I don't seem to get much boost from my HX40??

[TomGolden]

Howdy all,



I bought my HX40 from Diesel Dynamics and had it installed by them in ther shop this past June. I asked where they set the wastegate, and was told at 43 PSI. The HX40 is totally stock. I have drag raced the truck only once, and had it dyno'd on a Mustang dyno once, last month, and I have *never* seen more than 32 PSI boost under any conditions, even under WOT and full acceleration on the dyno. I even have a boost elbow on it, which I took off of my HX35.



Is there a different boost elbow for the HX40's, or should I actually not use the boost elbow on the HX40, or should I just totally disable the wastegate... ... ... ... ...



Thanks for any suggestions.



Tom

 

[Devildog]

What is your power module set on? If mine is set on 1 sub level 3 I will only see 28lbs of boost. On level 5 sub level 3 I'll see 42lbs all day... .

 

[KatDiesel]

With just DDIII's and an EZ (TTPM) 32lbs of boost out of an HX40 would to me seem to be in line with the fuel your using. What do you have the EZ jumper set on?



Why do you want more boost? Are you having temperture problems? Have you asked DD what boost numbers they see with that combination?

 

[TXRam]

I agree with Kat - with just the injectors and the TTPM, that sounds about right. Remember that residual cylinder pressure is quite a bit lower with the HX40 than the HX35, so 32psi with the HX40 is probably about the same as 38 or so with the HX35 (i. e. , gets the same amount, or more, of air in at a lower pressure).

 

[TomGolden]

Thanks guys.



I have the TTPM jumper on the most aggressive setting, wanted all it could give me. Am currently drooling over the Edge Comp box and BD step 5's since that incredible post by CUMMINSTRKN about his making close to 500 HP with that combo on his ETH...



I have no EGT problems, actually I feel pretty good in that I have also never seen over 1200* on my pre-turbo ISSPRO EGT gauge, even on the dyno under full acceleration.



I am not really needing higher boost than the 32 #'s I get now, but in light of several other posts I have read over the last few months of people getting way over 40 #'s from an HX40, I just thought I was really missing something, and was a bit converned that I may actually have a legitimate problem somewhere.



You guys have greatly comforted my paranoia and so now I feel all is right with my mighty Cummins again



Now if I can just figure out some way to keep my darn track bar from destroying my front differential MagView cover.....



Tom

 

[CUMINNTSTRKN]

tom



when i bought my 40 i couln't get it to go over 32lbs with 2's and the comp. i even turnbuckled the wastegate shut. when i put the 5's in i still couldn't get over 32lbs. i tried a different guage a 0-100 and with the waste gate turnbuckled i saw 48psi. with the turnbuckle off and my boost elbow screwed in tight i see about 43-45psi. so try a different guage.

and then you can try the turn buckle trick.



also i made 515 on just #2

jim

 

[TomGolden]

Jim,



Thanks for the suggestions. I have a 0-50 # ISSPRO gauge, but when the issues with the SPA gauges are resolved, I am going to go with some of them. BD 5's & Comp box..... mmmmmmmm... . bad thoughts..... check book starting to smoke... ...

 

[CUMINNTSTRKN]

i just used a cheap 0-100 guage from the hardware store. i think it $5. i then tested it with my air compressor. i just ran a peice of rubber fuel line thru the window to test it.



jim

 

[Bigsaint]

Tom, if you really want to try the 5's, do so with the box you already have first. In all likelhood, you will be more than satisfied. I turn on the TST box about once a week, more out of a feeling of guilt for having it then really needing it. The EZ and the 5's with the HX40 are a great daily driver combo. I can hit 40 psi's with ease in 4th gear and 45 (my wastegate) in 5th or 6th with a little effort. That's with the Ez on and the TST off.



Scott W.

 

[Amianthus]

Mount Saint Bernard.

And with the TST on, Scott can be seen by every satellite in the northern hemisphere. WHOA MOMMA!!!

 

[KWIKKURT]

IMHO, if you can get the Egt's to 1200 there is still room for More Boost My rule of thumb is there is still more power avail from the current levelof fueling if you are over 1100 deg pre turbo.



One other way of increasing your boost is a 14cm2 or 12cm2 housing... The side effects are less lag Less smoke . .







Kurt Yardley

Mild To Wild Diesel Performance

 

[CUMINNTSTRKN]

kurt



won't egt's go up if you put a smaller exhaust housing on? if not i could put a 12 on my 40 to help lag and have the same egt's? i've been told i need to get a 18. 5 housing for both more power and lower egt's.



jim

 

[Bigsaint]

Re: Mount Saint Bernard.

Originally posted by Amianthus

And with the TST on, Scott can be seen by every satellite in the northern hemisphere. WHOA MOMMA!!!

LOL, true, true, true



Scott W.

 

[KWIKKURT]

Originally posted by CUMINNTSTRKN

kurt



won't egt's go up if you put a smaller exhaust housing on? if not i could put a 12 on my 40 to help lag and have the same egt's? i've been told i need to get a 18. 5 housing for both more power and lower egt's.



jim

Jim, One thing that I have found is the rules change for every truck and set up.



With tom's truck and the Hx40 with stock 16cm housing he is below the max power curve avail from the Hx40. And tom's Egt's are not a problem. With a Hx40 and a KS12cm2 housing my Drive Pressure differential was still close to 1:1 at 32 psi with my DD'3 and Pecomp. At 38 psi boost It was still only 40 t0 45 psi DP. . More Hp gain over the Hx35's... . It is usually best to go with the smallest housing that doesn't increase drive DP's more than 1. 25:1. One thing it also helps with the smaller housings is less smoke during accelleration due to a higher booster curve.



DP's are a big factor. I have had maybe 8 to 10 different Turbo Configs on my truck. I have seen as much power and lower egt's from 30 psi of boost then another setup at over 40 psi. the difference was the compressor wheel generated heating of the intake charge and the drive pressure. .



I am working on a Turbo now that is for the Guys that want or NEED MORE POWER It currently is good for anyone above 500+hp. It will produce 60 to 65 psi all day long without problems. . It will be in R&D for a while yet to give everyone a chance to install Stage#5 super fuelers or propane... or maybe a governor kit!! ... I am searching for and testing componets to see if I can get it down to our range of 400+Hp. There again I am keeping the Compressor heating and Drive pressures as priorties. For every degree of cooler intake charge you will see a degree of drop in Egt's and Cylynder temp/Press for the same HP.

My Goal is Max Towable / Useable HP.



Sorry for the long post... I am having way too much fun with my CTD... .

 

[KWIKKURT]

CUMMINNSTRKN,

I went back and read your Sig. You should have a bigger turbo. Wait a little while before buying a bigger housing. If I can get the psi curve up higher earlier on my B-1 You will be in "Heaven". KwikertheneverKurt