Support brace no longer fits with new headers + egr tube replacement

[devvy]

Hey all. Finished installing my new bbk long tube headers today, and I’m running into some issues. Firstly, the support brace thing that’s under everything under the car hits the headers now so I don’t know if I should modify it myself to fit or if there’s a specific replacement for it? Secondly, the EGR header to valve pipe decided it doesn’t fit and in an attempt to fit it, it broke. What specific egr tube should i replace it with, and are there possibly flexible ones? In the picture is the hole in the header for EGR and the EGR thing. Thanks.

 

[RAU03MACH]

Egr tube

I went lows and matched the tube
With some copper tube or aluminum tube
You will need a flairing tool to flair out the ends and make the length you need

Just don't forget to put the original nuts back on you will need to reuse

 

[Musturd]

The brace underneath you’re fine with out it

 

[MachSVT]

The subframe support brace isn't crucial if you like going straight and aren't concerned about handling prowess in the turns...less weight!

It's been a long time since I've had a stock support brace, but believe you can shim down with longer bolts and some washers / shims?

Stifflers / Maximum Motorsports / etc. offer these braces which are much more sturdy. I believe all offer shims along with the bar so you may alter for clearance.

EGR??? What's that??? ...note sarcasm

 

[shovel]

Some people have fabricated replacement EGR tubes from copper tubing, reusing the original flare retainer nuts from the original one.

You can also potentially reuse the original one, it's stainless steel and can be tig welded.

EGR improves throttle response and reduces fuel consumption at part throttle by keeping dynamic compression ratio more consistent and prolongs the life of exhaust valve guide seals and oxygen sensors by keeping combustion temperature more consistent. It's never active under heavy throttle and can never cost horsepower, it happens to also reduce CO and NOx production for healthier air so it's a win for everybody whether they care about air quality or not.

 

[MachSVT]

Some people have fabricated replacement EGR tubes from copper tubing, reusing the original flare retainer nuts from the original one.

You can also potentially reuse the original one, it's stainless steel and can be tig welded.

EGR improves throttle response and reduces fuel consumption at part throttle by keeping dynamic compression ratio more consistent and prolongs the life of exhaust valve guide seals and oxygen sensors by keeping combustion temperature more consistent. It's never active under heavy throttle and can never cost horsepower, it happens to also reduce CO and NOx production for healthier air so it's a win for everybody whether they care about air quality or not.

There were 2 questions...

1. The support brace no longer fits due to headers - I answered that one per my experience / factual info.

2. EGR tube replacement / repair - I did not answer that one because I have no experience with EGR repair. I did did give a satirical response in fun.

Here is what I know to be true concerning comments about EGR:

1. False - EGR does not improve throttle response:

Quite the contrary in fact. Two things impact throttle response on a cable actuated throttle: 1. Lean(er) air fuel mixture 2. Increased power production, which leads to #2.

2. True - EGR of course reduces fuel consumption:

This is due to oxigen is replaced with nitrogen (N2), carbon dioxide (CO2), water vapor (H2O), carbon monoxide (CO), unburned hydrocarbons (HC), nitrogen oxides (NOx), and particulate matter (PM). The less parts oxigen, the less parts fuel, the less power produced in combustion. This is easily shown in engine management fueling tables. This is why vehicles must be retuned if removing EGR. If they are not retuned, they will run extremely lean during EGR duty cycle.

3. False - EGR does not keep dynamic compression more consistent:

Consistency would connotate "stays the same". EGR reduces dynamic compression due to the impact of less oxigen consumed during the intake stroke, as outlined in #2. It does not stay the same because dynamic compression would in fact increase when the EGR valve is closed.

4. False - EGR most definitely does not prolong the life of exhaust valve guide seals, oxygen sensors, etc.:

This is primarily due to the increased carbon buildup / particulate matter caused by recirculating exhaust gases, which will accompany the already prevalent combustion byproducts which is deposited in the oil and is suspended / partially removed in filtration. This obviously leads to wear on components like piston rings, liners, and valves.

5. True - EGR definitely improves air quality:

This is due to the aformetioned continual recycling of the aformentioned nitrogen (N2), carbon dioxide (CO2), water vapor (H2O), carbon monoxide (CO), unburned hydrocarbons (HC), nitrogen oxides (NOx), and particulate matter (PM).

I'm not knocking those who choose to run / are pro environment / must run due to laws, but wish to be accurate and factual regarding pros / cons.

 

[shovel]

Might want to get your money back from uni.

 

[MachSVT]

Might want to get your money back from uni.

No money spent...all paid for over 25+ years in the automotive aftermarket. You?

I did not come up with emissions systems / controls as they pertain to the physics of petrol automotove internal combustion engine.

 

[shovel]

Might want to bake a bit longer. I'll help you out: under part throttle the intake manifold is under vacuum so your geometric compression ratio might be 9:1 but dynamically you might only get a half gram of air into the cylinder which means your compressed cylinder pressure at top dead center is... less than 1 atmosphere. you ever try to start a campfire above the tree line? gas doesn't like to pop much in thin air either.

If only there was a convenient source of molecules to shove into the cylinder to take up space without throwing off your air to fuel ratio...

 

[MachSVT]

Might want to bake a bit longer. I'll help you out: under part throttle the intake manifold is under vacuum so your geometric compression ratio might be 9:1 but dynamically you might only get a half gram of air into the cylinder which means your compressed cylinder pressure at top dead center is... less than 1 atmosphere. you ever try to start a campfire above the tree line? gas doesn't like to pop much in thin air either.

If only there was a convenient source of molecules to shove into the cylinder to take up space without throwing off your air to fuel ratio...

Shovel is the perfect forum name, because you sure are digging a hole with this one!

1. Oxygen is not present in less than 1 atmosphere, therefore, no combustion.

2. You are correct that your compression ratio would be less than 9:1...much less...in fact, it would be zero, as there is nothing to compress!

Checkmate!

 

[shovel]

Oh dear.

 

[95opal]

Shovel is the perfect forum name, because you sure are digging a hole with this one!

1. Oxygen is not present in less than 1 atmosphere, therefore, no combustion.

2. You are correct that your compression ratio would be less than 9:1...much less...in fact, it would be zero, as there is nothing to compress!

Checkmate!

May want to rethink #1

 

[MachSVT]

May want to rethink #1

Hey…I’m open to proof. Again, the principals are not my own, but they sure seem to rub some the wrong way?

Again, the OP’s questions have been answered. If anyone wants to dispute, feel free to DM me or start another thread.