View Full Version : tbi for 401
10-31-2005, 04:44 PM
besides the expensive holley tbi, what are the other options for a 401. i noticed some of you guys with the 360's are running a chevy? tbi. are there any junkyard swaps for a 401? how hard is this stuff to set up? im looking for something with ~650cfm, and i probably wont be able to spend more than $400. is this possible, or should i just get over it? thanks
10-31-2005, 04:51 PM
I'd look at the TBI system off a 454/7.4L truck engine.
11-01-2005, 02:02 AM
For immediate functionality purposes, I'd at least take the 454's ECU as well. That way you can run the engine without having to worry about being too lean. (I think the 454's fuel map is different than the 350's; one of the GM TBI gurus here can check me on that...)
11-01-2005, 06:03 AM
11-01-2005, 08:15 AM
Originally posted by Spectre:
For immediate functionality purposes, I'd at least take the 454's ECU as well. That way you can run the engine without having to worry about being too lean. (I think the 454's fuel map is different than the 350's; one of the GM TBI gurus here can check me on that...)I would bet the injectors in the body are bigger
which could make the fule map look either richer
or leaner than the 350 code, depending. Best to
atleast go grab a 454 stock bin file from the DYI-EFI
page and compair the tables.
11-01-2005, 02:19 PM
11-03-2005, 03:20 PM
thanks some more. the howell setups look sweet but the holley ones are cheaper. i really am hoping on digging around in my local yards and seeing if i can piece somethign togeather on a budget. i really dont have much money since college is kinda expensive these days. im thinking of starting with a tbi setup off a 454. anybody know what years and vehicles these came on? ive seen a bit of info for the late 80's early 90's. what should i be looking for, as in useable vs. trash? if i get the ecm from the chevy im assuming i may have to get a new chip or modify it? also will i have to upgrade my ignition(it is currently stock). thanks
11-04-2005, 12:50 PM
I believe 1987-1993 full size GM w/ a 454 is what you'll want to grab the parts from.
You should get;
Complete wiring harness and ECM (Don't cut any wires!) grab all the sensors/relays and emissions components if you need to pass smog.
Obviously you'll want the throttle body too.
Optional stuff would be the vss, knock sensor.
Be sure to grab the ALDL diagnnostic port with the wiring harness!
Far as what is useable? Make sure the throttle body is clean inside, and that the shaft moves freely w/o any play.
The preferred ECM is PN 1227747
I went to the local yard 4 times, and found that A LOT of a-holes had cut out all the sensors etc.
Several trucks had the ECM just cut off the harness. Quite frustrating! (F*in' hacks)
Left empty handed every time.
I'd bring some masking tape and a sharpie to label everything if you're not familiar w/ working on fuel injected cars.
I bought my set-up on eBay, but I still need to venture to the boneyard for a few things.
Also buying some new sensors, and new fuel pump to limit problems (hopefully).
http://moates.net sells parts to modify the ECM for flashable chips. He also sells a chip burner.
Makes burning/installing your own VERY easy.
[ November 04, 2005, 07:53 PM: Message edited by: babywag ]
11-05-2005, 02:23 PM
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