Stock Catback on Turbo Setup

[5ohh_kenny]

What are the dangers of running the stock catback on a turbo setup?

I was just reading a thread that warns against this but It didn’t say if there are dangers of engine or turbo damage or if you just will be losing power.

Im buying a single 7675 gen3 car and the guy has the stock active exhaust on there.

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[svtfever]

Definitely want a catback that will flow. Turbo cars don’t like back pressure. Floating valves is bad lol.

 

[engineermike]

I wouldn’t build a turbo car without a drive pressure gauge. You’ll know really quick if your exhaust is a problem.

 

[DmanDmythDlegend]

When your bringing alot more air in, you need to be able to move alot more air out. A smooth free flowing exhaust will help everything work better and as was said already reduce the risk of back pressure making things move in directions not intended

 

[5ohh_kenny]

I’m looking at doing some electric cutouts for spirit driving. Probably the Granatelli setup. And just keep the stock catback for cruising. Wonder if I can rig something up to actuate the valve under boost incase I forget to do so.... sounds like a good arduino project.

https://granatellimotorsports.com/i...ts-electronic-exhaust-cutout-kit-302530k.html

 

[AZ_whippleS550]

I’m looking at doing some electric cutouts for spirit driving. Probably the Granatelli setup. And just keep the stock catback for cruising. Wonder if I can rig something up to actuate the valve under boost incase I forget to do so.... sounds like a good arduino project.

https://granatellimotorsports.com/i...ts-electronic-exhaust-cutout-kit-302530k.html

I think it should be easy to do something vacuum actuated. You could basically modify the type of actuators that supercharged cars use to close the bypass valve under boost.

 

[wazslow]

I would run boost actuated cutouts like you can option in the hellion sleeper kit. I have them and they work well!

 

[5ohh_kenny]

I would run boost actuated cutouts like you can option in the hellion sleeper kit. I have them and they work well!

My only issue with going this route is that I would like to have the option of it being loud when I want it to be. Not just when I’m in boost.

 

[wazslow]

My only issue with going this route is that I would like to have the option of it being loud when I want it to be. Not just when I’m in boost.

Use electric cutouts with a switch then.

 

[gimmie11s]

My factory catback was causing valve float at 8psi boost.

Changing to 3" mandrel bent turbo-back exhaust made the issue go away and i can now see 13+ psi without float.

 

[beefcake]

if your doing something with cutouts or dumps, i think your fine, if you don't i would def recommend something with straight through mufflers



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[5ohh_kenny]

I’ll do a write up on it when it’s done but I’m going to weld 2 vbands into the exhaust so I can easily and quickly switch from open down pipe to full exhaust. As far as straight through mufflers go I believe the active mufflers in track mode are fairly free flowing. It won’t see more than the 6psi gate pressure with the full exhaust.

 

[Stephen@lethal]

Valve float on these cars is definitely a real thing unfortunately. You should be doing as much as you can to let the turbo setup to breath well. The stock system is pretty restrictive unfortunately.

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