What H.O. parts for better MPG?

[deepsleep]

Whats the cheapest way to make duals? H pipe connected to two tail pipes? How much is that?

[Lincolnmania]

cheapest is a stock replacement H pipe for the grand marquis, and a pr of wagon tails and a pr of 2" ofset ofset mufflers of choice.......mind you the h pipe and the wagon tails are not cheap here on the mainland.......about 80 for the h and 55 ea for the tails is about the cheapest i've seen here in pa mang

[King_V]

This is very true, when I did my dual exhaust, it was a little more responsive and got like 3mpg more on average than before.

Dang, and you're close to me, so probably dealing with the same set of nightmarish roadways that I am . .

I should probably do this . . stock type duals. Aftermarket mufflers, though.

[deepsleep]

I just took off the Y pipe.It sounds pretty cool but I'll have to see if its too loud.

[gadget73]

taking off too much of the exhaust costs you torque, which usually results in less fuel economy.

[J_vicky]

i was up in westbranch, MI went down a back road and basically bogged in my 89 ltd. and i got on the highway on the way home and my y pipe fell right off, my mpg dropped a fair amount, but ive got duels on her now and shes growling now.

[1987cp]

I hate it when Y pipes fall off. Gets good and loud in the car. I ended up tiptoeing around town for nearly a week before I found the time to attach some new tubing to quiet things down.

[91grandmarquis]

According to the toyota kids at school, with there lifted tacomas, you don't need the Y-pipe just run it off the cat, that of course has been hollowed out.

[gadget73]

You can do that, but you'll notice a loss of low rpm torque and a lot of noise. The exhaust really should be there, at least up to the mufflers, to ensure decent scavenging effect. I'm not so sure removing the mufflers back makes a big difference, but if you unbolt it behind the converters, you will feel it.

[91grandmarquis]

You can do that, but you'll notice a loss of low rpm torque and a lot of noise. The exhaust really should be there, at least up to the mufflers, to ensure decent scavenging effect. I'm not so sure removing the mufflers back makes a big difference, but if you unbolt it behind the converters, you will feel it.

They do it so there pos yota is noticed, because frankly there penises are not large enough and I need to be informed that there is a "large" and I use that term loosely, truck on the way. My car sounds better than, and could take most of there shit. One redneck said and I qoute - "yeah hes got dual 4 barrel carbs on that thing, runs like shit but looks awesome."

[gadget73]

LOL. You need a *lot* of motor to even begin to justify dual quads, and then you have to know what you're doing to get them close to running right. To really make them spot-on you really have to know your shit. I've run dual 1bbl carbs before on a 4 cyl and it was kind of a pain in the ass. I can't imagine how much more annoying a dual 4bbl is with the secondaries and getting all that tuned.

[King_V]

I haven't read very many, but the few articles I've come across about modern triple-2bbl or dual-4bbl setups, with new designs for the intake, etc., all seem to come to the conclusion that a single 4-bbl produces more power overall anyway.

But, for the nostalgia look.....


Anyhoo, I would guess that the reason those results are like that is because of the difficulty of getting an even air-fuel mixture from both/all-three of them.

Someone once told me they were going to make an attempt at 8 1-bbl carbs for a V8 - each with their own entirely isolated runner, etc.

I imagine trying to tune that would be a NIGHTMARE...

[1987cp]

LOL. You need a *lot* of motor to even begin to justify dual quads, and then you have to know what you're doing to get them close to running right.

Interesting dual-quad factoids.

1) Judging from a picture and description that surfaced in a thread at the Corral that some SBFtech guys were making fun of, our old pal turbo2256 is now running dual quads on his Mercury. Still with ported D0OE heads, if I understood correctly.

2) A cousin of my wife's told me a story of swapping his preproduction Quadrabog (he worked for Rochester at the time it was developed) for a friend's dual-AFB setup. Said that after enough twiddling, he actually was able to get that setup working correctly WITHOUT a progressive linkage.

3) Especially for a mismatched combo being tuned by an idiot (like me!), it's not a bad idea to run the smallest carb you feel is acceptable (500cfm AFB in my case), with a preference for old-tech stuff that's relatively forgiving so you can get away with having it tuned by an idiot. I've been hearing recently that once you get into modern-tech carbs with modern-tech heads and camshafts, you can make more power by running a carb that's "too big", and even get better-than-stock gas mileage to go with the power gains, but it's got to be tuned right or the car will fall on its face.

[91grandmarquis]

Yeah weve got a single 4bbl on the gmc, and that is finiky enough just tuning the one, not too hard, just can be an annoyance. I think one kid around here has triple duals on his 1500. I just think they should start with spending money to get the rusted frame fixed first is all. I mean when your body mounts are rusted out and your bed is tilted to one side, the first thing you should do is lift your truck right?

[LTDMike]

I got some stock mustang headers that I'll sell to you for $25