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Chris
Dodge Dakota
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6/21/2004
23:29:06
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 Subject: supercharger 3.9
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I am looking for help with my superchared 3.9 last year i put a supercharger 02 dakota CC 3.9 and i dont find much more HP i did get better time on the track i was running 18.8 and i put the charger on and i only run 16.8 i am running 12lb of boost and run 3.55 gears with a auto trany and 29.04 tall tires jba headers and a full 3" exhaust and a crane cams ignition i dont know if i am missing somthing or what i know i should be doing better that 16.8 but if any one can give me some tips or somthing just let me know you can email me at dbrown13@cogeco.ca
thanks
Chris
Kingston Ont
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GB2000
GenIII
6/22/2004
01:06:47
|  RE: supercharger 3.9
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Message:
Uh...dude, you should be running that 16.8 almost stock... something ain't right.
Josh
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Chris
Dodge Dakota
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6/22/2004
01:35:09
| RE: supercharger 3.9
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I know i should be running that stock but that is why i cam on this bord to see if i can find some help me fix what i cant find i have now one in Kingston that can help me with my truck so i am looking for some one on hear to help me out i do all my own work on my truck so if some one gives me somthing to do i can do it so i hope i can find some one to help me out
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racerX
Dodge Dakota
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6/22/2004
02:15:19
| RE: supercharger 3.9
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wow. i ran my 02 3.9 automatic extended cab in the high 16s, and ive got just mild mods. (tb, superchip, cai, 1.7rrs, plugs and wires, electric fan.)
you must have a bad cylinder misfire, or your ignition is shot, or the catalytic converter is clogged, or the tranny is slipping bad, or something. krc performance says that their supercharger kits on nearly stock motors have put v6's in the low 15s to mid 14s.
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Chris
Dodge Dakota
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6/22/2004
02:33:08
| RE: supercharger 3.9
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i got my kit from KRC and the truck runs fine i only had 30k on the truck at the time i put the kit on and now i have 70k on the truck and it runs the same so i dont know what i am missing but i talked to them at krc and thay cant help me so i hope some one on hear can
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try
Dodge Dakota
JOIN HERE
6/22/2004
08:47:04
| RE: supercharger 3.9
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try opening up the intake manifold, cut the runners down, and gasket match the ports, also i did not see any mention of a new tb the stock v6 one must b killing you! i would look into getting at least a 50 mm. what size y pipe are u useing? i would get krc to do a flash on your computer that would help alot some, and put some roller rockers on it 1.6 if ur going to change the cam, 1.7 if not. just for $hits do a compression test on ur truck i would b very interested to see what those numbers come out as. do u have any tranny mods? give us more stuff to go on like everything thats done to the truck with the exceptions of the cosmetics
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Chris
Dodge Dakota
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6/22/2004
13:17:58
| RE: supercharger 3.9
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well i am running the stock tb and the y pipe is a 3" from the headers to the mufler than in to 2 2.5 i have i hi flow cat and cut out the pre cats the engen is stock but i should be running better than i am now the computer is stock just got a new one from the deller the other one died but what the kit came with is what i have on the truck the only other mod i put on it is the exhaust and coil 180 thermostat took of the fan i am a bit on the hevey side but i took off all the stuff i could my 1/8 is no good i am running 10.7 so i know i have no get up and go off the line that is one of my big things top end is fine but i am going to get a new tb and give that a try and what do you mean by runners.
thanks
Chris
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try
Dodge Dakota
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6/22/2004
14:34:16
| RE: supercharger 3.9
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if u take a intake manifold and flip it upside down so you are looking up threw the bottom u will see what im talkin about..look here http://hughesengines.com/general/intakes/images/magnum_intake2.jpg those are the runners (the openings n the inside of the intake)if u take urs off u will notice that yours will be much longer and u will have a divider dividing up both sides. cut your divider compleatly out. as for the runners cut them down till theres about 1/4 of a inch stickin up. then flip the intake manifold right side up and make the bores for the tb a true 50 mm. but i think the prob may lie in other places...ur truck stock should have been a second faster. im not bashin u or ur truck @ all. i would aslo look into the crank sensor mod. i think ur trucks timing is rediculosly retarded. is it a 4x4? do you still have the spare tire and jack and stuff on the truck too? i dont knoww hat kind of money you are looking to spend but i would open up the y pipe to 2 1/2 inches, i would also look into 24 lb injectors. are u sure u have 3.55's in the rear?
