Installed Fabspeed bypass combo

[eskimo]

isn't the euro-premuff basically a resonator itself? I don't remember or think that resonators have padding.. I think they just have air chambers.
a test pipe, and the bypass pipe.. now that would be loud.

[gost]

Yes it is. I thought you were talking about them making a mini cherry bomb type of muffler instead of the straight pipe off the rear, I missunderstood. Something to just cut the edge a little more.

[KillerDynoSoar]

Awesome gost! Nice little bracket. I am gonna have to think about adding something similar this weekend.

I thought the super trapp was something you could have just added to the tail pipe mouth (or opening) of the Fabspeed bypass??

Guys when you have this bypass system fitted you will LIVE at 4000rpm and above!

[KatoKato]

Gost,

Nice work! As you know I just switched out the cat. for a pre-muffler. The exhaust note is more pronounced now but man that bypass must be loud!

Perhaps I'll put one on when my muffler rots out.

Did that O2 sensor shield come with the pre-muff? Just wondering as mine wasn't there when I did the work. The 'shield' part had fallen off.

Kato

[gost]

Thanks Killer. One could also tack weld the reinforcing plates to the pan so they don't move, might be overkill, I just like welding metal. PM me if you have any questions when you do yours, I have dimensions and such that may save you some time. I am not familiar with the Supertrapp stuff at all. Your other post was talking about Flowmaster mufflers wasn't it? Are they the same company perhaps. I had a friend who had a Supertrapp on his enduro bike and it was awesome and adjustible by removing discs within the muffler. Great piece it was. If they make something to replace the Fabspeed muffler bypass based on that design and theory then I've got to see and hear it.
Kato...No the shield came off my original sensor. It's stainless and cleaned up like new with steel wool. Someone must sell it out there. The muffler bypass is not that loud to me, again I think it's Fab-U-lous.
Sound is each to his own.
I contacted Steve Wong about a chip and I know a few of you were interested in his comments. Here they are:
Thank you for your interest. The only chips I supply for the 84-86 Carrera
now are the 4k chips. If your DME is not already 4k enabled, it will
require you to perform the conversion by moving the jumper, or the car won't
start. The 4k software, as used by Porsche after 87, provides the car with
much superior throttle response that the cruder early 2k software is
incapable of. In addition, the sub 4k lag of the stock programming is
eliminated, power begins as early as 2000 rpm. The chip you'd require for
your setup, would be the chip for the sport muffler/premuffler setup,
designed to work with either the stock muffler or a sport muffler, as
additional fuel is provided if an owner does perform additional minor
exhaust/intake modifications. The chip should also work with the muffler
bypass you are using, however other than custom programming, I have not
specially programmed for a muffler bypass, as you are probably only the
second person who has inquired over the years about using such a setup -
must be very loud I'd imagine. Primarily the differences in the programming
of the sport muffler/premuffler chip is the remapping of additional fuel
expecially in the low/mid range part thottle region that without, can lead
to excessive exhaust popping and backfiring from lean mixtures of a freer
flowing exhaust. The top end fueling is also increased for the additional
flow from the exhaust mods. You are welcome to try the chip, and return it
if it doesn't work out for you for any reason. If you have any other
questions, or if I can be of further assistance, feel free to ask me.

Best regards,
Steve Wong

Nice offer, how can you go wrong. I am surprised no one has asked about a chip to accomodate a cat and muffler bypass combo especially for track use. I'll give him a buzz on the phone and chat a bit. If new news arises I will post it.

[KillerDynoSoar]

I was that other guy who asked about the chip.

Hmmn I think I need a Supertrapp.. I was hoping to get just the end piece to add to the end of the Fabspeed bypass exhaust tip. I wonder if that would be even possible??
I know they sell the end part (important part) of the Supertrapp but fitting it to the end of the slash cut fabspeed exhaust tip maybe a problem. Also I am not having any luck with suppliers of Supertrapp's here in the UK.

[gost]

Killer check out your " 3.2 with no back box " post. I just posted some info.

[aigel]

I wold have bolted it to the body before I would use the engine tin. The engine tin is not very sturdy, since all it is there for is to funnel air. If anything sags, it may take the tin right with it?

George

[gost]

The whole section moves with the torque twist of the engine george so there won't be much force on the tin at all. This is just to alleviate a very small amount of weight at the end of the cat and reduce the leverage which this did nicely. I also did add the reinforcing plates above and below the pan to spread any load that may be encountered and used large washers as well. It's rock solid and won't be under any unreasonable forces. There really is no other spot to do this and I don't want to put a muffler clamp on the end of tail pipe which would look like crap, I did a mock up of this and it did look like crap with the clamp in open view from behind. This is crisp and clean. It will be just fine, I'm positive of this but will let everyone know if it does show signs of strain. I will be adding a muffler in a few weeks so it won't be needed anyway unless I go back to this arrangement for fun sounds. It will be easy to do!
Thanks for your concern George.

