Re: when is a 3" justified over a 2.5" exhaust? - Saab 9000 Bulletin Board - Saabnet.com
The banner above is an advertisment - if it asks you to download software, please ignore.
Site News -
[General |
Members |
C900 |
9000 |
NG900 & OG93 |
93 |
95 |
NG95 |
99 |
Sonett |
Vintage Models |
Clubs |
Other Cars |
FAQs |
Gifts |
Member Photo Galleries |
Member Directory |
Classifieds |
Manuals |
*Buddy Registry |
*Mileage Registry |
Polls |
What's New |
Raffle |
Photo of the Month |
Sponsors]
[Main 9000 Bulletin Board | BBFAQ |
Prev by Date | Next by Date | Post Followup ]
Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Re: when is a 3" justified over a 2.5" exhaust?
Posted by Joe98 (more from Joe98) on Thu, 20 Feb 2003 09:30:12
In Reply to: when is a 3" justified over a 2.5" exhaust?, RicardoF, Thu, 20 Feb 2003 08:53:32
Members do not see ads below this line. - Help Keep This Site Online - Signup
First, to notice any significant gain in power, the engine must be turbo'd. N/A engines really will not see anything from using a larger diameter exhaust.
When you state 2.5" exhaust, are you referring to an "already-modified" exhaust system? Stock exhaust on the 9K is 2.25". 3" over 2.25" will make a huge gain in performance. 3" over 2.5" will give a slight increase in performance.
Size really matters (don't you hate that?!) only from the turbo to the cat. Once past the cat, the size of the pipe will give minimal, if any, increase in performance. Many people here have 3" from turbo to cat (included), then use an adapter to fit to the rest of the stock 2.25" exhaust. Using a complete 3" exhaust system gives possibly 1 to 2 hp more.
By going to a larger exhaust, it allows the turbo to spool up quicker, as well as run cooler since the exhaust is exiting faster.
Performance gains to be seen are in the 20 to 25 hp range. So, on an Aero, you would be looking at 250 hp, tops. I'm probably padding the numbers here, because I think the consensus is around 23 hp.
You should have no problems with backfiring or engine/turbo malfunction. It is also best to pair the modified exhaust with a larger air intake delivery system (ie.: K&N air filter). But this isn't necessary.
Installing the JT 3" complete, along with a K&N air filter into my '98 CSE was one of the first mods I did, and I can tell you it was one of the best yet! Kind of up there with the poly rear sway bar bushes and the BSR re-mapped ECU (though, that cost the most). And I did the exhaust swap alone (no other mods).
Joe
posted by 12.111.48...
Posts in this Thread:
Members do not see ads below this line. - Help Keep This Site Online - Signup
Post a Followup
No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.
StateOfNine.com
|
SaabClub.com
|
Jak Stoll Performance
|
M Car Covers
|
Ad Available
|
Random Saabnet.com Member Gallery Photos (Click Image)
This is a moderated bulletin board - Posting is a privilege, not a right.
Unsolicited commercial postings are not allowed (no spam). Please, no For Sale or Wanted postings, SERIOUSLY.
Classifieds are to be listed in The Saab Network Classifieds pages.
This is a problem solving forum for over 250,000 Saab owners, so expect to see
problems discussed here even though our cars are generally very reliable. This is not an anything goes
type of forum. Saabnet.com has been a moderated forum since 1988. For usage guidelines, see the
Saabnet.com Mission and Purpose Page. Please remember that you are
not anonymous. Site Contact | Site Donations | Other Sites by SP -
Poverty2Prosperity.org | Run Club Menlo Park | ScreenBot
Site Members do not see red text instructions, bottom of the page anchor ads, or box ads.
Click here to see all
the Site Membership Benefits!