Trying my hand @ EFI tuning with a little Help!

[DetailsUnlimited]

I have a tow tune and a race tune that came with EFI. Would like to start learning and ajusting the tables but what do i start with? I been told to data log, but after that what am I looking at? Pulse, Fuel rail pressure, Desired fuel rail pressure. Any help would be great! Just explain so that a newB would understand!..... ENGLISH DAMN IT! LOL THX

 

[paint94979]

I have a tow tune and a race tune that came with EFI. Would like to start learning and ajusting the tables but what do i start with? I been told to data log, but after that what am I looking at? Pulse, Fuel rail pressure, Desired fuel rail pressure. Any help would be great! Just explain so that a newB would understand!..... ENGLISH DAMN IT! LOL THX

It isn't a big deal but whom did you buy EFI Live from? Look at Pats 20/20 Tow Tune Tutorial... it is for an LLY but will give you an idea on what types of tables do what.

 

[wikdlmm]

Nick where would that be?

 

[paint94979]

here http://www.duramaxdiesels.com/forum/showthread.php?t=35

 

[malibu795]

heres a start with tunes..
everythign is a X,Y chart.. idle/low speed tables are top left.. high rpm/speed are bottom right.

pedal postion to desired torque(PPDT)- this in essent is your throttle lever connected to your foot.. this tells the ECM how far you push the pedal = how much throttle you are wanting.. and the value is in FT-LB

Torque based fuel.(TBF) this take your ft-lb value from PPDT and convert it to fuel volume(MM3).. this allows you to "fine tune" your throttle linkage into to how sensitive or lack there of it is. several tables use this value to reference load/ how far your foot is in the carb to set other parameters.

Main Injection Pulse.. this take your MM3 value from the TBF and maps it agains rail pressure in MPA(mega pascals) to get injector on time. 3100uS is usuall the max pending on how the engine hold raill pressure.. less can be better but not always the case..

Base timeing table.. this take your MM3 value from you TBF and RPM and determine when to start injection.. usually on LBZ motors 26* max timeing is more enough to make good power and keep egts in check.

Boost control. all presure on all Boost controll tables are ABSOLUTE Pressures this means 0 PSIG on the guage is 14.7 absolute(PSIA). and referneses MM3 for engine load.. 30PSIG(45PSIA) is about the max you want to go... some have gotten luck and pushed harder some not soo lucky

trubo vane target position.. refences TBF(MM3) and rpm.
value are in %.. larger the number tighter the vanes are closed.. faster the turbo will spool... dont recommend messing with these right of bat... they are more of a fine tuneing aspect then majore power changes...

thats the basics


dont fogert to saw your stock tune to go back to incase you do someting you dont like.

 

[DetailsUnlimited]

I was reading the 20/20 and most said it did not work for LBZ or LMM's.

 

[paint94979]

I was reading the 20/20 and most said it did not work for LBZ or LMM's.

it will give you an idea on how it all works

 

[wikdlmm]

Thanks primo

 

[DetailsUnlimited]

I will give this a go. I just did not what to get confused with table that pertained only to earlier models. Thx

 

[IdahoRob]

Fuel
Timing
Boost
Fuel Pressure:thumb:

 

[JoshH]

Fuel
Timing
Boost
Fuel Pressure:thumb:

Exactly. It's really pretty simple. There's no black magic involved in tuning. Just a little common sense.

 

[malibu795]

Fuel
Timing
Boost
Fuel Pressure:thumb:

Exactly. It's really pretty simple. There's no black magic involved in tuning. Just a little common sense.

hense what i posted.

 

[DetailsUnlimited]

I logged a run today on the road at wot. My truck does not smoke hardly any with my 530 hp tune. My truck dynoed at 538wrhp with a bad lift pump. When adding fuel should i add more timing also. 5% more fuel and same with timing until what? can't make it to a track this week. At wot my truck reads about 29k psi, what else should I be looking at to add more of? I believe with this tune the boost is at its peak so I dont think I shoud mess with it. Thx for any help.

 

[malibu795]

whats your current pulse width

 

[JoshH]

I logged a run today on the road at wot. My truck does not smoke hardly any with my 530 hp tune. My truck dynoed at 538wrhp with a bad lift pump. When adding fuel should i add more timing also. 5% more fuel and same with timing until what? can't make it to a track this week. At wot my truck reads about 29k psi, what else should I be looking at to add more of? I believe with this tune the boost is at its peak so I dont think I shoud mess with it. Thx for any help.

Air, in the form of a bigger turbo or twins. You're about at the limits with the stock turbo. Unless you are one of those guys going for all you can get out of the stocker, I see no reason you wouldn't want to go bigger if you're at that power level and still want more.

edit: I suppose there is always nitrous too.

 

[othrgrl]

Are you refering desired or actual pressure? With a single stock CP3 unless you are running VERY short pulse width I highly doubt you are holding 29K rail pressure. Adding more desired rail pressure isn't going to help if you are already holding less than desired. And In what table are you going to be adding more fuel? Was your main flow rate at 100+mm3 at WOT?

 

[DetailsUnlimited]

whats your current pulse width

Forgive my ignorance, But I'm trying! I think 5

 

[DetailsUnlimited]

Air, in the form of a bigger turbo or twins. You're about at the limits with the stock turbo. Unless you are one of those guys going for all you can get out of the stocker, I see no reason you wouldn't want to go bigger if you're at that power level and still want more.

edit: I suppose there is always nitrous too.

for one it takes $$$$(3 kids) which I need to spend on more important bills. And yes i would like to get all I can get out of my current stock motor. Currently at a 8.0002 in the 8th so would like to get to mid 7's if possible. I know and feel that my truck has more in it!

 

[DetailsUnlimited]

Are you refering desired or actual pressure? With a single stock CP3 unless you are running VERY short pulse width I highly doubt you are holding 29K rail pressure. Adding more desired rail pressure isn't going to help if you are already holding less than desired. And In what table are you going to be adding more fuel? Was your main flow rate at 100+mm3 at WOT?

Now this log was on the freeway so it was not the best. 26107 was the Desired I believe. Which table, I still figuring this out. I not the quickest gun in the east but I don't give up either. Is this it Pilot #1 flow rate 2.1. max 5.7?
Sunday I'll get a better log. Maybe these where the answers to your questions?

 

[JoshH]

They were asking about main fuel flow rate and main injection pulse time. The main fuel flow rate should be somewhere around 100-120, and the injection pulse time should be in the neighborhood of 2800 to 3200 on a race tune.