gt4088 laggy a/r/ housing

[sweetdiesel]

your truck is not like kevins nor mine... the closes way to get your to have the affest is to drop 3.54 in it. or put 35s on it.

your truck has much shorter legs then either mine or kevins does. the 1.06 housing is bigger then the HTT housing. iirc. kevin has a tighter conveter then i do.. it is naturally harder for him to get up on a charger then i do... and even harder then a short legged truck.

3-4" tire dia = ~300rpm change... that is more then enough to drop a diesel engine under a turbo.


mechanicly kevins truck is running in a lower rpm window then your truck is. were a 1.06 housign works fine for your setup it doesnt for a truck with longer leggs. in were to get the same performance on a longer legged truck one would need a tighter a/r housing. shorter legg would need a looser housing.

Adam have you tried dropping the timing? I dont even need to adjust the fuel much and definatly dont add PW in the lower RPM that makes for a choppy tune JMHO.....But each to there own I geuss

Look at a lb7 and LLY tune for a example and you can see what GM has even done

 

[malibu795]

stock setup LB7 runs 0-3* at cruising rpm say 1800 pending the truck
turbos are laggy and unresponsive. IMO

i personally run 9-12*main and 12* of pilot @ 450uS @23,000psi runnign 70mph. at the same spot pending load on the truck. kills egt and very repsonsive trubo

i like a sensitive throttle.. can make it jumpy over ruff stuff..

i have pulled timing is gets little quieter... egts start getting hotter and turbo is less repsonsive

egt currently run 600-750 while cruising on flat ground

 

[RENODMAX]

stock setup LB7 runs 0-3* at cruising rpm say 1800 pending the truck
turbos are laggy and unresponsive. IMO

i personally run 9-12*main and 12* of pilot @ 450uS @23,000psi runnign 70mph. at the same spot pending load on the truck. kills egt and very repsonsive trubo

i like a sensitive throttle.. can make it jumpy over ruff stuff..

i have pulled timing is gets little quieter... egts start getting hotter and turbo is less repsonsive

egt currently run 600-750 while cruising on flat ground

my truck has never ran more than 600-700 cruising on flat ground
i consider that normal

 

[sweetdiesel]

stock setup LB7 runs 0-3* at cruising rpm say 1800 pending the truck
turbos are laggy and unresponsive. IMO

i personally run 9-12*main and 12* of pilot @ 450uS @23,000psi runnign 70mph. at the same spot pending load on the truck. kills egt and very repsonsive trubo

i like a sensitive throttle.. can make it jumpy over ruff stuff..

i have pulled timing is gets little quieter... egts start getting hotter and turbo is less repsonsive

egt currently run 600-750 while cruising on flat ground

you need to run the increased timing just to keep the EGTs low because you add PW:hello: and your choppy throttle is the result of the PW,my pedal decides what i get.....Hence why we argue about PW all the time

Adam if thats what you like that is fine

 

[McRat]

Timing in the low pedal positions is a trade off. Higher timing will make better MPG, but lower timing will assist spoolup.

 

[Turbotug]

Aren't those generally two different areas?

Where you're at "in the pedal", so to speak, while trying to spool and while cruising.

 

[othrgrl]

Winston's truck has a T3 A5K on it, which means it has a pretty tight exhaust housing. He also has dual fuelers and gets plenty of fuel down low to spool it more quickly. I'll work on a new tune for you to try out when I get a chance.

 

[jonathancasey19]

Winston's truck has a T3 A5K on it, which means it has a pretty tight exhaust housing. He also has dual fuelers and gets plenty of fuel down low to spool it more quickly. I'll work on a new tune for you to try out when I get a chance.

That would be great....I'm on spring break this week. Let me know if you get time.

 

[RENODMAX]

Timing in the low pedal positions is a trade off. Higher timing will make better MPG, but lower timing will assist spoolup.

So does this end our debate you guys?

 

[Turbotug]

So does this end our debate you guys?

Aren't those generally two different areas?

Where you're at "in the pedal", so to speak, while trying to spool and while cruising.

Well..

FWIW, Kevin's truck spools fine if you roll into the throttle, but if you just mash it it takes a few seconds to whip up.

 

[RENODMAX]

Well..

FWIW, Kevin's truck spools fine if you roll into the throttle, but if you just mash it it takes a few seconds to whip up.

have you driven it since he retuned it?

 

[McRat]

So does this end our debate you guys?

What debate?

I ran the big housing GT4088 and towed with it, and dragraced with it. And yup, I tuned it on a dyno.

 

[RENODMAX]

What debate?

I ran the big housing GT4088 and towed with it, and dragraced with it. And yup, I tuned it on a dyno.

That less timing down low will help spool the turbo. That was what simon/adam/myself were debating.

 

[Jared Duramax]

my 4094 spools just as fast if not a little faster than stock its all in the tuning
Right Jordan?

 

[RENODMAX]

my 4094 spools just as fast if not a little faster than stock its all in the tuning
Right Jordan?

ohh i need to send you something

 

[bullfrogjohnson]

Jordan,

when yall say pull timing down low what rpm are you starting at and what throttle position?

 

[RENODMAX]

Jordan,

when yall say pull timing down low what rpm are you starting at and what throttle position?

well to really say pulling timing out wed need to know what their current tables are. but for instance if you look at adams post where hes talking about cruising on the freeway at 1800rpm under said conditions...I run 6.5* and 8* pilot. That has seemed to work well for my truck and my charger
on edit: this is on my giddy up tune, not mileage

 

[malibu795]

well to really say pulling timing out wed need to know what their current tables are. but for instance if you look at adams post where hes talking about cruising on the freeway at 1800rpm under said conditions...I run 6.5* and 8* pilot. That has seemed to work well for my truck and my charger
on edit: this is on my giddy up tune, not mileage

been out side fixing frozen shit all day for the most part..
what rail pressue? stock table is ~16k while cruising... i run the same timing on both my mpg and giddy up tune.

the said condition i posted was with 17-19% TPS

i am not goign to say X timeing and Y pilot is ideal... that would be foolish of me. i am finding that what didnt rattle @ 60*+ does rattle alittle @ 10* and we know no two trucks run alike... i am also problly ~15:1 compression..

brandon.. me cruising is 15-20% throttle. say avg accel down and on-ramp im no more then 30% and i will be doing 80+ or better if i dont get out of it by the time you need ot merge. i havent logged a "boosted" launch or stage in my truck lately.. i do know i need less then 30% TPS to build boost on the brakes,

 

[sweetdiesel]

Well..

FWIW, Kevin's truck spools fine if you roll into the throttle, but if you just mash it it takes a few seconds to whip up.

these are 2 different areas one being the WOT the other would be low to early mid.

What does the boost do when it shifts at WOT and mid throttle?

 

[Turbotug]

Small spikes at WOT, dunno what it does with moderate pedal.