| Author |
Message |
Brian stewart (Eurocardoc)
| | Posted on Friday, November 23, 2001 - 3:59 pm: | |
Just a quickie on this guys-
it IS illegal to interfere with the emmissions (see $10K!!!) and it may affect resale. Most states require retail dealers to ensure that the cars are properly equipped. Keep the old parts, of course nobody can see through the cat without removing, but test pipes are easily spotted. |
'75 308 GT4 (Peter)
| | Posted on Friday, November 23, 2001 - 1:58 pm: | |
Krister, I know how to attach photos, but I should've read further in the Formating tips to see right below the "\image" instructions, there is the "\attach" function. Thanks! |
Krister Ripstrand (Krister)
| | Posted on Friday, November 23, 2001 - 6:38 am: | |
Peter - You can attach anything with an attach-command (se formatting), which we can download, in this case to play the *.waw (e.g.) by our speakers. |
'75 308 GT4 (Peter)
| | Posted on Friday, November 23, 2001 - 3:07 am: | |
My car uses the doughnut-type of gasket that you use Magoo. Hard to say about the sound though, my car is loud and there is a whole hell of a lot of noise back there (I don't complain because I like it). If I could only hear your car to see what you mean (Rob, isn't there a way you can develop something so we could post sound bytes here, just like we do with our pictures?). |
Dirk Rabenschwanz (Dirk)
| | Posted on Friday, November 23, 2001 - 1:42 am: | |
I dont like the sound at low revs without cat.
But the sound at high revs is great.
Best would be, original sound at low revs and
free flow sound at high revs.
Dirk |
magoo (Magoo)
| | Posted on Thursday, November 22, 2001 - 7:17 pm: | |
Sorry that word should be grumble not crumble. |
magoo (Magoo)
| | Posted on Thursday, November 22, 2001 - 7:16 pm: | |
No Peter, This is the rumble, crumble of the exhaust on decelleration. No exhaust leaks spitting by. I call it back off but it seems more so on the 308s. Don't you have it at times? To answer your question the gaskets are donut type. |
Doug Meredith (Doug308)
| | Posted on Thursday, November 22, 2001 - 4:01 pm: | |
Bill,
mine was actually an '84 QV that I no longer have. No carbs, but original muffler. I'm sure a free flow muffler combined with the test pipes would have given a little more increase. |
Bill Sebestyen (Bill308)
| | Posted on Thursday, November 22, 2001 - 8:37 am: | |
Doug,
I suspect your results are pretty typical. If the cats are working properly, they shouldn't cost you much hp or torque. With them now removed however, gain in hp or torque may be obtained by rejetting the carbs. If hp is your aim, you may want to try one step richer on the mains, or 1-3 steps smaller on the air correctors. A richer main system may give you measurable increases in hp and torque, but with increased fuel consumption and fumes. There is always a price to pay. Bill |
Doug Meredith (Doug308)
| | Posted on Thursday, November 22, 2001 - 5:15 am: | |
I was the first to use Nick's test pipe on my 308. He actually used my cat as the template. The switch was easy with no side effects except for a stronger smell from the exhaust. There was also a more "throaty" sound between 1500-3500 rpm. I did dyno runs with and witout. There was a slight increase in power (1 hp & 1.8 ft.lbs) sans cat. The curves on the dynos were identical. FWIW |
'75 308 GT4 (Peter)
| | Posted on Thursday, November 22, 2001 - 3:06 am: | |
Magoo, you mean a loud banging, popping sound? Just means you have a poorly fitting flange gasket where the Cat hooks up to (air leaking by). Does the Cat use a flat gasket or is it one of those doughnut types? |
magoo (Magoo)
| | Posted on Wednesday, November 21, 2001 - 10:36 pm: | |
After removing the cats on a 308, How many of you have experienced a annoying back off in the muffler on decelleration? Nature of the beast? I would say it is something we have to live with especially on the carb. models. What do you think. Comments? |
Mitchel DeFrancis (4re308)
| | Posted on Monday, November 19, 2001 - 1:25 pm: | |
I agree with Franks post. I have had K&Ns on all my cars, and have never had a problem. I just clean them every couple a months a be done with it. I only noticed a slight increase of throttle response and MUCH better breathing at higher RPMs.
