spooling large turbo help??

[redws6rocket]

hey guys trying to get tune a friends truck, it is built motor with a larger charger. i am struggling to get it to come up and light down low! what do you guys do with timing down low increase or increase? also should the maf tables be adjusted, the truck only pulls around 2.5 pounds at idle and since it takes a while to come up all the maf tables are way off! any help would be great!!

 

[wes06dmax]

how big is the larger charger because my 66mm s400 only makes 1.2 lbs of boost at idle

 

[redws6rocket]

a 3.4" charger with a 2.6 cover and a .112 exhaust housing that precision built.

 

[Akdiesel]

3.4"...what kind of turbo is it? Just curious like S5xx? S4xx?

 

[sweetdiesel]

I would run timng low in the 10mm3 to 80mm3 from 800 to 1800 range

Are you getting fuel or is it not building rpm? whats actually happening

 

[redws6rocket]

I would run timng low in the 10mm3 to 80mm3 from 800 to 1800 range

Are you getting fuel or is it not building rpm? whats actually happening

i pulled timing way down in it, but yes it goes to about 1600 rpm and just has nothing. you can move the pedal to 100% and it still stays the same never trys to come up or rev up, this is in 4lo.

 

[redws6rocket]

3.4"...what kind of turbo is it? Just curious like S5xx? S4xx?

it is a custom precision charger, they make awesome chargers!!

 

[sweetdiesel]

i pulled timing way down in it, but yes it goes to about 1600 rpm and just has nothing. you can move the pedal to 100% and it still stays the same never trys to come up or rev up, this is in 4lo.

Then your going to have to add fuel

log it and see what mm3 you're stuck at

do egts climb still? If it takes to long to spool u will end up hurting the converter

 

[Rhall]

i pulled timing way down in it, but yes it goes to about 1600 rpm and just has nothing. you can move the pedal to 100% and it still stays the same never trys to come up or rev up, this is in 4lo.

My truck did this, and we played with the maf table to get it to fuel down low. Id try taking off in a bigger gear besides first too.

 

[Stingpuller]

Chargers

On mine it was a matter of taking fuel out. Mine would hang and not build boost with the pyro at 7 or 8 hundy and hang there. If I let off the pedal it would build heat and start to build more boost. Not sure if thats your buddies problem but if it is rolling smoke, That would be my guess. Jeff

 

[sweetdiesel]

On mine it was a matter of taking fuel out. Mine would hang and not build boost with the pyro at 7 or 8 hundy and hang there. If I let off the pedal it would build heat and start to build more boost. Not sure if thats your buddies problem but if it is rolling smoke, That would be my guess. Jeff

Very true if it rolls coal it won't build heat

 

[TrentNell]

A log of it not spooling would help alot , and as said already if its not fueling AKA no smoke or little that will make it not spool and if its too much it will have the same affect , what size injectors are in the truck ?

 

[dmaxfireman]

that is very true especially with my 4094 when i had it fueling too much down low it was awful, it would never spool up until i let out of it. it wold actually decelerate lol.... pulled a bunch of fuel out of the bottom and now it lights up much nicer.

 

[redws6rocket]

A log of it not spooling would help alot , and as said already if its not fueling AKA no smoke or little that will make it not spool and if its too much it will have the same affect , what size injectors are in the truck ?

not sure what size they are for sure, they are an old set of troys that he was not using anymore. there pretty big, i have a log of it i will try and get posted up if you guys don't mind to look at and help!

 

[IdahoRob]

Logs will help you because you can see the smoke or lack of while running. Need to keep the egt's climbing. Not enough fuel will not create the heat, and too much will put out the fire. Just right and you will find little red riding hood at the finish line.

 

[redws6rocket]

well i get the maf tables closer and figured out why it would stall to 1600 and stop. it will light about 70 feet out or so. getting better, down low seems better but it seems that as the charger is right about to come up it dumps fuel into the motor and puts the fire out? i will try and get some logs up this week!

 

[x MadMAX DIESEL]

You ever figure out the maf problem?