| Author |
Message |
Henryk (Henryk)
Member
Username: Henryk
Post Number: 371
Registered: 8-2001
| | Posted on Tuesday, December 17, 2002 - 10:29 pm: | |
I feel the purpose of the test pipes is only to initially set the air-fuel mixture screw, at the factory....just before they install the "no-tamper" plug into the fuel distributor. Since I don't show my car in "strict" concourses, then I really don't see why I would want to replace them.....I, also, rather spend $250 somewhere else. I will be considering installing pipes to eliminate the cats and pre-cats, and possibly removing the air pump, etc., also. It would make the engine look much cleaner.
The price of a used TR, with miles, has gotten to the point were spending money, to keep it in concourse condition, seems pointless. I feel the above changes wouldn't make a difference in price anyway.
I do appreciate the input.
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Ben Lobenstein 90 TR (Benjet)
Member
Username: Benjet
Post Number: 944
Registered: 1-2001
| | Posted on Tuesday, December 17, 2002 - 6:34 pm: | |
My test pipes became bent and broken when we dropped out the entire exhuast. So I removed the plugs/pipes from the pre-cats (not nearly as hard as I was expecting it to be), snipped off the tubes, and had the plugs welded shut outside of the pre-cats (then reseated the plugs into the pre-cats). As the stock exhuast doesn't stay in my car too long, and my current system is fully capable of having the same tests done at the tailpipes, what purpose would keeping the pipes in place be?
I should also add 2 things for "concourse" I can re mount the tubes in their places so it looks ad tho they are connected (but would have to swap back in the stock exhuast to do that), altho this is only "for show". When I last checked (2 years ago?) all 4 tubes were available from Ferrari at ~$60/each, almost bought a set just to have since I destroyed the ones that were on the car, but just couldn't convince myself that I would NEED them ($250 best spent elsewhere).
-Ben |
Jeff Green (Carguy)
Junior Member
Username: Carguy
Post Number: 92
Registered: 10-2002
| | Posted on Tuesday, December 17, 2002 - 3:55 pm: | |
Hey Henryk; I've removed the entire exhaust from my TR and am going to make a system like Bill Badurski has on his car. It consists of aftermarket Corvette resonator type mufflers, which are very short, and then simply running pipes directly to the factory exhaust headers. He has posted pictures in another thread "straight pipes on a TR?" so check them out if your interested. The cost will be minimal, so if I'm not happy with the sound, I will have a friend of mine fab some pipes to replace the precats & cats, and put the stock muffler back on. But I'm looking forward to trying it, and doing this removes about 70 pounds from the car, which can't hurt! Let me know if you have questions. Jeff |
Steve Magnusson (91tr)
Intermediate Member
Username: 91tr
Post Number: 1242
Registered: 1-2001
| | Posted on Tuesday, December 17, 2002 - 9:14 am: | |
Wouldn't be my choice Henry (esp. since they're in a visible underbonnet location), but to each his own. I'd agree that just getting the original flare nuts out now will probably be a rather serious project (compared to welding the existing tube stub closed), but the condition of your remaining bits will only get worse in the future IMO -- I had to remove the precats so I could drill out a couple of the flare nuts and clean/chase the threads on the female fitting). You might want to start trying to get a replacement set of sampling tubes now (when I last sourced these a couple of them weren't available so I had to hassle with sending my old bits to Classic Tube for reproductions -- I would have been a lot happier to pay the ~$50/tube to a F part supplier than the time/aggrevation of working with/proding CT). |
Henryk (Henryk)
Member
Username: Henryk
Post Number: 370
Registered: 8-2001
| | Posted on Monday, December 16, 2002 - 11:53 pm: | |
Steve: I see your point. However, I feel that the nut and tube are integral parts. Therefore, my plan is just to weld the tube shut, and not the nut. Hence, I would avoid any extra bolts. The nut would still be able to be removed.
Since this is already "rusted" through, I don't see that welding the tubes shut should cause a problem.
If I would ever want to test it, I would need new tubes anyway, thus I could unscrew the nut, even with it welded.
Being that the car is an 88, with fuel injection, I can't see were there would be a realistic need for testing. |
Steve Magnusson (91tr)
Intermediate Member
Username: 91tr
Post Number: 1241
Registered: 1-2001
| | Posted on Monday, December 16, 2002 - 11:11 pm: | |
Henry -- You should get the system sealed, but don't weld things shut (as you noted, those are the only from-the-top-accessible exh. sampling ports upstream of the pre-cats/cats) -- see this thread:
http://server.ferrarichat.com/~ferrari/ferrarichat.com/discus/messages/112/73413.html
for the parts (110860 + Cu washer) you need (it's the same plug used on the exh. sampling ports near the cylinder heads). My experience is that the only way to prevent those sampling tubes from becoming embrittled and breaking is to remove them from the car for normal operation (i.e., replace them with the 110860 "CO Plug") and only install the sampling tubes when needed for mixture adjustment (same for a 308 too).
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Henryk (Henryk)
Member
Username: Henryk
Post Number: 369
Registered: 8-2001
| | Posted on Monday, December 16, 2002 - 10:53 pm: | |
While examining my TR, I noticed that several (3 of 4) exhaust test pipes were broken off at the exhaust. Since these are BEFORE the catalylic converters, and thus, drawing in fresh air, I feel that the computer will sense this, and read a too high lean mixture, thus sending more fuel to the injectors.
My plan is to weld the holes shut, thus, preventing fresh air from entering.
Any comments? |
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