Installed Power Flo [Archive] - LS1GTO.com Forums

Scott

12-13-2004, 08:21 PM

LSX Performance

12-13-2004, 08:43 PM

Hows the drone at 60 if any?

CMNTMXR57

12-14-2004, 06:05 AM

I would imagine none because my Loudmouth is minimal.

It's under acceleration it's loud. Cruising it's noticable but not overpowering.

And yea, thank you GM for applying the flange style unbolt and unhang system they brought over from the trucks. Makes life sooo much easier. :D

Scott

12-14-2004, 08:26 PM

Hows the drone at 60 if any?

Drone is not bad. I only notice it up to 2500 rpm under light to medium acceleration. I have a M6 so on anything above 60 is close to sounding like stock. I have had to get use to the extra noise.

Gremlyns Garage

12-14-2004, 09:12 PM

I don't feel much improvement in performance. But it sounds great. And the 3" tips looks awsome.

These days, sports cars shouldn't gain much from cat-back replacements without forced induction as well. Restriction come mainly from cat, and pre-cats if you have them, I'm not entirely familiar with your engines just yet :D

CMNTMXR57

12-15-2004, 06:19 AM

rednred

12-15-2004, 07:01 AM

Real questions here (not flames).

We have true duals so we have 4.5" of pipe before and 4" of pipe after mufflers. Doesn't that provide sufficient flow -- at least for cars that are not highly modified elsewhere?

Also where is crimping the worst -- i.e. what parts would benefit most from replacement?

Finally, would it be worthwhile to replace the plugged H with an X without doing much else?

btw -- CMNTMXR57: I traded a forest green gtp for my gto...do still miss that one from time to time.

The piping on this car is extremely restrictive. It isn't the cats or the muffler necessarily. Although they aren't on the same level as an aftermarket unit, the stock cats, resonators, and mufflers flow pretty well.

It's the 2.25" diameter piping into the mufflers that are crimped and flattened in several places, then the 2" out that kill the stock system.

CMNTMXR57

12-15-2004, 07:09 AM

2.5" is optimum really despite having true duals. Especially if you plan for bigger things later on.

The crimping is under the floorpan between the resonators and before the mufflers.

I'm loving this GTP for it's "spritefullness" and all it's gizmos, but the creaky interior is driving me nuts and I find the gas gauge moves too quickly. It also get a slight less MPG around town than my Olds 88 did. Granted the Olds didn't make the same level of power but I was loving the 20mpg it got. :D

No ConeSS

12-15-2004, 09:53 AM

Real questions here (not flames).

We have true duals so we have 4.5" of pipe before and 4" of pipe after mufflers. Doesn't that provide sufficient flow -- at least for cars that are not highly modified elsewhere?
Actually, 2 - 2.25" pipes doesn't equal 4.5" of pipe, it equals a single pipe of about 3.18" in diameter.

Finally, would it be worthwhile to replace the plugged H with an X without doing much else?
Don't know, good question...

94bamf

12-15-2004, 03:48 PM

The piping on this car is extremely restrictive. It isn't the cats or the muffler necessarily. Although they aren't on the same level as an aftermarket unit, the stock cats, resonators, and mufflers flow pretty well.

It's the 2.25" diameter piping into the mufflers that are crimped and flattened in several places, then the 2" out that kill the stock system.

Good points, I don't know how much time you guys have spent looking at the stock exhaust system, but the system is not 2.25 from the manifolds to the mufflers. The pipe coming off the manifolds actually looks like 2 inch also, also the inlets and outlets of the first set of converters looks even smaller. After the pipe leaves the first set of converters it swells up to 2.25" Also as you noted the pipes right before the mufflers and after are crimped severly, especially one of the pipes,,,seems like it is smashed down to 1.5 or 1.25.

I think the main reason people are getting little gain from catbacks, is the fact that the converter pipes are just as small up close to the manifold, and especially into the first set of converters. Also I think the mufflers on the car are pretty decent, just small pipe....

