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Dakota Performance
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Mopar318
Dodge Dakota
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10/21/2005
11:07:33

Subject: Some true dual questions.....
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I am going to be getting true duals here soon. I have a 1996 318 auto. I got rear ended and it messed up my split rear setup so I will be getting new exhaust. I went to the shop and they said It would be 400 dollars to bend the pipe from the headers back. That included 2 cats and an X pipe also. I think that is pretty cheap. What exhaust diameter would be the best for this setup? I was wanting to go to 2.5 inch pipes. I will be doing a swap to a to a 390 stroker pretty soon so I would like to have the exhaust done right before hand.



gen1dak
Dodge Dakota
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10/21/2005
12:14:51

RE: Some true dual questions.....
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dual 2.25" for stock 318 would be a bit much. Dual 2.5" for the 390 stroker is good.



Mopar318
Dodge Dakota
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10/21/2005
13:06:53

RE: Some true dual questions.....
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Alright, So I think I will go with the 2.5 so I dont have to redo the exhaust when I install the stroker. How much would I lose with this setup on my truck with the 318? How loud would it be with true duals. I only heard one dakota with true duals but it was a 3.9 and sounded like crap. I want it to scream.

Also gen1dak,

Do you have any for building the 390 stroker? What manifold, throttle body, injectors would be the best. I have a KRC 210 cam with 1.6 rockers. I was thinkin about going with the M1 2Bl and a 52mm throttle body with my stock injectors. I have the 1.92 R/T heads.



gen1dak
Dodge Dakota
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10/22/2005
01:14:36

RE: Some true dual questions.....
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The 318 will lose some low-end power (not huge, at worst, 8-10 ft/lbs down low) from the lower back pressure of the 2.5" pipes. Yes, the loss of back-pressure. Street engines usually like a little back-pressure to help scavenging on the exhaust side. As you mentioned, it'll be ready for the stroker. It'll sound great. The 3.9 isn't a good one to compare to. While it shares the 318's port dimensions, it has an odd-ball firing arrangement. Contrary to popular myth, it isn't simply a 318 with 2 cylinders chopped off. It's a bit more complicated than that. Anyway, having some of the firing impulses at the 54 degree mark upsets the rythm and it's also lacking two firings. With the 318 having 8 firings, with each one evenly spaced at 45 degrees (crank rotation) makes for a much better, classic American V8 rumble. The volume depends on the mufflers. Dual glasspacks tend to be pretty loud. Various Flowmasters...well, opinions vary. I ran dual "turbo" mufflers.... that's what they called them, though it had nothing to do with turbos, and it was perfect. That was on a 318-powered '69 Charger with headers and true duals (2.25").
The intake and TB you mentioned are good, and the stock injectors should handle this setup. A couple things. On the PCM. Since this is a stroker engine, you shouldn't shoot for 6,000 rpm shift points. Your stock PCM will cut off around 5200rpm. It's not that the stroker can't rev, it's just that it's happier not screaming past 6 thou. It's not gonna blow apart. I'm speaking of best power production. A performance PCM will add a quicker ignition curve, but this will most likely force use of premium gas. You could also go for a custom re-programming. The performance unit will cut off at 6 thousand rpms, so it's a toss-up. You'll wanna limit your max rpm to around 5500. Again, it'll pull higher, but is happier grunting out in the midrange.




bigdave
Dodge Dakota
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10/22/2005
01:23:05

RE: Some true dual questions.....
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What about the O2 sensors, will the duals mess up the readings? I too am thinking about doing duals but was concerned about that.
Thanks for any replys, Dave



Mopar318
Dodge Dakota
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10/22/2005
02:49:05

RE: Some true dual questions.....
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I will have one exhaust pipe with a 02 bung before and after the cat. The other side will be unmoniterd. Im not sure how it would work if you had precats. If you have a 95 (pre OBD II) or earlier truck you wont have to worry at all since there is no sensor after the cat.



Mopar318
Dodge Dakota
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10/22/2005
15:35:37

RE: Some true dual questions.....
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Once I get the true dual setup I will have a JBA Y-pipe with a 2.5 inch pipe feeding into a carsound high flow cat left over. How much could I get out of this. It only has about 1000 miles on it. Everything still looks brand new. I was hoping to get around 200$ on ebay. What do you think? I could also throw in my silverline stainless steel exhaust tips.



gen1dak
Dodge Dakota
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10/22/2005
21:02:04

RE: Some true dual questions.....
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Dunno. I mean, you start talkin' "slightly used".....know what I mean? Exhaust pieces can be difficult to get your money out of. Yeah, I guess you could get $200 out of it.



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