Taking the PFI plunge soon

[PJG1173]

well according to ups.com my new intake is sitting on my front porch...

[brian617]

. I have also read that the MAP sensor needs to be changed since it has an integrated IAT.

Does look like an awful big plug on that MAP, that would be an easy fix though.

[Fast355]

http://www.pacificp.com/forum/viewto...er=asc&start=0 shows them as Delphi EV6 24lbs/hr. @ 43.5psi. units with USCAR connectors. hoping to find a part number I can research when it comes in. kind of doing this on a limited budget or I would just upgrade to a 98+ computer and get HPTuners or efilive. I do have a set of stock injectors LS injectors from an 02 Camaro. I also have a L31 and 454 TB if needed but I was going to compare them all to see which would work out the best or be made to work the best. this motor requires 600+ cfm I'm at 630cfm now so I'm looking to stay in that ball park. I have also read that the MAP sensor needs to be changed since it has an integrated IAT. not sure why that would be a problem if you are only wiring the MAP in it.

I started out with 4.7 injectors in my Marine intake after selling the Marine injectors on Ebay (they bring good money). Then in search of better driveability I moved over to LS1 injectors.

[Fast355]

Does look like an awful big plug on that MAP, that would be an easy fix though.

I am running the marine map on my swap. Its just the normal GM 1-bar map with a MAT sensor. My intake came with a matching pigtail for it. The actual connector pins were the same as my factory L31 harness. No splicing necessary, just unpin and repin.

[PJG1173]

I started out with 4.7 injectors in my Marine intake after selling the Marine injectors on Ebay (they bring good money). Then in search of better driveability I moved over to LS1 injectors.

hmm a way to recoup some to spend on other upgrades. I did notice when looking up the suspected part number they were quite pricey on ebay. I have to txt the guy I got the LS injectors form to see what he originally had them in since his motor wasn't any where near stock.

[PJG1173]

I am running the marine map on my swap. Its just the normal GM 1-bar map with a MAT sensor. My intake came with a matching pigtail for it. The actual connector pins were the same as my factory L31 harness. No splicing necessary, just unpin and repin.

good to know thank you

[PJG1173]

here is the PN for the LS1 injectors I have 12555894 from what I can find on line they are 26.3 # @ 58psi. I'm thinking these may be the ticket

[dave w]

Have you measured the impedance of the 12555894 injectors?

dave w

[PJG1173]

Have you measured the impedance of the 12555894 injectors?

dave w

11.8 +/- .1 which are the same as the marine ones (this differs from what I have read about on the marine injectors). I haven't double checked the part numbers on those yet because they are too hard to read installed. I plan on taking the intake apart this week so I can port match them to the gaskets like the heads are.

[dave w]

With six 11.8 ohm resistors in parallel, that is about 2 ohms. I think that is close enough to work with the '7427 PCM without modification. I don't have experience actually running the setup like your going to do, the math looks close enough. If you want closer to 1.5 ohms, you would need to install a 38 ohm resistor across the two injector terminal of all six injectors and connect the injectors in parallel.

dave w

[PJG1173]

after reading this I think I still will have to do the driver mod.
http://www.dynamicefi.com/InjectorDriving.php

[dave w]

Maybe, maybe not? Typically Dynamic EFI does not list the 16197427 PCM.

I would completely agree with the specifications for the ECM's listed on the Dynamic EFI website.

1227137 '86 Safari, Astro
1226868 '85 MonteCarlo
1227429 '86-'88 S10 2.8l
1227746 Truck
1227747 Many Trucks & Vans
1228062 Blazer
1228063 '88 Camaro, Firebird
1228746 '89-'92 Camaro, Firebird, Caprice
1228747 Truck
1228838 '90 Lumina, 3.1l
16136965 '91-'94 Caprice, Roadmaster wagon
16144288 Blazer
16146299 Truck
16149405 '93 Trans Sport, Silhouette, Lumina: APV, 3.1l
16171199 '94-'95 trucks, MT
16196391 '95-'95 Lumina, Trans Sport, 3.1l
16196396 '94-'95 trucks, MT

dave w

[PJG1173]

will it hurt to put a jumper across the drivers?

[dave w]

will it hurt to put a jumper across the drivers?

I don't have experience with doing the 6 cylinder port injector modification, so I can't answer if the jumper is needed or not. I'm thinking no jumper.

I have experience with is electronics ... with the injectors configured with the correct impedance the injector driver will be happy. I found 33 ohm 50 Watt resistors at Newark http://www.newark.com/te-connectivit...50w/dp/18R0442 ($2.39 each). I would use the 33 ohm resistors across each 11.8 ohm injector, then wire the injectors in parallel to equal 1.45 ohms impedance on the injector driver. In a perfect world 38 ohm 50 watt resistors would be available, I could not find them with Google. Using an unmodified computer / unmodified memcal means having all six injectors fire at once, which works good. Electronically, I think this is a good plan.

dave w

[PJG1173]

55 watt that thing looks bigger than the injectors. defiantly going to have to make a resistor box, I probably could use a handy box with a project board. I also have an additional computer I can mess with so it can be tested both ways.