I have a lo3 right now and am trying to sell it for a 4th gen z-28. if i end up keeping my car, i want to put a 383 or a 406 in it. I want to do this and spend as little money as possible. my engine requirements are around 450 h.p. and 450+ lb/ft torque. should i switch over to carb. or should i modify the throttle body? I want this to be cheap but effective. If i keep my t.b.i. what combination of tb, intake, chip will be able to support a 450+ motor? thanks!!

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Twells

1992 R.S. 25th Anniversary
* Borla
* Open Element
* Hypertech Chip
* Smog pump delete

Thats all for now!!

 

keep it TBI as long as possible and if that's the restriction, swap it out. 450TQ TBIs have been documented. It was a 383 but was lower on the HP. think it had 300HP.

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-Tas
'89 Formula WS-6

305, TBI, auto, 14x3 chrome flat based open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips....

Soon to be installed:
Hooker 1-5/8" 50 state legal headers, Dynomax 3" I pipe (PN 44063 and 43248), Catco 3" cat, and injector spacer.

Super GRK_Taz World
F-Body Dual Exaust
EFI & Intake Options
AOL IM: superGRtaz

 

thanks, anyone else. i would also like to still have some horsepower. i could settle with a 383 but would still want the same power requirements. is this possible or am i dreaming. would a carb be cheaper than all of the tbi upgrades (spacers, high flow tbi, matched injectors) what about the turbo city high volume tbi fuel pump, will i need that? Thanks

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Twells

1992 R.S. 25th Anniversary
* Borla
* Open Element
* Hypertech Chip
* Smog pump delete

Thats all for now!!

 

If i did all of the free tbi mods and the turbo city upgrades (minus the high flow tbi) and put a stout 383 underneath it would that modified tbi system support it ok w/o engine codes or performance problems.

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Twells

1992 R.S. 25th Anniversary
* Borla
* Open Element
* Hypertech Chip
* Smog pump delete

Thats all for now!!

 

Your stock TBI will not flow enough for a 383 even with the ULT TBI mods. The Holley 670 Cfm however and a custom chip can make it run in my opinion, for now the TBI mods will make a big diffenece with a complete exhaust.


Brian

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1989 Camaro RS

305 .030 over Hydro Pistons
Vortech heads milled to 58cc...Performer RPM intake....LT4 cam..Crane Gold rockers...FastChip custom chip...ALum. Driveshaft...3.73 gears with Posi...underdrive pullys...Rebuilt 700R4 with Vette Servo and B&M shift Kit...MSD ignition...A/C Delete No SMOG junk....1997 SS leather interior...B&M Shifter... Ultimate TBI mods...14X3 K&N open Element Non-Drop...Hooker headers....3" exhaust with Flowmaster Cross flow 16X8 Wheels from 97 RS Spohn LCA's Spohn Panhard Bar..LETS PLAY FORD!!

www.geocities.com/feltsb

 

Carb would be way cheaper in the short-term. You might see enough of a return of your investment on EFI in the fuel economy to justify it, though. I haven't tried it myself, but a 450+hp TBI setup sounds like a pain in the butt.

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No guts, no glory.

 

Define "as little money as possible." I've put over $5k into my 383 which makes around 460/460. That is my "little money" - what's yours? Don't think that you'll stick to a budget because you never do. Plan out your engine, get parts cost, then add 40% at least to cover "incidentals" - also known as the "while I'm here I might as well"'s...

Darth Steve