Camaro_640

Im Down in NC, and Im Headed Back home to Maine in a few weeks, I have a L05 with some Mod's and I'd like to Hook up a Vacuum Pump to the EGR, and run the line into the Cab area, So When Im Cruising at 65/70 I can Use the EGR and Save some Fuel!! Ihad the EGR stick Wide open on me Awhile from Checkin the diapram, Sounded like a HUGE cam in the car.. and i was drving around in city and was getting thumbs up and people yelling YEA MAN!!!! But I was like, this thing isnt running right.. damn it.. But i didnt say anything.

Ended up getting 23mpg all city for a week with the EGR open. I'd like to Do that going down the Interstate, Id imagine that i'd get about 30's or something close.. Better than 14 ive been getting!

Is there Anything you guys have done like this? Should I Turn on a Solenoid next time? or does the Vac pump to the EGR seem Fine?

slow_90firebird

Interested in this too...

personally I have tried hooking up the straight 100% vacuum line (that goes into the EGR solenoid) straight into the valve. It did nothing.

Camaro_640

The ECM Grounds the Solenoid for the EGR, So Im thinking... Ground the Solenoid and then pump up the EGR.. But The EGR Operation depends on Back pressure, Im not sure on how much, But I dont have very much. But it made one Hell of a Diffrence the time it stuck Wide open thats for sure! anyway this would be Very nice For Highway Driving for sure.

gunner53227

Did you feel a difference in horsepower?

Camaro_640

well i wasnt Racing or anything But Im gonna say yea anyway, because of how the whole thing works.

The Gases the EGR is Recirculating are not going to Reburn, other wise if it did the EGR system wouldnt operate like the Engineers had designed it..... As they had Keeping temperatures in the Combustion chambers down and Reducing NOX by taking up space in the combustion chambers with a Non Flammable Matter that doesnt Change your AFR....

Hope it makes sense, I just woke up from a nap...

nimrod_sixty9

???? Can we get this in layman terms???? Are you saying you bypassed the EGR altogether? Will it work on an LO3? How bad did it kill HP?

Camaro_640

No, I compressed the Internal Diaphram inside the EGR to See if it was Siezed, and Little did i know the Diaphram Stuck... It didnt really Kill the car.. But made a Noticable change... after all.... Your Pretty Much Making the combustion chamber Smaller........

nimrod_sixty9

How about a permenent set but with much less recirculation/flow? Could that work to find a median, improve a little bit of gas mileage with out killing too much HP?

Camaro_640

Yea, Thats Why i was Going to Get a Vac Pump and hook it Directly to the EGR unit for my 1,000 Mile Trip...

EGR Cannot be open during Idle.... Or it'll Shudder like a ****! Im talking about Highway Driving.. That Experience I had Wasnt the Greatest... But Couldnt believe how many miles I collected that week... all city, Stop N' wait.... then Go and stop n' Wait again...

nimrod_sixty9

Could you explain your proposed setup? I was thinking something along the lines of a valve that you can manually open and close. Basically only open it at highway speeds.

Anyone else have any input on this? Is this typical results, should it happen like this?

Camaro_640

Thats What the Vac Pump is for....... Manually Opening the EGR.....

The EGR Valve is a Valve..... Whats wrong with it? I can open Mine Sucking on the Line... and close it 100% by blowing Back, Which is Good to Know In case it Sticks...

nimrod_sixty9

Sorry dont understand the EGR system on these cars... or lingo for that matter

Camaro_640

The EGR Valve, Exhaust Gas recirculation valve.....

When a Certain, Temp and Throttle Position are met the ECM Grounds the Control Solenoid which opens a Valve for ported Vacuum to Reach the EGR valve, and opening it a Certain amount........ The ECM Controls the amount of egr position by pulsing the Ground Ckt of the EGR Solenoid on and off, Which Changes the Amount of vacuum to the EGR..... the less vacuum the more its Closed, and vice versa...


I dont think going 65-70mph Down the highway with Very little Back pressure and having the EGR Wide open is going to Hurt anything......

nimrod_sixty9

Thank you for the clarification. What I ment when I said valve, I meant bypass the EGR and mave a manual valve that you adjust. But of course Id imagine it would screw the computer...

