Greetings NASA scientists,

Not sure if I'm in the correct forum.
For a digital tuning illiterate, is it possible to convert a old school sbc to a factory LS-based fuel injection system using the EFI Connection Co. 24X sbc crank sensor etc in the timing cover, an aftermarket single plane with injector bosses, some kind of throttle body, an LS ECM, a standard non computer HEI distributor(like Sniper EFI does)?

Procure the correct components, then bring it all to get tuned at a local shop.

Seems there's perpetual 90% "mostly" complete issue with the aftermarket self learning EFI's, not to mention the reliability compared the the factory stuff....at least in everything I've been reading.
This would be for a street L31 or hopefully a 400sbc.
Thank you

 

Why not just use an aluminum replacement L31 distributor? You could actually run an LS style PCM with a 4x reluctor driving the factory L31 ignition or use the L31s distributor for cam reference only and the 24x reluctor to fire the LS coils.

Holley makes a cheaper single plane MPFI intake with fuel rails for under $500. It comes with a 4150 flange. Several decent 4150 dry 4bbl throttle bodies are on the market that use GM sensors as well. I have one that I ran on a Mercruiser dual plane MPFI intake that was 1,000 cfm.

 

Wow, Fast,

Do you mean to say I really could actually have modern GM factory LS era reliability and tunability using a combination of components for ignition and fuel injection on an old school sbc?

Would I be able to take a kind of combo like this to get professionally tuned at a shop that does LS stuff?
Thank you!

 

I replied to your other thread. I did the 24x efi kit and it worked great. I recommend it

 

Thank you Orr.

 

The 2001 and 2002 Express vans with the 5.0L and 5.7L engines had the 0411 LS1 PCM running them. The Mexican built GMT800 trucks up until 2006 or 2007 with the 5.7L had the newer 03+ LS truck PCM running them.

 

Fast,
The Express vans had ign & EFI components that were exactly like a LS motor, except for the fact they were on top of a L31-type sbc motor?

 

Um no, they had a sequential port fuel injection, a distributor, single coil and a low resolution 4x reluctor. They just used an 0411 LS PCM with a matching calibration in 01 and 02. The LS engines used a 24x high resolution reluctor and coil per cylinder ignition. EFI Connection makes a 24x reluctor for a SBC and coil mounts for coil per cylinder on centerbolt small block valve covers.

 

So, to go to a 305 L03 TBI to a cammed L31 sbc with LS EFI components, would the following be a beginning?Use an aluminum replacement L31 distributor,

LS style (0411?) PCM with a 4x reluctor driving the factory L31 ignition,

single plane MPFI intake,

a dry 4 bbl throttle body using GM sensors,

a correct wide band oxygen sensor,

a modified wire harness,

a proper high pressure in-tank fuel pump swap.
(No COP ignition used at this time)
Thanks for everyone’s input, this bring COMPLETELY new territory for me.

 

You could do that or simply get the efi connection 24x ring and 1x distributor

 

Newb questions from me Orr,

Why would a EFI 24x ring be necessary if a 1x distributor is used?

Seems there’s different & varied sophisticated routes to add LS style sequential EFI to a sbc.

EFI Connection’s 24x instead of a Vortec’s 4x would be more precise for firing 8 injectors?

Trying to get up to your speed on the terminology even, sorry.

Is a 1x distributor the name of an aftermarket manufacturer?
Thanks.

 

The distributor they sell creates a 1x signal for the cam sensor like the ls1 system.

24x ring is for the crank sensor.

more teeth the more precise but even the vortec 4x is enough for most things

i just suggest this if you wanted true sequential injection using ls1 coils and tune. There are tons of shops that know their way around the ls1 files in hptuners. Im sure they can figure out a vortec truck program as well but if you go thru with the pcm swap might as well go all the way with full sequential coil pack and ls1 24x.

me, having been down that route would suggest an even more expensive solution, holley hp efi using ls1 wiring harness and 1x dizzy from efi connection lol then use either a holley 36-1 wheel or efi commection 24x. More flexibility in what holley can do vs oem but totally depends on what u plan to do with the car down the road

 

Thanks so much Orr,

Goals are have the ‘88 T5 vert IROC factory-reliable ride after work/weekend/pleasure/twice a year trip to the strip car, without repeated calls to Holley or somebody’s tech support & endless hours on EFI troubleshooting forums.
I’d love to stay EFI, & upgrade to modern day LS type efi FROM tbi with the engine swap.

Definitely some hardware decisions to sort out & make.

If not reasonable then, it’s backwards & the heresy of using a Sofakingdom’s #6210 mech sec spd bore Holley, Performer int, Mallory 4309 prv, noncomputer HEI, etc!

 

Probably a 0411 will be best for that since its cheaper to do and most shops know how to tune them

its just the wiring that needs done which isn’t difficult but time consuming. Just need the right diagrams and pinouts

 

Orr,
Got it, thank you.

 

I've had most everything in a box or installed for a few years, just choking on the 4L60E build to replace the 700R. I'm not sure what else works- but the 411 is supposed to be capable of lean cruise which is why I stayed with the 24X system.

 

0411 will run lean cruise with or without the 24x. My vortec 350 van has had lean cruise for years. Zero misfiring with the Vortec distributor at 16.5 afr but more power at WOT with coil per cylinder.