3.9 superchargers

[dimmick]

I am having a hard time getting my supercharger to give my truck the power i am looking for.
It is not much better than befor i put the kit on so if any one has any hints let me know.
I am driving a 2002 Dakota Sport CC 3.9L supercharged with Crane Cams HI-6CD ignition wiht boost control JBL headers custom 3" Y pipe in to duel 3" cat back and 255 GPH fuel pump 6:1 FMU so i don't know what i should do i am running 10 psi of boost and running the 1/4 in the mid 18s.
with out the supercharger i am running 19s so what can i do about this?
Thanks :( :(

[nightmare]

first off, not to flame you or anything, but you've got the wrong engine to try and be racing. your trying to push a 4200 lb "brick" down the road at WOT. won't work too well with a v6. 1/4 mile doesn't measure speed, it measures how much torque you have. that's why stock r/t's can do it in the low 15's: 250 hp and 350 ftlbs of torque.

when you increase your torque, you increase take off. the 3.9's aren't known for their torque or horsepower. they are mainly known for their reliability.

to help you out though, you'd probably want to do major work to the engine. i.e. cam, bigger pistons, bored block, better than stock heads, etc. i'm not sure what your budget is, or what goal your trying to achieve, but this is the draw back to getting a v6 and trying to get it to perform like a v8.

[cory]

thats kind of what I was thinking, you cant just throw a supercharger on an already fairly underpowered engine and expect it to go fast. to take full advantage of the supercharger you would have to do some engine work like camshafts, roller rockers, higher flowing valves, and the things nightmare said.

[dimmick]

Thanks for getting back to me i know it is a heavy tuck my truck on the scals is 5183lb but i had a 2000 dakota sport with the 3.9 and it was running 17s low 18s it had more pep than my new one.
I know some one with a 2001 same as mine with the same kit and it is running 14s low 15s i put his kit in and had to do some fine tuning but his works and my truck is just well slow so i dont know what to do i did what the R/T but i got my truck in march of 2001 so thay did not the R/Ts out at that time but i liked my old truck it had some pep i could spin the tires with the new one with the supercharger i cant spin the tires so somthing is F up.

[nightmare]

by the way, what rear ratio are you runnin? changing to a numerically higher ratio will help your take off too. that may be a cheaper route.

[Dakota_T438]

Dont put down on the lil V6 so fast. I have a friend that has a 94 v6 that has run in the 15's. That was done naturally aspirated, 3.21 gears, and an open diferential.

[cory]

we never "put down" the v6, we just said to get the most out of the supercharger he would have to do some engine work.

[Greg555]

what blower are you runnin? details man.......... and 6:1 sounds lean to me. i'm getting ready to put a vortech on my 00 3.9 reg cab and i'm gonna run 10:1. but only gaining a second with a blower at 10psi.......... i know your truck is heavy but it can;t be that heavy. call marty and tripper at KRC performance. talk to them because something sounds wrong. and yes doin the other work will help as well. blower should be one of your last mods not your first. oh yeah 15.17@88mph NA should see 13s with the blower

[dimmick]

I am running a V2 Vortech with 3:12 gears and yes the 6:1 is lean but i gives me the most power i run a 8:1 and i works the best out of all of them i would like to take the 3.9 out and mod it to the nuts but that will be latter but i cant seam to get in tuch with Marty it has been two weeks and no one will get back to me and yes the truck is that heavy i put it on the scale at work and the scale is with in 50 lb i am going to chop some stuff off it and try the 1/4 one more time whan you get beat by a fire fly it bugs you and you dont whant to go back to the track i think that 18.4 is slow for a superchared truck dont you

[dimmick]

supercharger

[Greg555]

how did you cut into your fuel lines to run the FMU? got any pics? i have an idea of what i plan on doin jsut wondering how yours is set up. and the only way your gonna catch marty or tripper is if you call first things in the morning or right before they close. and i usually don;t expect a call back. so jsut keep trying.

