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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 02-15-2012, 11:23 AM   #41
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Quote:
Originally Posted by Savington View Post
I use the same big-*** Magnaflow that y8s and Braineack use, there is no discernible power difference between that and my 3" straight-pipe, and it is extremely quiet (84dB) even at WOT.
This. As a bonus, when I went V8, I was able to reuse this muffler. A 302 sounds great with this big can. When you quit talking about it and finally decide to go V8 as well, you will be able to do the same. Just sayin.
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Old 02-15-2012, 11:36 AM   #42
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I just don't see the point in doing it. The majority of the benefit of having a free-flowing exhaust is to improve spool, so just having a cutout open in boost defeats the purpose completely, and if you're going to design an exhaust that's free-flowing enough to still spool well while still being quiet around town, then why would you bother with the cutout at all?
Ok, that is a valid point: having poor flow pre-spool will definitely hurt spool.
Damn.
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Originally Posted by TurboTim View Post
The hardest part would be making the valve seal while closed. My limited experience with commercially available electronic valves with halfway decent tolerances/seal still *tick*tick*tick with exhaust leaks. Using an old junk throttle body may help but that's just ghetto.
My understanding is that it will still seal better than most of the electric cutouts due to always having the spring pushing it down vs the motor shutting it closed and not having constant tension on the flapper.
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Originally Posted by Braineack View Post
Ok, I think we are on the wrong page here, when you say this:
I don't assume what you're really saying is this:
LOL
so basically what Andrew said: giving up spool and area under curve for quiet-ness.
The electric cutout is starting to look like a more attractive option.
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Originally Posted by Efini~FC3S View Post
what about this ---> http://www.dynomax.com/mufflers.php?muffler=vt

MotoIQ seemed to like it on one of their project cars.

I was thinking of trying one out on my forester xt...
That's what I was talking about in OP, and Jason has one, and I am considering it as an alternative

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Originally Posted by Stein View Post
This. As a bonus, when I went V8, I was able to reuse this muffler. A 302 sounds great with this big can. When you quit talking about it and finally decide to go V8 as well, you will be able to do the same. Just sayin.
:(
If I didn't live in CA I'd be driving one now.
The more I try to consider "v8 miata street car" and "smog/dmv/stupid cali laws and regulations" the more it becomes "race car only no exceptions". The thought of a corvette has been floating around in my mind, a c6 with exhaust would do me perfectly, but whats the point in having a stock car with just xhaust? boring. There's also the Datsun 240z option, but finding a clean non-rotted shell for less than like 3k is nearly impossible. ugh

I'm still trying to find loopholes in the system and somehow weazeling my way around the bs, but its not looking good.
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Old 02-15-2012, 11:36 AM   #43
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I'm pretty sure Frank up in MD uses the same on his LS1 miata.
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Old 02-15-2012, 11:38 AM   #44
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Originally Posted by 18psi View Post
LOL
so basically what Andrew said: giving up spool and area under curve for quiet-ness.
The electric cutout is starting to look like a more attractive option.

But I'm still confused, you say you want a quiet car, yet you want to dump the exhaust in boost.

that will equal loud *** car.
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Old 02-15-2012, 11:45 AM   #45
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I dont care about how loud it is when I'm at WOT. I guess I should have clarified that. All I care about is that its QUIET during normal, non-spirited, driving.
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Old 02-15-2012, 11:56 AM   #46
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You have my answer then.
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Old 02-15-2012, 11:59 AM   #47
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Originally Posted by TurboTim View Post
Using an old junk throttle body may help but that's just ghetto.
have you not seen pics of the rest of my car? lol
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Old 02-15-2012, 12:32 PM   #48
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Sav and Brain have good points. Spools gonna hurt, now I'm going to say.. just build a 3 inch exhaust with as many mufflers and resonators as you can fit in there.
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Old 02-15-2012, 12:38 PM   #49
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1 muffler. 1 res. 1 cat. no noise.
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Old 02-15-2012, 12:42 PM   #50
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My previous setup had pretty much exactly that: I had 2 HUGE resonators and one of the larger magnaflows in there, even had a resonated tip.

