Help with headers - Page 2

rtusnake · 04-14-2009, 03:06 PM

I picked up a good bit by swapping to a 3 inch exhaust

goofy · 04-15-2009, 07:08 AM

bigger exhaust is better with a supercharger.. dyno results showed me 20 rwhp gain changing x-pipe to h-pipe. then a 80 rwhp gain when i changed the flowmasters to straight thru flow dynomax welded mufflers.. thats an amazing increase.. that same exhaust works really good on my all motor setup.. if your car is stock and x-pipe works great, but i've found by personal experience on a dyno and at the track, h-pipe will flow better with modified engines, and same goes with mufflers, stay away from chambered mufflers..

TheJeanyus · 04-15-2009, 07:11 AM

Quote:

Originally Posted by goofy

bigger exhaust is better with a supercharger.. dyno results showed me 20 rwhp gain changing x-pipe to h-pipe. then a 80 rwhp gain when i changed the flowmasters to straight thru flow dynomax welded mufflers.. thats an amazing increase.. that same exhaust works really good on my all motor setup.. if your car is stock and x-pipe works great, but i've found by personal experience on a dyno and at the track, h-pipe will flow better with modified engines, and same goes with mufflers, stay away from chambered mufflers..

Could you please post the dyno graphs where you gained 100 rwhp from swapping exhaust?

goofy · 04-15-2009, 08:07 AM

they have the dyno results at "appalachian performance" in black mountain, nc.. ph#828-664-9010.. they also have a website.. that's who does all my tuning.. they couldn't believe it either.. thats all i changed when we re-dyno'd it.. ended up pegging maf meter, had to upgrade to 90mm lightning maf, because the air flow was so much greater.. you probably wouldn't see as much hp gain on a na motor.. i also have that supercharger for sale on this website.. running all motor now.. trying to get a mud truck set up to race soon..

goofy · 04-15-2009, 10:05 AM

here's the graphs

goofy · 04-15-2009, 10:13 AM

started at 350 rwhp.. changed exhaust 431 rwhp first pull before tune.. have to change maf to 90mm to get more.. pegs stock 80mm..

QWKSNKE · 04-15-2009, 03:58 PM

Quote:

Originally Posted by goofy

bigger exhaust is better with a supercharger.. dyno results showed me 20 rwhp gain changing x-pipe to h-pipe. then a 80 rwhp gain when i changed the flowmasters to straight thru flow dynomax welded mufflers.. thats an amazing increase.. that same exhaust works really good on my all motor setup.. if your car is stock and x-pipe works great, but i've found by personal experience on a dyno and at the track, h-pipe will flow better with modified engines, and same goes with mufflers, stay away from chambered mufflers..

interesting you picked up that much on the exhaust at your current power level. I know power can change dramatically with exhaust selection but it seems to mostly happen when making 600+ rwhp. Those flowmasters must have been clogged up.

To me it is REALLY interesting that you picked up 20 with the h over the x. Everything I have ever seen showed x-pipe making more power, especially in the upper rpm.

350 rwhp seems kinda low on a blown 4.6. Were you running lower than 10 psi of boost

goofy · 04-15-2009, 04:41 PM

350 rwhp is when i had flowmasters on.. went to 431 when changed to dynomax straight thru mufflers.. after tune 450.. maf pegged and wouldn't allow any more hp, car would just cut off.. would of had more with bigger maf.. and remember i have an automatic transmission.. you won't show as much rwhp with and automatic as you would a 5 speed due to parasitic loss.. stock was only around 230 rwhp before we added supercharger and cams.. and a convertible is heavier than a coupe..

SilverBack · 04-15-2009, 05:08 PM

I'm not following this.....How does a car being convertible or coupe affect dyno numbers?

TheJeanyus · 04-15-2009, 05:36 PM

Is the exhaust the only thing that was changed? Like QWKSNKE said, those kind of gains from swapping to larger exhaust are usually only seen on 600+ rwhp cars.

Was the weather different on the various trips to the dyno?

04-14-2009, 03:06 PM	#11
rtusnake Halfshaft Killer Join Date: Mar 2005 Location: The Kingdom Posts: 3,910	I picked up a good bit by swapping to a 3 inch exhaust __________________ 03 Cobra 06 F250 (\__/) (='.'=) (")_(")

04-15-2009, 10:05 AM	#15
goofy Junior Member Join Date: Apr 2009 Posts: 26	here's the graphs Last edited by goofy; 05-30-2009 at 07:32 AM.

04-15-2009, 04:41 PM	#18
goofy Junior Member Join Date: Apr 2009 Posts: 26	350 rwhp is when i had flowmasters on.. went to 431 when changed to dynomax straight thru mufflers.. after tune 450.. maf pegged and wouldn't allow any more hp, car would just cut off.. would of had more with bigger maf.. and remember i have an automatic transmission.. you won't show as much rwhp with and automatic as you would a 5 speed due to parasitic loss.. stock was only around 230 rwhp before we added supercharger and cams.. and a convertible is heavier than a coupe.. Last edited by goofy; 04-15-2009 at 04:46 PM.

04-15-2009, 05:36 PM	#20
TheJeanyus Administrator Join Date: Dec 2004 Location: Huntsville, AL Posts: 14,774	Is the exhaust the only thing that was changed? Like QWKSNKE said, those kind of gains from swapping to larger exhaust are usually only seen on 600+ rwhp cars. Was the weather different on the various trips to the dyno? __________________ 1998 Mustang GT Coupe - World's Slowest Racecar 2005 Toyota 4Runner SR5 V8 2013 Volkswagen Jetta Sportwagen TDI

04-15-2009, 07:08 AM	#12
goofy Junior Member Join Date: Apr 2009 Posts: 26	bigger exhaust is better with a supercharger.. dyno results showed me 20 rwhp gain changing x-pipe to h-pipe. then a 80 rwhp gain when i changed the flowmasters to straight thru flow dynomax welded mufflers.. thats an amazing increase.. that same exhaust works really good on my all motor setup.. if your car is stock and x-pipe works great, but i've found by personal experience on a dyno and at the track, h-pipe will flow better with modified engines, and same goes with mufflers, stay away from chambered mufflers..

04-15-2009, 08:07 AM	#14
goofy Junior Member Join Date: Apr 2009 Posts: 26	they have the dyno results at "appalachian performance" in black mountain, nc.. ph#828-664-9010.. they also have a website.. that's who does all my tuning.. they couldn't believe it either.. thats all i changed when we re-dyno'd it.. ended up pegging maf meter, had to upgrade to 90mm lightning maf, because the air flow was so much greater.. you probably wouldn't see as much hp gain on a na motor.. i also have that supercharger for sale on this website.. running all motor now.. trying to get a mud truck set up to race soon..

04-15-2009, 10:13 AM	#16
goofy Junior Member Join Date: Apr 2009 Posts: 26	started at 350 rwhp.. changed exhaust 431 rwhp first pull before tune.. have to change maf to 90mm to get more.. pegs stock 80mm..

04-15-2009, 05:08 PM	#19
SilverBack Senior Member Join Date: Jun 2008 Location: Pell City, AL Posts: 418	I'm not following this.....How does a car being convertible or coupe affect dyno numbers?