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#301
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Bassani Dual Exhaust
Description
Description
My dual exhaust project utilized the Bassani Tru-Dual exhaust. This is an excellent implementation. I drove with this setup extensively and credit it to have very good qualities: Tangible gains, stainless steel construction, clean deep tone. Bassani's dual exhaust is objectively and subjectively an extraordinary dual exhaust implementation. For quantitative results I did before/after dyno testing at ProDyno, starting with jba shorties and factory ypipe/magnaflow catback. This combo put down a SAE corrected 345 rwhp 325 rwtq with a canned tune. With installation the guys at Pro Dyno (Charles is a regular consultant on the hit television show PINKS) did a perfect job. They dynoed the car and showed a corrected gain of 18 lb/ft midrange. The final numbers came out to a corrected 344 rwhp 343 rwtq though the noticeable difference in midrange was the exemplary factor, with a clean, deep tone.
Then I had the setup re-dynoed at an independent dyno, Carolina Auto Masters, where it produced a corrected 343 rwhp 349 rwtq with the same combo. Those numbers are no small feat for a setup that consisted of jba headers/complete induction (S1 ported ls6, no FAST). Especially the tq numbers. This is LongTube header territory. I would have had more peak hp if the stock cam and valvetrain didn't start to float though anything approaching at or above these numbers are tangible. Then to prove a theory I installed a Dynomax Ultraflow dual-in dual-out muffler to replace Bassani's muffler. This design tweak resulted in no gain on the dyno. Looking closely at the graph there was a loss of 3 hp peak and at low rpms. I didn't take the time to retune with Jeff at CAM, however fluid dynamics suggests Bassani's configuration's effectively optimal. In conclusion, the system is a result of various R&D elements producing tangible results, with implementation and sound the deciding factors.
NotesThen I had the setup re-dynoed at an independent dyno, Carolina Auto Masters, where it produced a corrected 343 rwhp 349 rwtq with the same combo. Those numbers are no small feat for a setup that consisted of jba headers/complete induction (S1 ported ls6, no FAST). Especially the tq numbers. This is LongTube header territory. I would have had more peak hp if the stock cam and valvetrain didn't start to float though anything approaching at or above these numbers are tangible. Then to prove a theory I installed a Dynomax Ultraflow dual-in dual-out muffler to replace Bassani's muffler. This design tweak resulted in no gain on the dyno. Looking closely at the graph there was a loss of 3 hp peak and at low rpms. I didn't take the time to retune with Jeff at CAM, however fluid dynamics suggests Bassani's configuration's effectively optimal. In conclusion, the system is a result of various R&D elements producing tangible results, with implementation and sound the deciding factors.
- In the Prodyno graph the peak tq is noticeably less than the peak tq at CAM. The reason is the relative environmental conditions in AZ result in quantifiably lower peak numbers. In the CAM graph the Bassani combo was dynoed at a more consistent geographic location where relative environmental variables exemplify accuracy.
- In the back-to-back graph taken a few days apart there's no peak hp gain. Basically this combo isn't cat-back limited, therefore the existing cat-forward capacity results in similar peak hp even with additional exhaust system cfm capacity.
- As far as loss of low end tq from muffler replacement concisely the resulting tune of the subsequent combo isn't optimal for a complex dual exhaust system. For completion purposes the next step should be a wideband tune/retune where the results of system dynamics would yield analysis conclusions.
- Cons
- Relatively expensive
- Lowered cars might require rear suspension modification
- Complete dyno/street tune/retune recommended
Here's various clips of Bassani's dual exhaust (the Ultraflow had a slightly deeper tone):
Last edited by lsx24; 01-13-2008 at 03:32 PM.
#303
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Pacesetter Longtubes, High Flow Cats, True Duals with an Xpipe, into Loudmouth Resonators
http://www.youtube.com/watch?v=sAw7nRee7sY
http://www.youtube.com/watch?v=0msr_12bTiU
http://www.youtube.com/watch?v=sAw7nRee7sY
http://www.youtube.com/watch?v=0msr_12bTiU
#304
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In the midrange the exhaust was fairly mild inside and outside the timbre was the best characteristic. The effect turns out as a solid implementation of a dual exhaust system. The jbas increased the exhaust tone more than did the Bassani though cruising down the road you couldn't notice unusual loudness.
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Most metals develop mild surface rust, not a problem as it won't have a component durability effect. The difference is stainless steel repels rust better than less expensive metals lasting exponentially longer in standard vehicle installations. Surface rust might not appear elegant though it's typical.
Last edited by lsx24; 01-11-2008 at 04:05 PM.
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Subsequent XS header information will be posted here: https://ls1tech.com/forums/generation-iii-external-engine/637662-all-xs-stainless-steel-headers-questions-here.html
#312
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Alright, sorry if this is a stupid question but I'm baffled. I bought a TSP TD system not too long ago, haven't had a chance to put it on the car but I was wondering if someone could tell me what kind of mufflers are on it. I've been looking at pictures on the internet for a while now trying to figure it out but I haven't seen anything that matches up exactly. Any help would be appreciated!
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#313
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Here's some pictures of mine. This was done a couple years go, the pics aren't the best. I got the tips on right after we took the pictures. If I get a chance after I move I'll get some better pictures.
The system is 3" all the way back, custom X-pipe, over the axle with Moroso Spiral Flows. The lowest part of the car is still the torque arm crossmember. In the pics it has the Spohn crossmember but I've since swapped to the BMR weld in crossmember.
The system is 3" all the way back, custom X-pipe, over the axle with Moroso Spiral Flows. The lowest part of the car is still the torque arm crossmember. In the pics it has the Spohn crossmember but I've since swapped to the BMR weld in crossmember.
#315
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Has anyone come up with a way to run true duals with a BMR Track Pack torque arm setup? Can you squeeze a X into that spot? My problem is that I have a 4L80e and it sits back pretty far compared to stock transmissions. Pictures would be very helpful.
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-Dustin-
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I have the BMR crossmember on mine. It was built around the Spohn, but there's even more room with the BMR. Even with the 4L80E you should be able to do it with minimal trouble.
#317
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#320
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My exhaust is custom 3" true duals w/ x pipe and short powerstick mufflers. I was gonna go with sweet thunder but powersticks have 3" flowpath and sweet thunder doesnt plus powersticks look like they flow a lil bit better. This was made by SOM WS9 and was made around a UMI torque arm
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97 WS6, Pacesetter Longtubes, Custom True Duals w/ Powersticks
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