Gordon

[gost]

I thought I would post a few pics of the Flowmaster Series 80 # 52580 muffler I just installed. I painted it black after it was installed. To remove and install the muffler bypass takes 10 minutes. A beautiful thing.

[glh]

Gost,
Let me know how you like your muffler.
I have installed a cat bypass by my mech was concerned about the muffler BP not creating enough backpressure to keep the valves cool, as you guys discussed here.
So for now the Muffler BP is still in the box in the garage.

Thanks for your information.

GLH

[gost]

GLH, You will be fine using your muffler BP. It sounds just amazing. Your cat BP is like the Euro pre-muffler yes or is it just a straight thru pipe? Straight thru and it will sound like a tank, pre-muff it sounds sweet. You don't need backpressure on these engines contrary to other motors. Steve W of 911chips.com told me this. I just put his chip in as well. I put the muffler on to just tone down the note a tad as it is very aggressive with the muffler BP, I love it don't get me wrong but I now have options and it was cheap enough to throw on the muffler. The key is the ease with wich I can exchange components. Mine is set up so I can easily have any combination of stock cat and muffler and fabspeed stuff and flow master muffler...any combination, it's awesome and only takes about 15 minutes to swap everything out. The muffler sounds great, deep, throaty, aggressive and a great wail on WOT! I'm very very pleased!
Hope this helps and good luck

[glh]

Originally posted by gost
...Your cat BP is like the Euro pre-muffler yes or is it just a straight thru pipe?...

I don't know which but it looks exactlly like yours in your pictures on post one.
When I looked in it it looked wide open with small perforations along the interior wall of the pipe with some kind of insulation where the pipe is flaired out. Let me know which one you think I have. Fabspeed did call it the cat BP pipe.

I have been having slight muffled backfires since the install when shifting up from over 6000rpm to the next gear. Look pretty wild at night with a bleu flame coming out of the muffler.

The car is a 1984 Carrera currently running with the cat BP and a stock muffler. Picked up serious power just with the cat BP pipe but I am really apprentious of running lean and frying valves. I blew one of the engines on my boat last year running lean and it cost the price of the Porsche to re-built... So you can understand I am somewhat gun-shy.

Here's a pick of the car... and the boat for that matter...

[midlife]

Wow! That muffler must really improve low end pulling power.


Nice boat BTW.

[glh]

Originally posted by midlife
Wow! That muffler must really improve low end pulling power.

[glh]

Gost,
Checked and I do have the Euro-Premuffler Catbypass as far as I know.

[gost]

GLH yup if it's from Fabspeed then it's the same one I have with the perforations in it. That bypass flows better than the stock cat but believe it or not it's actually quieter. I ran the muffler BP on both so I know. If you are concerned about runing lean what you can do is locate your DME under the drivers seat and on the rear end (facing the engine, make sure the seat is all the way forward) you will see this black round plug. In the center of that plug is an push through opening for a Y type shaped screw driver, or you can use the corect size flat blade, you have to do trials to get the right one. Behind this opening is a fuel delivery adjustment switch which is set from the factory to one side of the stop. You can adjust this switch I believe clockwise to 4 or five other settings that either richen or lean the fuel ratio. One click from stock is + 4% richer 2 clicks is 8% richer and they also advance timing by like 6 degrees. 3rd click I believe runs it 3% leaner and 4th yada yada. So you want to turn yours by only 1 or 2 clicks and then you can chuck your worries out the porthole. Little known fact that you can do this on the DME. I ran mine 1 click off stock when I had both the cat and muffler BP's on and did feel a difference and the Poping was amazing. If you ever plan on putting a Steve Wong chip in you might as well disconnect and open up your DME for practice, it's easy and then you can really see that fuel adjustment switch I'm talking about. The istructions on how to remove and open it up are on Steve's website at 911chips.com Post again if you have more questions.
Awesome ship you have there. Is it a Cigarette? I went for a ride last summer in an acquaintences 42 foot Fountain which had twin 454 supercharged big blocks that took the hair off of my scalp. I never imagined how fast those ships are. We hit 120MPH in no time and my heart stopped beating and I saw my self from above and began walking towards that white light everyone mentions seeing. He said he gets about 2 miles to the gallon running hard. I was in a zone the rest of the day.

Safe motoring...and sailing