| Author |
Message |
Mad Pierre
Level 10 User
Joined: 18 Jun 2004
Posts: 614
|
| Posted:
Sun Mar 06, 2005 7:56 am |
|
Right had to re-fit the Cat today, due to MOT soon. Well i've lost some of my top end power i.e 5000 rpm plus. but I've gained more torque lower down 2500-5000 rpm. Seem's to make the car quicker where you need it. I took Ben for a little ride in it last night before I re-fitted the Cat. Did'nt get room to fully open it up, Only 3rd  . And the road's had naff all grip with all the damm salt  . But why does the engine make more torque lower down when it got something to work against in the exhaust system ? |
Last edited by Mad Pierre on Sun Mar 06, 2005 11:46 am; edited 1 time in total |
|
|
|
Chris H
Forum Moderator
Joined: 02 Mar 2004
Posts: 19978
|
| Posted:
Sun Mar 06, 2005 9:36 am |
|
In effect the back pressure prevents the cyls overscavenging.
It acts as a blockage so less raw fuel goes down the exhaust at lower rpm's. |
|
|
|
|
Mad Pierre
Level 10 User
Joined: 18 Jun 2004
Posts: 614
|
| Posted:
Sun Mar 06, 2005 9:44 am |
|
Ah bit more fuel in the cyls to burn at low rev's then. |
|
|
|
|
huwwatkins
Site Subscriber
Joined: 10 Jun 2004
Posts: 2317
|
| Posted:
Sun Mar 06, 2005 11:15 am |
|
I take it your keeping the cat on then? |
|
|
|
|
Mad Pierre
Level 10 User
Joined: 18 Jun 2004
Posts: 614
|
| Posted:
Sun Mar 06, 2005 11:42 am |
|
Yep Had a year of fun. So might be selling a stainless De-Cat soon. |
|
|
|
|
Gentle Ben
Site Subscriber
Joined: 07 Oct 2004
Posts: 2281
|
| Posted:
Sun Mar 06, 2005 11:48 am |
|
Keeps the burn in longer! |
|
|
|
|
huwwatkins
Site Subscriber
Joined: 10 Jun 2004
Posts: 2317
|
| Posted:
Sun Mar 06, 2005 12:11 pm |
|
So in thoery mpg should go up a bit.. |
|
|
|
|
Mad Pierre
Level 10 User
Joined: 18 Jun 2004
Posts: 614
|
| Posted:
Sun Mar 06, 2005 12:18 pm |
|
If I get good perfprmace I don't care about MPG. But something like the old man 2.0 sierra when he had it. the Pinto one. Load's of fuel and naff all performance. Come on Ben your the only one on here who as heard the car before I put the cat back on. Valver's with just one back box on sound awesome. |
|
|
|
|
Wicked Neo
FCS Event Manager
Joined: 04 Jan 2005
Posts: 3680
|
| Posted:
Sun Mar 06, 2005 12:32 pm |
|
| Mad Pierre wrote: |
| Yep Had a year of fun. So might be selling a stainless De-Cat soon. |
let me know if u do, i'll have it off ya  |
|
|
|
|
Mad Pierre
Level 10 User
Joined: 18 Jun 2004
Posts: 614
|
| Posted:
Sun Mar 06, 2005 12:40 pm |
|
Heh will do. But if your exhaust is loud now. It be mega loud with a De-Cat. |
|
|
|
|
huwwatkins
Site Subscriber
Joined: 10 Jun 2004
Posts: 2317
|
| Posted:
Sun Mar 06, 2005 12:49 pm |
|
I found that a decat didnt do much to increase the noise of my exhaust.. |
|
|
|
|
Wicked Neo
FCS Event Manager
Joined: 04 Jan 2005
Posts: 3680
|
| Posted:
Sun Mar 06, 2005 12:52 pm |
|
It's loud, stainless steel from the cat back at the mo.
Not a stupidly oversized bore on the backbox, 2 inch pipe, can't stand those huge 4 inch big bore efforts.
 |
|
|
|
|
Roger Red Hat
Site Subscriber
Joined: 13 Oct 2004
Posts: 4722
|
| Posted:
Sun Mar 06, 2005 12:55 pm |
|
is it me...or is your "19" logo a bit scewwiff? |
|
|
|
|
Wicked Neo
FCS Event Manager
Joined: 04 Jan 2005
Posts: 3680
|
| Posted:
Sun Mar 06, 2005 1:00 pm |
|
never noticed it being skewiff when looking at the back of the car, maybe its the lighting in the pic makes it look odd. |
|
|
|
|
Mad Pierre
Level 10 User
Joined: 18 Jun 2004
Posts: 614
|
| Posted:
Sun Mar 06, 2005 1:03 pm |
|
|
|
|
Wicked Neo
FCS Event Manager
Joined: 04 Jan 2005
Posts: 3680
|
| Posted:
Sun Mar 06, 2005 1:09 pm |
|
Nice!!
so more about the vid.
mods to car and time for the 1/4 mile was ? |
|
|
|
|
Bladey
Site Subscriber
Joined: 04 Mar 2005
Posts: 116
|
| Posted:
Sun Mar 06, 2005 1:59 pm |
|
|
|
|
Mad Pierre
Level 10 User
Joined: 18 Jun 2004
Posts: 614
|
| Posted:
Sun Mar 06, 2005 2:03 pm |
|
that was 16.5. I have done 15.8 with seat's removed. the 17's do slow it down. |
|
|
|
|
|
|