[dimmick]

I did get in tuch with Marty to day he sad i need to go with 4:10 or 4:56 gears in the ass end and told me i should not run 12psi it is hard on the motor but fuel lines are not to bad take you about 1-2 hr i did it all of the truck so much better that way but hear is the pic or the FMU

[Buttons]

Have you dynoed that truck? It should be making as much power as a stock dakota R/T. Sounds like it weighs more though. I think you should be at least in the 16's.

Torque helps you get off the line, and helps you coming out of a corner. However in drag racing its all about Horsepower since 99% of the time its spend near your redline.

[WicKed R/T]

IMO, you might want to think about changing gears. Maybe up it to a 3.55 gear. This should get you moving off the line quicker. This= better 60ft times which = quicker 1/4 mile times.

[DaPurpleRT]

Going to those 4.56s will make a world off difference, I think you'd be very pleased.

[speedricer]

I say it's pretty cool that he is being different. In making the v-6 faster. I'd say it's harder to find hop up parts for the v-6.

[another mark]

I realize this is an old post, but 12 pounds of boost on a factory 3.9??? Have you considered just using dynomite?

[Doms360RT]

first off, not to flame you or anything, but you've got the wrong engine to try and be racing. your trying to push a 4200 lb "brick" down the road at WOT. won't work too well with a v6. 1/4 mile doesn't measure speed, it measures how much torque you have. that's why stock r/t's can do it in the low 15's: 250 hp and 350 ftlbs of torque.

when you increase your torque, you increase take off. the 3.9's aren't known for their torque or horsepower. they are mainly known for their reliability.

to help you out though, you'd probably want to do major work to the engine. i.e. cam, bigger pistons, bored block, better than stock heads, etc. i'm not sure what your budget is, or what goal your trying to achieve, but this is the draw back to getting a v6 and trying to get it to perform like a v8.

He really doesn't need all that, especially "bigger pistons" and for sure not a bored block. Maybe forged dished pistons and rods. Get different head gaskets cause the stock ones suck, get the heads ported....and run lower boost....10psi is way to much for the stock 3.9 unless you lower the compression by getting dished pistons..... your tune isnt right.....maybe bigger injectors...or run your fuel mixture a little different.....Rich.
My stock 98 RC 3.9 ran 16.80......your supercharged 3.9 CC should be right up with a stock CC RT in the mid to high 15s.

[Doms360RT]

Have you dynoed that truck? It should be making as much power as a stock dakota R/T. Sounds like it weighs more though. I think you should be at least in the 16's.

Torque helps you get off the line, and helps you coming out of a corner. However in drag racing its all about Horsepower since 99% of the time its spend near your redline.

Thats not true.....at all.

[dimmick]

The truck has a lot of power at 3500 rpm but be for that it is like stock
for my 1/8 i am doing 10.7 at 71 mph i can get up with the 4.7 and the 5.9 but off the line i get killed.
this year i was up racing a 4.7 he had 3.93 gars new intake and bigger throttle bodie and he was running 10.1 at 72 mph.
He told me i can cut somthing off my transmission to get my truck working better off the line no does eny one know of this of is he shitting me.
But for the gears in the back i am running 3.55 but i drive the truck for work right now so i need a truck that will not kill the gas it is bad now so i would like to know would 3.93 gears kill my gas or would it not be to bad i just need to get my take off better.

[93Dak]

Hey everyone... I have a 93 Dakota with the 3.9 L v6... my engines got about 340000 km's on it but I've just rebuilt the transmission and rear end... I was just wondering if I were to swap my engine for a V8 if the transmission would bolt up or if i would have to have it changed too

thanks

[Stylin'QCab]

I have a Supercharged v6 quad cab runnning in the 14s. I am hoping that with the new pulley, upgraded fuel system and new heads (coming soon) that I can break into the 13s. I know you guys think with all the money i spent on the 6 i shoulda just put an 8 in their but I just wanted to be different. No one has a v6 quad cab that can run down and run ahead of a mustang GT. Its rather comincal to watch their faces when a 4 door truck pulls ahead of them. And for you skeptics... i have time slips and dyno sheets to back up this post. Just email me for them.

