I'm sick...think my car is developing "The Stumble"
07-14-2017, 09:46 PM
#76
Rennlist Member
Hasn't Porsche said this is "normal behavior" 
Good luck guys. This subject has been talked about for years. Someone needs to get to the bottom of it! It's been toooooo long. I mean, can't a competent race shop figure this out? Can't be that complicated.
If a shop is able to figure out putting in an R transmission in a GT3 RS, they surely can figure out a stumble issue
Good luck guys. This subject has been talked about for years. Someone needs to get to the bottom of it! It's been toooooo long. I mean, can't a competent race shop figure this out? Can't be that complicated.
If a shop is able to figure out putting in an R transmission in a GT3 RS, they surely can figure out a stumble issue
07-14-2017, 11:23 PM
#77
Report for day two. No stumble at all.
just for frame of reference my stumble before was extremely noticeable especially in second gear. The stumble felt like a misfire or a cough where it's severely affected the performance of the vehicle at 2500 RPM. It did go away sometimes or at certain throttle angles, but I could reproduce it pretty much anytime I wanted to at very slight throttle angle. Some days were worse than others. For what seems to be no rhyme or reason.
just for frame of reference my stumble before was extremely noticeable especially in second gear. The stumble felt like a misfire or a cough where it's severely affected the performance of the vehicle at 2500 RPM. It did go away sometimes or at certain throttle angles, but I could reproduce it pretty much anytime I wanted to at very slight throttle angle. Some days were worse than others. For what seems to be no rhyme or reason.
07-14-2017, 11:52 PM
#78
Good luck guys. This subject has been talked about for years. Someone needs to get to the bottom of it! It's been toooooo long. I mean, can't a competent race shop figure this out? Can't be that complicated.
If a shop is able to figure out putting in an R transmission in a GT3 RS, they surely can figure out a stumble issue
If a shop is able to figure out putting in an R transmission in a GT3 RS, they surely can figure out a stumble issue
Did Oswald act alone?
Where's Hoffa buried?
WTF causes the stumble?
07-15-2017, 03:11 AM
#79
Rennlist Member
07-15-2017, 03:13 AM
#81
Rennlist Member
Tomorrow is Saturday, somebody go to your local parts store and pick up two pre-catalytic converter oxygen sensors and install them. Report back the results.
07-15-2017, 03:19 AM
#82
07-15-2017, 08:35 AM
#83
Burning Brakes
No local place stocks the Bosch O2 sensor I need. I'll have to order it online. Looking at $248 for both, plus I'll need the slotted 22mm socket adapter. Did you have any issues getting the old ones out? What torque did you use to tighten the new ones in?
07-15-2017, 09:55 AM
#84
Rennlist Member
07-15-2017, 09:57 AM
#85
Rennlist Member
you can try your local Porsche dealer but you'll spend probably double. My local Porsche dealer it will match online Porsche dealer prices. I go to Sunset Porsche and show them that price and they will match it. I believe sunset sells them for about $185 apiece. I do have the slotted wrench for getting out the O2 sensors but the slot is too small for our multi wire 02 sensors so I just use a regular wrench . I used the German standard of Gundentite.
07-15-2017, 02:03 PM
#88
Rennlist Member
Yep if that fits your vehicle, order two of them. One for each header.
07-15-2017, 02:13 PM
#89
Rennlist Member
I doubt both are bad get one and try it on one side first then the other see what happens.
07-15-2017, 03:54 PM
#90
Rennlist Member