I know I will eventually be doing exhaust on mine..... :cool:

GigaHz

12-15-2004, 04:15 PM

Got a sound clip?

Scott

12-15-2004, 08:03 PM

Got a sound clip?

I'll see what I do. I think there is already one on the borad. Do a search useing Power Flo or sound clip.

Scott

12-15-2004, 08:19 PM

These days, sports cars shouldn't gain much from cat-back replacements without forced induction as well. Restriction come mainly from cat, and pre-cats if you have them, I'm not entirely familiar with your engines just yet :D

I was not realy looking for HP gain from the cat-back. Just a diffrent sound. And boy did I get that. I was not sure I lilked it at first. But it's growing on me.

steelerguy

12-15-2004, 08:47 PM

I'll see what I do. I think there is already one on the borad. Do a search useing Power Flo or sound clip.

those clips are pretty distored, so if you can get some clips that would be great.

CMNTMXR57

12-16-2004, 06:14 AM

Good points, I don't know how much time you guys have spent looking at the stock exhaust system, but the system is not 2.25 from the manifolds to the mufflers. The pipe coming off the manifolds actually looks like 2 inch also, also the inlets and outlets of the first set of converters looks even smaller. After the pipe leaves the first set of converters it swells up to 2.25" Also as you noted the pipes right before the mufflers and after are crimped severly, especially one of the pipes,,,seems like it is smashed down to 1.5 or 1.25.

I think the main reason people are getting little gain from catbacks, is the fact that the converter pipes are just as small up close to the manifold, and especially into the first set of converters. Also I think the mufflers on the car are pretty decent, just small pipe....

I know I will eventually be doing exhaust on mine..... :cool:

Yea, I measured my stock mufflers at their inlet and outlets. Not further before (like up by the resonators or cats). There are a couple crimps that kill flow.

Scott

12-16-2004, 08:46 PM

those clips are pretty distored, so if you can get some clips that would be great.

I can't figure out how to post the clip. :banghead: It's to large to attach. If you want to post your e-mail adress I can E-mail to you. It's only about 5 seconds long. Or, if someone can clue me in on how to post the darn thing.

CMNTMXR57

12-16-2004, 08:50 PM

You either have to host it yourself on your own website (if you have one) or send it to someone that does. Or best yet, send it to DY and he can link it in the multimedia section.

5point7

01-21-2005, 12:44 PM

Any clips yet of the Power FLo System? ;)

IBM/M6

01-21-2005, 01:03 PM

drone on highway is around 2200 rpm , which with the m6 is in the 85-95 mph range but when up there who cares . @ 70-75 hardly noticable . I do like the hum rather than the raspy sound it gives off .

Felix C

01-21-2005, 02:26 PM

Not intending to change the thread, but if the factory pipes are crimped here/there and restrictive, why do catback system generate only 8-10rwhp? Or do certain catbacks provide more hp than others?

Crvt Wanabe

02-02-2005, 03:53 AM

Clip yet? I am considering this system! Also, any drone?

Crvt Wanabe

02-02-2005, 04:07 AM

Also^2, do you think it sound much better than stock? Worth 600 bones?

jfulcher

02-02-2005, 04:10 AM

I've thought about why we don't gain more than 8-10 rwhp with this mod - with my LS1 F-bodys which were very similar there was a 2.5 inch intermediate pipe (That the Y-pipe that combined both sides of the exhaust flowed into) which was very restrictive. Just upgrading to a 3 inch intermediate pipe and a more free flowing muffler (or no muffler) would gain you about 10-15 RWHP. If we have 2 2.25 inch pipes, crimped down to 2 2 inch pipes at one point, we effictivley have pretty close to that 3 inches of intermediate pipe the F-body aftermarket catbacks had already - and a pretty free flowing muffler already.. This is why gains are lower than what they are in the F-body LS1 world.. There was a 4 inch exhaust for the f-body, but I don't think it made much of a difference until you started going to heads/cam setups or more..

