66/71/13 problems????

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Bigdawg6969

Cummin Apart
Joined
Sep 20, 2011
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114
Hey guys I've upgraded my 62/71/13 to a 66 and I'm having all kinds of problem. First off she isn't lighting until about 2000 rpm. Next the max I can peg is 42 psi then the egt's hit the moon!! The boost flies up then hit acts like it hits a brick wall at 42 psi. I've tried adjusting the wastegate by spinning the rod in and no difference. I've tried closing off the wastegate line with a pair of vise grip and no difference. Can't find any boost leaks in the intercooler or boots. She hits 42 psi and there is still coal rollin out the pipe. Any solutions???
 
Welcome to the world of a larger exhaust housing. Your not going to spool as fast. You'll just have to live with that portion of it. As far as boost... I would say 42 psi is damn good from that size turbo with the mods listed in your sig. Just because you make more boost doesn't mean you get you useable air. Once you get outside the map for that size turbo you are just super heating the air which is counter productive.
 
Do you still have the stock HO pump on your truck? Running that with 6x16's. Those are some big injectors you got there. What rpm are you at when you hit 42 psi max boost? If you still have the HO pump. Its not helping you any. An SO pump would be much better. FYI also the Edge drag Comp performs much better than the Juice/Attitude.
 
Like said already welcome to the world of larger turbos. Mine doesn't lite till around that rpm. Also I cruise around 800-1000 degrees going 70-75 mph. I have 7x12 injectors with a stainless t4 manifold and a benched pump.
 
yeah it is a HTT stainless 13cm housing and they are taking care of it under warranty. The leg inside the gate housing was warped i could spin both gate pucks with the wastegate actuator load against it. Also my truck is a 99' so I have a SO pump not a HO and I'm hitting 42psi at 2200rpm and it gets there fast then acts like it hits a brick wall and holds it there at that psi all the way up to 3200rpm. It clears the smoke at 2000rpm then at 2200rpm it starts getting hot and starts rollin the coal. HTT said I should be easily able to put down 55 to 60psi with my setup.
 
The funniest thing is that my 62/71/13 was cooling better than this 66/71/13 and its the same ****in turbo all I did was put a rebuild kit in it and put the 66 wheel and cover on it as well as milled the center section for the bigger comp wheel.
 
Im driving a truck with a 66/71/14, 6x13 MPM injectors and a comp box. It will make 10psi around 1,650rpm and be fully lit by 2k. It should spool and run a lot better with the wastegate fixed.
 
Bigdawg6969 said:
The funniest thing is that my 62/71/13 was cooling better than this 66/71/13 and its the same ****in turbo all I did was put a rebuild kit in it and put the 66 wheel and cover on it as well as milled the center section for the bigger comp wheel.
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The 62 is a lighter wheel than that 66. So it will spool slower and would run hotter til it got lit. Also if you go to a bigger wheel then you will need to consider a bigger turbine housing to let the exhaust out. Otherwise you will just choke the engine cause it can't exhaust fatter than its feeding the engine.
 
I say get the Turbo back run it then try and figure out if its enough! The problem you had definitely affects spool and top end!
 
Theres not a huge difference in weight between a 62mm and 66mm comp wheel...spoolup and topend should be only a few hundred rpms different....

stupid phone
 
Bigda8g6969 said:
So whats the right housing to run these 66 comp wheels with a 71mm turbine wheel?
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I have the .88 ar housing on mine and it seems to work pretty good.


Mudn_1 said:
Theres not a huge difference in weight between a 62mm and 66mm comp wheel...spoolup and topend should be only a few hundred rpms different....

stupid phone
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I was told that was part of my slow spool issue along with the t4 manifold. I think my issue is actually in my fuel adjustment cause after the recent adjustments its much better
 
I have ran both, and although theres not much difference, theres enough that the 66 wasnt as fun on the street

stupid phone
 
I personally think the 13cm stainless housing will be a good for you your setup once it gets fixed. There should be a huge difference from what you described before.
 
Well I'm hoping so because right now I can't even hook on to a trailer without that bad boy hittin the moon on egt's!! I'm able to drive it down the highway but the fuel mileage dropped from 20 to 16 mpg lol. Mine is a t3 manifold 13cm housing. Fed by a 3 piece ats manifold.
 
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