Decat Pipe Question - LotusTalk

Imolas54 · 08-11-2007, 05:54 AM

can i install the decat without either of the o2 sensors? I don't care about the CEL, but want to make sure the car will still run good.

Baysailor · 08-11-2007, 06:44 AM

It will need the first O2 sesnsor installed, this is what the ECU uses to monitor the combustion process and adjusts the fuel/air ratios accordingly. The second O2 is just used to monitor cat efficiency and could be left out (triggering the MIL/CEL of course). Now being that this is a decat you are talking about, the primary O2 sensor could be installed in either bung to get its readings (I saw on the other thread that one of the bungs was damaged).

Imolas54 · 08-11-2007, 08:30 AM

it's that my used decat pipe has both of the o2 bungs threads totally stripped and unusable...so i was thinking of just threading a larger size bolt into it

Thomasio · 08-11-2007, 08:58 AM

Can the bungs be re-tapped, or use thread inserts to repair them?

T.

Baysailor · 08-11-2007, 09:19 AM

That sucks that it is both... you can take it to an exhaust shop and get them to weld in new bungs, but this is probably a stainless decat and I am not sure if they will have stainless bungs. I would just use Helicoils. I think it is a 18/1.5 thread (same as spark plug). Helicoils work great and you should be able to get a great fix using them (particularly if the stripped bungs are stainless).

Baysailor · 08-11-2007, 09:30 AM

I just measured the threads to make sure I was correct. The threads are 18/1.5 which is a common spark plug size, so most any auto parts store should have a spark plug rethread kit in that size. I prefer the Helicoil, but most any should do.

Baysailor · 08-11-2007, 09:43 AM

Actually, what am I saying??? This is a very hard thing to fix and will cost lots of money...

instead you should just ship it to me so you don't have to deal with it anymore!!!

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I have been trying to find one for a while now since Sector111 has been out of them for so long!

Imolas54 · 08-11-2007, 12:28 PM

lol, the problem is that it was so badly crossthreaded that there is no "meat" left after i retapped it. Getting two new bungs and an exhaust shop to weld... i might as well have brought a new unit...

OH wells...

Baysailor · 08-11-2007, 12:34 PM

Did you just try to re-tap them (I could see where that wouldn't work), or did you drill and re-tap for one of the threaded inserts?

Imolas54 · 08-12-2007, 05:25 PM

alright took it to an exhaust shop had them fix it all up, the welds around the bung was cracked too..... costed me $100... now i've paid for a repaired de-cat pipe that cost more than new....

08-11-2007, 05:54 AM	#1 (permalink)
Imolas54 ToYoTa dRiVeR Join Date: Jul 2006 Location: Long Island, NY Posts: 1,432	Decat Pipe Question can i install the decat without either of the o2 sensors? I don't care about the CEL, but want to make sure the car will still run good. __________________ It's Never Enough...

08-11-2007, 06:44 AM	#2 (permalink)
Baysailor Registered User Join Date: Jul 2005 Location: Richmond, VA Posts: 1,205	It will need the first O2 sesnsor installed, this is what the ECU uses to monitor the combustion process and adjusts the fuel/air ratios accordingly. The second O2 is just used to monitor cat efficiency and could be left out (triggering the MIL/CEL of course). Now being that this is a decat you are talking about, the primary O2 sensor could be installed in either bung to get its readings (I saw on the other thread that one of the bungs was damaged). __________________ 2006 Lotus Elise - Solar Yellow, HT, LSS, LSD/TC, Touring, StarShield, S111 RTDbrace, S111 microMirror, S111 Carpet Buttons, Painted A/C Surround, CF Center Console, Nitron S/A, Tempest BAB26-12 AGM Battery, Fujita Intake, Top Speed Pro 1 Exhaust, 4Tress Harness Bar, 6000k 35w HID kit, Moroso Oil Pan, Plinthless front clam, Team Dynamics Pro Race 1.2 Wheels w/ RE01-R's for street use, Heater Core By-Pass, Shifter Reinforcement, LETSLA v2 Shift Kit Last edited by Baysailor : 08-11-2007 at 06:52 AM.

08-11-2007, 08:30 AM	#3 (permalink)
Imolas54 ToYoTa dRiVeR Join Date: Jul 2006 Location: Long Island, NY Posts: 1,432	it's that my used decat pipe has both of the o2 bungs threads totally stripped and unusable...so i was thinking of just threading a larger size bolt into it __________________ It's Never Enough...

