383 rwhp, stock hx35, tons of fuel, what gives???

NickTF

NickTF

Single turbo turd.
Joined
Jun 4, 2007
Messages
5,887
:Cheer:Well I made it to the dyno event on the 29th TNT hoasted and just wanted to say I had a blast! Cool see see all those trucks on the rollers!

Well I finally made the rollers spin (my truck was the first truck to dyno) and was a bit disappointed. I was expecting over 400rwhp for sure but since I didn't let me get some of your opinions. First off I can't get the dyno graph up because I don't know how to get it to photo bucket from our copier which only scans PDFs and TIFFs (neither photobucket will accept). I ended up with 383 rwhp and 737 rwftlbs. Thing that shocked me was my peak torque showed in at 2600rpm and my peak hp showed in at about 2850 rpms (pretty flat from 2750-3100). Isn't the peak tq rpm and peak hp rpm a little close??? This is my first time dynoing a diesel but I thought they were a bit close. Thought must of these things peak closer to 2000ish rpms in tq. The reason I'm asking is i'm trying to see if the converter was slipping on the dyno. I don't think Brett indicated it did. My trans is bone stock with 100,000 miles on it.

My mods are listed below in my sig and I know i'm in need of much much more charger (I was 1st or 2nd for smokiest there lol) but I figured i'd be over 400rwhp and much closer to 900rwtq. Just wondering if the stock tranny cost me that much power.

My charger continues to still only produce 34 PSI max even with all this fuel is it possible my hx35 is just not that strong any more?

Any ideas and suggestions are appreciated!

I plan to add a big single later but will probably address the trans first.

p.s. If TNT has the dyno graph and can post it up that would be super guys
 
Well had a chance to check out a few dyno graphs. I'm taking it that it is normal to have a peak torque and hp rpm so close then??? It seems so.
 
valvedby12 said:
The turbo is definately holding you back.
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Oh i'm sure it is but I figured it'd definitely support over 400hp for me???

I've titled the thread a little confusing. The hx35 is not stock, but has a 21 cm exhaust housing from an older truck.
 
Sounds to me like you are blowing through the trans. That would explain why it peaked so high. Here is a graph of my old truck on Dunbars dyno in stock trim.
 

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NickTF said:
Oh i'm sure it is but I figured it'd definitely support over 400hp for me???

I've titled the thread a little confusing. The hx35 is not stock, but has a 21 cm exhaust housing from an older truck.
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With that housing your turbo lag was huge and took forever to start spooling and i'm sure that did'nt help your lower torque.

I think you should get a smaller housing and def cut back on that fuel some (that cloud you made hovered there for a good 2 or 3 min after the run finished:hehe:) until you get that trans and the bigger turbo. I also think you could back off on the timing a little mabey try 15.5* or 16*.

Here is my sheet i was the truck right after you
 

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I suppose I could put the plate back in and move it back a little to see what it does. I was thinking about putting back on the stock turbo housing as well! Was good to meet you 94 12V, you had yourself a pretty strong truck for what little you've done!
 
Im assuming they dynoed in OD, does the converter lock and stay locked on its own when your in OD? Does it blow through the converter on the street when its locked up? You should be able to feel it. I would have thought 400+ would be no problem with your fuel.
 
B18B1LS1 said:
Im assuming they dynoed in OD, does the converter lock and stay locked on its own when your in OD? Does it blow through the converter on the street when its locked up? You should be able to feel it. I would have thought 400+ would be no problem with your fuel.
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It blows through the converter all the time on the street!!! Thing is though the dynojet doesn't present the same load as the street so far as I understand at as the drums are only 3000lbs (correct me if i'm wrong anyone). They did dyno it in OD and my trans and everything associated with it is bone stock. I believe it locks in OD, sure feels like it does.
 
