I'm thinking about getting an electric cutout. My question is, won't this decrease back-pressure for the motor and make me lose a little bottom-end? I want it to lower my times and raise my MPH a little. From a performance standpoint, will this help me at all? I also want one because my car's too quiet and they sound pretty damn cool.

 

You will lose a little down low, but more than make up for it up top. You will gain a few tenths at the track also, if I'm not mistaken....

 

I consistantly run .1 quicker in the 1/8th mile with my cut-out open. Definately a gain, even though it won't feel like it when you're driving around.

 

usually people lose about .1-.3 tenth in their 1/4 mile with a cutout. And it doesnt take away much from downlow, and you gain more than you lose up top. And it also makes the engine sound badass.

 

I haven't had a chance to run mine at the track but I do know it sounds cool. I'm liking the predictions though.

 

Hey LOW TRAC, Just wanted to say awesome name. Thats my license plate.

 

I gained at least a 0.1 and the engine seems to rev faster and more freely now. Also, it sounds badass with stock manifolds and cats. Plus its cheaper than a cat back exhaust. And you can always close it if you need some quiet time while driving!

 

Thanks, thats my plate too.

 

FWIW, I gained 10rwhp and 4lb.ft with a lid and a cutout. Just dynoed it yesterday.

And it definetely sounds pretty nice.

TS

 

i gained went from 291/296 to 303/309 with my QTP electric cutout.

 

I gained 3 mph in the 1/4 with my cutout.

 

Hey 95GRNZ, haven't seen you around in a while. I think your old numbers were like right where mine are right now. Good to hear the cutout yielded good results.

 

realize the gains from a cutout are HUGELY dependant on the type of catback or muffler you are running.

i bought a magnaflow catback off a buddy, he had a cutout installed and had it dynoed open and closed. he only gained 4hp with the cutout open over the magnaflow muffler.

this is due to the MF being quite free flowing to begin with.

just a thought. on a stock car it is WELL worth it

 

Holy cow! Somebody remembers me???

Yeah, I've been pretty busy the whole summer and I haven't been posting too much on any of the boards I frequent. I've been reading the boards almost on a daily basis, though.

I'm still slightly disappointed about the results. Even though I shouldn't be. I was hoping to go over 310rwhp. Maybe when the weather cools down a bit.

 

Cutouts are definitely worth it IMO. At the track yesterday, my Dad opened up the exhaust on his '73, and the MPH went up from 105 at best, to just under 110!! (109.72) I'm not sure how much it affected the 1/4 time though, 'cause while I ran it into the 12's (12.795) from a best of 13.2, I think that we weren't driving the car right in the first place. BUT, the MPH definitely went up.

Unless you've got the most free-flowing cat-back & muffler in the world, then a cutout will increase HP in almost all cases.