How much boost?

[Anthony Oberti]

How much boost are you guys running, WITHOUT an intercooler, in deep snow? Preferably those with an Attitude/Pure Logic box. I understand the BD box compensates when the charge tube gets hot, so I want to know what guys are seeing that don't have this system. Mine is falling on it's face when I load it real hard on a hill in deep snow and I think it is the high temps in the charge tube. Otherwise, it is perfect.......

 

[Super Dave3]

Do you have any way to measure your charge temps? I know Kinser runs well over 10 lbs of boost without a intercooler, but his setup is a Boondocker. As for the Boondocker box compensating for high charge temps I am not aware of this.

 

[EricW]

Do you have a rapid drop in RPM's as well? I had a boost leak issue at the throttle bodies and it caused my sled to peak at 8300 at the start of a pull then drop fairly quickly to 7600-7800 and hold there for the rest of the pull. In spring conditions it seemed worse even with w BD mini intercooler. I messed with clutching and waste gate linkage at first till I checked for leaks then figured it out.

Might be worth doing a true boost leak test and see if your air tight. I have all the plugs for the pipe, intake, throttle bodies, air box/intercooler, and a low pressure air regulator set up to allow you to put 0-14 pounds of shop air to your system. You can even watch the changes in your boost controller pressure to index exactly how many turns equals what psi.

If you need the stuff just shoot me a pm. Good luck. EW

 

[EricW]

As for the Boondocker box compensating for high charge temps I am not aware of this.

I think he means the ADA Dave. How u been? EW

 

[Anthony Oberti]

It ONLY occurs in DEEP snow at the end of a long pull.....or towards the end. No other time does it occur. And it is not as noticeable on the flats in the deep, only when the sled is really loaded.

 

[EricW]

Not familiar with the Attitude / Pure Logic. Do they have a way to record charge air temps? If so what temps are you seeing? Do you think there is any chance of reduced fresh/cold air flow due to the deep pow/ice resticting your venting? Do you see swings (up or down) in your egt numbers when this happens?

How does your exhaust dump? Any chance back pressure could increase on long pulls in deep pow? Sounds like an odd gremlin for sure. EW

 

[devilrmk]

How does your exhaust dump? Any chance back pressure could increase on long pulls in deep pow? Sounds like an odd gremlin for sure. EW

I had this problem before I went to side dump exhaust, not the same sled or setup but it did affect mine much more with the turbo than without

 

[Anthony Oberti]

Does not seem to be an intake or exhaust problem. Pretty sure it is getting too hot at the charge tube.

 

[Super Dave3]

To verify what you think is too high of charge temp your going to have to figure a way to measure what the charge temp is.

 

[racerjb]

AO, an inexpensive way to measure the charge tube is to put temp stickers on it. I know this isn't the most accurate way but can get you in the ball park and easier than putting in a sensor, extra gauge, etc. Also good for placing on your clutches.



http://www.hrpworld.com/index.cfm?t...trips&form_prod_id=167,49_1027&action=product

 

[Anthony Oberti]

I like that idea........so, if I find that my temps are through the roof, then what? Intercooler? How much boost are guys running without an intercooler, in the deep snow when you really load the motor? Preferably Attitude/Pure Logic kits.

 

[KAWGRN]

anthony I have the same kit as you and in deep snow on along pulls my boost stays the same ,,, are you possibly feeling a missfire like a stutter?????Whate your AFR reading at the time you loose bost???? and I have a temp sensor in my charge tube and its always at around 185-230 degrees at 14psi,,,, sled Rocks!!!!! what are you running for clutching I have some new combos that are working at 10-11K elevation, and do you have the new fuel reg from Garr yet???? and Race pipe????????

 

[happylilcuss]

AO I know mine isnt the same as yours but I am pretty sure I have had the same problem with mine.. At 10-12 pounds of boost it runs solid all the way through a climb. When I turn it up to 14-16 psi at the top of bigger hills it falls on its face.. It feels like a powder bog or even a clutch slipping issue.. My setup has a power jet in the charge tube to help cool the thing down but I dont think it can compensate with the higher boost.. I am with your thought process that the only real solution would be to go with an intercooler.....

I am planning on doing a 660 or a 685 here someday and I am thinking when I do its gonna need something so I am following this thread hoping somebody will have a concrete solution..

 

[Anthony Oberti]

anthony I have the same kit as you and in deep snow on along pulls my boost stays the same ,,, are you possibly feeling a missfire like a stutter?????Whate your AFR reading at the time you loose bost???? and I have a temp sensor in my charge tube and its always at around 185-230 degrees at 14psi,,,, sled Rocks!!!!! what are you running for clutching I have some new combos that are working at 10-11K elevation, and do you have the new fuel reg from Garr yet???? and Race pipe????????

My AFR goes to 11.8, 11.6, 11.4.....it goes super rich, and I think because the air temps are going through the roof. In normal snow or hard pack, no problems, but in super deep heavy snow........problem. I have the race pipe, no fuel reg though....what is that for?? And I am not lossing boost, I am going so rich that I loose rpm and it starts to fall all over itself. PM the clutching.

 

[Anthony Oberti]

Dusty(Happy)......I can run 14lbs all day, but ONLY in the super deep snow do I have this problem. The boost doesn't drop off(....I don't think)....the motor just bogs down from being so rich, and I assume it is the air temps. I am going to turn it down to 12lbs this weekend and see if it does the same thing, then turn it right back to 14lbs and see what the difference is.

 

[powdrdog]

Lots of good possible answers to this problem. not totally convinced that it is an issue with intake air temp getting to hi. I had this same problem last season. my problem was a tiny hole in my exhaust pipe just before the turbo as well as a cracked weld on my aluminum air box. testing for system leaks is where I would start. very frustrating when your sled doesn't run right and something as simple as this caused me a year of grief.