Current setup too loud...help!

[DAMN YANKEE]

Great decision, you wont regret it.

Now...the narrow band question....

85% of your driving is "closed loop" with the engine using your four (4) narrow band sensors (along with other sensors) to be sure your car is staying in the interactive adaptive curves. Yea, with simms your not getting engine lights now...guess what, your not getting your adaptives reacting either. Your car gets zero feedback...nice, everything must be ok cause my engine light is off, right?

There is also a dirty little secret about the stock Viper open loop curves, the stock curves are too lean in the low RPM range (up to 4,000) and too rich in the higher RPM range. AND THAT IS THE STOCK CONDITION. Without the wideband(s), you will never have a clue as to what your car is doing BEFORE all your headwork, etc. etc. and no ability to tune the rig with an engine management system.

Your going back into your exhaust right? Get it ALL done.

My guess is that you do not still have the two at the header and your asking if you need the two at the rear. Well, IMO, you need all four put back in (**** the header or the transition pipe) and while your in there do yourself a big favor and put in a wide band on at least one side as well for when you go WOT and slip into "open loop". Buy a Vec and get then you can actually tune your car and get it to run well. Its simple, there is absolutely no comparison between a well tuned car that has narrow band feedback working in closed loop and one that does not. AND...there is no comparison between a built engine with wideband and the ability to finally adjust fuel and spark in open loop and one that just has the stock PCM.

How hard is it? Piece of cake.

 

[2001 GTS]

I have a Vec1 on it now...but I know it has limited tunability

 

[mike & juli]

Have the VECII and was able to tune the car's richness down a bit. With the Corsa Track Cat-Back Exhaust, flow-thru cats (2 cats removed) and ceramic coated stepped-headers, just a totally awesome sound...not overpowering at all, sounds like what was wanted: A BEAST!!! Everybody does something different, and depends on what Gen Viper you have.
~juli~

 

[DAMN YANKEE]

2001GTS, next on your list....upgrade VEC?

 

[2001 GTS]

Wasn't really planning on upgrading the Vec...don't see the need to at this point. Car is NA and the nitrous is tuned with the jets based on the Vec tuned on motor.

 

[2001 GTS]

Well spent the $300 plus labor to put the the HF roe cats on and....

the drone is still there

 

[Camfab]

I'm sorry to hear that, though it's got to be substantially better than it was, right? All I can tell you is that I've got high flows and the Corsa cat back, with zero drone. New heads, cam and headers may change that equation. I guess, I'll find out soon enough. Is your car essentially stock otherwise?

 

[2001 GTS]

Current mods...but now with cats

Mods: Intake, Ported Heads, Rockers, Lifters...and the following:

1-3/4" B&B headers into 3" exhaust with the Random Tech X-pipe, car only has the Dynomax Bullet muffler in each side and no cats.

 

[FE 065]

Straight thru Dynomax's flow a minimum of 1100cfm I believe.

Bullet mufflers aren't going to do much muffling. Put the fattest case muffler you can under the sill or in the back.

This set up I put together pretty much eliminated the dreaded drone for me when running no cats, and OE resonators still in place. It's only now that I've pulled the assembly off and could get good photos of it.


A little careful massaging with a hammer and some wood to soften the blows, let the two 6"OD Dynomax mufflers fit side by side without having to rework the factory hangers etc.

I took my time hammering one side of each welded end so as not to crack a weld. The welded seam where the end caps meet the body of the muffler puckered out lengthwise a bit in the process, but otherwise survived just fine. Lengthwise in between the welds, the body was easy to flatten.


Before I started, I spent a few minutes measuring and marking the ends how far I wanted them to come in,and drawing lines from one end to the other to be able to keep the desired end result in focus. I think each side had to come in an inch-maybe less, but I did it all last Fall, so I'm not sure on it.


The pipe to pipe centerline distance is the same as OE. There's no problem with vertical clearance in the muffler tunnel at the back.

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The fat case full of high quality Dynomax packing soaks up the sound nicely. I mounted the rear hanger bar backwards to make removal easier for me.

Later when I pulled the resonators, the sound picked up a bit at idle etc, but it was all coming out the tips..


At WOT everything's noisier of course, but again, other than increased engine noise, the rest seems to be all to the rear of the car.

 

[Casey]

A couple turbos will quiet it down at Idle!