What kind of gains did you see out of the catback system? Also is it possiable to use the stock tips instead of the ones triflo offers? Where did you get it from and how much?

Thanks

 

As I recall, my 3" system was supposed to be good for about 10HP and 15-20 ft-lb torque. I did notice a difference but I think it took the computer to relearn some stuff because of the increased flow and reduced backpressure.

The tips come welded at the top and bottom of each of the two tailpipes on the mufflers. The OEM muffler has only one outlet. You could probably fabricate a piece of sheet metal to bend around the twim pipes and paint it black, but I think the tips that come with it look very nice.

I bought my system at my local Corvette parts shop (our club sponsor) and I paid about $1100 including installation 4 years ago.

 

The data B&B sent me showed an increase in peak horsepower from 276 to 287 hp at 5750 RPM, an increase of 11 hp. The biggest gain was 12 hp at several lower RPM's.

Maximum torque increased from 280 ft-lbs to to 295 ft-lbs at 4250 rpm, a gain of 15 ft-lbs.

Basically you gain at least 10 hp from 3250 to 5800 rpm and at least 12 ft-lb of torque from 2250 rpm to 5800 rpm.

This is B&B's data on an otherwise stock LT4. Tests were performed in April & May of 1996 on a Dynojet Model 248E.

 

There won't be too much of a gain. Guys I know have seen no difference in their 1/4 mile times, and that is more believable than a dyno.

The sound is great though, I might get one for my '95.

 

Mr Mojo

Just a question, most cat-back systems talk about a 10 hp gain over the stock exhaust.

Have you seen a gain at the strip on any cat-back system as compared to OEM stock???

Is a gain of 10hp, from whatever mod, big enough to make a measureable gain at the strip??

Just wondering.


[Modified by LT4BUD, 7:01 PM 3/31/2003]

 

Here is my problem, I really want to open up my exhuast i feel that it is holding my cam back right now, however I want it to apprear stock and also want something good qauality and shows gains.

 

With just a catback, I haven't seen anyone say they've had a change, and you know we all expect it.

I will say this, with the stock system, I would trap 108 mostly, an occasional 109 and sometimes 106-107.

I cut the mufflers off and I never trapped above 107 ever again.

I put a Corsa cat back on and I trapped at 108 again, but no gain over stock.

I dynoed 283 at the wheels with the Corsa, I may dyno again with the stock exhaust just to see if there is a difference, but based on my runs at the track, I would say no.

I'm also eventually going to put the Corsa on my '93 which currently is running a stock exhaust to see if any difference is made.

I'm hoping, but I'm not counting on it.

At the track, we've has guys with B&B, Corsa,Flowmaster,SLP,Muff Elims,Power Effects, Side Effects and Borla. All make the car sound better, but we have yet to see a difference. You wouldn't feel 10 hp anyway.

 

I thought I remembered some article on a site or mag or something where they tested all the cat-back systems and tri-flo had the biggest gain? By like 1 or something lol?

I want Tri-Flo, I know MAD sells it for $999.99 now, cheaper than their $1299.99 previous price. Whether there is a horse power difference or not, I sure as hell won't expect to FEEl it :sleep: The sound sure will make you feel faster though.

It's just like when you talk to a ricer and he says he has intake, exhaust and a chip. His magazines say he gained 50 horse power from all that or more, and he'll tell you that to, but you're still ahead 10 car lengths after a 1/4. It's a mental thing, if you want to gain speed, KNOW that it's helping the car, otherwise, buy something which adds a lot. (or all the small things put together :yesnod: )

 

IMO MAD is rarely the place to get the best deal on Corvette parts. They are convenient though.

Some guys in the ZR1 section arranged a TriFlo group purchase a few months back and the price wound up somewhere in the $8xx.00 region.

I wouldn't expect too much difference from a cat-back sytem alone. I didn't feel a performance difference when I put my TriFlo's on but it sure sounded better. I think cat back exhausts are one of those "a few horsepower here and a few more horsepower somewhere else will add up to 15hp things". Get a cat-back and a few other related mods and you will probably get a noticeable difference then. JMO

 

It may not make a huge difference on a slightly stock car but those 3" pipes will sure make a difference when you get up there with cam and heads, longtubes, it all helps to the same goal.

 

and does anybody know what's inside the Triflo's? Are they straight thru or chambered like flowmasters or ????
The BB website no good
I love the BB oval tips. My favorites.

 

I wonder where Raysur is, I figure he has probably researched TriFlo's more than most people around here...

 

The following info was taken from an article in Corvette Fever June 1998 issue.

Exhaust shoot out! By Jim Van Dorn

Dyno results on stock Grand Sport LT4.

HP/TORQ
Stock:
299/307

BB Triflow catback 3-inch:
310/310

Dynomax mufflers only:
304/310

Borla Corvette Challenge cat back 2 3/4 inch:
304/309

Flowmaster cat back 2 1/2 inch:
306/309

Power Effects cat back 2 3/4 inch:
299/308 - flaps in closed position
311/313 - flaps in open position

As you can see the is very little difference between them all especially when you consider cost.


Some interesting comments they had were, "Borla teamed with Doug Rippie Motosports in developing their Corvette Challenge cat-back 2 3/4 inch system. Rippie's original request for the larger-diameter pipe was made when he fitted his mega-horsepower former Lemans engine (600+hp) to a production ZR-1. Rippie later related "We found the 3-inch system was great for horsepower, but (it) lost torque. The 2 3/4 inch system was the best of both worlds.

I have an issue with the above. If that's true why is it the the Triflow 3-inch tested pushed 310 torq and the Borla pushed 309torq. Could it be that they are really refering to how the max torq moves to a lower rpm with the 2 3/4 and moves up higher in the rpm's for the 3-inch? Is this possible?
I can feel a difference in low end torq if i closed the flaps on my PE system. Feels like it has more but maybe it's just available sooner.


They also tested sound levels at 70mph cruise, at idle, interior sound. Let me know if this interest anyone and i'll start a new post with the results. What's interesting is that they don't mention resonance at all. I'm thinking the Cruise @70mph sound level test would be as good indication of how loud the resonance is.
Stock 94
Triflow 107
Dynomax 96
Borla 100
Flowmaster 97
Power Effects 100(Closed) 103(Open)<this turns it into a straight pipe, you can see inside the exhaust.

107 DB is loud for most folks. :eek:
For me open headers use to be not loud enough. :lol:

So bigger is better for horsepower in a modified car I would think. When you have such a high level of power I don't think it makes much difference if you lose let's say 10-20ft pounds of torq for a street car.

[Modified by ConeKLR, 12:54 PM 4/1/2003]


[Modified by ConeKLR, 12:56 PM 4/1/2003]