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

Reply
 
LinkBack Thread Tools Display Modes
Old 02-01-2021, 12:05 AM   #1
Registered User
 
Join Date: Feb 2017
Location: Stockholm
Posts: 262
Garage
No SAI vs cats

The man with all the questions, and no answers.. Sorry ;-)

The SAI-thing..

According to the old legend ROW cars has no SAI (Secondary Air Injection, air injected to the exhaust manifolds at cold startup)

My car is a German-sold 986s 2003, it has one set of cats (rear over axle) and SAI as a standard, even though I think that as a German car it should be the same as ROW..

Anyway, letīs say that I would remove the SAI, would that destroy the cats? I have encountered that statement, however how could that be if most ROW-car have cats but no SAI.. This doesnīt add up..

Anyone have a theory?

Robert986 is online now   Reply With Quote
Old 02-01-2021, 09:18 AM   #2
Registered User
 
Join Date: Oct 2020
Location: KY
Posts: 183
Quote:
Originally Posted by Robert986 View Post
The man with all the questions, and no answers.. Sorry ;-)



The SAI-thing..



According to the old legend ROW cars has no SAI (Secondary Air Injection, air injected to the exhaust manifolds at cold startup)



My car is a German-sold 986s 2003, it has one set of cats (rear over axle) and SAI as a standard, even though I think that as a German car it should be the same as ROW..



Anyway, letīs say that I would remove the SAI, would that destroy the cats? I have encountered that statement, however how could that be if most ROW-car have cats but no SAI.. This doesnīt add up..



Anyone have a theory?
I too was under the impression that ROW cars came without the SAI system, this is not correct though! Markus (smallblock454) was super helpful and hooked me up with a copy of the German PET diagram and it indeed shows the SAI system in place. That raises the question of why there are factory block plates for an SAI delete... The mystery continues....

I'm not sure why an sai delete would fry the cats though. That really doesn't make sense to me - the system is designed to bring the cats up to functioning temperature faster, thereby improving they're performance on cold starts. It only functions on cold starts though for this reason.

Sent from my POCOPHONE F1 using Tapatalk
__________________
2000 Box Base, currently undergoing renegade modifications
When the owners manual says that the laws of physics can't be broken by this car, I took it as a challenge...
ike84 is offline   Reply With Quote
Old 02-01-2021, 11:53 AM   #3
Registered User
 
Join Date: Dec 2016
Location: Clifton, NJ
Posts: 996
eh, continually dumping a ton of unburned fuel into the cats is not great, but really the sai only runs for like 90 seconds anyway. Considering how cheap used boxster exhausts are, I would not spend any time worrying about the oem cats.
Quadcammer is offline   Reply With Quote
Old 02-16-2021, 09:55 AM   #4
Registered User
 
Join Date: Feb 2017
Location: Stockholm
Posts: 262
Garage
Quote:
Originally Posted by Quadcammer View Post
eh, continually dumping a ton of unburned fuel into the cats is not great, but really the sai only runs for like 90 seconds anyway. Considering how cheap used boxster exhausts are, I would not spend any time worrying about the oem cats.
That is a valid point!

Robert986 is online now   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 11:53 PM.


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