Engine Swap and Tuning on a 1990 Bonneville LE - Page 4 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 03-14-2007, 12:07 AM   #31
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I think I'm at least going to do an oil pressure gauge that way. Thats so much better than mounting under dash or trying to make a pod look good.
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Old 03-14-2007, 01:49 AM   #32
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Does that ROM software/hardware have the ability to modify 93 style EPROMs.
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Old 03-14-2007, 08:56 AM   #33
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Quote:
Originally Posted by BonneMeMN
Does that ROM software/hardware have the ability to modify 93 style EPROMs.
Yes, He has some map files for the L36 controller (type 247 or 24. What is the part number on your ECM? (should be on the tags on the outside of the case..something like 16183247)

The way the software and it'* support is done is by the family of ecm, not by any particular model year. If the ECM on your car isn't listed, it is possible to switch to a similar one that is.

As to the hardware end of it, it'* the same. They use a 27C512 EPROM, but all the burners show thus far are capable of reading and burning those chips, they are an industry standard too.
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Old 03-19-2007, 09:04 PM   #34
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What'* the update? Is the LN3 being pulled yet?
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Old 03-19-2007, 09:18 PM   #35
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Quote:
Originally Posted by Bonneville94V688
What'* the update? Is the LN3 being pulled yet?
Nope, not yet. With the tools in place, I'm working on the '87 Camaro so I can drive it if needed. I think I'll move the Bonneville'* upgrade up the schedule a little. Original plan was to do the '87, then insert the LT1 into the '94 V6 Camaro, then do the Bonneville.

Once the '87 Camaro is roadworthy again, I'll pull the motor on the Bonneville. The '94 can wait a little longer, since it needs some major items.

I've only got a few weekends of work to do on the '87 Camaro. Some excess wiring removal, which I got partway through this past weekend, new T-top seals and door gaskets to button it back up again. Car is not in as bad shape as I thought...though chemical warfare was needed to kill off the wasps and spiders in it.
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Old 04-06-2007, 11:51 AM   #36
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Any Updates?
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Old 04-16-2007, 08:46 AM   #37
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Quote:
Originally Posted by theprodigalstranger
Any Updates?
Not recently. I'm working on the '87 Camaro pretty much non-stop on the weekends. I need to have another running car to use while the Bonneville is under the knife.

I hope to pick this thread back up in a few weeks time. As soon as the '87 is back to flight ready status, the Bonneville get'* it'* new motor. (the current one just passed the 76k mark...not bad, 50k miles in a years use.)
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Old 04-17-2007, 12:06 AM   #38
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Just the knowledge base I have been looking for!!!!!!! I have made it through the first page, can't wait to read on when I have more time!
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Old 05-16-2007, 07:52 PM   #39
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Don't have to even break out a soldering iron. Simple. I remember the ROM in my 84 buick wasn't even that difficult...

27256'* are easy to get, too.
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Old 05-16-2007, 08:10 PM   #40
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Quote:
Originally Posted by Doppleganger
Don't have to even break out a soldering iron. Simple. I remember the ROM in my 84 buick wasn't even that difficult...
Your '84 Buick probably used the really old style of calibrator prom, which was just a 27C32 in a plastic carrier that when into a matching socket.

Like this TBI Computer (Type 747) that I modified to hold the calibrator in a ZIF socket:



Note: For folks with older Bonnevilles that want to go to Fuel Injection without a lot of issues, this is the way to go. You could spend a $1500 to $2000 on a aftermarket Holley or Edlebrock EFI system, but you are not going to get anything better than the classic GM TBI system...which you can cobble together and tune for about $200.

BTW...the software to edit the calibrator prom is FREE...the Demo version of TunerCat works on this style of TBI computer. Just download it and have fun.
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