the braided cover. Ordered some online yesterday as nothing available at the FLAPS.

Possibly I bumped it adjusting the idle and fuel screw but if that's all it takes to make it leak, it's too flimsy.

Any info on that screw on top of the LDA?

I believe that running that much boost/fuel in an AAZ in a vanagon will not be a long-term reliable driver.  I'm happy to be mistaken, tho.

I do not want to do anything that will reduce reliability and will heed your advice libby. That's why I have the boost set for 20. It just seems that I'm getting too much fuel relative to my existing boost. It cruises (65 mph) at low pressure somewhere around 7 psi. A long 3% freeway grade (common here) obviously requires some pedal, and the boost goes to 14 and sluffs of from there - but the EGT's begin to hover at 1150-1200. It all makes sense but just seems like higher boost with a lower fuel rate would lower egt's and allow me to maintain 65 (while being easier on the engine as well).

[Alcaid]

Keeping an eye on EGT I see no problem with it. Remember he has a turbo that actually works at those boost numbers. I've seen 1830F EGT with a 1.6TD K24 running 30psi, turbo is just way out of it's efficient range...