The test pipe made a really nice improvement. LOVE THAT SOUND!! |
Frank Parker (Parkerfe)
| | Posted on Monday, November 19, 2001 - 12:11 pm: | |
I've had test pipes on my 328, TR and now 348 with no problems whatsoever. As far as K&N Filters are concerns I also use them on all of my cars and motorcyles. I think they give a little more intake sound on the cars. Regardless of any power increase they are better filters than the stock ones which justify their use. |
Dirk Rabenschwanz (Dirk)
| | Posted on Saturday, November 17, 2001 - 7:26 am: | |
I have also installed a cat bypass on my 84 QV.
There was also a mounting for the oxygen sensor.
But my car didnt run smooth on revs between 2000-
3000RPM. The reason for this was that the sensor didnt reach his working temperature at 600 degrees, so that the ECU couldnt control the
engine in the right way. When i installed the
cat with the sensor everything was ok.
So i wonder about these guys which install
test pipes without problems on FI-ECU-Cars.
I think the ignition timing is also a reason for problems when installing these pipes on FI-ECU cars.
What i will try is to remove the valve, which controls the fuel mixture and adjust the mixture on the fuel distributor.
Dirk |
Modified348ts (Modman)
| | Posted on Saturday, November 17, 2001 - 1:35 am: | |
The K&N filter or any filter upgrades won't make much difference worth doing, test pipes are good for breathing and upper end but say good bye to low end torque- tubi is your best bet for overall performance. If your cats are bad, just pound the inner ceramics and steel wool out and viola! test pipe which would also pass for visual. I have done tests with test pipes and honed factory cats and the power is the same and so is 1/4 mile times. Again, don't waste time on the filter and to expect more power, it's just a mind trip. Improving the air flow to the throttle body and or filter is gonna do you better.. |
Edward Gault (Irfgt)
| | Posted on Friday, November 16, 2001 - 8:04 am: | |
Why not just take your stock air filter out and drive around the block and see if it makes any difference.This would be the maximum power you could expect to gain. The results will not be perceptible other than the sound will be louder from the air going through the intake. |
John A Arends (Jarends)
| | Posted on Friday, November 16, 2001 - 7:18 am: | |
Mitchel, just noticed your post. I've heard alot of talk regarding the K&N filters. Some say it makes a difference, some don't.
What's the bottom line, is it worth going for one? John |
John A Arends (Jarends)
| | Posted on Friday, November 16, 2001 - 7:15 am: | |
I just installed a test pipe in our 328, That old exhaust smell from the 50-60s is back, but I love it. Sound is a little nicer and I was told there would be a small performance increase. havn't been able to check that out. I haven't checked if the trunk is cooler, but I will.
John |
Mitchel DeFrancis (4re308)
| | Posted on Friday, November 16, 2001 - 6:48 am: | |
Mark,
I too have one of Nicky's test pipes on my 84 308 QV. I actually love it. The sound is fantastic, the car runs cooler, the trunk is cooler, the throttle response is better and I can notice some seat of pants improvements, especially at higher RPMS. I also put a K&N filter on it, and she really breathes nicely. Nicks piece is very nicely made. I only had one big catalytic. Only the 83s had 2 small cats, hence why you need 2 small test pipes on the 83 QV. I recommend it.
Mitchel |
Bill Sebestyen (Bill308)
| | Posted on Thursday, November 15, 2001 - 6:07 pm: | |
If your trunk area is unacceptably hot, you may want to consider a radiation or insulation shield on the cat side of the trunk wall. Bill |
Charles Gault (Knox_Charles)
| | Posted on Thursday, November 15, 2001 - 4:17 pm: | |
I installed Nick's test pipe on my 328. It had a single Cat. I agree that it is a nicely done piece. It did seem to reduce the temp (not measured). A Cat does get a lot hotter than a regular pipe. |
BretM (Bretm)
| | Posted on Thursday, November 15, 2001 - 4:09 pm: | |
My 85 never got hot back there for some reason, it only has one cat.
I just bought Nick's test pipe, it's a nice piece, good welds. I'm gonna put it in over the winter. |
Mark C. Gordon (Markg)
| | Posted on Thursday, November 15, 2001 - 3:53 pm: | |
For those who have replaced their cat converters with 'test' pipes, was there a noticiable difference in heat in the rear trunk (308 series)? The Cats seem to lie below this area, and it gets very hot in there! Thanks |