08-11-2007, 08:58 AM	#4 (permalink)
Thomasio really light stuff Join Date: Jul 2003 Posts: 3,503	Can the bungs be re-tapped, or use thread inserts to repair them? T. __________________ 07 SY Exige S Really Light Stuff Intercooler . RLS Tubes . RLS Water/Methanol Injection . RLS 3.0" Pulley . RLS Wing Plates . RLS CF Window Panel

08-11-2007, 09:19 AM	#5 (permalink)
Baysailor Registered User Join Date: Jul 2005 Location: Richmond, VA Posts: 1,205	That sucks that it is both... you can take it to an exhaust shop and get them to weld in new bungs, but this is probably a stainless decat and I am not sure if they will have stainless bungs. I would just use Helicoils. I think it is a 18/1.5 thread (same as spark plug). Helicoils work great and you should be able to get a great fix using them (particularly if the stripped bungs are stainless). __________________ 2006 Lotus Elise - Solar Yellow, HT, LSS, LSD/TC, Touring, StarShield, S111 RTDbrace, S111 microMirror, S111 Carpet Buttons, Painted A/C Surround, CF Center Console, Nitron S/A, Tempest BAB26-12 AGM Battery, Fujita Intake, Top Speed Pro 1 Exhaust, 4Tress Harness Bar, 6000k 35w HID kit, Moroso Oil Pan, Plinthless front clam, Team Dynamics Pro Race 1.2 Wheels w/ RE01-R's for street use, Heater Core By-Pass, Shifter Reinforcement, LETSLA v2 Shift Kit

08-11-2007, 09:30 AM	#6 (permalink)
Baysailor Registered User Join Date: Jul 2005 Location: Richmond, VA Posts: 1,205	I just measured the threads to make sure I was correct. The threads are 18/1.5 which is a common spark plug size, so most any auto parts store should have a spark plug rethread kit in that size. I prefer the Helicoil, but most any should do. __________________ 2006 Lotus Elise - Solar Yellow, HT, LSS, LSD/TC, Touring, StarShield, S111 RTDbrace, S111 microMirror, S111 Carpet Buttons, Painted A/C Surround, CF Center Console, Nitron S/A, Tempest BAB26-12 AGM Battery, Fujita Intake, Top Speed Pro 1 Exhaust, 4Tress Harness Bar, 6000k 35w HID kit, Moroso Oil Pan, Plinthless front clam, Team Dynamics Pro Race 1.2 Wheels w/ RE01-R's for street use, Heater Core By-Pass, Shifter Reinforcement, LETSLA v2 Shift Kit

08-11-2007, 09:43 AM	#7 (permalink)
Baysailor Registered User Join Date: Jul 2005 Location: Richmond, VA Posts: 1,205	Actually, what am I saying??? This is a very hard thing to fix and will cost lots of money... instead you should just ship it to me so you don't have to deal with it anymore!!! . . . . . . . . . I have been trying to find one for a while now since Sector111 has been out of them for so long! __________________ 2006 Lotus Elise - Solar Yellow, HT, LSS, LSD/TC, Touring, StarShield, S111 RTDbrace, S111 microMirror, S111 Carpet Buttons, Painted A/C Surround, CF Center Console, Nitron S/A, Tempest BAB26-12 AGM Battery, Fujita Intake, Top Speed Pro 1 Exhaust, 4Tress Harness Bar, 6000k 35w HID kit, Moroso Oil Pan, Plinthless front clam, Team Dynamics Pro Race 1.2 Wheels w/ RE01-R's for street use, Heater Core By-Pass, Shifter Reinforcement, LETSLA v2 Shift Kit

08-11-2007, 12:28 PM	#8 (permalink)
Imolas54 ToYoTa dRiVeR Join Date: Jul 2006 Location: Long Island, NY Posts: 1,432	lol, the problem is that it was so badly crossthreaded that there is no "meat" left after i retapped it. Getting two new bungs and an exhaust shop to weld... i might as well have brought a new unit... OH wells... __________________ It's Never Enough...

08-11-2007, 12:34 PM	#9 (permalink)
Baysailor Registered User Join Date: Jul 2005 Location: Richmond, VA Posts: 1,205	Did you just try to re-tap them (I could see where that wouldn't work), or did you drill and re-tap for one of the threaded inserts? __________________ 2006 Lotus Elise - Solar Yellow, HT, LSS, LSD/TC, Touring, StarShield, S111 RTDbrace, S111 microMirror, S111 Carpet Buttons, Painted A/C Surround, CF Center Console, Nitron S/A, Tempest BAB26-12 AGM Battery, Fujita Intake, Top Speed Pro 1 Exhaust, 4Tress Harness Bar, 6000k 35w HID kit, Moroso Oil Pan, Plinthless front clam, Team Dynamics Pro Race 1.2 Wheels w/ RE01-R's for street use, Heater Core By-Pass, Shifter Reinforcement, LETSLA v2 Shift Kit

08-12-2007, 05:25 PM	#10 (permalink)
Imolas54 ToYoTa dRiVeR Join Date: Jul 2006 Location: Long Island, NY Posts: 1,432	alright took it to an exhaust shop had them fix it all up, the welds around the bung was cracked too..... costed me $100... now i've paid for a repaired de-cat pipe that cost more than new.... __________________ It's Never Enough...

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