Taurus Car Club of America : Ford Taurus Forum banner

1 - 20 of 31 Posts

·
Registered
Joined
·
375 Posts
Discussion Starter #1
I am thinking of cutting out the cat and put in a peice of pipe which i have already seen done, then put on som 40 series and then some hopefully awsome tips to finish it off, any thoughts or ideas would be appreciated,
thanks
jorsh
 

·
Registered
Joined
·
486 Posts
people have done it and say it works so I would say go for it. Only thing I would change would be to leave the tips out of it, a little too ricey for me.
 

·
Premium Member
Joined
·
1,930 Posts
I say include the tips, some nice chrome ones.
I would advise against cutting out the cat, especially if you have emissions testing in your area. You won't pass. If you have to take it out, at least replace it with a high-flow cat so you can at least pass a visual inspection.
From what I've heard, Flowmasters 40 series sound pretty nice, and that's what the majority of people go with when they replace their mufflers.

-Rob
 

·
Premium Member
Joined
·
405 Posts
No, it's a bad idea.....leave the cat(s) in. Per the USA Today article on Friday, there is going to be a big crackdown for a lot of areas on emssions, and I'll bet that it will entail emissions tests starting up again.

In any case, the cat is not a performance impediment. In fact, on a basically stock motor, the whole exhaust system is not a real impediment. Mufflers are changed (for SHO folks) primarily for the sound factor, and the performance gain (if any) is negligible.
 

·
Premium Member
Joined
·
1,306 Posts
From a purely performance standpoint, straight through, free flowing mufflers are better than Flowmasters. The flows use a series of baffles that will impede the path of the exhaust gas, instead of insulation material wrapped around a mesh pipe.
 

·
Premium Member
Joined
·
405 Posts
Originally posted by 93taurusSX@Apr 17 2004, 05:43 PM
From a purely performance standpoint, straight through, free flowing mufflers are better than Flowmasters. The flows use a series of baffles that will impede the path of the exhaust gas, instead of insulation material wrapped around a mesh pipe.
Not necessarily.

Long story short, I pulled the mufflers off my '99 SHO and had straight pipe put in to the tips as an experiment. The car fell on it's face in the midrange, lost 4-5 tenths in the 1/4 mile, and didn't start waking up until about 5,700 rpm......not even considering the way-too-loud exhaust note.

A set of Thrush turbo mufflers went back in after a week! the power came back, and it gave me a bit of sound.
 

·
Premium Member
Joined
·
405 Posts
Originally posted by 97GreenStreak3.0@Apr 17 2004, 06:11 PM
My SHO had "glasspack mufflers", basically straightpipes, put in by the previous owner. Would you then suggest taking them out and having some sort of actual muffler welded on?

Sorry for the hijacked thread
Speaking from the SHO perspective, any muffler changes are only for the "sound" factor, and not because a n/a SHO will show any noticeable gain (nor really any gain on the dyno, for that matter.......less than 5 HP is within the range of testing error)).

I had glasspacks on the '95 MTX SHO that I previously owned. Sounded fine with a big resonator. The car was slow in the 1/4, but it already had the mufflers when I bought it.....can't say whether it was due to the mufflers or not......but it was the slowest of the three V6 MTX SHOs that I've owned (and it had less than 100K miles on it).
 

·
Registered
Joined
·
375 Posts
Discussion Starter #9
ok, so would putting on a high flow cat, (where would i get one and how much)
putting on some mufflers, (intrested in the straight mufflers with no restrictions, and some sweet a** chrome tips to finish it off, will that not only hopefully look awsome, sound good, and whatever gains i can get????
jorsh

poll- which should i do, 40 series mufflers or just no ristrictions at all mufflers????
 

