exhuast change car slower
08-16-2008, 01:01 PM
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exhuast change car slower hi i have a cammed stalled ls1 camaro. car is making 366 to wheels when dynoed last year.i went from borla catback to true duals with no x or h pipe just straight off each header and bullets dumped before rear.the car doest seem to have lowend power at track.last year ran 12.98 @ 109 on street tires 2.1 60 ft this year with 4.10s and duals best i can get was a 12.68 at 109 with 1.8 60 ft.could exhuast hurt it this bad
08-18-2008, 10:43 PM
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tsp 231/237 cam,3600 stall,4.10s slicks thats best i can do.im thinking its exhaust because las year i went 12.98 at 108 with 2.01 60 foot on street tires this year with duals and 4.10s went 12.68 at 109 with 1.89 60 ft on slicks
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08-20-2008, 08:19 PM
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Slicks will slow the trap speeds but with a 3600 stall you should 60' a lot better than that. Heck I ran 12.3x's at 110 in my car with a stock cam and bolt on's, 3600 stall, 3.73 gear, on sticky tires cutting 1.7-1.8 60's. Also that was with Flowmaster 1 chamber muffler clamped onto the collectors of the headers.. no H or X pipe so I doubt the exhaust is causing any loss in hp.
08-20-2008, 09:04 PM
#10
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Of course not. Open headers is terrible for any kind of low end power. An X-pipe in most cases will even outperform open headers for peak power. If you add a crossover pipe, you'll pick up gobs of power. If you want low end, the H-pipe is the way to go. If you want top end at the expense of some low end, go X-pipe.
08-20-2008, 10:40 PM
#12
hmmm lets see, I'd say there is something wrong with the car, with that cam if its tuned right, you should be in the 11's. Not slower than most peoples bolt on time. Exhuast will make a difference but you are way off the mark with your mods. Done a compression check recently?
08-20-2008, 11:29 PM
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yea im going back to single y pipe set up and see what happens the noise is driving me nuts along with the neighbors complaining.i watched some videos that i didnt know my freinds had and its spinning through the 60ft so im going to try a set of 28x10.5s i have.idk i had car tuned last year with everything except gears and had gear changed done last month so im lost why the car is slow out of the hole but from a 25 roll on street it destorys street tires on the street i think its the exhaust killing the bottom end
08-21-2008, 12:30 AM
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Was the stall put in before or after the cam change, tune and gears or before? I had a similar problem after I finished my build. The stall was cut for a bolt on car so after I finished all of the engine work the car would only stall to about 2800rpm. It was a 3600rpm stall before. This was due to the torque being moved up futher in the RPM range. I went from running 12.60 @ 107 with a 1.78 60ft. bolt ons only to running a 11.72 @115mph with a 1.68 60ft. heads and cam. I've since sent the converter back to get recut to a 4400rpm stall and installed a ported fast 90mm tb and Nick williams tb and had the car retuned for the 4.11 gears and 28' tall tires. My next pass in the heat should be very low 11's and hopefully high 10's in good air. Try foot braking the car and see how high you can stall it without breaking the tires loss. After you do that take that RPM and add 600 rpm to it and that should give you a ball park of how high your converter is stalling. It may need to be pulled and recut. Hope this helps.
08-21-2008, 11:23 AM
#15
Are you the white camaro that goes to the dumdumdumdumdum meet? If you have a cam and are only maing those numbers, I would want to see whats up with that...
Like others have said, you should be well into the 11's... you don't even want to know what my stock cam car runs.
Like others have said, you should be well into the 11's... you don't even want to know what my stock cam car runs.
08-21-2008, 12:33 PM
#16
hi i have a cammed stalled ls1 camaro. car is making 366 to wheels when dynoed last year.i went from borla catback to true duals with no x or h pipe just straight off each header and bullets dumped before rear.the car doest seem to have lowend power at track.last year ran 12.98 @ 109 on street tires 2.1 60 ft this year with 4.10s and duals best i can get was a 12.68 at 109 with 1.8 60 ft.could exhuast hurt it this bad
