Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Performance and Technical chat

Reply
 
LinkBack Thread Tools Display Modes
Old 11-12-2019, 09:29 PM   #21
Who's askin'?
 
maytag's Avatar
 
Join Date: Mar 2018
Location: Utah
Posts: 2,380
Quote:
Originally Posted by P_Carfahrer View Post
Dan, this is exactly how I run my car. I lengthened my sensor wires in my harness with twisted pair wire (didnít mess with the actual sensor wires) and have never had a CEL for it. Passed emissions three times now.
Hey! Alright then: that's the easy button!
Good man! Thank you!

Sent from my SM-G970U using Tapatalk

maytag is offline   Reply With Quote
Old 01-11-2020, 06:13 PM   #22
Who's askin'?
 
maytag's Avatar
 
Join Date: Mar 2018
Location: Utah
Posts: 2,380
Quote:
Originally Posted by P_Carfahrer View Post
Dan, this is exactly how I run my car. I lengthened my sensor wires in my harness with twisted pair wire (didnít mess with the actual sensor wires) and have never had a CEL for it. Passed emissions three times now.
I think I'm going to build "extension cables". I have a spare harness.
Any reason not to? I assume I can solder these.... there's not a problem with added resistance, right?

Sent from my SM-G970U using Tapatalk
maytag is offline   Reply With Quote
Old 01-11-2020, 10:16 PM   #23
Registered User
 
Join Date: Jul 2019
Location: Finland
Posts: 181
Quote:
Originally Posted by P_Carfahrer View Post
Dan, this is exactly how I run my car. I lengthened my sensor wires in my harness with twisted pair wire (didnít mess with the actual sensor wires) and have never had a CEL for it. Passed emissions three times now.
This is what I am doing as well as encuraged by good esults from forum.
What size wire you used on this exension?
I do have all the connectors now and plan to do the extensions probably next weekend.
__________________
Boxter 2.7 2001 Manual
pilot4fn is offline   Reply With Quote
Old 01-12-2020, 07:35 AM   #24
Registered User
 
jsceash's Avatar
 
Join Date: Aug 2009
Posts: 1,462
Garage
Sort of late on this post, I have been running this same configuration in PA for 7 year No cells and inspection issues. Extended the wires on the second position cat's. I just cut the cable out of the original ones then soldered and shrink wrapped the splices. Then covered the wire in heat loom.
__________________
2003 Black 986. modified for Advanced level HPDE and open track days.
* 3.6L LN block, 06 heads, Carrillo H rods, IDP with 987 intake, Oil mods, LN IMS. * Spec II Clutch, 3.2L S Spec P-P FW. * D2 shocks, GT3 arms & and links, Spacers front and rear * Weight reduced, No carpet, AC deleted, Remote PS pump, PS pump deleted. Recaro Pole position seats, Brey crouse ext. 5 point harness, NHP sport exhaust
jsceash is offline   Reply With Quote
Old 01-12-2020, 05:12 PM   #25
Pathological Tinkerer
 
Join Date: Mar 2017
Location: Utah
Posts: 169
Catless wonder?

Soldering is fine and heat shrink. Make sure to slide the heat shrink on the wire before soldering both ends.
I used some harness heat tube I bought from DEI for the extensions.

I used twisted pair wire on the signal wires as the harness is also using twisted wire.

Signal wires are those marked I/J on the schematic.

Wire gauges are listed as 0.5mm or 1.0mm. You can use the closest larger aproxŪmate AWG size.

Schematic

1vK means 1 vor Katalysator or before Catalyzer.
1nK means 1 nach Katalysator after Catalyzer.

Last edited by P_Carfahrer; 01-12-2020 at 05:21 PM.
P_Carfahrer is offline   Reply With Quote
Old 01-13-2020, 11:28 AM   #26
Registered User
 
Join Date: Jul 2019
Location: Finland
Posts: 181
Fantastic, thank you P_Carfahrer
__________________
Boxter 2.7 2001 Manual
pilot4fn is offline   Reply With Quote
Old 01-13-2020, 11:43 AM   #27
Registered User
 
The Radium King's Avatar
 
Join Date: Apr 2010
Location: Canada
Posts: 2,987
so, do anyone you subscribe to the 'reference o2' stuff regarding continuity of the wire jacket?
The Radium King is offline   Reply With Quote
Old 01-13-2020, 02:16 PM   #28
Who's askin'?
 
maytag's Avatar
 
Join Date: Mar 2018
Location: Utah
Posts: 2,380
Quote:
Originally Posted by The Radium King View Post
so, do anyone you subscribe to the 'reference o2' stuff regarding continuity of the wire jacket?
I don't. I think that's a lot of voodoo, personally.

