Trade a 1227727 Corvette and hardness for 1227730 and hardness:

[dave w]

I think 16186694 PCM is an invalid number, because Google can't find it and RockAuto can't find it.

The 1993 - 1995 PCM with Red / Blue Connectors can control either the electronic 4L60E transmission or electronic 4L80E transmission. The shift points are programmable with the electronic 4L60E and electronic 4L80E.

The 1227727 and 1227730 were used with the non-electronic 700R4. The non-electronic 700R4 uses a TV Cable to help establish shift points.

The 1993 - 1995 PCM with Red / Connectors has two fuel tables and two spark tables, Near Idle and Off Idle allowing better tuning / fine tuning for aftermarket engine performance parts.

The 1993 - 1995 PCM with Red / Blue Connectors was used in Pickups, Vans, Suburbans, and S10 vehicles, making it low cost and easy to find.

The 1993 - 1995 PCM with Red / Blue Connectors along with the 1227727 and 1227730 are neck and neck with a tremendous amount of aftermarket tuning software / hardware support.

There is the option to upgrade the computer in the 93 G20 VAN to the 1993 - 1995 PCM with Red / Blue Connetors. Check out these internet article link were they upgraded PCM's https://www.thirdgen.org/forums/diy-...-its-time.html & http://www.gearhead-efi.com/Fuel-Inj...out-Directions!

Maybe it's time to "Double Down" --- upgrade PCM and do the MPFI conversion for the WINNING HAND? (Poker Humor)

dave w

[Racprops]

Darn I transported a number IT is a16168625, please tell me about this PCM.

OMG there is SO much...Thanks.

That raises the following two questions: MAF and sequentially fired injection?? Just to have my cake and eat it too.

I thing a good MAF it the most important one. MAF WITH MAP would be second.

Rich

[dave w]

We have a Winner!

The 16168625 can be upgraded to MPFI, using Speed Density (aka MAP Sensor). There is information available about using MAF with the 16168625. I do not have personal experience using a MAF with the 16168625. I have had very good results using the 16168625 upgraded to MPFI with the MAP only, so if it's not broke why fix it? The 16168625 converted to MPFI will be controlling the injectors in Bank Fire same way the 1227727 and 1227730 control the injectors.

To have sequential fuel injection, MAF and MAP is possible, if your willing to increase the budget for some OBD2 hardware / software upgrades. Sequential fuel injection requires a Cam Position Sensor and Crank Position Sensor. The 1996 - 2000 Vortec 5.7 liter is sequential fuel injection with MAF and MAP. I would not venture converting an OBD1 engine to OBD2, because the overall performance gain doesn't justify the expense (in my opinion). The reason for sequential fuel injection, MAF, and MAP was for reduced emissions at idle. Engine performance was about the same, Sequential vs. Bank Fire.

It's also possible to convert a TPI engine to sequential fuel injection, MAF, MAP and LS type coil pack ignition or Coil on Plug (COP).

dave w

[Racprops]

OK I need to ask what MPFI??

Rich

[Fast355]

OK I need to ask what MPFI??

Rich

Having done the OBD1 to OBD2 0411 PCM swap multiple times. HUGE difference in the way the engine runs before and after. Coil per cylinder ignition can fire a very lean mixture at part throttle cruise.

[Racprops]

So is the term MPFI means a OBDI to a conversion to a OBDII??

A few concerns in my case is all the major rewiring in my van, and as I understand things at this point, the OBDII Systems are very hard to get into to do tuning were the OBDI systems are basically wide open.

Also it seems much easily to enable the lean cruse system.

Lastly I want to tune for MPG and think a PCM with so called learning systems could fight and remove improvements in MPG to suit its core programing, where I think a OBDI system might be less able to reprogram fuel settings.

Rich

Having done the OBD1 to OBD2 0411 PCM swap multiple times. HUGE difference in the way the engine runs before and after. Coil per cylinder ignition can fire a very lean mixture at part throttle cruise.

[Racprops]

There are few questions to converting my Vans PCM to operate the TPI.

I know of batch fires systems, they fire 4 injectors at a time. BUT I will need to know which four, as I understand it is two on one bank and two on the other bank per one branch of the batch.

Are there any other things I might need to know?

Rich

[dave w]

The TPI batch fire is wired for cylinders 1,3,5,7 and cylinders 2,4,6,8.

dave w

http://www.gearhead-efi.com/Fuel-Inj...8&d=1322074853