What Kind Of "Computer"
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Joined: Jun 2001
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From: Fort Sask. Alberta
What Kind Of "Computer"
ok guys, i plan on building a 383 with an LT1 intake, maybe some AFR 195 heads, 6" rods, ect. and i need to know what i should use for the brains behind the eingine. the stock ecm with a custom burnt chip? i was thinking it would be nice to be able to adjust the computer just by plugging in a laptop or having a switch or something. i dont know ish about fuel injection computers, your help is appreciated...
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From: The Bone Yard
Car: Death Mobile
Engine: 666 c.i.
I currently have a friend that is using a MAF 383 with a Miniram, AFR 195s with Competition porting and 2.05 Intakes. Through tuning of the ECM we have been able to make the MAF system run very well. But this required burning his own eproms. He had bought a "custom eprom" but we've greatly exceeded that a long time ago - and we haven't even tuned it with a WB O2 sensor yet (next on the agenda).
So my answer is YES, you can tune your own eprom to handle your desired combo. But if you just want to buy a custom eprom, you will probably need to work with the people very closely since you are probably going to max the MAF around 5,000 rpm and you MUST use the "PE %Change to AF Ratio vs RPM" table to compensate and it is highly unlikely that you can get that tuned properly without a LOT of hands on testing.
Getting the mixture and spark is paramount to getting the max performance potential out of your set up. With MAF you need to do a lot of playing once you exceed the 255 gm/sec limitation and the only practical way to do that is yourself.
PS: We never intended to stay with the MAF setup and always have planned to go SD - which we probably STILL will do. We just wanted to see how far we could push the MAF and we've exceeded our wildest expectations. Again, this is because we can "test and tune" this as much as we want because we can burn our own eproms. A "custom eprom writer" probably would have told him to "pay more money" a long time ago as they wouldn't have been willing to do that many re-burns just to try and get a few more ponies. Plus he couldn't make the "rapid changes" we were able to. He would have had to send them Diacom readings, get them to burn a new eprom and then wait for them to ship him a new Memcal etc.
So my answer is YES, you can tune your own eprom to handle your desired combo. But if you just want to buy a custom eprom, you will probably need to work with the people very closely since you are probably going to max the MAF around 5,000 rpm and you MUST use the "PE %Change to AF Ratio vs RPM" table to compensate and it is highly unlikely that you can get that tuned properly without a LOT of hands on testing.
Getting the mixture and spark is paramount to getting the max performance potential out of your set up. With MAF you need to do a lot of playing once you exceed the 255 gm/sec limitation and the only practical way to do that is yourself.
PS: We never intended to stay with the MAF setup and always have planned to go SD - which we probably STILL will do. We just wanted to see how far we could push the MAF and we've exceeded our wildest expectations. Again, this is because we can "test and tune" this as much as we want because we can burn our own eproms. A "custom eprom writer" probably would have told him to "pay more money" a long time ago as they wouldn't have been willing to do that many re-burns just to try and get a few more ponies. Plus he couldn't make the "rapid changes" we were able to. He would have had to send them Diacom readings, get them to burn a new eprom and then wait for them to ship him a new Memcal etc.
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