what are the differences? and will I have to swap the ECM from 305 to 350?
Thanks


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92 z-28 G92 black with white racing stripes.
Dynomax cat back
Ram air
305 5 speed, underdrive pulleys and TB by pass
https://www.thirdgen.org/rides/rideimages/92_Z.jpg

 

You should only have to replace the chip
-Rich-

 

There is no difference in the computer, or the prom chip. The difference is in the injectors, if it's fuel injected, but if it's carbed, absoloutly nothing is different.

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'82 Firebird, dead stock, 9 bolt disc rear, over 200,000 miles and still going strong, more to come...
http://www.spinfrenzy.com/stingerssx...easures.html#4

 

For SD cars, both use the '7730 ECM. It is also used on a lot of 3.1 V6 cars (except W bodies). Used 3.1 V6s are usually where TPI F-body owners will go to find ECMs if they need one.

The eproms are different between the 305 and 350. There are two aspects: the programming and the ESC circuitry. The ESC circuitry comes into play should you ever go into Limp Mode. Limp Mode relies on that circuitry and if it's wrong, your car may not even move.

From a programming point of view, the fuel injectors are different, the cylinder volume is different and the knock sensor is different (not a big deal, but it will affect your retard due to knock counts). Also, the spark tables are different between a manual and automatic (for 305s) and the L98 has a more aggressive spark table than an auto 305.

Also, there are some differences in the IAC setting for idling.

 

So what do you recommend that I all change?


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92 z-28 G92 black with white racing stripes.
Dynomax cat back
Ram air
305 5 speed, underdrive pulleys and TB by pass
https://www.thirdgen.org/rides/rideimages/92_Z.jpg

 

I gather you are swapping your 305 for a 350 and want to install the intake.

If the engine is stock, then I would just get the 22# injectors, the 350 Knock Sensor and the 350 Memcal. If you chose to use different sized injectors, then you really should have a custom eprom as the Injector Size is an important factor in the eprom in computing the correct fuel mixture.

If you plan on further modifications to your 350 in the future, then I would recommend to begin looking into eprom burning. You can EASILY change the injector size once you get the proper Memcal and then you can tweak the eprom for additional performance as you "learn" about eprom burning.

Your car is Speed Density and I am quite familar with those as I have one myself and burn my own eproms. But I don't burn eproms for a living. I do however help people as much as possible that want to learn how to do it and I can point out a number of things you can do, even with a stock setup to get better performance, better driveability and better gas mileage.

 

PS: I notice that you have a 5 speed. There was never a 350 5-speed so there is no actual BIN (the programming that is on the eprom on the Memcal). People either go one of two routes: 1) modify the 305 BIN to recognize the extra displacement and fuel injectors or 2) use a Vette Memcal and disable the Oil Temp code as the Vette Memcal will trigger an SES code if it cannot find the Oil Temp sensor (which F-bodies don't have).

You could "temporarily" forgoe the larger injectors (my SD L98 was overly rich with 22# injectors in "basically stock" configuration). I believe that 19# injectors CAN be made to work quite nicely on a "basically stock" L98. But this will require a custom eprom as 19# injectors are not standard.

From a cost point of view, keep the 19# injectors, get the eprom burning equipment, buy a 350 Memcal, change the Knock Sensor and then modify your 305 BIN to recognize the increased displacement and then start "tweaking" for performance.

Then, if you make further mods in the future (new cam, heads, intake) you have the equipment (and experience) to make the modifications necessary to your eprom.

Burning eproms and making changes are so easy that it is almost laughable. The difficult part is "tuning", but "tuning" is the same whether you have a carb or EFI - just the method of doing it is different. You don't get dirty altering the eprom for EFI.

 

Hey Glenn I have a quick question.I have a 92 Z28 5.7 parts car and I also have a 91 Z with 5.0 auto and want to swap.Is will i only need the prom and
knock sensor from my 92 Z28.I will be taking the complete motor out and putting it in the 91,is that all I need to worrie about?

Thanks For Your Time
Lanaue

 

My car is going into Limp mode and I am getting the ESC circuit code.. to fix this problem all I need is a 350 memcal and get rid of my orignal 305 memcal?