I already knew about them but when I saw them on Musclecar today it got me thinking about my exhaust plans. I'm planning a 387 stroker for my car and the software simulations show it'll make 300 horsepower and 400 ft/lbs of torque with my chosen cam and my current 570 cfm carb (the gain above 570 was negligable). Should make for an awesome commute but 300 is a little on the low side for competition I feel so I'm wondering what sort of gain I might expect with some electrically actuated cutouts. My most recent thoughts about the exhaust system included shorty swap headers, an H-pipe, 2 high-flow cats, maybe 2 cherry bombs, 2.25 or 2.5 piping. If I placed the cutouts early on the H-pipe what could I expect?
more upper hp.. less bottom end torque.
or an easy way to have side pipes and not run them all the time lol
:flame: Well I figured that. Any idea how much horsepower it would gain? Given that they're electric I could probably open them mid-race after the torque peak.
Generally, they arnt worth it unless you have a restrictive exhaust. You NEED backpressure for the car to make power. There is a point of too much, but you need pressure to create the scavaging effect, among other reasons. do a full 2.5" exhaust, and you wont need em.
my Warlock lers have them built in.I've run the car with them closed and open,and there was no difference.I have 2 1/2 inch exhaust,no cats.For a 387,I hope you get a lot more than 300 HP.
I'm just going by what Engine buttstuffyzer said. Based on Edelbrock RPM heads and the cam I chose it makes 400 ft/lbs at 3000 rpm and 312 horsepower at 4500 rpm with open exhaust. Ofcourse the program doesn't account for the design of the heads so it could be higher.
Really? I had those same lers and I could definitely tell the difference. I had NO low-end torque. lol. And it was loud as !
I like those lers better when they're capped and not so loud.
I am planning on doing that but my reason was so that I can be quite when I want and be loud when I want to be loud. I live amongst retired folks and don't want to start up a loud car every morning and risk waking up the neigbors. I just need to find a good ler shop near me that knows how to listen and not catch my car on fire. The elecronic was a litte pricey for me so I was thinking of doing the cable ones. I did see the show too. It is a cool concept. Jason.