| Author |
Message |
Mitchel DeFrancis (4re308)
| | Posted on Thursday, August 02, 2001 - 2:47 pm: | |
I put Nick Sciannas test pipe on my QV and it made a nice difference. I did notice a small "seat of pants" increase in power and a HUGE increased throttle response. The sound is fantastic! I have also noticed that the smell of running without the cats is not as bad as I thought it would be. I have my K&N coming form Nick this week!! JOY!
Hey Scott, did the K&N make any difference? |
david handa (Davehanda)
| | Posted on Thursday, August 02, 2001 - 2:10 pm: | |
I removed both my cats and the power increase was very little. The sound is definitely a bit louder and deeper with the stock exhaust. This was on a 78 308 GTS carb car. Many reasons to remove the cats. If you have an ignition failure, unburnt gas will collect in the cat and catch fire. An internally collapsed cat can also cause engine damage. This happens a lot on old 308's, or so I'm told. |
John Cortina (Johncort)
| | Posted on Thursday, August 02, 2001 - 2:00 pm: | |
John
I also have an 86 328 and I replaced my cat with a "test pipe". It certainly helped with the sound but it is very difficult assessing the HP gained.
John C. |
Warren E. Smith (Magoo)
| | Posted on Thursday, August 02, 2001 - 9:22 am: | |
John, It is condensation. |
John A Arends (Jarends)
| | Posted on Thursday, August 02, 2001 - 7:27 am: | |
This is an interesting conversation, I have an 86 328 GTS, I have with it a pipe that replaces the converter, you are all calling it a test pipe. I'm playing with the idea of installing it a keeping the cat on the side for inspection, etc. I hope this will increase hp as well as the sound, I've been told it will do both.
The other question regarding some smoke from the left pipe? I see some, especially in the winter, that appears to be vapor. It disapates immediately and stops altogether after a few minuts and the engine heats up. I assumed it was normal water condensation from the cat.
John |
Herbert Edward Gault (Irfgt)
| | Posted on Thursday, August 02, 2001 - 4:03 am: | |
One of my converters had broken up inside and clogged so I gutted them and reinstalled them. Never will have to worry about that again. |
Scott Gold (Scotttgold)
| | Posted on Wednesday, August 01, 2001 - 10:22 pm: | |
So do you guys still have cat converters on your cars or did you take them off? |
Warren E. Smith (Magoo)
| | Posted on Wednesday, August 01, 2001 - 11:27 am: | |
Herb is correct. What I found on my cats is a perforated piece in the end of the cat to prevent large particles from getting into the muffler. However the cat can come apart and clog itself as Herb says and cause restricted exhaust flow. |
Low Kai Chin (Speeddemon)
| | Posted on Wednesday, August 01, 2001 - 11:26 am: | |
i cut open my factory exhaust and looking at the insides, the chances of a clog seems slim! As my is a Euro 308 QV, I got the exhaust shop to refill the insides with Yoshimura ceramic absorber. The stainless exhaust will not rust anyway. |
Mark (Mnmark)
| | Posted on Wednesday, August 01, 2001 - 10:43 am: | |
My understanding is that the substrate in the cats can and does come loose and may plug the muffler. According to my understanding, esp in the early '80's 308's. One reason for "test pipes" is to test the flow through the muffler, bypassing the cats. If there is then a big improvement, bad cats. If no change, still could bad muffler? But with the cats off, you can just look in them, and see if the substrate is in there or not. My 82 308 has same problem, left side and all. No, I bought a new ignition instead. |
Herbert Edward Gault (Irfgt)
| | Posted on Wednesday, August 01, 2001 - 4:19 am: | |
It is pretty normal for the exhaust to be uneven coming out the muffler and the odds are slim that the muffler could ever become clogged. A much more likely occurance is for the converters to become restricted, as the substrait can break loose internally and block itself. A glowing hot exhaust manifold either on the right or left side is a tip off that one of the converters is bad. The smoke is coming from either a too rich fuel condition or valve seals leaking oil into the cylinders. Any good exhaust shop can retrofit a universal converter to your car as the flanges are available fron NAPA and you just weld them on using the original converter as a guide. |
Stewart Chung (Navygakman)
| | Posted on Tuesday, July 31, 2001 - 10:28 pm: | |
Nick Scianna was checking out my car and he noticed the same thing, he felt that there should be much more pressure coming out of there.
Just the excuse I need to get a Tubi.
:-) |
Scott Gold (Scotttgold)
| | Posted on Tuesday, July 31, 2001 - 9:44 pm: | |
First of all thanks to all who posted back on my other questions, it helped a lot and made me more confident before I started fiddling around.
I put in a K&N filter, changed the oil and got new tires. I can't tell you the differance the new tires make, the tire guy said they were so dry rotted that they could have shredded at any moment, I guess you could expect that from THE ORIGINAL(1982) tires that were on it!
Well, my new question is, it seems that my left side exhaust is clogged. If I put my hand a couple inches away from the right exhaust I can feel the exhaust coming out quite well, but on the left side I can't feel much at all, sometimes a little lite smoke will even come out of the left also. So whats up with that, can a muffler be clogged? If any one can relate please drop me a line,
Thanks,
Scott 1982 308GTSi |
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