MisterGrimm
Newbie
Hello all! First time poster. Long time lurker. Signed up for the forum for the wisdom that only y'all can provide.
A couple of years ago I purchased a 1990 C3500. I love the truck. It came to me equipped with a TBI 350, but the vin indicated that it was born with a 454. I figured that eventually I'd swap a BBC back in there when I came about a good motor. Fast forward to now, and I've had a 454 built for me with the intention of putting it into "Big Blue". I've got a nicely built TH400 to go behind it too.
I'm struggling with some ideas regarding engine computer management, and I figured that this would be the best place to pose my questions. The motor is actually set up for EFI - here's a quick video of the motor from the builder 454 .
So I was figuring originally that I might use the Holley sniper setup, but I believe that would require me to to upgrade all of the fuel system to play nice with the high pressure requirement of that system, which I don't really want to invest in. Plus the Holley system is sort of an a-la-carte thing and if I can avoid spending more on all of the different components, that would be ideal.
From there, I found the attractive and cheaper idea of running a stock TBI unit (with an adaptor plate so it'll play nice with the intake manifold) and a matching ECM for the 7.4, both of which would be ebay acquisitions. I do not believe that the stuff running the 350 would run the 454.
So here's where I have a few questions:
Since this is a built 454, would the OEM ECM be able to manage this without problems? If I had to guess, I'd guess "maybe".
What foreseeable issues am I going to encounter trying to run this motor with the OEM TBI setup? Would the ECM require tuning?
In the event that I'd keep the Holley EFI, would the OEM fuel lines be able to play nice with the added additional PSI from the increased demand? My guess here would be "probably not". For reference the existing system components are in great shape without signs of fatigue, etc.
Performance wise, am I insane trying to run this with the OEM gear instead of the sniper and an MSD 6AL, etc? I'm not necessarily trying to have the most beastly truck for drag racing. It's still going to be a truck that has to do truck things.
Thanks for your time, and your input/wisdom/suggestions. It's really appreciated.
A couple of years ago I purchased a 1990 C3500. I love the truck. It came to me equipped with a TBI 350, but the vin indicated that it was born with a 454. I figured that eventually I'd swap a BBC back in there when I came about a good motor. Fast forward to now, and I've had a 454 built for me with the intention of putting it into "Big Blue". I've got a nicely built TH400 to go behind it too.
I'm struggling with some ideas regarding engine computer management, and I figured that this would be the best place to pose my questions. The motor is actually set up for EFI - here's a quick video of the motor from the builder 454 .
So I was figuring originally that I might use the Holley sniper setup, but I believe that would require me to to upgrade all of the fuel system to play nice with the high pressure requirement of that system, which I don't really want to invest in. Plus the Holley system is sort of an a-la-carte thing and if I can avoid spending more on all of the different components, that would be ideal.
From there, I found the attractive and cheaper idea of running a stock TBI unit (with an adaptor plate so it'll play nice with the intake manifold) and a matching ECM for the 7.4, both of which would be ebay acquisitions. I do not believe that the stuff running the 350 would run the 454.
So here's where I have a few questions:
Since this is a built 454, would the OEM ECM be able to manage this without problems? If I had to guess, I'd guess "maybe".
What foreseeable issues am I going to encounter trying to run this motor with the OEM TBI setup? Would the ECM require tuning?
In the event that I'd keep the Holley EFI, would the OEM fuel lines be able to play nice with the added additional PSI from the increased demand? My guess here would be "probably not". For reference the existing system components are in great shape without signs of fatigue, etc.
Performance wise, am I insane trying to run this with the OEM gear instead of the sniper and an MSD 6AL, etc? I'm not necessarily trying to have the most beastly truck for drag racing. It's still going to be a truck that has to do truck things.
Thanks for your time, and your input/wisdom/suggestions. It's really appreciated.
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