2.5 vs 3.0 dual exhaust 426 Hemi
#2635218
03/21/19 01:18 PM
03/21/19 01:18 PM
|
Joined: Mar 2019
Posts: 36 Aubigny, MB Canada
69 F5 R/T
OP
member
|
OP
member
Joined: Mar 2019
Posts: 36
Aubigny, MB Canada
|
Where is the cross over from 2.5" to 3" Dual exhaust on a 426 B-body, full weight street driver?
Is it at the typical 5-550HP range, or does the Elephant gain from dual 3" even in stock form?
Bringin Back the Iron!
|
|
|
Re: 2.5 vs 3.0 dual exhaust 426 Hemi
[Re: jerseybud]
#2635288
03/21/19 04:26 PM
03/21/19 04:26 PM
|
Joined: Aug 2003
Posts: 43,243 Bend,OR USA
Cab_Burge
I Win
|
I Win
Joined: Aug 2003
Posts: 43,243
Bend,OR USA
|
About 15 years ago, car craft did a dyno test on a 70 super bee 440 comparing 2.5 to 3 duals- the 3 duals gave very significant gains. I assume a engine with even better flow would benefit as well (like a hemi) I've done at the track testing on exhaust systems, huge gain removing a 2.5 inch system with 2.5 turbo muffs, .9 ET and right at 9 MPH gain The next street car I built I had a 3.0 inch complete system with the muffs mounted behind the rear end housing and it only picked up .020 ET (two hundreds)and .2 (two tenths) MPH by removing it at a 1/8 mile track Any thing you can do to improve airflow, in or out, will result in better performance
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
|
|
|
Re: 2.5 vs 3.0 dual exhaust 426 Hemi
[Re: 69 F5 R/T]
#2635397
03/21/19 10:31 PM
03/21/19 10:31 PM
|
Joined: Jan 2003
Posts: 15,976 Chilliwack B.C. Canada
RUNCHARGER
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 15,976
Chilliwack B.C. Canada
|
When I uncorked by Challenger with 2.5 exhaust it would pick up .4 every time in the quarter, 426 with hooker headers and a slight .510 lift hydraulic cam. Everything else stock. Don't even bother with 2.5 inch.
Sheldon
|
|
|
Re: 2.5 vs 3.0 dual exhaust 426 Hemi
[Re: RUNCHARGER]
#2635532
03/22/19 11:18 AM
03/22/19 11:18 AM
|
Joined: Mar 2019
Posts: 36 Aubigny, MB Canada
69 F5 R/T
OP
member
|
OP
member
Joined: Mar 2019
Posts: 36
Aubigny, MB Canada
|
Some interesting posts, Thanks all!
I think the bro is looking at the TTI 3" system with X pipe.
Anyone have any experience with TTI exhaust systems? Feedback?
Bringin Back the Iron!
|
|
|
Re: 2.5 vs 3.0 dual exhaust 426 Hemi
[Re: BSB67]
#2635646
03/22/19 05:14 PM
03/22/19 05:14 PM
|
Joined: Jun 2006
Posts: 5,164 CT
GTX MATT
master
|
master
Joined: Jun 2006
Posts: 5,164
CT
|
In my experience really depends on the mufflers, if you run turbo mufflers it probably really doesn't matter - both sizes will suck power out of your setup. They will neck down inside to 2.5 inch or less, and you will give up noticeable power.
Straight through mufflers you likely won't lose much with either system, you will probably give up a little with 2.5 inch pipes.
Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street
|
|
|
Re: 2.5 vs 3.0 dual exhaust 426 Hemi
[Re: Dave Hall]
#2635853
03/23/19 10:25 AM
03/23/19 10:25 AM
|
Joined: Mar 2019
Posts: 36 Aubigny, MB Canada
69 F5 R/T
OP
member
|
OP
member
Joined: Mar 2019
Posts: 36
Aubigny, MB Canada
|
My TTI 3" system on my BB400 Dart Sport is cool. I bolted it all up myself. Fit needed some tweaking here and there and it still has some rattle issues that I need to sort out. Muffler guy with a big pry bar? All of the sound is out the back of the car but it's still a little loud for my taste. This has the quietest (I'm told by TTI) dynomax mufflers they sell. It is coming out of huge by extra large TTI headers. This is weak, little, high gear burnout when I first got it running. It gives you an idea of the sound. TTI 3" SOUND Nice!
Bringin Back the Iron!
|
|
|
|
|