Onemoparnut

Ok now that I have the goerend converter in I see the turbo lag that everyone is talking about with these trucks. I never really had much lag before because the converter slipped so bad that the lag was almost not there at all. I also have ALOT of smoke till it spools up. If I try to reduce the smoke before spool up will I increase the turbo lag?

dzl_damon

I've READ that less fuel before the turbo lights will HELP it spool. I can not describe the math behind it though... that's why I disclaim that I read it!

Richie O

Most of the overfueling issues with low boost occur with big injectors. As far as I am concerned a stock 6x.009 can not overfuel even at maxxed out settings.

Onemoparnut

Well I will have to try it then and see what happens. I was just thinking that less fuel would mean more time to spool up making lag worse.

rlyons

You need fuel to make heat and heat is what spools the turbo up so if you reduce the fuel you will increase lag. Upgrade the turbo and the lag will disappear.

Swarthy Dago

Heat is what spools the turbo ? Not air flow ? One should or could say the following, "more of the ideal air-fuel mixture spools the turbo ......... " but simply saying heat is confusing to me. Please clarify.

KD93

Rlyons is right, it's heat that moves the turbine, not exhaust gas pressure. I can't remember exactly why, but give me 24 hours and I'll go read my book on it.

What I tried on the setup on my old heap was backing the smoke screw pretty much all the way out, and my AFC is around 1.5 turns from bottomed out. If you want less smoke, the AFC is going to help even though it's going to increase lag time. I have a little more than a grey haze at WOT with this.

dkimmel

does your truck still have stock turbo?

cougar

I guess my truck is an exception to that rule then. My star wheel and smoke screw are all the way up and using an M&H M2 pin. No lag.

Crossy's son

Smoke screw and starwheel a ways down, lots of lag, wayyy too much smoke.

guess it's time for a faster spooling housing Bill, may have an extra 18.5 here soon

PapeCAT

Gas expansion spools the turbo true. Perhaps dumping a lot of (relatively) cold fuel into the cylinders at first provides more cooling than a balanced more complete burn to spool the turbo faster (at first)

dillenger1

the gasses from combustion are still expanding coming out of the exhaust manifold.This expanding energy is superheated expanding and pushing on the turbine wheel,spinning up the turbo.

Onemoparnut

Yes stock turbo

Onemoparnut

My star wheel and smoke screw are in the stock settings. I still aint sure what housing I have I gotta check it out.

G1625S

I would run the afc as tight as it will go--smoke screw flush with the inside of the top and spring wound up tight. At that point, there shouldn't be much smoke at all before spool, though it will be slow to spool. Then, slowly start loosening the starwheel, maybe 2 turns at a time, untill it comes up on boost nicely. Then run the smoke screw down in the same manner untill you get a light puff on tip-in. There is a fine line with afc tuning, especially once you've made some mods to the tranny.