HPTuners on 03-05s

SPEEDSHIFT said:
There was a noticeable power increase from 3200-3500. Should I lower PW and add some timing? I'm only running 22*. It's an early 04 so I am leery of too much timing with the small bowls.
Click to expand...

Yes lower duration and add timing. 3500uS is alot. A whole lot. Does it smoke like a train when you lay into it?
 
Last edited:
SPEEDSHIFT said:
There was a noticeable power increase from 3200-3500. Should I lower PW and add some timing? I'm only running 22*. It's an early 04 so I am leery of too much timing with the small bowls.
Click to expand...

This reminds me of when I stacked a smarty to my edge comp on my VP truck and couldn't believe how much power I gained, only go to the drag strip that night and run a 12.38 with the smarty and a 12.39 without. Seat of the pants feel is not always accurate, your probably making more torque, but its laying over, making less power up top.

All the stock trucks that make over 500HP to the wheels are in the 3150-3200us range and running 30*+ of timing at 3500rpm. Once you tune on a dyno you can see how important an accurate timing curve is. And above 2600us, accurate timing is very important if you don't want melted pistons. At 2000us, a timing table is pretty forgiving as the fuel shot is short enough that as long as you have 20* of timing, the injector will be off before its outside of the bowl. The higher the RPM the less duration you want as piston speed increases you need the injector shut off before the piston is too far past TDC, that's why pullers who are coming off the line at 5000rpm run a 400%+over injector so they can make their power at 1600-1800us.

Lavon
 
DirtyMaxx03 said:
Yes lower duration and add timing. 3500uS is alot. A whole lot. Does it smoke like a train when you lay into it?
Click to expand...


No, it doesn't smoke once the turbo lights. I'd get a video but I have heard enough to turn it back down before I make anymore runs. Lol

I have a set of 120s laying around, I'll wait on tuning up high until they are in and I can get on a dyno.
 
Just for reference...I ran the math for you

RPM PULSE ATDC BTDC
3100 3500 43 22.10
3200 3500 45 22.20
3300 3500 47 22.30
3400 3500 49 22.40
3500 3500 51 22.50

At 3500rpm and 3500uS...your spraying 51* ATDC....


But...what is your Table 7439 set to???
 
Last edited:
Lowered Pulse to 3100 and added 2*...

3100 3100 33 -24.66
3200 3100 35 -24.52
3300 3100 37 -24.38
3400 3100 39 -24.24
3500 3100 41 -24.10
 
Last edited:
2007 5.9 said:
Just for reference...I ran the math for you

RPM PULSE ATDC BTDC
31003500 43 22.10
32003500 45 22.20
33003500 47 22.30
34003500 49 22.40
35003500 51 22.50

At 3500rpm and 3500uS...your spraying 51* ATDC....


But...what is your Table 7439 set to???
Click to expand...


Lol good lord

It's back at 3200 and 24*. What calculator or equation are you using? I appreciate it man.
 
I apologize about the glare. That is 3200us max and 22*.

71c723c8578d73fa32024a3ad619470e.jpg
 
Bump that timing some more. Can't be a puzzy your whole life LOL

On another note,
I don't know how the throttle / injection qty table is set up, but why not leave your pulse table where its at and just back off the commanded mm3 in the higher revs? (I'm not saying to leave it at 3500us, just an example)
 
Remember that if you want to run 50% before BTDC and 50% ATDC you will have to increase the timing with RPM. If you are looking at the 7414 table, and you are running 3100us then the timing with a 50/50 split would be:

20.46 2200
22.32 2400
24.18 2600
26.04 2800
26.97 2900
27.9 3000
29.76 3200
30.69 3300
32.55 3500

I'm not saying that you want to run a 50/50 split, only a dyno will tell for sure. With that long of a duration a little less would probably be a good idea, until you can get it on a dyno. I just listed it to show what the timing needs to do with RPM. Also note the rpm's are what are listed in the 7414 table.

Paul
 
You must log in or register to reply here.
Back
Top