TPIS headers...off road pipes, Xpipes.....
Thread Starter
Le Mans Master
Joined: Oct 2001
Posts: 5,577
Likes: 3
From: Southern Maryland Maryland
TPIS headers...off road pipes, Xpipes.....
Is there any gain to running a X pipe right off of the headers instead of straight pipes into your mid X pipe? Does this increase the scavenging effect?
Phillip
Phillip
Thread Starter
Le Mans Master
Joined: Oct 2001
Posts: 5,577
Likes: 3
From: Southern Maryland Maryland
Re: TPIS headers...off road pipes, Xpipes..... (Phil97SVT)
For clarification of setups:
Setup 1:
TPIS headers -> MTI x pipe -> factory H pipe
Vs:
Setup 2:
TPIS headers -> 16" cat eliminators -> magnaflow X pipe
Some say that setup 1 works better because the x pipe helps exhaust scavenging. Anyone know about this?
Phillip
Setup 1:
TPIS headers -> MTI x pipe -> factory H pipe
Vs:
Setup 2:
TPIS headers -> 16" cat eliminators -> magnaflow X pipe
Some say that setup 1 works better because the x pipe helps exhaust scavenging. Anyone know about this?
Phillip
Le Mans Master
Joined: Apr 1999
Posts: 6,129
Likes: 14
From: Vette
Re: TPIS headers...off road pipes, Xpipes..... (Phil97SVT)
Phillip ,
Mine is a different setup, but for what it’s worth check out: http://forums.corvetteforum.com/zerothread?id=414442
Basically I picked up ~10 peak rwHP with X-pipe right behind the headers over the straight pipes (on big motor with 3” exhaust though)
(couldn’t find the 485rwHP run with straight pipes, so I used this 481rwHP, but the TQ curve is almost identical so)
(click it)
Mine is a different setup, but for what it’s worth check out: http://forums.corvetteforum.com/zerothread?id=414442
Basically I picked up ~10 peak rwHP with X-pipe right behind the headers over the straight pipes (on big motor with 3” exhaust though)
(couldn’t find the 485rwHP run with straight pipes, so I used this 481rwHP, but the TQ curve is almost identical so)
(click it)
Burning Brakes
Joined: Jun 1999
Posts: 1,028
Likes: 0
From: La Jolla, CA
Re: TPIS headers...off road pipes, Xpipes..... (Phil97SVT)
The best place for the X-pipe is 16-18 inches after the headers (according to an engine expert). He stated the problem on the C5 is this is not possible without removing/changing the cats ("off-road X-pipe").
Melting Slicks
Joined: May 2000
Posts: 2,974
Likes: 5
From: CenTex Texas
Re: TPIS headers...off road pipes, Xpipes..... (Phil97SVT)
I have the MTI off-road X-Pipe placed right behind the headers......and I actually lost a few HP & TQ at about 4000 rpms, and i didn't pick up any additional HP or TQ anywhere else. So the short answer is "it's not worth the $$$ or headache". IMO.
FYI, this dyno comparison was done on my '97 vette with MTI stage 2 heads, MTI Hammer Cam, and TPIS headers w/MTI off-road X-pipe......and nothing else was added, changed or deleted bewteen dyno runs except the off-road x-pipe.
Here's the dyno comparison. The Black TQ line and Green HP line are the "before" dyno and the Red & Blue lines are the "after" dyno.
FYI, this dyno comparison was done on my '97 vette with MTI stage 2 heads, MTI Hammer Cam, and TPIS headers w/MTI off-road X-pipe......and nothing else was added, changed or deleted bewteen dyno runs except the off-road x-pipe.
Here's the dyno comparison. The Black TQ line and Green HP line are the "before" dyno and the Red & Blue lines are the "after" dyno.
Thread Starter
Le Mans Master
Joined: Oct 2001
Posts: 5,577
Likes: 3
From: Southern Maryland Maryland
Re: TPIS headers...off road pipes, Xpipes..... (Phil97SVT)
I am having a X pipe custom made, should be here next week or so. I will hit the dyno and get some real results. The company was very informative and they said that most of the X pipes on the market aren't built correctly but they claim to have extensive experience with Nascar and high HP applications and he said I should definitely see a gain on the dyno.
Phillip
*cough*Dr.Gas*cough* :D
Phillip
*cough*Dr.Gas*cough* :D
