Rxmfn7

iTrader: (4)

Im considering LS1 swapping my FD. Cant make up my mind yet, but looking at all my options before I decide. Anyway, are there any mufflers out there that can mellow down the exhaust note of an LS1 with LT headers? I would also be running high-flow cats, and I really dislike the sound of the LS1 engine. Looking for a muffler that is decently high-flow, but will filter out alot of the rumble it creates.

hotrodrx7

I have a Greddy Ti on mine and I like it OK. Check Torque Central. Nattery had a video clip of the same muffler on his car so you can hear what it's like.

DCrosby

If you dislike the Rumble of a V8, you might want to check your Lineage, because that's just "Un-American" even I thought a V8's rumble was cool, even though I thought the rotary was cool in a "Differet" kind of way... that was before I reached "the age of reason"

You're also going to spend a lot of $$ for something that once you restrict the hell out of with cats etc.. and a supressive exhaust, to muffle the sound you'll barely get 20 or so RWHP more out of than going Non-Seq... given it's still way more reliable, and smog legal... but you're throwing $10+k to the wolves... and don't let anyone tell you different unless you're "Supermechanic" and have 2-3 Mo. Min.

In Short, It's good you're doing your homework, make sure this is the right thing for you...

-DC

Crash Test Joey

iTrader: (1)

I don't think you've ever reached the age of reason. You obviously haven't reached the state of knowing what the hell you're talking about.


The answer to the original question is to use the existing FD cat-back system, stock or otherwise suited to your liking. Several people have done this and all have mentioned being happy with the exhaust note.

If you search for posts by Ryan23 on Torquecentral you'll find that he did this with his LS1-FD and easily held his own against a modded Supra from a roll - so there goes the theory of strangling the power with a quiet muffler.

DCrosby

And you're entitled to your "opinion".... sir !

To Support my Point:

Non Sequential, pushing it you might get 300-320 RWHP with ECU

LS1 With stock Cats, Stock Heads, Stock Cam, and restrictive ehaust to get rid of that horrendous V8 rumble... 325-350 rwhp....

digitalsolo

iTrader: (2)

The incorrectness of your post isn't a matter of opinion.

DCrosby

Please do tell what you're basing your "opinion" on....

Since unless you post facts to reinforce your position I'd say you can beat a Lamborghini, in a Yugo... With the right mods....

The right mods being the key factor... since if I tear out the rear seats and stick a Lamborghini engine in, I'd be at par HP wise.. .and under par Weight wise... and nobody said anything about handling... so it's all about how you want to twist the facts in your favor...

Bottom Line, it's your car, you do with it what you want, but if you're trying to squelch the V8 you might be barking up the wrong tree... especially if you're doing it to be accepted by your rotary friends....

And that's my opinion.

Rxmfn7

iTrader: (4)

C'mon guys....
Anyway, I never specified stock cats. I am in the process of researching my mods, and so far it looks like I will be going with a 225/225 114LSA cam, TEA stage 2 or 3 heads, combined with a set of JTR longtubes with dual H-F cats. Ive also been in contact with Hinson and they said they can incorperate cats into their Y-pipe, so that is an option also. I willingly admit that I dont know a whole lot about the LS1, but I also know enough to do my research and not jump into anything without being certain of my decision, which is why Im here asking questins, and on TC, and on LS1Tech. I want ~450RWHP out of the LS1. I would have thought my currect cat-back would not do a good enough muffling job, being its a straight through design (HKS Carbon Ti).

And as for me not liking the sound.. thats just a personal preference. Its not just dislike of V-8s, but I dont care for the LS1 note, but it could be just all of the exhausts Ive heard. I like the sound of early 90s Ford 5.0s, and the 4.6 in the newer GTs sounds great to me also. Just something about the chevys I dont like.

Crash Test Joey

iTrader: (1)

This:
Your numbers are wrong unless you're buying everything brand new, including a motor and transmission. Many people have stated repeatedly that the swap can be done for significantly less if you sell your rotary and related parts. I believe one even had money left over after the fact. And you don't have to take months to build the car. It's been done in a weekend.

Now combine that with the fact that 20rwhp makes much less difference than the torque that comes with it, along with where in the rpm range that torque arrives. If you think you're throwing money away for the difference, you need to go for a drive in one. And who the hell changes engines so their friends will accept them? Maybe you need better friends.


I beleieve some guys have used pre-silencers and a stock or aftermarket muffler designed for use with the rotary. The louder it is with the rotary... well, you already know that.

Not sure if you looked it up yet or not, but Ryan23 stopped by my house to hear my Magnaflow setup (dual 3" y into single 3", no cat, single Race series muffler) and thought it was too loud, and since then he's posted his setup (can't remember exactly what he's got). He did say it was a lot quieter than mine, which sounds like the same ballpark you're looking to be in. He's also got a very not-stock head/cam setup, so you'd probably do very well to copy whatever he is using.

digitalsolo

iTrader: (2)

I don't disagree with what you're saying in THIS post.

HOWEVER, a high flow cat feeding a stock (or well quieted) exhaust system in an FD is not going to make a massive power difference on a stock (or mostly so) LS1. THAT is what was incorrect (and has been proven factually so a few times). Your post wasn't edited when I quoted it either. That said, we're all friends here, how about a group hug?

DCrosby

You're a Dreamer then, not a realist. In my own personal experience, and in what posts I've read.

