GM OEM TBI up to 420hp?

[Shannen Durphey]

Hey, long time no Z.  Lotsa new info since you've left.  Things are
more user friendly now.  Have you looked at Tunercat's site?  Or
talked to Terry Kelley?  Good editors available from both.  I like
Terry's stuff, personally.  $250-300 could get hardware and software,
if you do some shopping.  I think I'm paying $2/prom.  Maybe $1 each. 
I'm not so sure, but it's cheap.  I use a place called Mentor
Electronics, in Ohio.  It was first mentioned by Mike V., a while
back.

Watch for the Edelbrock SY-1 intakes on Ebay.  They kinda come n go. 
The 84 Vette has a similar manifold, but with smaller ports and single
bbl tb's.  In stock form, they're better for smaller displacement
engines.  Mine works well on a 302 chebby.  

No gm vehicle has been released with a 4bbl tbi setup.  Might look at
turbo city for ideas on a dual 2bbl intake.  But don't look at the
prices unless you're sitting down.  

You'll spend lotsa money to get a reprogrammable ecu, GM stuff is dirt
cheap by comparison.  

I dunno about those throttle body airflow ratings, they seem a bit
optimistic.

I'd expect you to be looking for traction control. ; )
Shannen
 
Ross Corrigan wrote:
> 
> Well I have another question, I never did see my first one "converting carb
> to an 'airdoor'" make it to the list but I did get one reply.  While I'm
> waiting for a good programmable ECU to show up my interest in starting with
> an OE GM TBI setup is growing. I've read the 'programming 101'  and 'what
> you need' and it looks to me like one can spend $200US on hardware and then
> combine software and you can start tailoring your own EPROM's
> correct?  Looked like software editing app's have come a ways since I last
> thought about this a few years ago as well.
> 
> Is their an OEM GM 4bbl TBI unit that will flow enough to support a roller
> 350 with 420'ish flywheel hp? And naturally will the injectors feed it and
> if not can they be upgraded and at what cost? I came across a kewl setup on
> a sbc 350 cross-ram intake w/ dual 2bbl's described as follows that I'd
> like any input on (not sure on writer's experience as car his car hasn't
> seen much use yet and this is a new venture for him). Haven't scared up a
> low rise cross ram intake yet but who knows....
> "The Tbi.'s I am
> using right now are off of a 2.8 V6 and flow 360+ cfm. each from the
> factory and
> can be reworked to over 400+ cfm each. The 5.7 Tbi.'s I have as backups in the
> garage flow 620+ cfm. factory and can be reworked to over 680 cfm. I am
> starting
> small to see if I need more flow or not. The 2.8 should be fine for the
> combo I
> have so I see no problems on the horizon. The wiring
> harness is off of a 305 chev. half ton. All you need to do is split the
> wiring for
> the Tb.'s for the second set. The drop in voltage does not effect anything
> as it
> takes only a small amount of voltage to fire the injector. "
> 
> Been informed of an '84 vette with full EFI available but doubt it has
> anything suitable for my needs?
> 
> Thanks in advance for any info, the documentation on the websites is great
> and kudo's to everyone's efforts!
> 
> PS Did I read right that EPROM's etc are only $1 each?  I called our local
> electronics wholesaler and all his prices were tenfold higher on everything
> so digikey is looking good:-)  ie. if I buy 10 EPROMS I should be able to
> burn my trials/erase and reburn on same chips saving a few for various
> configurations right?  It read quite simple on website and just want to
> verify that. The interpretation and reprogramming I know is more involved
> with skilled interpretation. Any recc'd reading for being more aware of
> skill for interpreting/rewriting the chips?
> 
> Ross Corrigan
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