Too good to be true (3" Corsa perf. gain)?

[SlowCreamPuff]

Too good to be true (3\" Corsa perf. gain)?

I was looking at the dyno results for the Corsa 3" exhaust system. Sounds great. But such awesome gain from exhaust only??

Is it real? Or it is more for the look and sound?

If so, maybe that could be my first de'puffing move.

SlowC5 (soon to a.k.a SlowCreamPuff)

 

[SapphireGTS]

Re: Too good to be true (3\" Corsa perf. gain)?

I have the same exhaust. I cant imaging that ANYONE can honestly say that they can feel or see the difference in any exhaust. The corsa looks awesome and sounds awesome.

Im doing headers and high flow cats. I think with the headers, cats, and corsa I may notice a difference.

 

[TorQ Junkie]

Re: Too good to be true (3\" Corsa perf. gain)?

I've had a hard time finding posts on Belanger before and after dyno results. I wonder if the Corsa 18 hp increase is similar to the others on the market or substantially greater. Corsa believes they will perform as good as or better than Belanger with headers upstream, but have not done testing on modified setups yet.

 

[SoCal Rebell]

Re: Too good to be true (3\" Corsa perf. gain)?

With the addition of Belenger headers, hi flow cats & 3" catbacks I picked up a dyno certified 31 RWHP and 41 RWTQ on my 2000 creampuff.

 

[jcaspar1]

Re: Too good to be true (3\" Corsa perf. gain)?

It is funny that with the Borla 3" cat back most people post no gain or actually a loss in HP on Gen IIs when done alone.

 

[BWoodbury]

Re: Too good to be true (3\" Corsa perf. gain)?

Not true at all Jeff. While I did not do a before dyno run. I don't think any Viper could pull my numbers below with just tubes and filters...

 

[jcaspar1]

Re: Too good to be true (3\" Corsa perf. gain)?

Bob,
I quess I based my statement on previous posts I recall like this:

"Dave,
I've got a 2000 GTS that dynoed 412 rwhp with smooth tubes and filters. After the Borla cat-back, I dynoed 409 rwhp (on a different day). So, in my case, the Borla didn't add any horsepower at all.
Ben." From 3/15/01

And the discussion in the Snake Oyl catalog on why going to 3" cat back alone will result in less HP. I guess the Corsa numbers prove that wrong.

I had thought I have heard other examples of the Borla not improving power but couldn't find them.


My 97 GTS puts out 422/457 SAE with tubes/filters so I guess you may have gotten a 4 hp (less than 1%) gain if we both had idenical motors and days. You do have about .9 mph on me so maybe the increase is real (but you are still .25 slower in time

)

 

[Mark Young]

Re: Too good to be true (3\" Corsa perf. gain)?

I'm doing mine in stages, and will be sharing the dyno results here as I do them. The Corsa 3" is going on on the 18th and I'll post the before/after dyno results. Note that Apex has already posted the results for a gen1 RT. This time we'll see what happens on my '99 (currently completely stock).

Later, I'll do the high flo cats, and then the headers. They may get done at the same time for labor costs but if I can I want to do separate install/dyno runs to see just what these mods are doing.

I'll also report on my SOTP feelings, as measured by my finely tuned, calibrated, and sae corrected ****.

 

[JonB]

Re: Too good to be true (3\" Corsa perf. gain)?

There is a LOT of hard data that exhaust mods unlock "cheap"
Horsepower. Esp in a Gen-I.

"The Year Matters" and Gen-II cars, 97-99 a 3" catback unlocks a consistent 20-25 HP. Corsa is a bit less, due to Noise Cancellation Technology that made them famous for reduced drone and resonance.

In a departure from 8 years of "non-committal on mods" advice-giving in Viper Quarterly / magazine, even Herb Helbig in the next issue suggests exhaust mods !

 

[Paul Hawker]

Re: Too good to be true (3\" Corsa perf. gain)?

In addition to HP and Torque gains (Your results may vary) additional benefits to freeing up exhaust is a quicker revving engine, easier heal and toe, ( due to quicker ramp up and easier to hear engine revs) and the better ability to be in touch with your engine auditorily)
Your car will be much more fun as it roars instead of whispers.
It is fun to have some sound with your fury!

 

[SapphireGTS]

Re: Too good to be true (3\" Corsa perf. gain)?

I like this
QUote from Paul Hawker

It is fun to have some sound with your fury!

Good quote

Thats why I did mine corsa

 

[slaughterj]

Re: Too good to be true (3\" Corsa perf. gain)?

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by BWoodbury:
Not true at all Jeff. While I did not do a before dyno run. I don't think any Viper could pull my numbers below with just tubes and filters...

<HR></BLOCKQUOTE>I pulled 424.6rwhp and 472.8 torque with just tubes and filters, so it seems your #s could just be as a result of them...

 

[jcaspar1]

Re: Too good to be true (3\" Corsa perf. gain)?

"Follow the power curve and see what happens where your stock exhaust car falls of, then look at the after market exhaust car. "

Russ,
I hear what you are saying but did you actually look at the dyno curves. The dyno results so far don't show it. If you look at my dyno (in sig) and Bob's, his HP drops off earlier (5400) than mine (5600) without the Borlas. His HP seems higher than mine above 5900 rpm, not droping off as fast. It seems logical that larger pipes from the cat back should improve power (just like larger TB's should increase HP?

) but I won't believe it till I see at least one dyno demonstrating it for the Borla. If there is any increase it has to be very, very little and there is one dyno of the same car that shows a loss!

 

[Bill/APEX Motorsports]

Re: Too good to be true (3\" Corsa perf. gain)?

Russ, less backpressure does not always equal more hp/torque. For instance, put a 5" exhaust system in a Viper and see what happens. Besides being way loud, it'd lose hp. Exhaust scavenging and pulsing has a lot to do with the flow of the exhaust through the pipes, and too large of pipes will kill the velocity.
We've done lots of dyno testing on exhaust systems and haven't seen the Borla ever make as much power as the 3" Corsa.
FYI--we already posted our 3" Corsa dyno numbers on a GenI car and will post them next week for a GenII car. Mark Young ('99 ACR) will post his impressions of the system after he gets some seat time in it.

 

[Russ M]

Re: Too good to be true (3\" Corsa perf. gain)?

While arguably you may not see alot more power according to peak numbers with an exhaust, there is still a very noticible power difference. A good 3" exhaust removes the restriction from the factory unit and allows your engines to continue breething in the upper RPM's. So even though you take the max numbers and say that you make a max of 426 and I make a max of 424, that is far from the whole story. Follow the power curve and see what happens where your stock exhaust car falls of, then look at the after market exhaust car.

And another thing is that unless you do perfect back to back tests you will not see the exact gain on a viper. The cars are way to sensitive to outside conditions. And as corsa seems to have shown their 3" shows 19hp at the wheels and even more torque. And I guarante that a borla makes more power than that unit just because of the less back pressure design, which mainly seems to be due to fewer mufflers.