Trackday exhaust (thanks Clive)

[dnb]

While I did some electrickery on Clive's Griff, he started putting this together for me:

I'm using an Edelbrock SDT silencer instead of the original non-silencing silencer and hoping to reduce noise by at least 14dB.




It's 2.5" tube all the way now instead of having the 2" sections, so it should flow well. Just the 3" section between the manifolds and the silencer to go now.

[Uncle Fester]

There’re a lot of us in the same position; tuning modifications having made it too noisy for the track.

If this works, will you be selling them Clive?

[clive f]

its the silencer that Daves got that should be doing the work, we`ll see what its like when he`s got it up and running.although the 2 1/2" tube at the back will help. I`ve been running that myself for a while now.

I am working on some new silencers in conjunction with Joo at the moment, trying to achieve trackday db without losing power, and will be testing at trackcar solutions on a cerb before xmas, so if these , or one of these work, then no reason why we cant do the same on the griff/chim.

if anyone wants their car rewired, dnb`s your man


Dave, is there ANYTHING, Nic does`nt let you do in your front room!!

Edited by clive f on Sunday 30th November 08:49

[EvoDelta]

dnb said:

I suppose that's one use for old floppy disks!

[Guillotine]

...and it was only yesrerday that we were all bragging about how loud the cars were!

Me included.

I have 3 exhausts for mine now.

1. Std system for when the aero's off and the cars "std"

2. Aero on LOUD! (115db)

2. Aero on Race. (103db)

All allow good flow and don't reduce power much, but for 100db days (Bedford/Combe/GWood) I still need an extra TD can in the back!

Nice looking pipes Clive.

[dnb]

No slash cut yet, but there will be once we know where it needs to be.

[zombeh]

Looking good, you'll know it's quiet enough when I can't hear you from my desk 5 minutes before you arrive.

[steve-V8s]

Just a point of interest, I am certain you have measured it all up, however… I had a nice new box made up to replace the “sound like you are going faster” one that a previous owner had fitted. All looked good until the fitting stage when it became obvious that something was fouling. I had previously wondered why the original box had a “dent” in the top, it is there to clear the prop shaft UJ. If your new box is the same size as the old one but without the “dent” you may find things a bit clattery when the prop shaft is rotating.

[dnb]

The new box is slightly thinner than the old one, so I hope I can get away without taking a hammer to it... I haven't measured properly yet because there's no prop and diff in the car.

[dnb]

Bit of a delay while a certain AJP Griff was built...

But here's an update:

The exhaust is all together, using the original flexi section. Clive can just be seen finishing off the tail pipes.



It sounds very good, and seems to be less restrictive than the standard system
Noise is reduced by 5dB at idle, down to 92dB. No data for 4k yet, but it sounds like it's a considerabe improvement, even if it does sound more NASCARish.

Maybe some absorbtion silencers in the tail pipes will prove necessary, but I hope not.

[Simon Says]

Well done,what a nice bit of kit especially like the smooth 1 into 2 section at the before the silencer very thoughtful how will this compare noise wise against an unmolested stock system?

[dnb]

My car had an umolested stock system

[dhf]

More NASCARish,love to hear a sound clip of it..........

[zombeh]

apparently you were spotted today and it's "not very quiet"

[Simon Says]

dhf said:

More NASCARish,love to hear a sound clip of it..........