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Joined: Sep 2001
Posts: 417
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I have an exhaust shop chop my SE's exhaust off about 3 feet from the back, and they replaced it with a "Y" pipe. This was to fit the new SVT rear bumper I got. The exhaust has no mufflers, and the size of the pipes are 1 7/8 inches. (oh yeah it sounds pretty good too  ) Now, the problem I'm having is after about 6300 rpm my power dropps WAAAY off, and it even backfired on me at 6700! Is this a case of not enough backpressure, or too much backpressure?? Also how bad is it to run the car this way??
99 Ford Contour SE Sport
Manual V6
SVT front/ rear bumper /w Aussie grille
Jet black
Premier DEH-P740MP head unit
matrix display, plays Mp3s!!
800 watt Kenwood amp
2 12" Polk Audio subs
Blue "euro" headlights
Eibach Pro-Kit springs
17" Enkei RS-5
White Indiglow gages
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Joined: Sep 2001
Posts: 417
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OP
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Joined: Sep 2001
Posts: 417 |
99 Ford Contour SE Sport
Manual V6
SVT front/ rear bumper /w Aussie grille
Jet black
Premier DEH-P740MP head unit
matrix display, plays Mp3s!!
800 watt Kenwood amp
2 12" Polk Audio subs
Blue "euro" headlights
Eibach Pro-Kit springs
17" Enkei RS-5
White Indiglow gages
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Joined: Aug 2001
Posts: 1,559
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Moderator
Joined: Aug 2001
Posts: 1,559 |
Sounds like the piping is too small for the exaust flow. You might want to go up to 2"
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Joined: Mar 2001
Posts: 1,537
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Joined: Mar 2001
Posts: 1,537 |
The pipe sizes on an SE are 2.25" all the way through.
The SVT is 2.5 at the Converter, and drops to 2.25 on each pipe after the split.
You need a muffler, either in place of the resonator, or on each of the pipes after the split.
Most people put a high flow glass-pak in place of the resonator, and replace the rear mufflers with pipe.
I dropped my exhaust and replaced it with a used SVT exhaust, minus the resonator.
SOUNDS GOOD...mmmmmmmmm
Pete... 98.5 SE Sport Duratec ATX (P66L) Black Clearcoat on Greystone DOB 11/21/1997 DOP 12/25/1997 PIAA 510 Super White Driving Lights SVT CAT-BACK EXHAUST (No Resonator) DiabloSport Chip (LPQ4) - Engineered To Raise Hell Too many other mods to list... Sounds sweet, runs quick... Crazy Horse Dyno @ 121.4 WHP/129.6 TQ
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Joined: Jul 2000
Posts: 291
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Posts: 291 |
YEAH, YOU CAN ONLY GO TO A BIGGER PIPE, NOT TO A SMALLER PIPE FROM A BIGGER PIPE..
TOO MUCH BACK PRESSURE.
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Joined: Sep 2001
Posts: 417
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Posts: 417 |
So it has too much backpressure?? Even though I went form a single exhaust setup with a muffler (witch mufflers produce backpressure) to a duel setup, which has more piping and probably all together would equal about a 2.5" exit (combinding the 2 pipes into their square areas). Sorry if I talk stupid, but I'm not firmiliar with exhaust too much. Anyway, how bad is it to run my car this way if it has too much/ too little backpressure
99 Ford Contour SE Sport
Manual V6
SVT front/ rear bumper /w Aussie grille
Jet black
Premier DEH-P740MP head unit
matrix display, plays Mp3s!!
800 watt Kenwood amp
2 12" Polk Audio subs
Blue "euro" headlights
Eibach Pro-Kit springs
17" Enkei RS-5
White Indiglow gages
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Joined: Jul 2000
Posts: 1,701
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Joined: Jul 2000
Posts: 1,701 |
It's bad... If your backfiring, your risking some potential cylinder and or cat damage. The Y pipe to smaller pipe :rolleyes: doesn't make any sense and will make a mess up your exhaust flow.
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Joined: May 2000
Posts: 1,355
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Joined: May 2000
Posts: 1,355 |
SE Stock exhaust is 2" piping. SVT stock is 2.25".
Simon W. Las Vegas.
96 SE V6 MTX Tereador Red (1st Blown Engine, better be the last!)
1999 SVT Engine
SVT Exhaust w/custom DTM Tips and optimized Y-pipe and no Res (thanks to Po-Jay!). LSD Quaife(thanks to Terry!), SCA CAI w/KKM, Grizzly clutch, FMS 9mm wires, Airknights custom short shifter.
"You can only get more rice at one time by ordering Chinese" - Davo7SVT
"it's only nuts and bolts" - Terry Haines
"Drive it like you stole it" - Me!
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Joined: Oct 2000
Posts: 147
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Joined: Oct 2000
Posts: 147 |
At the engine rpm you listed.... you could be hitting the rev limiter / fuel cut off limiter. The ECU is designed to keep you from over revving the engine. I think it backs off the timing and starts to shut off the injectors, thus preventing you from over revving the engine.
99 SE Sport..ATX
SVT exhaust
SVT zip tube and air cleaner assembly
Tinted windows
17" Cougar Zn Wheels
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Joined: Sep 2000
Posts: 5,805
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FWIW...now such thing as too little back pressure...only an non-updated calibration/intake system to match it! 
V6 MTX
'Don't p**s up my back then tell me it's raining!!!"
'Its only nuts & bolts!'
'If I build it,fix it,upgrade it or modify it...MAYBE they will come....!
Haines Motor Sports Inc,
Dealer for 'Quaife America' & 'Autotech Sport Tuning'
SOLE USA Dealer for the American Axle 'AUSSIE BAR'...
Get a Turbo for you Zetec from HMS Inc...by 'The Demon' ...www.DemonDynamics.co.uk
..don't talk about it DO IT !!!
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