Not at all. I'm just tired of seeing wrong info. Saying a 3" system has no benefit over a 2.5" system is wrong. Say what you want.
TTI Exhaust
- Thread starter directconnection340
- Start date
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I cannot imagine putting a 3" system in myself with car on cribbing. MAYBE with a hoist, but I highly doubt it.
TheRacerDave
Well-Known Member
I understand you are not making over 600 HP and are not necessarily looking to make the most power, but here's a scientific look at the exact question: The Power of 2.5 vs 3 inch exhaust
The short answer is you won't lose much with 2.5 inch, and it may be easier to install and more "livable" on the street without sacrificing much at the strip - depending of course on what your HP level is.
I wouldn't go to 2.5 if I already had 3", but I'm a "horsepower over everything" maniac.
The short answer is you won't lose much with 2.5 inch, and it may be easier to install and more "livable" on the street without sacrificing much at the strip - depending of course on what your HP level is.
I wouldn't go to 2.5 if I already had 3", but I'm a "horsepower over everything" maniac.
Hay, I never said it was easy. LOL
It's like saying "Imma cut 2" off my dick cause I think it's too long". If you already got it, use it.
ir3333
Well-Known Member
Interesting...look a little closer, around 4000 they are the same and below 3500 the 2.5" has higher hp and torque!
My last 340 shifted at 4500 and went through the traps at 4500 at 100mph with 3.23 gears..
My last 340 shifted at 4500 and went through the traps at 4500 at 100mph with 3.23 gears..
340sFastback
Well-Known Member
Fair question, I did not measure back pressure. When I said no back pressure I was referring to the straight through mufflers. I would imagine if enough volume of air tries to get pushed through there then my claim might be false.
TheRacerDave
Well-Known Member
Yeah, at low rpm it's better with the 2.5. I just never lived there since I launched my 340 at 6800 (stick car), shifted at 7000, and went through the traps at 7400. Different world. I'll go back to the racer's forum now. Carry on
missing linc
Loose nut behind the wheel
I ran a full 3 inch TTi system on my 1970 Dart, mild 360/727, and I bought the TTi polished tips. Installed the full system from the TTi headers back in my garage, on jackstands on a Saturday afternoon. No helper, just me and mostly hand tools. The old system was a 2 inch that looked like a pea shooter when it was side by side with the 3 incher. Never regretted it for 1 second, sound was amazing and increase in low end torque was huge. I never bothered to uncorked the headers at the track after that and went consistent 13.80s at 100 mph with 3.23 gears.
Yes, it is a tight fit, but well worth it IMO.
Yes, it is a tight fit, but well worth it IMO.
ir3333
Well-Known Member
nice numbers for 3.23 gears...what were your engine specs? My 340 was very low on hp and actually ran 14.05 at 98.5. Much faster than it should have been
missing linc
Loose nut behind the wheel
Engine was .040 over, basic E58 with a 68 340 4 speed cam, double roller timing chain, Mopar high volume water pump, Air Gap intake with a 750 Edelbrock performer carb, 340 clutch fan, stock Mopar electronic ignition. Never had it on a dyno, but the numbers suggest it made around 330 to 350 hp. Those 13.8 passes were on drag radials at 19 psi. Best ever was 13.78.
I went from 2.5 to 3" with my Ford truck, Gladys. Made a huge difference everywhere in the rpm range. I never wouldda believed it. The biggest place? With your foot "just barely" on the gas enough to keep it goin down the road. All I have to do is literally put my big toe on the gas. lol
ir3333
Well-Known Member
Mine was a lo compression 73 cast crank 340.1.88 intakes and a small .204/.214 duration cam. stock 2 1/4" exhaust to silent 22" mufflers and 1 7/8" tailpipes. I doubt if it was much more than 250 hp. But it had strong bottom end. I never raced it but the fellow i sold it to took it to the track once and made 3 or 4 passes. just put it in drive, feathered it to full throttle or it would just burn the 21570r 14's. His best was 14.05 at 98.5 mph
Well, I have a 2.5 inch TTI X-pipe system and TTI headers on my 67 Barracuda with a mild 360 (stock replacement cast pistons .090 in the hole at TDC, MP 761 cam with 270/272 duration and .450/.455 lift, unported Indy LAX heads, RPM Air Gap intake, 3310 Holley, 3.55 gears, 11 inch converter, Nitto 275/60/15 drag radials. Ran 13 zeros at 106 through the mufflers last spring.
How much faster would it be with 3 inch exhaust system? I'm thinking a better converter and a hotter cam would make more difference than a 3 inch exhaust system, but I obviously have not tried it to see. Yet.
How much faster would it be with 3 inch exhaust system? I'm thinking a better converter and a hotter cam would make more difference than a 3 inch exhaust system, but I obviously have not tried it to see. Yet.
Maybe it's my browser, but I can't see pics in either of your posts?
directconnection340
Well-Known Member
It’s advertised in the section “for Sale” under mechanical parts. I’ve checked it several times. If you can’t see it I would be happy to send you the pics to you if you would send me your email
Thanks
Keith
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