Since I've installed my Weber and removed the emissions, the sound from the engine is really loud. The best way to describe it is the revving sound you hear from a bus or 18 wheeler when they're accelerating in low gear. The truck is running fine but I feel like I almost need earplugs for long drives. Is this normal?

I took it to my mechanic who looked it over and he didn't seemed concerned. He even complimented me on the carb installation.

 

Sounds normal to me. Even a stock carb gets a lot louder with an open element filter like the Webers.
I have seen a weber filter assembly that uses a cone filter and a pipe from the carb. That might be slightly less noisy.


http://www.lceperformance.com/Weber-Carburetor-Hat-w-Tube-Kit-w-o-Air-Filter-p/1035031.htm






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It's normal for it be louder.. Mine makes a hissing sound like its breathing ALOT of air I kinda like it

 

Did you block/plug the air injection lines to the exhaust manifold and remove/block the egr? I did a full exhaust when I did mine so I can't comment on noise levels because mine is LOUD but a resonating "BWAAAA" is normal under acceleration for an open intake.

 

Yes and yes. It's crazy loud and everyone else I've talked to is like, "well, yeah, your engine can finally breathe". I'm just not use to these things as this is my first car to modify in such a way.

 

If it's too loud to be comfortable you could consider installing some dynamat or other sound deadening insulation on the firewall/floorboards. It's a bit expensive but it definitely makes a difference. Personally I can't get enough of the engine noise out of my 22r but i'm still running the stock carb/exhaust. (not for long though)

 

Use mlv(mass loading vinyl on floor/firewall to lower front and road noise, Ur truck already has deadening material used on floor boards. Only place that will need deadening is doors(for audio purpose),roof(it's flexes during driving and creates a resonances), I wouldn't worry about back wall needing deadening(unless for audio), use mlv around and your truck will be quieter,

 

I second this. Dynamat (and it's competitors) of sound damping/deadening are for resonant vibrations, not airborne noise. Once it leaves the motor and gets into the air, you need a sound barrier. MLV is the most popular choice due to availability, though the lead sheet/foam sandwich (lead sheet between foam) is another very good option. MLV is easier to find, Lead sheet sandwich is better for irregular surfaces.

A good barrier is worth 5-10 layers of deadener against ambient noise.

 

thanks that's good to know i'd never even heard of mlv - i'll apply this knowledge when doing the firewall on my old school bus, i wouldn't personally put any of these products in my truck though i'd rather hear every noise it makes. (also i don't have a stereo and don't want one because it would just get in the way of the engine noise)