C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

ECM needed?

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Old Apr 4, 2009 | 09:12 PM
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Default ECM needed?

Ok. Do I need the ecm hooked up for anything if I am going to go to a carbureted motor. I am getting rid of the fuel injection. I am going to replace the l98 with a 355 that I have already built. I understand that I need a TV cable and a fuel pump. Is there anything else I need?

P.S. Look at the fore sale forum if you need any sensors or injection parts for the 85....Most of my stuff is new, I just cant figure this motor out!
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Old Apr 4, 2009 | 11:43 PM
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You may need a carb style distributor also.
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Old Apr 5, 2009 | 12:36 AM
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Leave ECM to run gauges and speedo unless going analog gauges. Just remove redudant wiring leaving wires to sensors
Need non computer controlled dist; regular HEI
Can use 84 CFI low pressure intank pump
If auto ,need some means of controlling TCC lockup .Good T700 control info here
http://purplesagetradingpost.com/sum...o/700R4p1.html
Read
http://forums.corvetteforum.com/c4-t...85-c4-fan.html
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Old Apr 5, 2009 | 01:11 AM
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I can just remove the intake and fuel injection right off the top and put a regular intake on the same motor cant I? If I dont want to change the whole motor?
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Old Apr 5, 2009 | 01:20 AM
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So long as it is a low profile intake with drop base aircleaner
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Old Apr 5, 2009 | 01:37 AM
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Ok cool. So can I use the fuel pump in the tank or will I have to remove it and put an extrenal on?
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Old Apr 5, 2009 | 02:26 AM
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Originally Posted by buddylee432
So can I use the fuel pump in the tank or will I have to remove it and put an extrenal on?
You can use a 84 CFI intank pump OR a aftermarket bypass regulator monted in the engine bay using the original return line
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Old Apr 5, 2009 | 12:43 PM
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Do you also plan on going to mechanical brakes and crank start?

Geez....the TPI is an easy system to diagnose and repair, all it takes is a manual, a few inexpensive tools, and a systematic approach.
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Old Apr 5, 2009 | 08:01 PM
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Well I didnt want to get that started.... Its not like I am going to a Ford engine or anything. I just dont have the money with a new child to be spending anymore trying to FIGURE OUT my TPI setup. So as I always say, you spend your money the way you want and I will do the same. Anyways, thanks to you guys that have been a help!
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Old Apr 8, 2009 | 04:31 PM
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What size carb should I go with. The rebuilt motor has a slight cam (not much more than stock) and small dome pistons. Would a 700 double pump holley be too much?
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Old Apr 8, 2009 | 06:20 PM
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Default holley

Originally Posted by buddylee432
What size carb should I go with. The rebuilt motor has a slight cam (not much more than stock) and small dome pistons. Would a 700 double pump holley be too much?
Do you already have the 700? I have a 750 DP on a BBC and it fulfills its needs. May be a little big. Maybe jet it down a little bit.? Good luck.
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Old Apr 8, 2009 | 07:47 PM
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Originally Posted by buddylee432
What size carb should I go with. Would a 700 double pump holley be too much?
Unless you are after all out performance a Vac secondary would be more suited to street driving and more economical considering your lack of $$$
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