I know over the years and different models of cars I've sure had plenty of scabbed-together o2 sensors, with torn jacket, or NO jacket, and they seemed to be just fine.

I think we see things like this pop-up from people my age who perpetuate mystery surrounding things they don't understand. My generation was much happier with carburetors and cherry-bombs.
maytag is offline   Reply With Quote
Old 01-13-2020, 02:40 PM   #29
Registered User
 
The Radium King's Avatar
 
Join Date: Apr 2010
Location: Canada
Posts: 2,987
totally agree; the thread seemed to be going too smooth, however, so thought i'd throw some sand in the vaseline.

how about those who say that the post-cat o2 sensors are used to fine-tune fuel trims?
The Radium King is offline   Reply With Quote
Old 01-14-2020, 03:06 AM   #30
edc
550 Anniversary
 
edc's Avatar
 
Join Date: Jul 2012
Location: Surrey, UK
Posts: 709
Garage
Quote:
Originally Posted by The Radium King View Post
totally agree; the thread seemed to be going too smooth, however, so thought i'd throw some sand in the vaseline.

how about those who say that the post-cat o2 sensors are used to fine-tune fuel trims?
In the UK you can program these out to no I'll effect.
edc is offline   Reply With Quote
Old 01-14-2020, 05:47 AM   #31
Registered User
 
The Radium King's Avatar
 
Join Date: Apr 2010
Location: Canada
Posts: 2,987
Quote:
Originally Posted by edc View Post
In the UK you can program these out to no I'll effect.
and some folks say their cars run rougher w a row tune.
The Radium King is offline   Reply With Quote
Old 01-14-2020, 07:41 AM   #32
Who's askin'?
 
maytag's Avatar
 
Join Date: Mar 2018
Location: Utah
Posts: 2,380
Quote:
Originally Posted by The Radium King View Post
totally agree; the thread seemed to be going too smooth, however, so thought i'd throw some sand in the vaseline.



how about those who say that the post-cat o2 sensors are used to fine-tune fuel trims?
I have a tune that doesn't monitor them, and I've noticed it runs very rich that way. But there could be other parameters in the tune causing that condition.


Sent from my SM-G970U using Tapatalk
maytag is offline   Reply With Quote
Old 01-14-2020, 10:47 AM   #33
edc
550 Anniversary
 
edc's Avatar
 
Join Date: Jul 2012
Location: Surrey, UK
Posts: 709
Garage
Quote:
Originally Posted by The Radium King View Post
and some folks say their cars run rougher w a row tune.
I guess it's all relative. I never hear of any UK or Europe cars complain of rough running due to the standard mapping. I've had 2 Boxsters in standard tune, modded and remapped and never experienced any running problems.
edc is offline   Reply With Quote
Old 01-14-2020, 11:52 AM   #34
Registered User
 
The Radium King's Avatar
 
Join Date: Apr 2010
Location: Canada
Posts: 2,987
me neither, but playing devil's advocate. i think it was brad roberts who made the statement. some ecus do use feedback from the second set of o2 sensors to refine the data from the first set, and i think the bosch units in our cars have that ability. whether they do or not is questionable. and if they did, realise that deleting the second set wouldn't result in big changes in afr, but rather slight changes, perhaps more erratic short-term trims, etc. here's a link:

https://mechanics.stackexchange.com/questions/37442/is-the-after-catalyst-oxygen-sensor-used-for-engine-mixture-control

and here is info regarding how the o2 sensor accesses reference air via the wire sheath:

http://www.autotap.com/techlibrary/understanding_oxygen_sensors.asp
The Radium King is offline   Reply With Quote
Old 03-22-2020, 01:21 AM   #35
Who's askin'?
 
maytag's Avatar
 
Join Date: Mar 2018
Location: Utah
Posts: 2,380
This thread has some comments which suggest to me that if I were to own a PTS2, I could flash the computer to a 996 ROW tune. (Thereby alleviating some issues I'm having, described in another thread)

Is this true? What else is needed? Where do I get the file to flash?

