I looked at your site, is the progress up to date on there? I am curious because I need somethin to feed my 400sb Thanks

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• 412ci/sb

My Homepage

 

It's on hold for a while, brother. I got boned by a local shop a while back that efffed around for six weeks instead of installing my 383. So now I'm sitting on a bunch of parts and an engineless and transmissionless TA. The biggie for you is going to be getting the computer to work. If you go with a Haltech you should be okay because it has four seperate injector drivers. Anything else and you're probably looking at getting some auxiliary drivers to work with the stock ECM. Then you're spending time learning how to burn/modify your own PROMs. You would probably be okay for a good while using a 454 TBI and custom chip until you/I get the "duallie" working... That's what I'm running until I get a handle on the programming of the Haltech. Once I'm fairly sure I'm not going to blow up my new $4000 engine I'll revisit the dual TBI issue.

Steve

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Steve's Trans Am Temple

 

I was under the assumption that the 7747 ECU could drive 4 GM TBI injectors. I know it's apples to oranges, but the Edelbrock MPFI Conversion kit for trucks makes the 7747 ECU drive 8 injectors. They are low-impedance, I believe, but there still are 8 injectors.

I also heard there were several guys doing this sucessfully??? wasup?

 

Hey guys, I know this isn't a cheap solution but it is the cheapest and probably the easiest ecm to tune, it,s windows based, and will accomodate four injectors or eight injectors with there auxiliary driver kit. Check it out here. The Holley950Commander.http://www.holley.com/HiOctn/ProdLin...I/534-120.html
I hope this helps some. I'm thinking with my setup I may have to use it also.

Steve

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91RS, 4L60 w/B&M Megashifter, 350vortec, 9.4cr,Combustiom chambers and pistons polished and coated w/ techline thermal barrier coating, LT4 Hot Cam Kit, RPM Air Gap, 454TB w/350injt, Headman shorys, 3" catback, 323posi, did I leave anything out?

[This message has been edited by steve8586iroc (edited April 07, 2001).]

 

What you making, anyways, Steve?? Dual TBI? MPFI???

 

I just thought this would be an easy way to tune on the run. Is it posible to keep the cruise control without using the stock ecm to control engine functions?

Steve

 

I'll eventually run twin Holley 670 TBI's. However (and it's a big however), that is after I get comfortable programming my Haltech and am sure I'm not going to blow it up. The only hang up is whether or not the Haltech can drive four injectors. I should be able to control two IAC's by halving the amount in the maps, and splicing the two together. I only need one of the TPS's for it's signal; the other set of throttle plates is controlled by dual quad linkage. I may just save this entire mod until I get the twin turbo's installed as it may be a bit much for my NA 385.



Got this Edelbrock Dual Quad manifold for $80 off of ebay, hogged it out, made a "spacer board" to bolt it up and voila! Dual TBI.



Steve


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Steve's Trans Am Temple

 

twin 670's??? What the heck you runing for a combo? Man, that's a lot of airflow!!! Enough for a 502/502!!!

 

Fastbroker: Remember, those 670's are 670 cfm at 3", not 1.5" like carbs. You are right about the TBI computer and 4 injectors. I'm running this setup myself with my holley 4bbl. The injectors get wired in two sets of two series circuts for the TBI style injectors... 2 sets of 4 in parallel for multi point setups.



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1988 T/A,
9" Ford, 3.50 gears, Auburn posi, 700r4 -w- 2100 converter
350 .060 over with forged 1 pc rms crank, and forged TRW pistons, 9.5:1 cr
Factory GM heads Pocket ported, 2.02/1.60 valves, back cut
Lunati roller 219/227, .479/.480, 112 LSA
Holley 700cfm 4bbl on TBI truck 7747 computer and chip by Howell-EFI
Edelbrock Performer EGR intake, Edelbrock TES and 3" cat

 

Dan W, Are you running the 7747 ecm with 4 tbi injectors? I have been looking in to this for my engine. I would like to know if it is doable or not with the 7747 ecm.

 

Yes I am and yes you can.

You didnt ask but for applications under 400hp, a 454 TBI unit would be a better choice.

[This message has been edited by Dan W (edited April 15, 2001).]

 

If I remember right, Turbo city uses 1 IAC for both TBIs.

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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
EFI & Intake Options
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