Crvt Wanabe

02-02-2005, 04:45 AM

The cosra looks like it gained 15hp with a good CAI so I think it is doable!

jfulcher

02-02-2005, 04:55 AM

That CAI gained 8-10 of those HP though.. So the corsa really gained 5 ;)

Crvt Wanabe

02-02-2005, 05:01 AM

I see! Maybe the headers are where the serious backup is. The LT's are getting some great gains!

don taylor

02-02-2005, 05:44 PM

Finally, would it be worthwhile to replace the plugged H with an X without doing much else?

I've wondered about just "unpluging" the H - cut it in half, drill thru each pipe and then either reweld - or install some sort of splice (maybe a pair of flanges so different size interchangeable ports could be tried).

Sounds like a cheap mod that would a). change the exhaust note and b). add afew HP.

Thoughts???

bigjerm69

02-17-2005, 09:28 AM

go with the X noticeably different flow using this setup

sintax

02-17-2005, 11:14 AM

My son and I installed my SLP Power Flo tonite. What a snap that was. We started at about 6:45 And we were going a test drive just before 8:00. I was impressed at how easy it was to install. I don't feel much improvement in performance. But it sounds great. And the 3" tips looks awsome.

Hey Scott,

Just wondering if you'd ever mind showing your car off, I'd love to hear how it sounds in person. I think I remember you being in Southern California. I'm in Corona and am always looking for a good excuse to beat on my GTO so a drive does not bother me.

-Scott (yes another)

sledheadRick

02-17-2005, 05:37 PM

hey guys,

looking at the SLP web site, they show a 71 hp boost with their Long Tube performance package. The package includes high flow cats among other items. Seems like the way to go for bolt on performance. Couple this with a CAI system and you're looking (and sounding) pretty good. :cool:

http://www.slponline.com/view_product.asp?P=29028

rico750sxi

02-20-2005, 10:16 AM

Why didn't you like it at first? Can you decribe the sound until we hear that clip?

TurboManiacal

02-20-2005, 10:49 AM

those clips are pretty distored, so if you can get some clips that would be great.

Hey Peter...yeah...we lost some people this week...so um...I'm gonna have to ask you to go ahead and come on in on Saturday...oh and umm...if you could go ahead and come in on Sunday...that would be great. :hail:

Scott

02-20-2005, 10:58 AM

Hey Scott,

Just wondering if you'd ever mind showing your car off, I'd love to hear how it sounds in person. I think I remember you being in Southern California. I'm in Corona and am always looking for a good excuse to beat on my GTO so a drive does not bother me.

-Scott (yes another)

I sent you a PM. I diden't see this post untill today. Sorry.

ZD1

02-20-2005, 01:50 PM

sledheadRick

02-21-2005, 07:55 AM

Hey Peter...yeah...we lost some people this week...so um...I'm gonna have to ask you to go ahead and come on in on Saturday...oh and umm...if you could go ahead and come in on Sunday...that would be great. :hail:

ha hah ahhahh ahahahha ha :gr_jest: :gr_jest:
I love that movie!!!

Scott

02-21-2005, 08:21 PM

Why didn't you like it at first? Can you decribe the sound until we hear that clip?

The Jury is still out for me. It dosen't sound like a true muscle car to me. It sounds a tad on the Euorpean side. I'm going to see how it sounds with the headers installed. There is a sound clip of a 05 with LT's and Flowmaters on the board somewhere. Now, that sounds awsome to me. Stand by my cat-back may go up for sale soon.

rico750sxi

02-21-2005, 10:04 PM

I also love the sound of the '05 with the LT's and Flowmasters. I may have to get the Flowmaster system. When are the headers going on? I was trying to figure out what exhaust I want so I can buy the headers and catback by the end of the week.

magnumforc

08-16-2005, 06:34 PM

Let's see..straight 3.5" stainless steel pipes from the cats back, mandrel bent and the hell with any muffs or resonators. Seems that worked on my '66 Goat and will work here. Now to get the dude with the mandrel bender to do some favors in return for the cases of cerveza.....without making pretzel shapes of the tubing. Damn..now it looks lika a freaking whiskey still....