What ELSE does a PTS2 allow me to do, that my enthusiast durametric doesn't? I'm debating the $$.

Thanks in advance.

Sent from my SM-G970U using Tapatalk
maytag is offline   Reply With Quote
Old 03-22-2020, 05:24 AM   #36
1998 Boxster Silver/Red
 
Join Date: Sep 2017
Location: 92262
Posts: 2,268
Quote:
Originally Posted by maytag View Post
This thread has some comments which suggest to me that if I were to own a PTS2, I could flash the computer to a 996 ROW tune. (Thereby alleviating some issues I'm having, described in another thread)

Is this true? What else is needed? Where do I get the file to flash?

What ELSE does a PTS2 allow me to do, that my enthusiast durametric doesn't? I'm debating the $$.

Thanks in advance.

Sent from my SM-G970U using Tapatalk
If you get the PTS2 I'd like to claim the right of first refusal on the Durametric.
__________________
1998 Porsche Boxster
1986 BMW 325es
2012 Ford Edge Sport
Starter986 is offline   Reply With Quote
Old 03-22-2020, 06:32 AM   #37
Porsche "Purist"
 
Paul's Avatar
 
Join Date: Aug 2003
Location: Wisconsin
Posts: 2,112
Garage
The PST-2 has all stock flashes for all models it covers.

Some of things it can do:

recalibrate gas gauge
replace immobilizer while allowing existing keys to be used (assuming old data can be pulled)
replace DME
program new keys

Most of the above require VIN specific passwords available from the dealer's IPAS system.
__________________
1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster original owner. I installed used motor at 89k.
1987 924S. 2002 996TT. PST-2
Owned and repaired Porsches since 1974. Porsche: It's not driving, it's therapy.

Last edited by Paul; 03-22-2020 at 06:38 AM.
Paul is offline   Reply With Quote
Old 03-27-2020, 11:24 AM   #38
Patriot
 
particlewave's Avatar
 
Join Date: Mar 2012
Location: Ft. Leonard Wood
Posts: 6,139
Garage
Quote:
Originally Posted by The Radium King View Post
so, do anyone you subscribe to the 'reference o2' stuff regarding continuity of the wire jacket?
This was briefly touched on, but yes.

Modern O2 sensors get their reference air from the tiny gaps between the wires and insulation. You can solder, crimp, whatever, but if you are doing the wire work between the sensor and connector, then you need to make sure not to block the reference air.

Crimp will have no issues, but solder might if you do it too close to the end of the insulation (the solder will flow down the wire a bit and fill all gaps, blocking reference air). The resistance thing is just a case of a bad internet rumor.

Just make sure not to block the end of the insulation with a big glob of solder (or you could make a small nick in the insulation that ref air can be drawn through) and youíll be fine.
particlewave is offline   Reply With Quote
Old 03-27-2020, 11:46 AM   #39
Who's askin'?
 
maytag's Avatar
 
Join Date: Mar 2018
Location: Utah
Posts: 2,380
Quote:
Originally Posted by particlewave View Post
This was briefly touched on, but yes.

Modern O2 sensors get their reference air from the tiny gaps between the wires and insulation. You can solder, crimp, whatever, but if you are doing the wire work between the sensor and connector, then you need to make sure not to block the reference air.

Crimp will have no issues, but solder might if you do it too close to the end of the insulation (the solder will flow down the wire a bit and fill all gaps, blocking reference air). The resistance thing is just a case of a bad internet rumor.

Just make sure not to block the end of the insulation with a big glob of solder (or you could make a small nick in the insulation that ref air can be drawn through) and youíll be fine.
I came to the same conclusion a few days ago. I've been chasing some odd codes, and I think I dicked-up the o2 sensors when I lengthened the wires, by sealing them up too tightly with Shrink-Wrap the entire length, from connector to connector (up and over the connector shoulders). I'm going to replace the after-cat sensors and build extension cables for them, instead of cutting them up.

For the record; I never would've believed it. As I mentioned below, I always chalked that up to voo-doo.
maytag is offline   Reply With Quote
Old 03-27-2020, 01:32 PM   #40
Registered User
 
Join Date: Sep 2019
Posts: 64
Does anyone make a bosch 02 sensor extension pre-wired with harnesses for plug and play/ ready to go for our 986?

aparke4 is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 09:02 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page