Running w/ dump open- are you faster

[jetmech]

All you fast (11.5 and faster) guys out there, are you running any faster w/ the dump open. Im going to buy a 3" DP and want to know if i should spend the extra 50 on the dump option. Does TSM allow the dump to be open. Thanks
Rich

 

[lordmikef]

i'm definately not one of those fast guys yet,
but i put on the dump pipe and took off about
3 tenths.

14.00 to 13.70

 

[V6 Beast]

I went 6.87 in the 1/8th uncapped... and 6.94 through my dual 3"

Sully

 

[TurboTnZ06]

For what is in my car, I should run low 11's without trying, I just can't drive

I'm running a ATR Dual 3 as well. I don't think the dump has any effect other than sounding cool. I've never run faster with it off, in fact, about 1-2 mph slower, but it sure sounds cool spooling up...if you like attention then get the dump...

 

[azgn]

the dump is easily worth 2-3 tenths on my car.....both in the restriction area and turbo spool......the faster the car, the more difference it seems to make (my exhaust is 2.5"Hooker)

 

[Turbojorge]

Originally posted by jetmech
Does TSM allow the dump to be open.

Nope, you have to have full exhaust no bigger than 3 1/2 coming out behind the rear tires.

I have never ran my car at the track with the dump open, but it sounds cool as sh!t on the street!

 

[TURBO 6]

Woody, That's two to three tenths and two to three mph, right? I have the Hooker too, and I promise to uncap it when I go to the track. Thanks for the heads-up!

 

[azgn]

get ready to turn the boost down....it WILL go up when you use a dump....you may not pick up as much as I do, but just watch the boost gauge

 

[strikeeagle]

Theoretically, an open dump is always faster, because it imposes less pressure drop than does a full exhaust.

In practice, it may or may not be, particularly for cars with exhaust systems having very little pressure drop. For such cases you're probably down to comparing 2 states of tune, not a pound or 2 or 3 at the turbo. The differences can and do result in the corked up car being quicker/faster now and then, but NEVER, EVER on paper...

 

[J Banning]

Depends on what type of cat back you are running. I have some POS 2.5" cat back with dual "turbo" mufflers. I see close to a .2 gain when I unhook it and run just the open downpipe.

I've got two friends that are both running ATR's 2.5" true dual exhaust (running 11.70's - 12.40's) and they've seen no change in ET going from full exhaust to open dump.

Hope that helps.
-Banning.

 

[STP]

Not with my 3.5" system...

 

[buickboy]

No faster running through full exhaust as opposed to opening dump. It is an advantage for me to hear my car running over those other cars that have to have 2 more pistons to even come close.
Mitch