You can see my sig, under load, with only 6000 pounds she will easely run up to 1200 or 1300 with about 27 pounds of boost.My plate is slightly rearward of center.

should I back off the boost?

Could it be my placement of the probe? when I drilled it I got extremely close to the webing in the manifold.

should I move the probe elsewhere?

FYI, I'm going to do exhaust soon.

 

auto or stick?

You could use more boost, maybee adjust the boost elbow?

If you can get that hot you should be able to see 30+ psi.

justmy.002

 

I can run as much as 35psi and have but it seems to get hotter?

sorry automatic !

 

am I trying to go with too big of a plate, I see alot of 10's with the same set-up as I?

 

You said you are going to do the exhaust soon. What are you running now? With the stock exhaust you will probably see those temps. A 4" straight will help to cool it down some. Also with the stock HX35 turbo at 35 psi you are pumping a lot of hot air as it's getting outside of the desirable range to run in. You can also slide the plate back a bit more to see if that will keep the temps down. Check to see if your BHAF is dirty too.

Sounds like another story of needs more air (read bigger turbo), gets more air needs more fuel (read injectors, DV's, etc), gets more fuel needs more air (read twins), etc. Get the picture -- you're hooked. BOMB away.

Paul

 

hey paul, Thats kinda what I was figuring, but wasnt sure if maybe I was missing something?
I did back it down to about 27 psi and saw about 150 deg lower? seems backward to me so thats why I posted, is my plate "too big" for my current application.

I do have only a srtaight -stock exhaust cat is empty.

It was suggested that I do a 16cm compresor wheel and housing?

honstly how much do you think the exhaust will cool me down, I read "200 degres", is that realstic?

bump the timing to 16deg?

 

Good news is you can do a few simple things to help. You'll gain some with a 4" straight through (maybe not 200 degrees). Increase the timing will gain fuel mileage, pep and decrease temps and is not hard to do. The other thing that I hadn't noticed was your location. How high up are you in Colorado? You may be fighting a little oxygen debt. If that's the case perhaps some others that live at higher altitudes can suggest some other things. As for the turbo what you are doing at >35 psi is pushing more air than it was designed for. As such it is outside of it's efficiency range. It will pressurize the air but remember what happens to air in a small container at higher pressures -- it's temp goes up. So you are pumping in hotter air too. Ask around about the larger compressor housing for your altitude. I just don't know for sure on that one as I'm a flat-lander in Wisconsin. If you're looking to add HP down the line you may seriously want to take a look at a 35/40 hybrid. High Tech Turbo in Utah has a good reputation and they can also build up your 35.

 

yup, that makes total sense to me now, we live at 7000' and only really go up from there. I'm not claiming to be a super tech by any means, I spent 11 years working for various chevrolet dealers so I'm plenty comfortable working on the cummins,not that that's a chev unit, i'm just "mechanicaly comfortable"(is that a term) I just want my ducks in a row so when I tear it down it's as short of a time frame as possible and I'd like to kill like 3 birds at one time.

KDP-exhaust and the timing, then maybe the turbo and a 3000 gov kit

 

At your 7000' elevation I think you are normal. Air is scarce. You don't need 27# boost constantly, do you? So you reach peak temp only occasionally? I shift down to push more air through the engine when I hit peak temp. The 3000GSK helps when I don't want to slow down too much. I am needing a 4" with muffler and fake cat to reduce back pressure.

Also, your #8 may be real touchy as to position. My #10 seems to be easily controllable.

 

Ya I'm learnng about the #8 plate ! anyone want to trade for a 10?

I see your sig says 3 at hiway and 28 loaded,I run about 5 crusin' and I have adjusted it to about 27, I backed ti down today again maybe 24ish. I think to be honest I'll slide my plate back somemore too.

getting the exhaust on tuesday,going camping on thursday !

Rare1 what do you have for exhaust?

 

My exhaust is the stock 3" with oem cat and replacement muffler. I think a 4" straight would help bring my egt down. I've delayed this mod because Denver emmissions testing requires the cat, but now it's to the point that I must do it.

 

Ya I understand, I live south of denver and have farm plates

Aug-9th, ok last night I moved the plate back all the way and then slightly forward, maybe 10 or 15%, I also put the BD boost elbow back in and went out and drove it- it was a pig!
I pulled over and slid the AFC all the way forward and climbed back on the hiway-much better BUT now 12psi rolling down the road, 25psi till od hits then 32 psi ! max 1100deg wfo no load !

now my question is do i move the plate say an 1/8" forward or more then put the AFC in the middle?

thanks for all the help guys, I'm still learning here.

 

any more sugestions?

 

You are on the right track with adjusting the plate. Alittle bit goes a long way. But when you change the position of the plate you also change where the governor arm (the lever that comes up with the throttle lever and follows the plate) first contacts the plate. This can be adjusted up or down. This can control how much fuel you are or aren't getting and hence boost/temps. It's not hard to adjust just tricky to get too. Don't go too far or the nut may come off and into the pump. Here is the link for the instructions. Also be sure you have the plate squared up and not skewed. governor arm adjustment Hope it helps.

Paul

 

thanks paul ,that helps a TON !


just when you think you know enough, your in my position !