[98 Black SLT]

I have a Supercharged v6 quad cab runnning in the 14s. I am hoping that with the new pulley, upgraded fuel system and new heads (coming soon) that I can break into the 13s. I know you guys think with all the money i spent on the 6 i shoulda just put an 8 in their but I just wanted to be different. No one has a v6 quad cab that can run down and run ahead of a mustang GT. Its rather comincal to watch their faces when a 4 door truck pulls ahead of them. And for you skeptics... i have time slips and dyno sheets to back up this post. Just email me for them.
Can you post the dyno sheets? It is not that i don't believe you, i am just curious as to what kind of numbers it pulls.

[SHADOW]

but if you put 4.56's in your truck cruising at highway speeds you will be pushing 4000-5000 rpms at like 35 to 45 mph. i would go with the 3.55 or so if you plan on a daily driver.

[Dodge Dakota]

Does anyone know who makes a good 3.9L supercharger
I was thinking of installing a supercharger and 3.92 or 4.10s in the rear to my
93 Dakota.
I seen a Vortech Supercharger for my truck but want to know if anyone knows how well they work
Any other better Superchargers? Help, need Help?
:drive:

:banana2:

:spankme:

:explode:

:buttkick:

:moon:

:stick:

:kiss:

:hammer:

[YellowDak99]

dimmick you should be getting better 1/4 mile times then me with a super charger. I run 17.51 consistanly with my stock v6.

[realdeal7369]

damn man, you should be in the high 14's with that kind of setup or so. i have a mildly woked (and hurt) v6 and ive run 16.20's or so. if it wasnt for the cam and a few lifters beeing wiped out, id probably be runing in the 15's.

you need gears. 4.10 with that combo will get that bulk moving. also your torque converter may be too small. try looking into one that stalls at about 2200. switch up to a mopar PCM (if they even make it for the v6 in that year), you may need to just buy another one and send it to a reputable company to get it reflashed using your perameters and add ons you have.

also that dual 3' cat back is TOO much exhaust for what you got. If you had a 440 in that thing and you had a huffer on it i would say ok. but i would ditch that for just a single 3" flowmaster delta series or magnaflow muffler.

i have a sigle pipe 3" from the flowmaster collector to the tip. 2.25" y-pipe from the exhaust manifolds on down. my exhaust manifolds came off a 91. your running headers so your flowing good there.

something just aint right, im reading your post again, and your running 19's on the motor?? man that aint good. i had a 96 stock that ran in the 16's fresh out the box ---bone stock.

i think if you fix the exhaust, update your tb (50mm from thefastman.com), change your Torque converter, rear gears to 3.92's, (4.56 is WAAAY too much), also, you racing on your street tires? whats the size? the shorter the rear tire the more effective gear ratio you have. 26" tall tires seem to be the turning point. anything taller lowers your gear, and anything shorter will raise it. i think in mine with 255/60r17 (r/t wheels) and 3.92 gears, i think my ratio falls in there somewhere of 3.70-3.75. just something for you to consider.

if your really stuck on having a v6 in there, you could always bore and stroke it out to abput 300 ci. put a 4" crank in there, and do up the bottom end. thats what i was thinking of doing but the for the price of the crank, i could buy two 5.2 v8s for it (just bought a v8 off ebay with trans and all wiring for 1900.oo) :banana2: :banana2: :banana2: i think the crank is close to 3ooo.oo

ill have a v6 for ya to buy and do up soon if you want it.. :biggthump

http://www.scatcrankshafts.com/

[Dodge Dakota]

I have a 93 Dakota CC with the 3.9 and i never thought it would ever be quick. Taller gears would be nice but the Gen II's are actually pretty light mine weighs 3900 lbs. I thought about raising the compression to 10.5 or 11:1 with forged pistons and rods because my truck has 275,000 miles on it and it has motor tranny and rear end so the motor will probably need to be rebuilt sometime.