Bullets off the collector or keep Y pipe
03-31-2010, 02:16 PM
#41
That's perfect. I would SO love to put that on the car.
The new setup, depending on what I end up with for heads, might require fabbing headers on the car.
If I have to do that, I'm gonna go with a big primary and even bigger collector, I'd love nothing more then to put strait pipe on back to where the exhaust has to exit, but we'll see.
Header size will be well... as physcially big as I can fit in the car. I'm anticipating having both sides get installed in sections, if need be at this point. Not sure who makes a 5 inch in/out muffler, but I guess I'll figure that out when the time comes
Small *** high spinning motor, big *** blower, and headers that make john holmes feel inadequate.
Perfect.
The new setup, depending on what I end up with for heads, might require fabbing headers on the car.
If I have to do that, I'm gonna go with a big primary and even bigger collector, I'd love nothing more then to put strait pipe on back to where the exhaust has to exit, but we'll see.
Header size will be well... as physcially big as I can fit in the car. I'm anticipating having both sides get installed in sections, if need be at this point. Not sure who makes a 5 inch in/out muffler, but I guess I'll figure that out when the time comes
Small *** high spinning motor, big *** blower, and headers that make john holmes feel inadequate.
Perfect.
03-31-2010, 08:20 PM
#42
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JaSSon,i have a 3" H pipe with 1 chamber borla XR-1s dumped at the axle with cutouts about 10-12" past the header collector. On the dyno i went from 447rwhp through the Duals XR-1s (mufflers) and went to 403rwhp with the cutouts opened on back to back pulls A/F ratio went from 12:8- 12:5 or something like that,so it did not go freakish rich but could go leaner and pick up power but gaining the 30+rwhp back with leaning the car out more did not seem like it was possible.
Do any of you know why i lost this much and now that im running a SD tune and a more aggressive topend setup could i gain something now by putting the Borla XR-1s behind the header?
Do any of you know why i lost this much and now that im running a SD tune and a more aggressive topend setup could i gain something now by putting the Borla XR-1s behind the header?
04-02-2010, 12:12 PM
#48
Nothing. You take a Y pipe with a muffer off, and run just a header extension, or even a turndown off the collector, and I just about guarintee that it will make the same or more power, and will run better on the track.
I've yet to see a car drop the exhaust off and not pick up on the track.
I've yet to see a car drop the exhaust off and not pick up on the track.
04-02-2010, 12:22 PM
#50
If you want to make the most power, then don't run anything off the headers, a turndown to try to help keep the car clean, that's all I'd do. Anything more is just restriction and a waste.
Tune the car in open loop so all the O2's can be ditched, then there's no concern for them either.
I tested this with my car when I ran it n/a, and I found it to be best off, with nothing at all... and that was retuning for each change (went from a Y with a flowmaster merge and a LM to just the Y, then to headers with 18 inches of pipe, then just the turndowns.. I can say that my testing was sound.
Tune the car in open loop so all the O2's can be ditched, then there's no concern for them either.
I tested this with my car when I ran it n/a, and I found it to be best off, with nothing at all... and that was retuning for each change (went from a Y with a flowmaster merge and a LM to just the Y, then to headers with 18 inches of pipe, then just the turndowns.. I can say that my testing was sound.
04-02-2010, 05:28 PM
#51
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If you want to make the most power, then don't run anything off the headers, a turndown to try to help keep the car clean, that's all I'd do. Anything more is just restriction and a waste.
Tune the car in open loop so all the O2's can be ditched, then there's no concern for them either.
I tested this with my car when I ran it n/a, and I found it to be best off, with nothing at all... and that was retuning for each change (went from a Y with a flowmaster merge and a LM to just the Y, then to headers with 18 inches of pipe, then just the turndowns.. I can say that my testing was sound.
Tune the car in open loop so all the O2's can be ditched, then there's no concern for them either.
I tested this with my car when I ran it n/a, and I found it to be best off, with nothing at all... and that was retuning for each change (went from a Y with a flowmaster merge and a LM to just the Y, then to headers with 18 inches of pipe, then just the turndowns.. I can say that my testing was sound.
04-27-2010, 08:31 PM
#53
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I have Pacesetter LT's with Y-pipe loudmouth catbacks. If I was to change to Bullets and turndowns right from the headers would the car need to be re-tuned? Also, would there be a problem with the 02 sensors? Thanks.
04-27-2010, 11:34 PM
#54
When my car was a bolt on car, I ran bullets off pacesetter headers. Before that I had a TSP 3" y pipe with a single 3" bullet dumped.
If either one "felt" faster it was the y-pipe setup. It also sounded 10x better. Not DEAFENING and dump truck sounding like the dual bullets at cruise, and still sounded mean as hell at WOT.
If either one "felt" faster it was the y-pipe setup. It also sounded 10x better. Not DEAFENING and dump truck sounding like the dual bullets at cruise, and still sounded mean as hell at WOT.
04-28-2010, 07:29 AM
#55
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When my car was a bolt on car, I ran bullets off pacesetter headers. Before that I had a TSP 3" y pipe with a single 3" bullet dumped.
If either one "felt" faster it was the y-pipe setup. It also sounded 10x better. Not DEAFENING and dump truck sounding like the dual bullets at cruise, and still sounded mean as hell at WOT.
If either one "felt" faster it was the y-pipe setup. It also sounded 10x better. Not DEAFENING and dump truck sounding like the dual bullets at cruise, and still sounded mean as hell at WOT.
04-28-2010, 11:39 AM
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No one has answered my question yet. If I change to the bullets or anything equivalent with turndowns right off the headers will I have a problem with 02 sensors and or will I need to re-tune ? Thanks.
