Increasing EGR flow for better mileage

[Ford Man]

Originally Posted by Daox

That is very likely because the EGR system was not working properly in the first place. When an engine enables EGR it has to alter ignition timing. If the EGR system is clogged (which is common because it is a dirty system), the ECU will enable EGR, alter timing, and since it isn't working properly you'll loose power. A better bet for you would be to remove the EGR valve and plumbing, clean it out, and reinstall it.

The car had less than 5000 miles on it when this was done and I bought the car new.

[Daox]

I received the EGR cooler the other day and unpacked it this morning. It looks like it will fit my application. The pipe has an ID of about 1" which is huge compared to the stock Paseo EGR setup. This should do nicely.

I'm still searching for an EGR valve. I'm kind of leaning toward a TDI or other diesel setup since it appears they are flowing much more exhaust gas through their engines.

I am confused when I look at the TDI EGR valves though. They appear to have two vacuum actuators on them. Could one of you TDIers help me out?



Here is a shot of the inside.

[tasdrouille]

TDI EGR valves aren't cheap.

The assembly is actually two valves, the EGR valve, and the anti shudder valve.

[Daox]

What is the anti shudder valve there for?

[tasdrouille]

To get a smoother engine shutdown, and it also ensures the engine actually stops when you turn the key off by starving it of air. Even if fueling is cut, if engine oil gets in the combustion chamber, like when a turbo seal fail, you can get a runaway, so you want to make sure the engine stops.

[tasdrouille]

Used EGR Valve ALH - TDIClub Forums

This one went for $40. Maybe you could post your looking for one and get lucky.

[Daox]

Thanks Tas. I'm still looking at alternatives, but it seems like diesel EGR valves can flow more EGR than gas engined valves. I'll continue my hunt.

[TestDrive]

FWIW

Yesterday in http://ecomodder.com/forum/showthrea...html#post94649

Originally Posted by Tygen1

I think I found one, and a wealth of knowledge from this MIT paper: http://dspace.mit.edu/bitstream/hand...pdf?sequence=1
It's 115 pages, so don't start it unless you got some time It's quite in depth and covers many effciency topics including EGR dilution, NoX reduction, Lean Burn and Hydrogen boosted Lean burn. Quite in depth.
The first chart is the baseline without any EGR function, the second is with 10% EGR dilution and the third is with the Hydrogen boosted Lean Burn.

[Daox]

Thanks for the link TestDrive. It looks like I have some reading to do.

[TestDrive]

You're welcome. Though having skimmed through it now, the data seem a little tangential to what you're doing.