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jdb
Dodge Dakota
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11/29/2003
13:35:03
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 Subject: More power
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I've got a 97 5.2 4x4 RC Dakota. I want more power. Its my understanding that due to the tall roller lifters the push rod angle is sever enough that chrysler decided to limit the rpm of the engine to 5000 rpm. Since they were truck engines anyway all the parts were designed for low end power.
I know the heads don't have the best flow numbers and have a large obstruction in the intake due to the enlarged push rod hole, but they make good power on the crate engines. I know the exhaust system is very restrictive, but it doesn't seem much worse than the competition.
I recently took a look inside one of those barrel intake manifolds and realized that it has to be the biggest cork in the engine. I don't see any way to modify those things to get them to flow.Is the M-1 the only alternative? That intake doesn't have any ram effect at all. It has to kill low end.
Has anyone tried a M-1 with a K&N type air intake? I can give up a little low end, but don't want to kill it completely.
I don't know much about computers, I'd like to get something that can raise the rpms and top speed and still run regular gas. Any suggestions?
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slow r/t man
Dodge Dakota
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11/29/2003
15:10:42
| RE: More power
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The entire package is tuned for torque. The push rod angle is the same as a 68 340 or any other SB Mopar. Its not that bad. Sounds like you need a Mopar HP computer. It raises the shift points, spark advance and changes the fuel tables. Keep the intake, get a larger Throttle body. Get some harland sharp rocker arms (1.7 ratio) a 180 degree thermostat, put a bottle of water wetter in the coolent. Relocate the IAT sensor.
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gen1dak
Dodge Dakota
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11/29/2003
20:50:23
| RE: More power
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The redline for 318's has always been 5,000 rpm or less because it's always had very mild cam specs. If it were due to pushrod angles, we'd never have seen the 340 nicknamed "Baby Hemi" for its willingness to peg 6,300+ rpm. Magnum 318's are the first to have a cam with more than .4 gross valve lift, but as already stated, it, and the 360 Magnum were tuned to be LOW RPM torque engines for towing, etc. Ram tuning means a bit less when MPFI is used, especially when low rpm torque is the issue. Air is much easier to bend when fuel dropout is not a factor. Magnum Performance and Hughes both modify the Beer Keg intake for higher rpm power. If you want performance, and do the 180 thermostat, headers, exhaust, you'll need more fuel eventually. The larger throttle body is good. If you want to run regular gas, in addition to the MP computer, you'll need the MSD 6BTM to limit ignition advance. You'll still have a fatter fuel curve. Oh, the Magnum heads flow better than the vaunted 340 "X" heads. Ported "X" heads will outflow stock Magnums, but they fall below the 75% intake/exhaust flow balance. Even ported Magnums never drop below 75%. The Magnums achieve this with smaller intake valves than the 2.02's in the "X" head, so don't sweat the intake port intrusion...it's smooth, and will flow. If you're going with an M1, you're right there, so get a better cam. The stocker will have decent lift with 1.7:1 rockers, but it's pretty lazy in the cam timing dept. Naturally, get HP springs. Also, I'd go M1 just to get rid of that pesky intake belly pan gasket.
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slow r/t man
Dodge Dakota
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11/29/2003
22:15:24
| RE: More power
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Gen1dak you are right on target as usual.
""Ram tuning means a bit less when MPFI is used, especially when low rpm torque is the issue. Air is much easier to bend when fuel dropout is not a factor."" that is a good point , I wound like to add to it alittle.
A fuel injected motor does not depend and vaccum to draw fuel into the motor,it is esentialy "thrown" in by the injectors. It also does not depend on an external device to atomize the fuel. Injectors do this as well. You can get away with a MUCH larger cam than otherwise possible in a street car for this reason.
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Fish
Dodge Dakota
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11/30/2003
14:09:02
| RE: More power
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Gen1Dak
When you talk about getting more fuel, I already have the M-1, a 50mm TB, 1.7's, full exhaust, FIPK, and will get the computer here soon, should I get the 6BTM and larger injectors? I have the Five-O-Motorsports 19lb/hr Gen2's. Mine is also a 5.2. The ignition was either going to be a 6-Offroad or the 6-BTM.
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Nopar
Dodge Dakota
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11/30/2003
15:28:12
| RE: More power
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Your mods have nothing to do with introducing more fuel. The PCM automatically compensates for your mods to maintain the A/F within EPA standards for emissions. These engines are fuel injected for emissions reasons not for power.
If you want more fuel either program your own custom fuel controller or bolt on a carb.
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slow r/t man
Dodge Dakota
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11/30/2003
16:40:14
| RE: More power
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Bye using a 180 degree thermostat and relocating your iat sensor you can richen the mixture alittle
but as far as fuel goes too little to late is way better than too much too soon
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