·
Premium Member
Joined
·
10,022 Posts
Originally posted by Ron Porter@Apr 17 2004, 04:00 PM
In any case, the cat is not a performance impediment. In fact, on a basically stock motor, the whole exhaust system is not a real impediment. Mufflers are changed (for SHO folks) primarily for the sound factor, and the performance gain (if any) is negligible.
Are you telling me that the stock manifold exhaust headers are not a restriction??? And that Cats aren't either???? allowing the air to flow better through the exhaust definately has a performance effect on the engine.

Cats restrict flow alot, but I would not remove them. Plus, don't the duratecs have 3 cats, or is that just the SHO's? I know that the vulcans have two.
 

·
Premium Member
Joined
·
405 Posts
Originally posted by silvapain+Apr 18 2004, 01:38 PM-->QUOTE (silvapain @ Apr 18 2004, 01:38 PM)
<!--QuoteBegin-Ron Porter
@Apr 17 2004, 04:00 PM


In any case, the cat is not a performance impediment. In fact, on a basically stock motor, the whole exhaust system is not a real impediment. Mufflers are changed (for SHO folks) primarily for the sound factor, and the performance gain (if any) is negligible.
Are you telling me that the stock manifold exhaust headers are not a restriction??? And that Cats aren't either???? allowing the air to flow better through the exhaust definately has a performance effect on the engine.

Cats restrict flow alot, but I would not remove them. Plus, don't the duratecs have 3 cats, or is that just the SHO's? I know that the vulcans have two. [/b]
In speaking of SHOs, no, the stock exhaust manifolds are NOT an impediment, nor are the cats. The cats aren't an impediment in virtually every engine out there.

Your comment about "allowing the air to flow better through the exhaust definately has a performance effect on the engine" is true.....if you mess with your exhaust, you have a greater potential to LOSE power than to GAIN power!!

Things that you read in magazines about engines that are over 5 liters, or have serious power adders like blowers or turbos, simply do not apply to small engines in heavy cars like Tauri......and especially Tauri with automatic transmissions.

It is very easy to open up the exhaust too much and lose torque throughout the rpm range. Dual exhausts don't work on either the V6 or V8 SHO engines, and as I expalined above, my V8 SHO fell on it's face when I removed the mufflers. When guys run catless y-pipes on V6 SHOs, they also lose torque.

The "best" exhaust mod for a V6 SHO is getting a better y-pipe on the MTX because of the very poor design of the rear bank pipe as it enters the "Y" at a 90-degree angle. Minimal power is gained by going with other catbacks, etc.

I am not familiar with the layout of the Vulcan or Duratech exhausts, but I doubt that they would be any different than the SHO, and since they have (1) less power to start with, and (2) do not have as broad of an rpm range, I would say that opening up the exhaust would make them MORE susceptible to torque loss. Sure, you may pick up a couple of HP at the very top of the rpm range, but if you lose midrange torque, the car is effectively slower than before.

I will stay with the same advice that works for SHOs. Change your mufflers to get some sound, but don't expect power gains.

The V8 SHOs have three cats.
 

·
Premium Member
Joined
·
10,022 Posts
1. Duratecs have just as much RPM range as the SHO does.
2. The vulcan manifolds are HORRIBLE.
3. I do not pick up my knowledge from magazines. Nor do I assume that what is
good for a Forced Induction engine is good for a Naturally Aspirated one.
4. You only lose performance if you go too big on the exhaust and cause the
exhaust velocity to drop. Your EGT will fall, and then you will have to push
large amounts of cold air out the pipe. I understand that.
5. I totally agree that a muffler shangeout will never add any Hp to an otherwise
stock engine.
 

·
Registered
Joined
·
746 Posts
Originally posted by 93taurusSX@Apr 17 2004, 06:43 PM
From a purely performance standpoint, straight through, free flowing mufflers are better than Flowmasters. The flows use a series of baffles that will impede the path of the exhaust gas, instead of insulation material wrapped around a mesh pipe.
most definitly true... look at magnaflows or dynomax mufflers. they are cheaper(i think), they sound better IMO, and they flow lots more air than a flowmaster.
 