Stephen

iTrader: (12)

How is the EGR gonna affect MPG? I thought it was merely for emissions.

nimrod_sixty9

Its deff to help MPG, but never knew it was this significant. I know when my 2000 Birds EGR was stuck in close position, I lost highway MPG.

Stephen

iTrader: (12)

Are you saying you went from 14mpg to 23mpg, just by getting the EGR working?

I find that EXTREMELY hard to believe. Actually, I call that impossible, on EGR on/off alone.

Camaro_640

Did........ I can get the reciept from the recent fill up and the Mileage i had.

The EGR was WIDE OPEN.

Are you saying the Fairy Gas mother came and put gas in my car?

nimrod_sixty9

Like I said significant...

My car maybe lost 3 MPG, and it was prob less cuz I only realized it on a long trip...

I dont really see this happening either...

Camaro_640

Had 209 Miles on the odometer, and Took 8.964 gallons to fill it up...... at 4.09/gal it cost $36.66


Theres 2 options here......... Either i got what i got...... OR That Gas pump is Rigged........ but my gauge did read a hair above 1/4 tank

calamitascamaro

iTrader: (5)

Okay how does this essentially make the compustion chamber smaller? And if that were the case would that bring up your CR making your engine more efficient, and maybe thats where your getting more mpg? But conversely wouldn't that give you more power?

Camaro_640

Well, All I know is, With that thing Wide open... I saved a fwe bucks within the week...

And Would like to do it again on the way back to maine..... seems to me everyone is saying BS........ I didnt know if anyone had come up with something or not.... But I'll try it out on the Way back home, and See if it changes from when i came down here....

calamitascamaro

iTrader: (5)

I'm not saying BS at all bro. Just confused I guess. I would love to find out something comes of this, cause I'll be right behind you in seeing if it works.

Stephen

iTrader: (12)

I can see what he was getting at...kinda. The space being already occupied by EGR gases, but I doubt it would make any kind of impact on the CR or MPG.

15 gallon tank.....9 gallon fill up....1/4 tank left.....Doesn't add up.

I know our gauges aren't that precise but....Below a 1/2 tank they getting pretty close to precise. That's my mine barely moves for the first 150 miles, then plummets FAST!

9mpg increase from JUST the EGR? Don't get PO'd but.... <--my perception

Camaro_640

I head Back aug 1st.. Im anxious to see what it gets on the interstate.

If i remember right i had to fill up 4-5 times on the way down...

I'll Head off with a Full Tank of Gas.. Using the EGR 100%, and when i have to refill, I'll do the math real Quick.. and then try it without the EGR for a tank.. Do the math and see wtf..... I'll wake this Thread back up in the begining of august with results.

cdacda13

Ever thought about putting the wire that leads to the ECM on a switch, then ground the wire? With a full 12V, it would open the EGR all the way and you would be able to shut it off if you hit traffic or get pulled over.

Camaro_640

and when it sticks like last time?

Theres Vacuum pumps that can Pull Vacuum and pump up some psi.

ownor

iTrader: (5)

hey,

i'm curious what the results will be. is that egr valve still stuck?

i actually believe that mpg jump, if the engine only needs like half of the fuel because the other half of the combustion chamber is filled with exhaust gas..

the normal operation of egr only works under very precise parameters if i remember correctly, so that's why a stuck valve will yield much more mpg than just a normal egr would do. sounds reasonable to me.

let us know!

regards
ownor

APACHE JOHN

I'm gonna call BS on this one.

S105.7

i can't see the solenoid much liking 100% duty cycle. its also going to require a ground, not 12V.

drowning in tbi

The EGR system was developed to cool the combustion process, lowering NOX and reducing PING. As exhaust is an inert gas, in the RIGHT ratio, it shouldn't affect performance. Obviously too much and it REALLY affects performance. What CAN actually take place for MPG...You reduce pumping losses and manifold vacuum by placing this inert gas in the stream. It takes POWER to make vacuum. Now your O2 sensor sees this as a rich condition and starts taking away some fuel, your MAP may add fuel due to lower vacuum. So you have to trim this in your bin. Remember how the O2 sensor works-it generates voltage in the ABSENCE of oxygen, exhaust (before the cat, with A.I.R. off) has very little oxygen, with EGR open, even less. I'll let you chew on that awhile.