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Chris
Dodge Dakota
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6/22/2004
15:44:06
| RE: supercharger 3.9
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well i do have a 3" y pipe on the truck and i am running the 3.55 i dont whant to spend much on this 3.9 if need be i will put the 5.9 in it but i would like to get moore out of the 3.9 so i dont spend all my money i can get a 5.9 but that is a lot of work and the truck is coverd by the deller so i cant do eny thing yet with the 5.9 but thanks for the pic i will try cutting the runners down and i am getting 50mm tb this week.
thanks
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try
Dodge Dakota
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6/22/2004
23:24:03
| RE: supercharger 3.9
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i would definatly do the intake manifold. especialy with a blower! there as some good gains to b found by this mod
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six pak
Dodge Dakota
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6/22/2004
23:48:35
| RE: supercharger 3.9
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First thing to do is a throttle body then do intake as explained above a cam or 1.7rr is also a good idea YOU GOT TO LET THE CHARGER BREATHE
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Chris
Dodge Dakota
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6/23/2004
13:19:57
| RE: supercharger 3.9
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now what would be the best gears to go with this it is a every day driver and some time i drive far for work so i dont want to go with the 4.10 it would kill me for gas i spend $200 plus a week right now. would the 3.91 do the truck any good or would it kill the mpg more.
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stumpy
Dodge Dakota
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6/24/2004
12:17:09
| RE: supercharger 3.9
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Yes you definitly need to go with the 3.91"s. It wont kill your mpg and the gears will improve your start at the line. All these guys are right you need to let the SC breathe. The TB, Intake Manifold, 1.7rr, a flashed pcm with help a great deal.
stumpy
2001 R/T CC........
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IntenseDak39
*GenIII*
6/24/2004
15:40:59
| RE: supercharger 3.9
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doesnt sound like you are having trouble with your supercharger... sounds like you are having trouble with your truck or track. I mean, the s/c did knock off 2 whole seconds in the 1/4 mile... which is a BIG difference. But it just sux that you base lined your truck at 18.8.
some stuff i didnt see you post;
60 ft
trap speed
elevation
truck specifics (auto, regular cab, 4x4.. etc)
remember horsepower is seen with the trap speed and not how quick your truck is (elapsed time).
6.6 Lt. Big Block, 727 TF shift kit, 452 heads, edelbrock 750 cfm, .513/.513 284/300 crower cam, comp cams springs, comp cams pushrods, 1.5 roller rockers, dp intake, mopar ignition, mopar windage tray, dual exhaust w/ 40 series flowmasters, 4.10 gears, coilover drag suspension, approx, 3500 lbs
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CRUM Style
Dodge Dakota
JOIN HERE
6/24/2004
18:15:57
|  RE: supercharger 3.9
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2000 3.9L V6 Dodge Dakota Sport
Mods-
Magnaflow Perfomance "wide open" Exhaust
1/4 Time - 16.9 Sec
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Chris
Dodge Dakota
JOIN HERE
6/24/2004
19:49:01
| RE: supercharger 3.9
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well the truck is a club cab auto 2wd and the 60' is 10.5 i think you are talking about the 1/8 m but it is 71 mph the truck dose not pick till i hit 3000 rpm and i go like hell but for the elevation i will need to look in to it but i am going to the track this week and i will get new numbers i got a 52MM tb and i will put that on and see how it go.
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IntenseDak39
*GenIII*
6/24/2004
21:08:11
| RE: supercharger 3.9
IP: Logged
Message:
no i meant your 60' ft mark time. You can find out just about everything from that.
