Last x Days Posts  1 | 3 | 7 Days  Search  Topics  Tree View  Help
  Soarer Central * Mechanical - Common * Cats Previous Previous    Next Next  

Author Message
Mike Bradberry
Tinkerer
Queensland
V8 Limited

Posts: 85
Reg: 07-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Monday, November 28, 2005 - 11:01 pm, by:  Mike Bradberry (Halflife) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I was told by the guy who did my 2 1/2" cat back that my cats had been done the cheap way for compliance. I didn' think to ask at the time what he meant. Could I expect to get a performance gain by buying high flow cats.
I think there are 2 up front and maybe another after the join. (V8).Havn't seen under for some time.
Phil Gibson
TryHard
WA
'94 black/black UZZ31

Posts: 248
Reg: 07-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Tuesday, November 29, 2005 - 12:19 am, by:  Phil Gibson (Sciflyer) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

After what ive seen with the V8 cats i would question the point of getting supposed 'high flow' ones to replace the standard items.

If you have a bodgy single-cat conversion then yes get that sorted to one-per-side as it was from the factory, but if you have the stock setup using two factory cats then i wouldnt waste money on getting different ones, the factory items appear to be every bit as good and are better built than most aftermarket cats...
Blaine Hanson
TryHard
WA
V8

Posts: 136
Reg: 08-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Tuesday, November 29, 2005 - 09:05 am, by:  Blaine Hanson (Blaine) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Phil - In WA all cats have been replaced for Aussie compliance. So I guess it all depends on your importer as to what the definition of "standard" replacement versions is. I think everyone who is interested in HP gains should do some research on the model of cats they are running and compare it to the available options. Based on cfm ratings. There are some articles on Autospeed. I personally believe if you help these motors breath better you will gain HP. I had two "standard" cats, then a 3" HF cat ( after I got headers ) and now I have the highest flowing 5" cat available at 1000+ cfm - why ? Each upgrade I gained HP. Is the HP gain worth the extra expense? Now that's another topic again and depends on one's budget.
Blaine Hanson
TryHard
WA
V8

Posts: 139
Reg: 08-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Tuesday, November 29, 2005 - 12:33 pm, by:  Blaine Hanson (Blaine) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I agree Phil, I have also seen inside the original factory cats, and I agree they appear as good if not better than what they are often replaced with. Another stupid compliance regulation.
Phil Gibson
TryHard
WA
'94 black/black UZZ31

Posts: 251
Reg: 07-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Tuesday, November 29, 2005 - 01:40 pm, by:  Phil Gibson (Sciflyer) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Yep my point is the standard factory cats are pretty damn good, you would need to do what you did and get some seriously high-spec cats to improve on them, and even then you'd probably only want to do it if youre upgrading the rest of the exhaust too.

The cats that were fitted to my car as part of compliance were the same ones that Peter uses
here but i found them to be no better than the factory ones and were tinny and inferior build to boot.

After having some sealing problems with them i ended up getting a factory pair and putting them back on...
Blaine Hanson
TryHard
WA
V8

Posts: 140
Reg: 08-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Tuesday, November 29, 2005 - 05:09 pm, by:  Blaine Hanson (Blaine) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I don't blame you there. I think some of the compliance regulations are unjustified. I have seen Dave at Precision throw away many perfectly good factory cats after cutting the flanges off them for Aussie cats. The other thing some members forget is there are two cats in the stock V8 exhaust system. People swap these out and run one cat exhaust system.... hmmm and expect better flow / performance. So like I said above, for those considering a change, please do your research first on cfm flow rates before making any assumptions Don't believe all you read - " Hi flow " - compared to what ??

Add Your Message Here
Eye Candy
Click for full size
Bold text Italics Underline Center Text Upload photo from your hard drive Make a List Make a Table Make an Image Thumbnail Create a hyperlink Insert a clipart image Formatting Help
         

Username: Important Posting Information:
If asking a question, have you done a search to see if your question has already been answered?
Be aware that the use of SMS-speak eg "u" instead of "you" etc, will get your post deleted.
Password:
Enable HTML code in message
Automatically activate URLs in message

  Administration Administration      Log Out Log Out Previous Previous      Next Next