3.2 with no back box??

[KillerDynoSoar]

Hey there chaps,

I have a 77 Carerra 3.0 with a 3.2 1984 engine. The car has been backdated to look more like a 911 R style or R Gruppe hot rod style.

I am going to carry out the following modification after reading up on Pelican. Drilled air-box and Steve Wong chip and also a rear box upgrade.

The stock back box cannot fit under the early rear bumper and so I have had to remove it. I have a standard non Cat Dansk Pre-muffler.

I am thinking that may have to source a Camaro single in and single out Flowmaster muffler box and mate this to my pre-muffler and fab something up.

The thing is I would still like the tailpipe to exit my car from the bumper cut out on the left side. Can you get such a box that inlets flow and exits flow on the same side??

My other Question is; can I run a a pipe from my Pre-muffler directly out of the car acting as a tailpipe?

Will this mess up my cars performance? Good or Bad?
Until I sort the whole flowmaster thing out (its hard to get US parts in the UK) could I run the set up like this?

I know it will be loud, but actually its not that bad. I can quieten the sound using a supertrap for the annual Gov test and remove it afterwards.

What do you guys think?

[IROC]

If you value your hearing or sanity, I would suggest something that muffles the sound more than simply running a pipe out the back from the premuffler. I've heard one of those and it was very loud.

Mike

[ChrisBennet]

I take it "box" is a British term for muffler? Learn something new every day! Welcome to the board.
The muffler will have some effect on your mixture so you should let Steve know what kind of setup you'll be running when you order your chip.
-Chris

[KillerDynoSoar]

Thanks for the help guys, yes back box is a muffler. I'll try my best to use US phrases when possible.

Steve has said that the car may run a little lean but I am only gonna run it like this for a few weeks while I sort my Flowmaster muffler out.

Does anyone know if I can get a single in and single out flowmaster that inlets flow and exits flow on the same side??

Great forum.

[gost]

Don't know if it's too late for this but yes they do make that configuration. Check out their website .http://www.racerpartswholesale.com/flomtech.htm

[KillerDynoSoar]

Hey thanks for that.. Super Trapp claim that adding these discs allows even more BHP ?? interesting.. now to find a UK distributer.

[gost]

Hey Killer, I came back to this post because I was confused about supertrapp and flowmaster and what your question was. I wasn't nuts. Yes Flowmaster makes a I believe Series 80 muffler in Stainless that has in and out on same side. I have to look into supertrapp myself.

Tally ho

[KillerDynoSoar]

Yes sorry the Box does mean the same thing as the muffler.

Gost: Thanks for getting back to me. Well in the future I will order a Flowmaster muffler but for the moment I am using the muffler bypass just like you are buddy.
I think that I must get a Supertrapp so that I can actually run the car through goverment tests and also so I will be allowed to take my car onto the track. I have a friend travelling to the states in the next day or so and I am hoping to be able to get a SuperTrapp end for my muffler bypass pipe.

If you do discover which supertrapp would fit the bypass pipe then please let me know. I think the difficulty in this is that the end of the muffler bypass has a slash cut to it so it maybe tricky to actually fit the supertrapp.

Your thoughts?

[greglepore]

I have the setup you describe with a Flowmaster. Can't remember the part # now, but if you search here for flowmaster and Roush Mustang you should find it-I believe that was the original application. Sounds great, no drone.

[911-32]

You can get Supertrapp products from Demon Tweeks among others in the UK. Typically the 4 inch disc you would want is about £44 + VAT. Google will direct you to other UK suppliers.

I think the Supertrapp discs will be lucky to reduce noise by more than a couple of dbs - which will not get you even close to the typical 102db UK track day noise limit (measured 1 metre from the tailpipe at 45 degree angle at 3/4 max revs). A std 3.2 is 97-98db and a 2.7RS with single out is 105db. My 3.2 backdated with dual out is louder than 105db and you will be louder again! Just IMHO !

HTH
Richard

[MIK911]

Here's my '86 w/ Flowmaster 1in/1out.

Flowmaster: my turn (pics)

Mike

[KillerDynoSoar]

Richard: I did a search.. Deemon Tweeks site says that the Supertrapp is only suitable for 150hp cars. Also when I called the guy didn't know what he was talking about.
Hmmn if the case is that the supertrapp won't lower the sound enough then it would be a waste of money.
Looks like I may have to go for the flowmaster after all.
In the meanwhile I am going to test my own little rig that I have, where I have got a end tail pipe turn down that bolts to the end of the muffler bypass. I have dilled it to accept 2 bolt in a cross pattern right on the tip. I'm gonna stuff it with some steel wool and hopefully that will baffle the sound enough. If not I'll have to get a custom exhaust made.

By the way Richard click on www.ddk-online.com and checkout some other like minded souls with early cars. We regualrly meet up in and around london, so it may be of interest.

MIK911. Thanks alot for that great link it looks as if I will copy that exact setup on my own car. That is if my temporary rig doesn't do the job. As my car has been backdated I need it to fit behind the RS glass bumper far enough back not to damage it or the paintwork.