Usually from the time you place the order, Hinson Quotes you 2 Weeks alone for the Subframe (Experience may vary with granny) then you're waiting for the radiator kit, the intake, the battery kit, wiring harness etc. etc. etc.... unless you're fabbing all this yourself and sourcing it from Summit, which will take more time. Due to Out of stock, and getting ahold of a aluminum welder etc.. etc... so once you're done waiting for parts to arrive you May talk about a weekend. But that's if you've done it before, or are Mr. Supermechanic (which I stated before)

As far as cost did I say ANYTHING about selling the FD motor ?? No...
That's up to the owner, and if the original motor still is in running condition. Usually for someone to do the swap they either know how unreliable the 13B is, or they just found out... so I'm not making any assumption on that part, and you didn't specify this in your post calling me out.

I can't comment on the torque difference, or when it comes on, I am currently waiting for my FD to be completed 6.5 mo. since it left my home with a rotary in it. and counting... so if you want to count bad experiences I'd be on the pretty long install time end of things, and personally I'd think 2 Mo. for you to get everything and get it installed is a fair estimate figuring that on the short end you have supergeniouses like yourself who can do it in hours, with one hand died behind his back, and then you have people like me who got caught between a rock and a hard place... and are still waiting for things to come together, which as it looks "Today" they are... who knows what will me misplaced / broken / damaged / or just evaporated into thin air tomorrow....

I'm just trying to give someone a "Clearer" picture of what it actually can take... your oppinion is duely noted, that it's all a breeze, but for some of us things are more difficult than others, and that's Life....

digitalsolo

iTrader: (2)

It can be done in a weekend; FC or FD, it just requires ample pre-planning. Having someone who has done the swap before doesn't hurt either.

That said, I do have access to facilities, individuals and personal experience that the "average" joe at home may not have, so my perspective may be somewhat maligned with average. </Drew induced disclaimer>

Russo

you can run Hinson's header, Y Pipe, and a rx7 catback... between the catback and y pipe you'll have 18 inches of "Free" space... which you could put a cat delete pipe or a high flow cat..... the 04 GTO came with this setup and they have 350 hp..

don't listen to what these fools tell you, they're just jealous that you are thinking about moving to a proper motor..

Rxmfn7

iTrader: (4)

Thanks for the info.. and I believe all these "fools" already have some sort of v8 dropped into their cars.

owen is fat

I just have a pair of freeflow resonators on my LS1 in a dual 2.5" setup with an X pipe.
if you want a quieter setup, I would fit several pairs of resonators under the car, wherever you need a straight section of piping. it wont be the lightest weight exhaust setup but it will be quiet and deep and flow very well.

just my 2 cents.
good luck on the swap.

DCrosby

Exactly ! And this is why if I'd put 6mo. I'd expect to get called BS on.... but I've watched other people, and some have openly stated that it took them a weekend... but had done things like this before, and knew what they were doing.

Others have started around the time I did, or later Jan / Feb... and I have yet to see any "Hurray it's Done Threads from them" that might just be they don't have a camera or don't care about the forum.....

And I figured from the time you "Decide" to do this to the time it's done... it can be about 2-3 Mo. given nothing major goes wrong or you're sourcing parts that are on backorder. I also think that from most people's threads waiting for the "Proper" parts to come in has stalled a lot of projects that try to get completed in a hurry.

And All I'm really saying is: Be Ware ! (For the FD) This is not something you want to undertake lightly or in a rush, everything that's worth doing costs $$ (definitely on the FD) and takes time.... and if you have issues with too much torque or HP you need your head checked....

digitalsolo

iTrader: (2)

I agree with what you're saying. A 2 day (and by two day, I mean 40 hours of work in 48 hours of time) swap, requires at least a month, most likely 2-3 of planning and parts gathering, assuming you don't stumble upon a cache of swap parts, metal, welding equipment and AN fittings in an alley somewhere. If you own say, a race shop, you may be in a different boat, but then you probably wouldn't be here asking questions.

Now.. wasn't there a topic in this thread somewhere?

Crash Test Joey

iTrader: (1)

Maybe the car in my garage is a figment of my imagination. I would swear it's an LS1-powered FD that I've driven, but who knows. I bought a half-torn up, fire-damaged shell with no motor or trans and the car itself needed (and still needs) work.

But the engine conversion portion of the swap has about 16 hours of labor in it, plus a trip to the exhaust shop. ALL of the other work pertains to RX7 problems, not V8 swap problems.

THAT is reality, and you don't need to be a "supermechanic" or "throw $10k to the wolves" to make it happen. I don't have any idea why you made those comments in the first place, but it makes you sound like you know nothing more about the conversion than what you read in the 3rd Gen area of this board.

Most of us, anyway

DCrosby

Maybe it is... Haven't seen it (Personally), can't comment ....

Throwing $10K to the wolves was in reference to keeping it quiet, stock ,and not taking advantage of the potential of the LS1, in reference to the sound issue.

Also having a burnt out FD, you of all people should agree with me that Parts for this thing (FD). LS1 or, not are expensive, and doing a swap for $10K is dirt cheap !

You seem to love to misread, append information, make assumptions on my posts, I apologies if they're not as fleshed out and specific as you'd need them to be able to not misinterpret them, but I thought my posts were long winded enough without me getting into specifics...

Bottom Line I just want people to be aware, there are numerous pitfalls, most of which are covered on this and other forums, do your homework before you go off and spend $$ and we see another project abandoned due to a lack of funds, resources, or skill....

-DC

Crash Test Joey

iTrader: (1)

If you had said just this, your post may have been useful, even if a bit condescending. Adding in nonsense about needing several months worth of time to do the swap and $10k being dirt cheap makes you looked uninformed. You had no real-world useful info to offer in this thread so you shouldn't have posted in it. That's the real bottom line.

FCdemon

If you want it quieter, don't use JTR longtubes. Simple.