NickTF said:
I suppose I could put the plate back in and move it back a little to see what it does. I was thinking about putting back on the stock turbo housing as well! Was good to meet you 94 12V, you had yourself a pretty strong truck for what little you've done!
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Thanks was great to meet you to and your truck is goin to be a beast when you get it done
 
If it blows through your lock-up on the street I would be worried its doing it on the dyno as well. But I dunno!
 
Im pretty positive that the coverter did not slip on the dyno and from the looks of the charts, I would try sticking your stock Dv's back in the truck, as that seems to be where all your excessive smoke is from and more isn't always the best with these 12v's.

Brett
 
dzlfarmboy said:
Im pretty positive that the coverter did not slip on the dyno and from the looks of the charts, I would try sticking your stock Dv's back in the truck, as that seems to be where all your excessive smoke is from and more isn't always the best with these 12v's.

Brett
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Brett thanks for the suggestion! If I had lazer cuts in there i'd consider it more but I don't I have Weston's .5mm DVs in it and so far as my limited understanding goes I don't think they're the problem. Fact is everyone making over 400rwhp with a hx35 is seeing over 40 psi it seems and i'm not seeing that kind of boost. There seems to be something related to it is my guess but it's only that, just a guess.

I even checked the lash/valve train today and I'm still at .010"/.020" intake/exhaust + or - .003" to make sure there's not issues there and nothing.
 
Well there you go, straight from the source. Get it fixed up and try again, you'll get there, you have all the right parts you just need to find their happy spots!
 
dzlfarmboy said:
Im pretty positive that the coverter did not slip on the dyno and from the looks of the charts, I would try sticking your stock Dv's back in the truck, as that seems to be where all your excessive smoke is from and more isn't always the best with these 12v's.

Brett
Click to expand...

Brett, do you have the dyno sheets in a form that photobucket will take by any chance?
 
You are lucky you have the 21 housing and dyno'd on a D.J. or you would have got pushed into the shop awaiting a tranny! Get your tranny fixed and get on a load dyno and then you'll see some good numbers! You are right in thinking that it should be making power much lower in rpm, you just have alot working against you.....but like I said if you were forcing that power to a stock tranny at 1K less rpm it'd be long since burnt up IMO
 
Mine is stock except for the VB, so far so good, but I do drive it a little different than most. I do realize it is a ticking timebomb though.
 
It seems to me the answer is obvious. You need a transmission! Regardless of what kind of dyno you had it on, it was still putting down almost 400hp and that had to go through the transmission. If the transmission wont hold the power, the engine wont load up enough to make any boost. And I would also change out that 21cm housing for an 18.5cm.
 
Nick...
You can have all the fuel you want,but,if you can not get on top of the charger to utilize it all your doing is making smoke and making your wallet beg for mercy.You will never see more than the boost your seeing due to the way to large exhaust housing.At 34psi with a 21cm exhaust housing your about the end of your rope.If you had used a 16cm it would net you around 40lbs and may shove you towards 400 closer.

All of your mods in your signature shows me your looking for full on smoke effect instead of tuning for power.With a 12v you need to have a balance of air and fuel to make the power you want down low without having to much to kill it on the bottom.You overfuel a 12v down low and not have enough charger to recover and your HP numbers suffer and torque will be made late in the run.Remember a hard hitting 12v on a dyno will make max power not far from where it made power from Cummins(2300-2600rpm)and if you can get the charger lit early to make power sooner torque goes up substantially.

Your trucks signature shows me the timing is good,injectors will work if the tips spray hit the bowl,A plate to control low end fueling should be used and some afc work on the jet to tune the low end fuel application.Its not all about being maxed out on everything its about how you make mods work in your tune.I have seen many trucks make more power with less parts than your and know of a 98 stick truck that did 330/998 with a plate,16cm housing and some tuning.

Good Luck and keep hunting because I can tell you it doesn't get any easier the higher you go in HP when trying to perfect your tune for the next HP plateau,trust me on that one.........Andy
 
i had 5x12's(370's) and a 14cm on my hx and no wastgate
55-60psi all day long
 
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