3400/3500 FIERO 7730 Swap

[robertisaar]

should you decide to use A1, here is the pinout for a 7730 using A1.

[mr.rogers]

really? i used the sinister performance conversion sheet, so what ever mask that is. bcc? it was a 93 sunbird 3.1 5spd.

[robertisaar]

by BCC i meant the four letter code on the PROM that your fiero started with from the factory. i don't know what the conversion sheet looks like, but i would rather just pin it exactly the same as an application that uses a 7730 and A1.

EDIT: just took a look over it, is it the same PDF twice? and its running with a 90-92 camaro v6 pinout, which should be $88. many people convert from $88 to $A1. i have yet to do it, so i can't vouch for it.

[mr.rogers]

what is the difference between $88 and $a1? and what does the fiero factory prom have to do with anything? will i have to repin again if i go with $A1?

[robertisaar]

factory PROM to have some idea what the VE should look like. also speed sensor and related settings.

yes you would have to change a few pins

its more thoroughly hacked, so its more versatile...

[SappySE107]

My chip is A1 based and meant for a manual transmission, 2000+ injectors and 2000+ fuel pressure regulator. The stock $A1 chip is only good for stock 3.1 injectors, which won't support a 3400.

There should be no wiring difference, as cars with $6D can run A1. Thats 1988-89 code. $88 is 1990 code, and $A1 is 91-94. DF is 91-93 3.4 DOHC and 93 3.1 w body with 4T60-E code.

[robertisaar]

heres a 90 firebird 3.1, which should be using $88 and is a 7730.

i haven't checked to see if there are differences yet, but i'm working on it.

[robertisaar]

ok, i went through the two sets of pinouts and here's what i came up with:

differences:88/a1
serial data: a8/a9
ground might need changed d1/d1
a1 doesn't use VATS
no cruise on a1
ground might need changed b6/b6
a1 doesn't use a 4th gear switch
a1 doesn't use AIR

now i'm not saying a1 doesn't use air/4th gear switches/vats, but with the cavalier that this pinout came from, there isn't.

and i'm definitely with Ben on the resistor packs not determining the pinouts. they're laser-cut resistors, nothing more. hell, it only gets used at start-up anyway, or if you can manage to get the engine under like 400RPM.

knock sensor filter: definitely not it either, its what its called: a filter, nothing more.

the pinouts HAVE to be in the PROM. burn a chip, get it to run well, then change the codemask value in the tune, see what happens. THAT is why it has to be the prom itself. in the old C3 ECMs it might work the way that the CAL-PACK contains the pinouts, but the P4 ECMs, its gotta be the PROMs

mr. Rodgers: what ECM did the fiero come with? the 7730 or something else? if the 7730 is the original, i can get pinouts for that, and know EXACTLY what we're starting with.

[SappySE107]

? Change the code mask value, update the check sum, and tell me what happens. No cruise on A1? Who needs VATS? 4th gear switch? Are you sure you aren't comparing F body to FWD?

[robertisaar]

i mentioned it was from a firebird, and the other from a cav, didn't i?

point being, there are SMALL wiring differences...

[SappySE107]

compare a 1990 j body to a 1991 j body. $88 vs $A1 without the platform difference.

[robertisaar]

90 cav, 93 cav

EDIT: PDFs removed, no point in keeping them

[robertisaar]

just for shits and gigles, here's 91/92/94...

EDIT: these are also removed for the same reason.

[robertisaar]

7727s and 7730s use entirely different connectors, how the hell can you not repin???

on a side note heres what i found:

91 has b11 used as speedo, 90 doesn't have it
92 has d1 used as a ground common to d7/d6/a12, while on 91 its connected to e15
91 uses c1 for vss out to cruise, 92 doesn't have it
NO difference between 92-93
NO difference between 93-94

[3400beretta]

7727s and 7730s use entirely different connectors, how the hell can you not repin???

My point exactly.