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Discussion Starter #1 (Edited)
Need some advise on drive pressures and turbo? I have a 2005 Ford PS 4x4 CC it has 250cc injectors,Spearco,4.30 gears, ported heads, head studs, ITP fuel system. I am currently running a TN T-66 with a .68 exhaust housing, Drive pressure at WOT is 58psi and boost is 38psi this turbo doesn't light until about 2400 RPM it seem to be about a one to one drive pressure at light throttle. EGT's are high at Hwy speeds 950 to 1050 if you get into the pedal it's 1600 in an instant. If I use nitrous it run's really well. So any Idea's for a turbo should I go bigger in the compressor side or smaller in the exhaust side are will twins fix my problems? Looking to see if I can make it more streetable and be able to tow a 5000lbs boat?
 

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Sounds like you need to check your tunes, or swap injectors......


Here is something similar before the LPOP let go....

LINK



Adding a second turbo will fix the drivability issues at low speeds, and improve the top end pull it has now.
 

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Discussion Starter #4
I have only got to try this turbo is there nothing else to do? What about a smaller or bigger turbo maybe a GT-K? I am waiting for twins from you just want to know if this will solve my problems?
 

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it sounds more like what brian said based off his link... check the injs/tunes
try upgrading it to a t70 and see what it does, maybe bigger ex housing?
 

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Discussion Starter #7
Who do you recommend for a good tune? I am totally willing to try a different turbo if someone would be willing to send one.
 

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we are having the same problem with ours and are trying afew things to correct it before we change to a smaller turbo or going to twins (we are running Elites stage V though) . what is your stall on ur converter? who is it tuned by? whos injectors are u running? is it a stock cam?
 

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Discussion Starter #9
we are having the same problem with ours and are trying afew things to correct it before we change to a smaller turbo or going to twins (we are running Elites stage V though) . what is your stall on ur converter? who is it tuned by? whos injectors are u running? is it a stock cam?
The converter is stock 1800, for tunes John Wood & Innovative diesel, Injectors Casserly's 250cc, stock cam. I do have ported heads and ITP fuel system.
 

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<<< THE GAUGE WHORE...
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I would say a smaller exhaust housing to make it spool at the lower Rpms??? or am I way off base here?
 

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i would start with a converter that has a stall of atleast 2100 or even more. Changing the stall will change how streetable 10 fold. Other then that your setup should run well. You might want to give Tadd a call at Elite he can help you in the right direction.

Joe - the exhaust housing would be a good idea but with pressure differentials it may be going the wrong way. But I may be wrong, open for corrections.
 

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Discussion Starter #14
What do you think about a super 70 with a .84 or a GT-K turbo? Do you think this would bring down my EGT's and possibly get more boost?
 

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Wheelie Dude
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Bigger turbo will make egts worse and lag worse. Higher stall will help the most. So far really no one has made a bolt on non-vvt work that great on a 6.0. 6.0's just do not spool a charger worth a crap, I believe most of it is in the cam design. We will know soon as we will be installing a custom billet cam that Spartan diesel had made in a truck with a 66/.80 to see how well it improves bottom end.
 

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aftermarket cams help. The superphat shaft 62 spools well on the 6.0s with stage II injectors and a fuel system. If you insist on changing turbos I would try a garrett gt 40 with a 88 mm exhaust side.
 

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Not sure changing the cam for a daily driver,maybe for a competition truck.

We have a truck right now that spools at 1800, pulls to 4500, has Hypermax 190's.....has about 7 PSI at 65 MPH cruise. 37 PSI, 1450 max EGTs, cleans up 190's nicely.

For a daily driver, the TN 58MM units work with stock injectors.
 
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