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2.5L/3.7L/3.9L Engines Questions regarding the I4 and V6 Engines

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  #1  
Old 06-01-2007, 09:08 PM
swedish_dakota swedish_dakota is offline
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Smile high mileage v6's

Hello all,

I have read all the threads on the mods and changes that can be made to the V6 (I have the 3.9 magnum) and I guess my question is whether its smart/worthwhile to do some of these mods on a higher mileage engine? Mine has gone 124k + and runs very nicely but I have been told in the past that modifying older engines unless you completely rebuild them can be a problematic thing. What do you reckon?
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  #2  
Old 06-02-2007, 12:43 AM
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I have 196k on mine, but I don't plan on going any further than the exhaust I already have. I might add an intake or just some other minor things
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  #3  
Old 06-02-2007, 02:20 AM
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Just stay away from big power adders. I would definitely not do NOS or a supercharger, but lightly modifying it to be a more fun and efficient vehicle: where's the harm in that?

Also those Bosch 4's are a waste of money, electricity takes the path of least resistance, and I willing to bet all four contacts aren't the same resistivity. I just changed from Bosch to autolite 3923s and starting using 89 octane and with a 145,000 mile motor got 215 miles out of half a standard equipment tank.
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  #4  
Old 06-02-2007, 03:41 AM
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My Gen1 had 147,000 miles on when I did my Engine Swap, My 1992 3.9 has over 128,000 miles. The Gen2 has had a couple hiccups along the way but its never been opened up.
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  #5  
Old 06-02-2007, 06:25 PM
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Quote:
Originally Posted by sailsurf7713
Just stay away from big power adders. I would definitely not do NOS or a supercharger, but lightly modifying it to be a more fun and efficient vehicle: where's the harm in that?

Also those Bosch 4's are a waste of money, electricity takes the path of least resistance, and I willing to bet all four contacts aren't the same resistivity. I just changed from Bosch to autolite 3923s and starting using 89 octane and with a 145,000 mile motor got 215 miles out of half a standard equipment tank.
yeah but pushing the truck dont count...

hell, think the best i got in my 95 was 240 and that was 60/40 highway city driving. im getting like 210-225 or so in my 97 . thats been all city driving with the 97 though. been hurt by that accident, so i dont go very far anymore.
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  #6  
Old 06-02-2007, 09:10 PM
swedish_dakota swedish_dakota is offline
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Quote:
Originally Posted by sailsurf7713
Just stay away from big power adders. I would definitely not do NOS or a supercharger, but lightly modifying it to be a more fun and efficient vehicle: where's the harm in that?

Also those Bosch 4's are a waste of money, electricity takes the path of least resistance, and I willing to bet all four contacts aren't the same resistivity. I just changed from Bosch to autolite 3923s and starting using 89 octane and with a 145,000 mile motor got 215 miles out of half a standard equipment tank.
Would new rockers count as big power adders? after I've forked out an arm and a leg on my squeaky suspension (it squeaks worse than the bed of a whore a the moment ) My goal is nicer Brakes (discs are warped again) Exhaust and throttle body at the moment but I read on the other posts now that the gains are not so great for the low end acceleration...but maybe I am misunderstanding?
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  #7  
Old 06-02-2007, 09:41 PM
Kahunaking Kahunaking is offline
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My v6 has 130k miles. Ive got nitrous on mine and just pulled a 16.3 with 100+ temps.
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  #8  
Old 06-03-2007, 07:40 PM
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I have a 2000 3.9L V6 and I have just an intake, exaust, autolite plugs brass cap/rotor thats it. The throttle body (mine was from a 1993 V8) and I saw better higher end acceleration but lost some lower end. Plus my gas milage went to crap at 13MPG.

Currently with just what i have mentioned done, im getting 17.5-18.5MPG and the overall performance is okay, not great but better then some.
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  #9  
Old 06-04-2007, 07:19 AM
Slow97dakota Slow97dakota is offline
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Quote:
Originally Posted by Kahunaking
My v6 has 130k miles. Ive got nitrous on mine and just pulled a 16.3 with 100+ temps.
please put a good tire under the truck!!! fuck that should b a high 13
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  #10  
Old 07-11-2007, 09:06 PM
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3D9A1K9O9T8A 3D9A1K9O9T8A is offline
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47,811 baby
got her for 4 grand too!
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  #11  
Old 07-12-2007, 12:37 AM
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3D9A1K9O9T8A 3D9A1K9O9T8A is offline
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yeah nevermind i just realized that this was for high mileage V6's not mine
sorry dudes
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  #12  
Old 07-12-2007, 07:17 AM
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my 2000 quad cab 3.9 has 106k on it so far and i have plenty of mods with no problems. my best mileage has been 18.54. what kills my truck is that it weighs 4300 lbs. soon, i plan on getting some harland sharpe 1.7 rollers and eventually, some 4.10 gears.
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  #13  
Old 07-12-2007, 01:19 PM
Glimmer31 Glimmer31 is offline
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Cool Milage on 2003 V6 club cab....

New to forum.... Just got my Dakota about a month ago.. ASE rated Master Auto Technician, Teach Automechanics, Fuel Injection, Computer Controls at local techinical university. Anyway , back to the Dakota. Started out pure bone stock, 72K miles, 18.2 mpg. Did my usual to a new (to me...) vehicle. Put in Mobil 1, high flow filter, Tune up with Bosch 2's, wires, cap, rotor, new serpentine belt (Goodyear Gatorback). Milage went to 21.3. Bought Supertuner and tuned for 'Performance' and still use 87 octaine, as all it does is change shift points and up's the timing. Gave me no spark knock so I left it. Use BP gas exclusively. Now milage is 23.9. Exhaust seemed stuffy and didn't like the exhaust note, so I put cat-back duals on it with Flowmaster Super 44's. Now I drove it like grandpa for a tank to get max milage, no jackrabbit starts, 50 in 55 zone, 60 on interstate, dropped the tailgate on the highway, etc... Actually got 28.2 MPG! So I went back to normal driving, found much more horse power, (will actually smoke'em (right rear only, no posi... oh well..) in 1st and squeel going into 2nd) in usual driving, with AC on, gets 21 - 23 mpg. Next will be FI spacer. Don't know if it will help, but still experimenting. Not bad for a club cab... Love the truck by the way, just the right size, handles like a sports car. Had an S-10, wayyyyyy to small! Nice to be here! -- Glimmer 31
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  #14  
Old 10-17-2007, 10:12 AM
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2000 Dakota RC 3.9L 5spd, Autolite 3923's,180 degree thermostat, clutch fan removed, garage built ram air system using factory air box and K&N Drop in, 2 chamber flowmaster insert, 17" R/T wheels, 340 miles to a tank on 87 octane with plenty of power to smoke um down. Not too bad I guess.
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  #15  
Old 10-17-2007, 12:27 PM
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I noticed the same thing with my superchips also. I figured the advanced timing couldn't be good though on 87 though so I changed the program. As for the TB spacer don't wste your money unless you are gonna use it to mount a nitrous nozzle. Ask anyone on here and they'll tell you they don't work.
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