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Old 08-03-2017, 01:59 PM   #1
SPEEDSHIFT
 
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Tuning for nitrous

I am going to spray my 03 and plan to start with a .032 Jet and possibly work up from there depending on drive pressure. I am looking for tuning info for what timing I should be running with nitrous. I know some say timing isn't as important on a diesel like it is on a gas engine with nitrous.

Specs:
S467.7/83/90 T4
125hp injectors
Dual CP3s
stock long block
425 head studs
Hamilton Valve Train

60psi boost
?? Drive pressure
2700us
36* max timing @ 4000rpm
26k rail pressure
1900* EGTs
Smokes fairly heavy all the way down the track.
11.44 ET @ 119mph 1.70 60ft

I want to spray this truck into the 10s with nitrous and possibly a larger exhaust housing. Is there anything I can adjust in my tuning that will make the nitrous safer/more efficient/more power than what I am currently running?



https://www.youtube.com/watch?v=oXdhSPBAeNw
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Last edited by SPEEDSHIFT; 08-03-2017 at 02:09 PM.
 
Old 08-03-2017, 02:03 PM   #2
jasonc

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No experience with n20 but always heard less timing, quicker burn rate on the bottle.
 
Old 08-03-2017, 03:49 PM   #3
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Might pull a little timing in the lower rpm, but if you're not spraying till 3k+ I wouldn't do anything. Depending on how much that shot cleans things up, try a jump in pulse width.
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Old 08-03-2017, 07:41 PM   #4
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I rigged up a gauge and it makes 70-75psi of drive pressure right now.
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Old 08-03-2017, 09:36 PM   #5
Dom_c13b

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Bodie, on some of the bigger power trucks that I've been tuning I run about 65% or more timing split above 34-3500rpm. At 4500rpm+ I've been up as high as 80% split. Have also been running a 6.7 rail sensor and bringing rail up to 29k psi. Now I must mention that this is only for dedicated race/pull trucks and that much rail is really hard on injector bodies, but I've seen pretty big jumps in power with going up to a 29k Rail.
This is also usually accompanied by a bigger injector, 200% and larger so I'm not running over 2200Us pulse. I would not run that high of a split with a 2700Us Pulse. 60-65% no problem, but above that and you're asking for trouble.
Bit of a Ramble to read all that but what I'm trying to get at is I think you can get a little more out of your tune.
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Old 08-04-2017, 08:51 AM   #6
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Quote:
Originally Posted by Dom_c13b View Post
Bodie, on some of the bigger power trucks that I've been tuning I run about 65% or more timing split above 34-3500rpm. At 4500rpm+ I've been up as high as 80% split. Have also been running a 6.7 rail sensor and bringing rail up to 29k psi. Now I must mention that this is only for dedicated race/pull trucks and that much rail is really hard on injector bodies, but I've seen pretty big jumps in power with going up to a 29k Rail.
This is also usually accompanied by a bigger injector, 200% and larger so I'm not running over 2200Us pulse. I would not run that high of a split with a 2700Us Pulse. 60-65% no problem, but above that and you're asking for trouble.
Bit of a Ramble to read all that but what I'm trying to get at is I think you can get a little more out of your tune.
I appreciate the info! I drive this truck to the track most of the time, thats about all it ever sees of the street. I may try going up to 27k and see how it does. I really need to get my timing dialed in, since I added the dual pumps the truck has/had a few concerning issues.

I had a popping noise at about 2800-3200rpm which I assumed was way too much timing, like so bad the boost gauge would jump around as it popped. At first I thought I had blown and exhaust manifold gasket. I pulled 1-3* of timing in that area and it quit. I am not as hip with timing calculators as I need to be, so I need to get better with them.
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Old 08-04-2017, 12:40 PM   #7
Dom_c13b

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That popping is coming from the pilot timing tables. At least in my experience with the 03 and early 04 trucks. I had a couple tunes for early trucks that I posted in the HPtuners forum, mostly in threads but you could look at the pilot timing that I've run in those tunes.
For the timing calculator I recommend just downloading efilive and using their calculator. You can than paste transpose the tables into hptuners.
I think that pretty much all of the tables I have in hptuners I built in efilive. I would say that most people that are tuning these trucks would say the same. The HPtuners tune tools just aren't up to the same caliber that efilive is at.
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Old 08-04-2017, 02:08 PM   #8
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Quote:
Originally Posted by Dom_c13b View Post
That popping is coming from the pilot timing tables. At least in my experience with the 03 and early 04 trucks. I had a couple tunes for early trucks that I posted in the HPtuners forum, mostly in threads but you could look at the pilot timing that I've run in those tunes.
For the timing calculator I recommend just downloading efilive and using their calculator. You can than paste transpose the tables into hptuners.
I think that pretty much all of the tables I have in hptuners I built in efilive. I would say that most people that are tuning these trucks would say the same. The HPtuners tune tools just aren't up to the same caliber that efilive is at.
I have all my pilot fuel QTY tables zeroed out, wouldn't that shut it off?

I tried all that with EFI Live, and couldn't figure it out. I think I needed a tune to open to be able to get to the calculator. I couldn't find where to download a tune to use.

Heres a video of the popping I had from a while back. https://www.youtube.com/watch?v=_F7ol5K5Hf8
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Last edited by SPEEDSHIFT; 08-04-2017 at 02:14 PM.
 
Old 08-04-2017, 04:28 PM   #9
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Only timing calc I've used is in Excel. Duramax though...

How much timing did you have in the problem areas? At 3krpm I'd say stay around the 25-28* range under full fuel.
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Old 08-04-2017, 04:31 PM   #10
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Only timing calc I've used is in Excel. Duramax though...

How much timing did you have in the problem areas? At 3krpm I'd say stay around the 25-28* range under full fuel.
It had almost 33* at 3k. Now I believe it is around 30 at 3k.
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Old 08-04-2017, 04:40 PM   #11
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What's your shift rpm again? If you wanted to clean it up on fuel only, start pulling a tad of mm3 above 3k but bump up the fuel pressure.
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Old 08-04-2017, 04:46 PM   #12
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Quote:
Originally Posted by JWhite View Post
What's your shift rpm again? If you wanted to clean it up on fuel only, start pulling a tad of mm3 above 3k but bump up the fuel pressure.
I usually try to shift at 3700. I really dont care about smoke, just want more power. I have a 1.1 exhaust housing coming next week, hopefully that will help a couple things.
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Tenacity Tuning, Longs Machine Shop, BD Diesel Performance

Last edited by SPEEDSHIFT; 08-04-2017 at 04:48 PM.
 
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