Boost Actuated exhaust cutouts and more boost
Boost Actuated exhaust cutouts and more boost Hi guys,
I have an 05 Corvette with an LS2, Heads, Cam, M112 Supercharger, 102mm TB, and a full length exhaust. Made about 560whp on a crap tune. I am running 9lbs of boost. I am having the car re tuned in the spring time; meanwhile I am trying to figure out a nice way to squeeze about 60hp more from my setup. LS2 is a stock bottom end and my blower is tiny so heat could become an issue. I have a magnaflow exhaust on the car which is not known for being the best but it sounds good for the street and isn't annoying. My plan was to add a set of electric cutouts just past the headers, but I don't want to listen to the noise all the time. I ran across a company that makes a set of stupidly expensive boost actuated exhaust cutouts. I like the concept. Only noisy at WOT. I am figuring if i pulley down just one more size with a decent tune and a set of cut outs I can hit my goal safely. SP Cutouts are $450 a piece. Is there any better cost effective solution that's not going to leak other than these? I have been searching the web and i am not finding too much info on this concept at all.
DG
I have an 05 Corvette with an LS2, Heads, Cam, M112 Supercharger, 102mm TB, and a full length exhaust. Made about 560whp on a crap tune. I am running 9lbs of boost. I am having the car re tuned in the spring time; meanwhile I am trying to figure out a nice way to squeeze about 60hp more from my setup. LS2 is a stock bottom end and my blower is tiny so heat could become an issue. I have a magnaflow exhaust on the car which is not known for being the best but it sounds good for the street and isn't annoying. My plan was to add a set of electric cutouts just past the headers, but I don't want to listen to the noise all the time. I ran across a company that makes a set of stupidly expensive boost actuated exhaust cutouts. I like the concept. Only noisy at WOT. I am figuring if i pulley down just one more size with a decent tune and a set of cut outs I can hit my goal safely. SP Cutouts are $450 a piece. Is there any better cost effective solution that's not going to leak other than these? I have been searching the web and i am not finding too much info on this concept at all.
DG
I have an sp boost activated cutout on my turbo car. It is pretty awesome. But yes ridiculously expensive and the flange you need they charge extra for. They machine it every so different from a standard 3 bolt flange so you need to buy theirs.
If you arn't sure and just want to dyno test the idea of a cut-out, simply remove the exhaust system at that point, or use a cheap version on the OEM exhaust system (throw away system if it doesn't work out) just to see what sort of gains you will be getting, before spending big $$ on a permanent soln
Trending Topics
Ill give those loud valves a try. I am worried about leaks but $400+ each is just too much for something so simple.
DG
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
I thought of this and variations of it. The problem is, most of the cutout designs are not intended to be run at partial openings, and having them open gradually under pressure can ruin them, or at the very least I have had them stop shutting completely and start to rattle. I still run them like this; it just means you need to be more able to remove the device for maintenance (use a V-band clamp and easy location, also loctite every nut and bolt inside the device before using it initially as they tend to rattle free)
One thing I do notice that is nice is that the performance of the engine seems to be unique at certain open positions, my favorite is about 25% open on my engine, seems to really wake up the low end torque. I am sure it has something to do with a critical exhaust gas velocity. This is a feature you can not adjust on traditional exhaust systems. I intend to dyno test this "feeling" I have really soon. I am guessing a specific position is worth some torque from 2000 to 4000rpm on my car.
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
Given the small blower ...intercooler or not ? Chuck a meth kit onto it and you'll easily be able to release more power and not need to worry about noisy exhaust add ons.
it'll certainly be much better value than the exhaust cutouts.
If you really want a noisy exhaust/leak and some sort of cutout, if these are still available these would be more reliable than the electronic versions and to a degree offer variable opening with boost. Not sure if they sell them with different pressure cans or not, but they're bound to.
You could play with the lever arm to adjust opening rates etc
http://www.cobaltss.net/forums/suppo...epower-284725/
it'll certainly be much better value than the exhaust cutouts.
If you really want a noisy exhaust/leak and some sort of cutout, if these are still available these would be more reliable than the electronic versions and to a degree offer variable opening with boost. Not sure if they sell them with different pressure cans or not, but they're bound to.
You could play with the lever arm to adjust opening rates etc
http://www.cobaltss.net/forums/suppo...epower-284725/