Like i said... dont start blaming the supercharger because it's doing it's job. There is plenty things out there to go even faster but if you knocked off 2 second with the addition of the charger, it's doing its job.
6.6 Lt. Big Block, 727 TF shift kit, 452 heads, edelbrock 750 cfm, .513/.513 284/300 crower cam, comp cams springs, comp cams pushrods, 1.5 roller rockers, dp intake, mopar ignition, mopar windage tray, dual exhaust w/ 40 series flowmasters, 4.10 gears, coilover drag suspension, approx, 3500 lbs
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IntenseDak39
*GenIII*
6/24/2004
21:13:02
| RE: supercharger 3.9
IP: Logged
Message:
is 71 mph for 1/8th or 1/4?
kingston Ontario's elevation is about 305 ft so that isnt hurting you.
can you describe your run down the 1/4?.. everything you do from the moment you line up to the end.
6.6 Lt. Big Block, 727 TF shift kit, 452 heads, edelbrock 750 cfm, .513/.513 284/300 crower cam, comp cams springs, comp cams pushrods, 1.5 roller rockers, dp intake, mopar ignition, mopar windage tray, dual exhaust w/ 40 series flowmasters, 4.10 gears, coilover drag suspension, approx, 3500 lbs
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Chris
Dodge Dakota
JOIN HERE
6/24/2004
22:46:33
| RE: supercharger 3.9
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Message:
well i get the truck up to about 2000 rpm light on i take off and the truck just stays for a bit and drops off to about 1300 rpm and starts to pick up i hit 3000 rpm and i go from 25 to 60 km/h in a sec and i hit 5400 to 5500 rpm at 12psi of boost at this point i go in to secont gear and i drop down to just under 3000 rpm and it dies for a bit and i go over the 3000 rpm about 3400 and i go like hell till i hit 5500 rpm at 12psi of boost at 120 km/h and i go in to therd gear and i just drop off the 1/4 eta is 16.8 at 89 mph so i get the mph but not the time if i race a dodge like the one i do all the time he gets off the line befor me and i get up past him and i chang gears and i die off and he go past me and by the end i am not far behind him but he gets me every time his truck is a 4.7l done up a bit but i think the truck has to much lbs i at work i got it on the scale and i told me i am 5100 lbs so i dont know what a club cab is going to be on the scales but i dont think it should be this much i got a bigger filter for the intake and that helped alot but i am runing hot for my gas temps it is like 800-900 C at normal driving and racing i go to 1000-1100 C plus but i back of if i get that hot so i think that is one of my big things i looked at the timing and i looks good 25* punched i think this i ok or should it be bigger or lower numbers.
well this is good that i am getting info i have tryed for like a yr but with out luck and i am just getting mad at this pont so any thing i can do let me know
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IntenseDak39
*GenIII*
6/25/2004
08:51:22
| RE: supercharger 3.9
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Message:
man i am gonna have to read that later and answer later... just got off work and too tired to read all of it, lol!
first off, i can tell ya your tires are just way too tall. Get a set of 26-27" diameter tires for the track and that will keep you above the 3000 rpm range and keep you in the groove.
one thing i dont understand is, if you are stalling the converter to 2000 rpms at the tree, why is it that your rpms drop to 1300 rpms when you let off the brake??
6.6 Lt. Big Block, 727 TF shift kit, 452 heads, edelbrock 750 cfm, .513/.513 284/300 crower cam, comp cams springs, comp cams pushrods, 1.5 roller rockers, dp intake, mopar ignition, mopar windage tray, dual exhaust w/ 40 series flowmasters, 4.10 gears, coilover drag suspension, approx, 3500 lbs
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Geargrinder
Dodge Dakota
JOIN HERE
6/25/2004
21:59:17
|  RE: supercharger 3.9
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Message:
I've read that it is very important to mod the intake and Port & polish the heads on the 3.9L when you add a supercharger. The airflow increase thru the heads would greatly improve the effectivness of the S/C.( That only makes sense) I know that that would mean a top-end teardown, time and money. I can't beleave that they didnt tell you that when they sold you the S/C.
...........Good luck
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