egr tuning question

[SgtMarshal]

if the egr air temp disable is set to 140 will the egr ever kick on? the stock setting is -40. I'm trying to get my highway gas mileage better, and am wondering if this should be set to the stock setting, or if changing it will cause any problems.

 

[Fivefingerdeathpunch]

I'd change it back to stock, just so it can open at any temp if needed.

 

[Frosty]

With proper tuning you can get almost identical mileage without the egr. Without proper tuning you will lose 5+ mpg without the egr. Leave it alone unless you know how to delete it.

 

[SgtMarshal]

I'm putting it back to stock, I dont think it was tuned properly because I rarely get 30+ mpg like I used to.

 

[Frosty]

To do a proper egr delete you first physically delete it with blockoff plates and whatnot and removing the valve from the car and taping the plug up. Then you disable all the egr codes. Set the egr diagnostics temp to whatever the max is so it does not try to run. Then assuming you already zeroed out your other spark modifier tables you set your cruise cells to ~40* of timing advance. I personally use 43* running e85.

 

[SgtMarshal]

I dont plan on deleting the egr, I would rather have the fuel economy. when I tune my timing tables for gas mileage on the highway do you know which tables I advance the timing on using dhp or tiny tuner? When I am cruising on the highway at a light load I typically see +35 of advance, and I am pretty sure the tables I change are the normal/cruise tables but I want to make sure.

 

[Frosty]

I have never used dhp or tiny tuner for timing adjustments. I just use the high octane and low octane tables in hptuners generally.

 

[231FUN]

They make such a filthy mess of the upper intake...I run one on my daily but no darn way will I ever run one on the modded car.

 

[SgtMarshal]

I dont see why they would cause issues on a modded car, all ive done so far is a full size intercooler and it hasn't caused any problems that I know of. All its really going to do is keep the supercharger coating in good shape.

 

[231FUN]

I dont see why they would cause issues on a modded car, all ive done so far is a full size intercooler and it hasn't caused any problems that I know of. All its really going to do is keep the supercharger coating in good shape.

Issue for me is the filth they pour into the engine, why would I ever want exhaust flowing in the intake of my built motor over fresh clean air.
The modded car is a play toy only, don't care about fuel economy.
How does an egr keep supercharger rotor coating in good shape?

 

[SgtMarshal]

It puts a protective film over the rotors

 

[Impala131]

In my experience, the fuel economy loss from EGR delete and fuel economy gain by increasing cruise timing are completely separate. The timing increase can help compensate for an EGR delete, but increasing timing while leaving the EGR functional is an even greater net increase.

As far as cruise timing, I'm finding the best values between 40-45*. I really haven't seen any measurable gain after 45*, even with zero KR.

 

[SgtMarshal]

I'm looking at the stock 2005 GTP good fuel timing tables and will probably end up copying those over. my only concern is that I have a local tuner friend who did about 6 hours of adjustments and if I change the timing tables how will it affect the o2 levels?