Tuning help

[Jayyk31]

Hey what's up guys!!! So this is my 1st post on this forum. I'm Def a newbie tuner and I came over from the dark side (hp tuners). I tuned my 2000 s10 2.2 "alppha-N" truck with HP tuners but now Im ready to get my 408 Votec running and I thought EFI Live would b a better fit.

So anyway the point of my post... just need a Lil help starting up a good tune for this.

Specs on combo...

'03 lq4 block bored .030 over
4" stroke
Mamo 235cc heads
Cam specs...

Fast 36lb injectors
Mamo poted MSD intake
100mm tb
Lingenfelter 100 MAF
LS2 return less fuel rail w/vette fuel filter
D585 truck coils
-I'm running a Morose 3 vaNE vac pump (gonna monitor it through the FTP sensor thru pcm).

I'm probably forgetting something but that's the just of it.

This is all running through a t56 Magnum (close ratio).
8.5 10 bolt w/3.90 gears.

Pcm specs...
Currently '01 0288 OS from a 1500 Silverado (auto)
DBC
So far I have done...
Trans & Trans diagnostic segment swap from an '01 6 speed F body w/ 0288 OS.
I changed the Vin from the '01 Silverado to my '92 S10 which is the truck I'm using to swap it in.

Currently engine is on stand and I'm going to start it on stand to troubleshoot my wiring and anything else b4 I swap it in my truck.

I know my 1st order of business is I have to adjust my injector tables.
Then the MAF tables.
But just would like some help getting this set if possible and I'm really sorry for such a lonnnng post!!! I appreciate any info/help along the way

[joecar]

Jayyk31,

Welcome to the forum

Post your tune file.

Do you have the injector data to populate the injector tables (as many as possible)...?

Did you measure rail pressure with fuel pump running...?

[Jayyk31]

Thanks Joe for the welcome!!! I do have the spreadsheet of data for the 36 lbs injectors. It has Inj Flow Rate, offset, fuel to wall transient, default pulswidth, min inj pulswidth, short pulse limit, short pulse adder. Im pretty sure it should populate all the cells too. I didn't measure rail pressure yet but I def will. Here is the stock tune I was thinking about using. This tune is stock, I don't believe I changed anything on this including the vin.

[Jayyk31]

Here is another pcm I have. its a reman OS 2156 DBW. I didn't update the vin yet either. Both of these tunes are auto tans. Does it matter which one I use?

[joecar]

If your TB is cable driven, then I would use the non-DBW tune as a starting point.

Are the injectors rated to flow 36 lb/hr at 3-bar rail pressure...? When you measure rail pressure (it will be 4-bar, 58 psi) you will have to scale the injectors.

~Moderator~

[Jayyk31]

I have to double check with FAST on that info. Im pretty sure they are the Bosch injectors. As soon as i get the fuel rail and lines plumbed i can measure the pressure to be 100% certain.
OK so i will use the 0288 OS. This morning i copied and pasted all the data from the spreadsheet into the tune. My question is for "fuel to wall transient" in the spreadsheet. Would that be "B3406" or "B4401" in the tune file? Other than that everything pretty much transferred over fine.

Im gonna continue editing the tune and documenting what i change in my notebook. Heres the tune now after i copied everything over except "fuel to wall transient".

Thanks for your help Joe! I really appreciate it!

[joecar]

fuel to wall transient: this would be B3406 (fuel that stays on wall after injector sprays).

B3401 would be the evaporation time of the wall puddle.

[joecar]

...

Are the injectors rated to flow 36 lb/hr at 3-bar rail pressure...? When you measure rail pressure (it will be 4-bar, 58 psi) you will have to scale the injectors.

Those 36 lb/hr @ 43.5 psi injectors will flow 41.6 lb/hr @ 58 psi (measure your rail pressure).


36 lb/hr * sqrt(58/43.5) = 41.56 lb/hr

41.56 lb/hr * 0.126 (g/s)/(lb/hr) = 5.237 g/s

at 0 kPa MANVAC, IFR = 5.237 g/s
at 80 kPa MANVAC, IFR = 5.237 g/s * sqrt(480/400) = 5.737 g/s

I see your B4001 IFR table is populated incorrectly (it looks like you pasted in lb/hr values with g/s units):

LABELS Injector Flow Rate (Grams/Second)
Manifold Vacuum kPa {link: GM.MANVAC} Value
0 39.867188
5 40.242188
10 40.429688
15 40.679688
20 40.992188
25 41.109375
30 41.296875
35 41.609375
40 41.851563
45 42.156250
50 42.406250
55 42.468750
60 42.851563
65 43.031250
70 43.281250
75 43.468750
80 43.710938

[Jayyk31]

Gotya!!! Good catch thank you!!! I will correct that!!

[Jayyk31]

I fixed the IFR. I recalculated and set the column label to lbs/hr.

I also scaled the VE & cranking VE by 25.48% as a start. Thats the difference i calculated from the cylinder air from a 5.3 to a 408ci.