potential exhaust restriction

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Re: potential exhaust restriction

by MadMaxedAtom » Sat Dec 29, 2007 2:44 am

Shorty Supertrapp with 24, 3" discs made 89db@50' from my stock "300" Ecotec Atom last year.Minimal BP.(measured < 1/2lb.) :tu: :tu:

Re: potential exhaust restriction

by positron » Sat Dec 29, 2007 1:36 am

yet another use for the nomex suit!

Re: potential exhaust restriction

by shinoo » Fri Dec 28, 2007 10:18 pm

Good work!  Getting onto Laguna is worth the scrutiny and flames.... ;D

Re: potential exhaust restriction

by positron » Fri Dec 28, 2007 5:12 am

I was just over with poot can and no disks, so I'm hoping that with the radial deflection of the disks I can go a large number of disks to minimize backpressure. I was getting some backpressure with 21 Image  so I'm going large at first. If'n I still blow sound I'll take a couple out at a time till I get run out. You can ask for 3 sound checks plus the three black flags per day, so in four sessions I should be able to dial it in.

Re: potential exhaust restriction

by DarthChicken » Fri Dec 28, 2007 4:08 am

30-35?  Isn't that gonna defeat the purpose of the sound reduction...aren't you gonna be too loud again?

Re: potential exhaust restriction

by positron » Fri Dec 28, 2007 3:37 am

[quote="Positron #73"]


This just in...the sound God's smiled favorably on the patient - 87.6 dB flat out 3rd & 4th gear with 21 disks.. I'll add more until I get to 91.

How it sounds..
[/quote]

Spoke with Supertrapp (which I should have done first) and they suggested that I run 30-35 disks on a forced induction car, so I'll be stacking another package of 12 for the mid Jan trip.

Now let's all have good weather thoughts..

Re: potential exhaust restriction

by CalScot » Thu Dec 06, 2007 3:57 pm

[quote="Positron #73"]
[quote="CalScot"]
John Holmes,
Your awsome. Damn If I had my Atom out of the shop, I was going to be there. Next time, next time for sure. What nice weather ;D
[/quote]
Mid January I think, is the next date I'm looking at.. are you going to have the big ponies in by then?

Weather was grand! Excellent forced induction temps.. :tu:
[/quote]
Mid January should be good. I am still hoping for the car back by Christmas, but that looks less likely by the day.  All the parts are now in hand. Just need the exhaust finished on fit up, and out comes the engine. Biggest delay on the engine build is the head getting shipped to Endyn. All the other engine work is local. Christmas is still posibble!
I am looking forward to many track days in 08. Looking for the right enclosed trailer for my needs right now for a January purchase.

Re: potential exhaust restriction

by bolus » Thu Dec 06, 2007 6:42 am

Im definitely going to miss my supercharger :(

Re: potential exhaust restriction

by positron » Thu Dec 06, 2007 5:19 am

[quote="CalScot"]
John Holmes,
Your awsome. Damn If I had my Atom out of the shop, I was going to be there. Next time, next time for sure. What nice weather ;D
[/quote]
Mid January I think, is the next date I'm looking at.. are you going to have the big ponies in by then?

Weather was grand! Excellent forced induction temps.. :tu:

Re: potential exhaust restriction

by CalScot » Thu Dec 06, 2007 4:41 am

John Holmes,
Your awsome. Damn If I had my Atom out of the shop, I was going to be there. Next time, next time for sure. What nice weather ;D

Re: potential exhaust restriction

by DarthChicken » Thu Dec 06, 2007 4:37 am

Awesome  ;D

Re: potential exhaust restriction

by positron » Thu Dec 06, 2007 4:34 am

[quote="Positron #73"]
Thanks for the compliment, if it was that big and shiny it would be out on display as well..Image

For those who have not been around Laguna Seca at speed it is has a siren's song that is irresistible. (albeit under 92dB)
http://en.wikipedia.org/wiki/Siren

I've accomplished something the factory(s) could not..
[/quote]

This just in...the sound God's smiled favorably on the patient - 87.6 dB flat out 3rd & 4th gear with 21 disks.. I'll add more until I get to 91.
Image

How it sounds..

Re: potential exhaust restriction

by positron » Sun Nov 18, 2007 12:50 am

Think very driving full throttle at Laguna Seca... Image otherwise going back to the Caddy..

Image

Re: potential exhaust restriction

by bolus » Sun Nov 18, 2007 12:03 am

I know positron has it just for function but I think it looks cool.  Very baja-bug like
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Re: potential exhaust restriction

by rfmarz@frontiernet » Sat Nov 17, 2007 11:14 pm

Yeah Bruce. That's REALLY hangin' left! :laugh:

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