Don't get me wrong, it was very quiet for a full 3" exhaust and sounded fantastic, but going 65-70 on the highway (which is like 4k or something ridic on the 4.30 rear) it still got a bit droney. Call me an old fart, but like I said: if I could have a silent car with power/sound on demand, I'td be the perfect setup. But alas, that's not as easy as it sounds.
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Old 02-15-2012, 12:45 PM   #51
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Quote:
Originally Posted by 18psi View Post
There's also the Datsun 240z option, but finding a clean non-rotted shell for less than like 3k is nearly impossible. ugh
How about a 260z with the V8 already installed? For $3K.

http://denver.craigslist.org/cto/2834693463.html

BTW, if it isn't sold yet one of our forum locals will have it soon.
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Old 02-15-2012, 12:47 PM   #52
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Mine is wife certified, and she hates my car, so I dunno what your deal is. There's no drone the turbo spool and engine tick is louder than any other noise...
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Old 02-15-2012, 12:53 PM   #53
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Quote:
Originally Posted by 18psi View Post
:(
If I didn't live in CA I'd be driving one now.
The more I try to consider "v8 miata street car" and "smog/dmv/stupid cali laws and regulations" the more it becomes "race car only no exceptions". The thought of a corvette has been floating around in my mind, a c6 with exhaust would do me perfectly, but whats the point in having a stock car with just xhaust? boring. There's also the Datsun 240z option, but finding a clean non-rotted shell for less than like 3k is nearly impossible. ugh

I'm still trying to find loopholes in the system and somehow weazeling my way around the bs, but its not looking good.
Solution:
Buy a plot of cheap land in a state without inspections(SC is one), put a mailbox there, register your car there, profit
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Old 02-15-2012, 01:16 PM   #54
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if we made the cut-out out of a throttle body and used an electrical solenoid to operate it instead of boost pressure then hooked up a solenoid or relay to control the solenoid to the nos control circuit through ms. once you punched it you would have an instant open exhaust causing a faster spool.

would this work? just brain storming here...
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Old 02-15-2012, 01:17 PM   #55
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Quote:
Originally Posted by Stein View Post
How about a 260z with the V8 already installed? For $3K.

http://denver.craigslist.org/cto/2834693463.html

BTW, if it isn't sold yet one of our forum locals will have it soon.
Oh dear lord, now you got me thinking about that agin
Kinda wanting an LSx though.
That is a smokin deal, if it was local I'd go check it out today.
Quote:
Originally Posted by Braineack View Post
Mine is wife certified, and she hates my car, so I dunno what your deal is. There's no drone the turbo spool and engine tick is louder than any other noise...
I want 300whp with 0db of noise.
Is that too much to ask?

Quote:
Originally Posted by Boost Joose View Post
Solution:
Buy a plot of cheap land in a state without inspections(SC is one), put a mailbox there, register your car there, profit
Actually currently trying to figure out if I can register a PO box in a friends County (pretending I live with them) that has "sniffer only" testing and no visual, and smog my projects there. If this works out, I'll be on cloud 9 from happiness.
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Old 02-15-2012, 04:26 PM   #56
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I was thinking of doing something like this to deaden the sound at lower rpms. Probably a 4 inch flapper in the 4.5 inch section after the back box. The flapper would be opened with a vacuum / boost actuator.

Would it be any good?
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Old 02-15-2012, 04:33 PM   #57
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you should adapt a bimmer muffler.
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Old 02-15-2012, 04:36 PM   #58
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This thread sucks. Total troll thread. Shaem on you 18psi. Much much shaem.

Just run 4" eveyrthing and put a silencer in. Done
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Old 02-15-2012, 04:41 PM   #59
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I, for one, like my car to be a little loud. I want all the SUVs/vans/brodozers to be able to hear me if they can't see me.

I won't wear earplugs around town, but when I drive out to Texas sometime this summer I probably will. 19+ hour drive will leave your ears ringing in my car.

On an Enthuza or similarly constructed exhaust, one option I've considered for times when you'd want to shed weight and gain a little flow (mostly to shed weight, though) would be to remove the muffler section and replace it with a turndown, then simply reinstall the muffler after the event. A lot more work, sure, but reliable and without the compromise in spool that a vacuum-actuated flapper would have.
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Old 02-15-2012, 04:42 PM   #60
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Quote:
Originally Posted by sturovo View Post
I was thinking of doing something like this to deaden the sound at lower rpms. Probably a 4 inch flapper in the 4.5 inch section after the back box. The flapper would be opened with a vacuum / boost actuator.

Would it be any good?

Quote:
Originally Posted by Braineack View Post
you should adapt a bimmer muffler.

I hope people understand the brilliance behind my reply.
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