Can you get that muffler in Stainless Steel?? If I could get a part number and a supplier I could order it direct from the US.

Once again I appriciate all the great advice.

Alam

[gost]

Killer, I found out that supertrapp offers 2 options for our set up. First is named Wavetech which is a 4 inck tuneable disc muffler and comes with a 2 1/2" inlet which works for us and comes in 8 and 14 inch lengths. This option would require a mating flange to be attached to the muffler to connect to the flange of the pre-muffler. Also because of the angle (as with the fabspeed muffler bypass) an angled spool piece would be required to get it out the rear correctly. The 14" would stick out of the rear valence by about 5" which looks a bit odd so the 8" is the way to go and would fit perfectly with 4" accounting for the spool piece. That set up would replace the fabspeed muffler bypass entirely. Cost is $234 on their site. The other option is their "Disc only caps" which come in 5 inch dia and 2.5 to 3.5 inch inlet sizes. It's only 3 inches in length and can attach to the rear of the muffler bypass pipe that we have on now. Yes we would have to cut the tip angle off so that it would be flush in order to mount the cap, I think, without having the cap I'm not positive but the 3 inch length of the cap would not afford alot of slip on area. 5 inch is rated for up to 400 HP. Mounting would be by simple clamp and cost of the cap is $ 78 US . It comes with 12 discs but you could add up to 8 more for a louder sound.
I'm probably going to install the flowmaster like mike did in his above post. Sounds like a great bang for your buck and they make the muffler in stainless as well. The cap may be good for you on the track and then simply remove it and pop in your flowmaster for the street. All this info is on their website at supertrapp.com.
I spoke with Steve at 911chips and I just ordered his chip and chatted for a while. Nice, nice fellow. He said that he's seen dyno's with the supertrapp and they aren't as productive as the Flowmasters. He also brought up the lean running issue but told me a way to get around it without getting a chip. The DME has an adjustable switch that allows you to increase fuel by 3 or 6% or you can reduce it by 4%. I'd never have known this. Nice of him to tell me. You could do this as well while running with the muffler bypass and then switch back to stock with the Flowmaster. Takes all of a minute to do once you have the DME out.
His site also spells out how to convert your DME to a 4K board as opposed to the stock 2K in the 84 to 86 model years which I have to do because his chips only work with the 4K boards. Involves jumper relocating with a little bit of soldering, again simple.

Hope this helps you and good luck!!

[KillerDynoSoar]

Gost: You are the man! Thanks this thread helps a great deal! I have decided to got for the Flowmaster set up after all. I'll just keep it that way. I was just trying to save a few £££ as the scope creep on my project car has been significant.

Ok so all I need now is to find the part number for the flowmaster Stainless steel muffler and my buddy can collect it next week when he is in the states. Nice fella that he is.

Any leads to the part number of the S/S Flowmaster much appriciated.

[gost]

Killer, I was misinformed about the muffler being Stainless. It's the Series 80 # 52580 which is 2 1/2 inch in and out on the same side and only comes in aluminized form. The most popular mufflers are available in Stainless. I know, bummer. It's at least cheaper. Their website said around $150 US.
If you want to go dual out then it would be the series 80 #42583 w/2 1/2" openings all around.
And...just to screw you up even more...you could do a 3 inch in and 2 1/2 inch duals out with # 43083
Enough? I'm getting the 52580 and am shopping the web as we speak to get the best price. I'll let you know what I come up with later.

Gordon

[gost]

Killer,I shopped a bit and found the muffler for $106 at summitracing.com.
Then I called a national chain here Pep Boy's who price match and beat by 5% so they ordered it for me for a cool $100 + tax. Cheap or what?
Let me know if you want me to help you out someway like I buy it here and ship it to you. Might be cheaper for you that way. It's a pretty small muffler. I sold some stainless brake lines to a chap in your area a few weeks ago and that only cost $9. Let me know

[vash]

Originally posted by SoCal911SC
Box = muff?!?

that is funny!
but technically, ...no.

[KillerDynoSoar]

Hey Gost,

Wow man that would be really VERY kind of you indeed. Send me a mail to Dyno_Soar@hotmail.com and we can speak about the best option forward.

Just a couple of questions.. can you weld Stainless pipes into and out of this muffler? Or would it be better just to use the same ali coated pipes??

I guess we will be running identical set ups.

[gost]

Got the muffler on the car already. That was quick. It's installed so that I could remove it with 4 bolts and pop the muffler bypass or the original exhaust back in. I timed myself, 7 minutes off and 8 minutes on. A beautiful thing. Here are some pics!


It sounds great as well. Toned down the note alot. Has an idle like a V8, nice rumble and then gets deep and throaty from there on up to 3K RPM and then after that it gets rowdy and nice. I tend to think that if the stock Cat was in it would be a tad louder and perhaps have a higher pitch. Next comes the Wong Chip to tie it all together.

[jpahemi]

Is that Dave Hammer's license plate frame??
j.p.