Lady's and Gentlemen, I have 2002 Cummins, 108,000 K miles, Superchips programmer, 4" Banks exhaust with the power elbow, Airdog fuel pump and a cold air system. I just installed a Wicked wheel. Purchased a boost elbow. Now for the question.......I have a boost gauge, it hits about 19 at max. Do not want to damage my engine but you know how we are.....I would like to squeeze a little extra out of her. What is a safe boost level? Thank you in advance!

HX35 Turbo is good to 35 PSI

 

HY35 Turbo is good to 32 PSI

 

It's based on the exhaust housing or the choke point of the turbo.

Like Mike stated if it's an HY35 set it to 30 psi if it's an HX35 set it to 33psi and your good.

Just a quick question out of curiosity, did you notice much improvement with the wicked wheel? And which turbo do you have? The HX or the HY?

Like Mike stated if it's an HY35 set it to 30 psi if it's an HX35 set it to 33psi and your good.

What is the procedure to setting the HX35 Turbo pressure to 33psi?

Adjustable boost elbow or just purchase a Edge Products boost elbow that is pre-set.

This is the cheapest way to make it adjustable

http://www.vulcanperformance.com/mobile/Product.aspx?ProductCode=ABE

I forgot the HY35 you have to use a wastegate j hook.

I use the adjustable on mine set it at 28#. Seems that egt climbed when set any higher. Love the little extra kick in the pants feel when the boost passes 19#. Mike you said 35# maybe I should try that much and see how it does.

For what ever reason my boost gauge will climb extremely fast to 35-36 pounds... The POP the wastegate falls about 2-3 pounds then rises up to 34-35 PSI and holds solid. But this all happens with 1-2 seconds and going from 55 MPH to over 70 MPH in no time flat. The EGT's typically barely make 1,300*F no if I hold on to it going higher in speed I can hit 1,400*F but now I'm going stupid fast.

where do you install that boost elbow?

On a HX35W turbo you just find the brass elbow and unhook the rubber hose and remove the OE brass elbow and install the new adjustable elbow. Can't miss the rubber hose going to the wastegate motor.

 

 

On a HY35W turbo there is a solid steel tube on the wastegate. There is no way to install a boost elbow on those turbos. So that's why I mention the J hook.

 

 

HX35W on the left and HY35W on the right.

when increasing the turbo boost do you have to increase the original exhaust size,can you simply by the elbow and crank it up?

3" exhaust will handle about 400 HP without much problem.

 

4" exhaust will do every thing above that point.

 

5" exhaust is for big boys playing at nearly 1000 HP.

It's been a while since I visited the site, to answer the question about the Wicked Wheel, every day flat land performance seems about the same, however we went camping a couple weeks ago, I pull a 30' fifth wheel and a Kawasaki Teryx on a second trailer. We climbed some significant mountains, I really noticed that the boost was hitting 20 PSI and staying up there! I do not have a boost elbow or a boost fooler. I have owned this truck since it was new. Do not recall seeing the boost stay up there like that! Also the EGT's were a little better and it seemed to stay in lock up longer (At least I think it's lock up, right under 50 mph when I floor the go pedal it hits what seems like an passing gear, it's not overdrive or second gear) and was better in the hills. And while I had the turbo out it made replacing the heat exchanger hoses so much easier!

i have a juice with attitude, rv275 sticks and on setting 5 i can bury the psi instantly if i want. I have the juice to defuel and alarm @31 psi...   I feel no need to go above that for my driving habits

Like still with my stock HX35W turbo I still peak out at 36-37 PSI and the the boost elbow pops open the wastegate and it falls to 34-35 and stays.

For towing, cajflynn always used to say keep our under 20 and don't tow fast. Seemed top work.

For towing, cajflynn always used to say keep our under 20 and don't tow fast. Seemed top work.

 

Absolutely.

 

I see way too many people doing the drag racing to the top of a grade. Matter of fact I had it happen on my way home for Ontario, OR. Crazy Ford owner didn't like my 55 MPH tow speeds and attempt to try to pass going up a 6% grade and couldn't do it. I just left my cruise set for 55 MPH and ran 4th gear over the grade. Held a nice warm 1,100*F over the grade. Boost running 20-25 PSI.

I just towed back to Colorado from Oklahoma at gcvw... ish... and there were a lot of hills that were solid 3rd gear hills with 50kt winds. I didn't get to stay in OD until the Temps dropped to 60f in Colorado on the flats along I70.

What I want to know is what EGT is the max safe continuous temp.

According to cummins 1250°F pre-turbo is max safe sustained temp.