454 Tbi vs carb gas mileage
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454 Tbi vs carb gas mileage
Help needed just bought. a 93 c 2500 suburban with a Tbi 454. Looking to improve low end performance and of course g a s mileage.in the 80s I did this with a carb setup. Rv cam small carb intake and headers. but Tbi is new to me .should I revert to the old setup or and cam intake and headers designed for the Tbi .any thoughts on which would give better mileage. Thx
#4
The problem with the factory TBI stuff is it's now ancient and even back in the heyday was limited to what it can handle and do. You could check out some of the 454SS truck websites and find guys that still burn chips for it. You would honestly be better off with a more modern injection system and not use the pocket calculator computer the truck has currently if you want to make your fueling as efficient as it can be along with headers and cam changes.
Compression is efficiency though and the dismal 7.8:1 those engines have is pretty counter productive.
Compression is efficiency though and the dismal 7.8:1 those engines have is pretty counter productive.
#5
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The other difference was that he was running a TH400 until he recently upgraded to a 4L80e. The lockup trans will give the biggest impact, but being that you have a '93 you're already ahead of the game.
What kind of MPG are you getting now?
Converting from TBI to Sniper EFI would probably not be worth the expense unless you really want the adjustability.
Here's a helpful article from a guy who converted from carb:
https://www.chevyhardcore.com/news/sniper-efi-update/
Last edited by BudRacing; 10-29-2018 at 11:34 AM.
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454 vs Tbi
Thx for your answers. I'll post my results when I finish modifications. Being an old-timer with n minimum efi knowledge I'll probably go with the old carb setup I am familiar with.
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#9
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Personally, I'd rather use this little handheld tuner with actual readings than a timing light, a flathead, and some guesswork.
Dollar for dollar, it's really not more expensive either if you're buying new parts (intake manifold & carb)..
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