·
Premium Member
Joined
·
405 Posts
Originally posted by mikehawk+Apr 19 2004, 05:31 PM-->QUOTE (mikehawk @ Apr 19 2004, 05:31 PM)
<!--QuoteBegin-silvapain
@Apr 19 2004, 09:46 AM
1.  Duratecs have just as much RPM range as the SHO does.
No they don't. Stock duratec shift points are just under 6kRPM, IIRC SHO's rev up to 7k or 7500RPM. [/b]
Yes, the SHO power peak is at 6K, with redline at 7K. It's been awhile since I drove a Duratec, but I don't believe it was anywhere near that high. The current Duratec peaks at 5,500.
 

·
Registered
Joined
·
375 Posts
Discussion Starter #16
im trying to get the best setup and after reading i think i will just go a high flow cat, new mufflers(not sure where from yet) and some chrome pipes.
 
I

·
Guest
Joined
·
0 Posts
Originally posted by jorsh@Apr 19 2004, 09:24 PM
im trying to get the best setup and after reading i think i will just go a high flow cat, new mufflers(not sure where from yet) and some chrome pipes.
good idea, these guys didnt do anything but argue. I don't know much about exhaust, but I do know that there is very little HP gain if any. I say that if you want to get these mufflers or take of your cat or do what ever you want, the you don't take these guy's advise. I suggest you go out and do what ever you want to do, because it's your car, and you're the one who's got the final say. Who cares what all these other people think? If it's cool to you, and you like it, despite the non-existant HP gains, then go for it.
 

·
Premium Member
Joined
·
10,022 Posts
Originally posted by Ron Porter+Apr 19 2004, 07:36 PM-->QUOTE (Ron Porter @ Apr 19 2004, 07:36 PM)
Originally posted by [email protected] 19 2004, 05:31 PM
<!--QuoteBegin-silvapain
@Apr 19 2004, 09:46 AM
1.  Duratecs have just as much RPM range as the SHO does.

No they don't. Stock duratec shift points are just under 6kRPM, IIRC SHO's rev up to 7k or 7500RPM.
Yes, the SHO power peak is at 6K, with redline at 7K. It's been awhile since I drove a Duratec, but I don't believe it was anywhere near that high. The current Duratec peaks at 5,500. [/b]
My vulcan gets higher than that.
 

·
Premium Member
Joined
·
405 Posts
Originally posted by silvapain+Apr 19 2004, 11:21 PM-->QUOTE (silvapain @ Apr 19 2004, 11:21 PM)
Originally posted by Ron [email protected] 19 2004, 07:36 PM
Originally posted by [email protected] 19 2004, 05:31 PM
<!--QuoteBegin-silvapain
@Apr 19 2004, 09:46 AM
1.  Duratecs have just as much RPM range as the SHO does.

No they don't. Stock duratec shift points are just under 6kRPM, IIRC SHO's rev up to 7k or 7500RPM.

Yes, the SHO power peak is at 6K, with redline at 7K. It's been awhile since I drove a Duratec, but I don't believe it was anywhere near that high. The current Duratec peaks at 5,500.
My vulcan gets higher than that. [/b]
Not really what it can wind, it's the power at the elevated rpms. On the current model, the Duratec peaks 200 HP @ 5,500, with the 207 torque peak @ 4,500. The other 3.0 engines (std @ FFV) have the power peak of 153 @ 5,000, and the torque peak of 186 down @ 3,250.

The Duratec probably has some beans up to 500 rpm or so past the peak, but I suspect the other engines are pretty much all done by not much past 5,000, as the torque curve has probably already been dropping quite a bit with the relatively low torque peak. The engine may wind a bunch more, but there's no point in doing so.
 

·
Premium Member
Joined
·
10,022 Posts
ahh. I think we have been talking about different things the whole time. I have been talking about range, not effective (Hp wise) range.

my fault. But I still say that aftermarket headers can increase performance for the bull. Of course, without actually being able to put any on a bull, I guess it really makes no difference.
 
1 - 20 of 31 Posts
Top