Project MULE - 350 Vortec Tuned Port Injection build on 91 Suburban.

[EagleMark]

wonder how long it will be before we start building DIY external knock filters en-masse using one of those interesting TI chips that allow for software control of sensitivity, frequency, etc..... i know i've seen it mentioned on delcohacking a few times and at least one prototype built. considering that i think all ~98ish and up GM PCMs use that scheme, it is at least as reliable as the hardware filters.

Works great in the 0411 OS. When you going to have them ready?

I saw this and was thinking of doing the re-pinning this way. is this available? or would I have to make it myself? seems like something someone could offer. I understand this is not for my application but I was just wondering why couldn't this be done. going from the one piece ecm connector (7747 harness side) to the re-pinned 3 connectors (on the 7730 ECM side)?

Attachment 7461

They are all home made. Way more work then just re-pinning the ECM...

[pma4x4]

Just seems easier to re-pin that on the bench then to re-pin the harness hanging under the dash.

[pma4x4]

This is my first attempt at a re-pinning. I created this "map" to hopefully make things easy and understandable. Also attached are the 3 diagrams I used for reference. There are a couple spots that have "?" I wasn't sure what do do with those. I could not find a match up.

I also assumed I would have to add the fan control circuit and the A/C pressure switch circuit.

the 7730 ECM wants a knock sensor wire but I dont have one or at least cant find it in the 7747 diagram

Pass fail close?

ecm-repin-map-page-001.jpg

Reference material

7747 ecm pinout.jpg 7747 ecm pinout 2.jpg 7730 ecm pinout.JPG

[Bigdav160]

The knock sensor is B7 "est retard"

[JeepsAndGuns]

The knock sensor does not connect directly to a 7747. They use a external knock filter. Usally bolted on a plate on the intake next to the map sensor. That module will need to be removed and bypassed. It has 4 wires, power, ground, knock sensor, and then ouput to the ecm. You can remove the module, remove the ground and power wires for it from the harness, then where the module was, connect the knock sensor wire to the wire going to the ecm, as mentioned above, its pin B7 on the 7747, then that wire will go to the 7730 knock sensor input F9. The crank signal wire (pin C9 on the 7747) is not used on the 7730. So it can be taped up and tucked away. You will also have to run some wires for the IAT sensor, since there was never one on the 7747.

[pma4x4]

I have been wondering what that thing was next to the TBI. SO bypass that buy connecting the wire from the knock sensor to the wire going from the knock filter to the ECM. cap off the rest.

[pma4x4]

Anyone have any views on these others

B2 to b13
c12 - ?
which fuel injector ctrl runs which bank?

on the 7730 I dont know where these are on the 7747
B5 is TPS and MAT ground
B6 is MAP (not using) and CTS ground.

and the 5v reference on the 7747 C14
C14 to A4/A5??

[JeepsAndGuns]

Anyone have any views on these others

B2 to b13
c12 - ?
which fuel injector ctrl runs which bank?

on the 7730 I dont know where these are on the 7747
B5 is TPS and MAT ground
B6 is MAP (not using) and CTS ground.

and the 5v reference on the 7747 C14
C14 to A4/A5??

Pin B2 on the 7747 would go to pin E13 on the 7730

I assume your talking about pin C12 on the 7730?
C11 is injectors 1,3,5,7
C12 is injectors 2,4,6,8

A11 is the sensor ground on the 7747. The map, tps, and cts ground on that pin.

The 7747 powers the map and tps with the same pin (C14). The 7730 just used seperate wires. You can simply connect the 7747 wire C14 to either A4 or A5 on the 7730. Wont really matter.

[1BadAction]

I don't look at the site for a month or so and this is what I miss?!?! Neato thread.

[pma4x4]

I want to thank Jeepsandguns for letting me have the 7730 ECM at a great price. One step closer.

engine-008.jpg engine-009.jpg

[pma4x4]

Heads are in.

engine-010.jpg engine-011.jpg engine-012.jpg engine-013.jpg engine-014.jpg engine-015.jpg engine-017.jpg engine-018.jpg

[pma4x4]

I got a whole pile of TPI stuff I am selling over in the classifieds section. These are the parts I accumulated while figuring out this motor project.

http://www.gearhead-efi.com/Fuel-Inj...2306#post42306

[pma4x4]

So it's been a while since I've been here. The project is pretty much on hold until tax refund time. I am slowly trying to acquire what I can when I can. The block is done I just need to get the new pistons to them so they can check decking. I just ordered 24Lb blue top injectors (jumped on those since they were on sale). I am hoping to order som emore stuff here soon. We took the truck for a cross country trip to Minnesota in September. it did great but I think it would have done awesome with the TPI setup.

Ive been going thru the build list and I am trying to finalize the list.

[TPI 86 Caprice Landau]

I just ran across this thread and seen that your engine build mirrors what I plan for the engine swap for my 86 Caprice Landau. I have subscribed as I want to see how it turns out. I will not hijack your thread but just wanted to wish you good luck. Should be a great running engine.

[bybyc5]

I just ordered 24Lb blue top injectors (jumped on those since they were on sale). I am hoping to order som emore stuff here soon.

Hello pma4x4,

I just finished reading this thread, and have made a TPI swap myself in my 93 K1500 a while back. The torque increase over the TBI was amazing. I put The TPI system ontop of a 383 build with a Comp Cam designed for the TPI system for fuel mileage and low rpm torque. My highway mileage is amazing for a 4x4 truck on flat roads I get about 22 mpg @ 65-70 mph. Reading through TunerPro RT data logging.
I used 24 lb. injectors as well, and have a couple suggestions that will aid in getting your set up tuned properly.
1- Be sure and get the specifications on those injectors, specifically flow rate vs fuel pressure.
2- The voltage offsets for injector lag time specific to the injectors you bought.
3- Get an adjustable fuel pressure regulator. To be able to fine tune your fuel pressure.

Keep in mind that stock TPI runners and lower manifold will not flow much above 4500 rpm. So keep this in mind when buying a cam. Not sure if you have bought that yet.

Good Luck!!

Keith
NE Tennessee