Lt1 Dfi
Thread Starter
Le Mans Master
Joined: Mar 2000
Posts: 8,950
Likes: 4
From: Lafayette LA
Lt1 Dfi
My dog chewed up my factory wiring harness, so I'm now considering a DFI. The car is track only and gutted, so I'm not worring about emissions, A/C issues or factory gauges.
Anyone make a plug and play DFI system for a '94 LT1?
Anyone here using a DFI system on their LT1? If so, is the system batch fire or sequential? Does it use one O2, or two? Is the harness long enough to mount the computer inside the car? Any modifications for using the electric fans?
Any information is greatly appreciated.
Anyone make a plug and play DFI system for a '94 LT1?
Anyone here using a DFI system on their LT1? If so, is the system batch fire or sequential? Does it use one O2, or two? Is the harness long enough to mount the computer inside the car? Any modifications for using the electric fans?
Any information is greatly appreciated.
Safety Car
Joined: May 2003
Posts: 4,283
Likes: 0
From: Houston Texas
White Racing Products made my plug n play Fast system with wide band. You could also get LT1 edit for your car. I think Kurt is one of our supporting sponsors too. Also if you look up TJWong, a member, he gets DFI's for real decent prices. He is a tuner out of Portland also.He really knows his stuff.
Melting Slicks
Joined: Jul 1999
Posts: 2,875
Likes: 0
From: Olive Branch (Memphis suburb) MS
Cruise-In II Veteran
I got mine from TJ. Give him a call for any tech questions. Jeb Burnett did the install along with the Delteq (as well as modifying a opti by taking out the rotor). 
Melting Slicks
Joined: Mar 1999
Posts: 2,535
Likes: 2
From: Rochester NY
contact TJWong for dfi stuff, he will get you the best price I've found. I got my DFI from TJ. You can buy the wiring harness to use with your factory ECM. But the system is not a Plug N play, you will need to have some kind of knowledge in testing electrical etc. When I got mine, I was in a total lost in hooking this thing up. I got a buddy help me do all the install and took about 8 hrs by the time all said and done. It was his first timer. Experince guy will probably take 4-5 hrs to do it.
I mounted my DFI box in the front tire wheel wall and covered 1/2 of the box by a sanwich bag. This is to prevent any water getting into it.
I mounted my DFI box in the front tire wheel wall and covered 1/2 of the box by a sanwich bag. This is to prevent any water getting into it.
Last edited by Bruce; Feb 10, 2007 at 05:23 PM.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
contact www.vette2vette.com for a used engine harness.
The DFI looks like an interface, not a replacement. So that won't help much. I don't think that Painless has caught up yet.
The DFI looks like an interface, not a replacement. So that won't help much. I don't think that Painless has caught up yet.
Pro
Joined: Jun 2004
Posts: 520
Likes: 2
From: Mandeville, LA / Clemson, SC
Can someone explain exactly what the DFI does and the benifits of it. I know it take a radical enigne to require it but i just don't get exactly what it does. If it doesn't replace the stock computer, how do they work together??
Thanks,
Jeff
Thanks,
Jeff
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
For those wanting total control and programability the DFI or other aftermarket EFI system is the answer. These are usually installed so that the original ECM or PCM remains in the car to keep the CCM happy. To do this all one has to do is to share a few siganls between the CCM and othe new DFI ECU, hence the term piggy back. With the programming tools that are now available only the more radical engines would require a DFI system.
Thread Starter
Le Mans Master
Joined: Mar 2000
Posts: 8,950
Likes: 4
From: Lafayette LA
So the accel DFI can be run as a piggyback as shown above, or as a stand alone replacement?
I have no need for the CCM, so I would not need a piggyback. Other than engine management, the only computer system I plan to keep is the ABS.
I have no need for the CCM, so I would not need a piggyback. Other than engine management, the only computer system I plan to keep is the ABS.
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Thread Starter
Le Mans Master
Joined: Mar 2000
Posts: 8,950
Likes: 4
From: Lafayette LA
I also have a Delteq that will be installed along with whichever route I chose.
Pro
Joined: Jun 2004
Posts: 520
Likes: 2
From: Mandeville, LA / Clemson, SC
Jeff in the late model C4s from 1990 and up. There is a CCM behind the dash that communicates with the PCM or ECM. It runs the body functions such as the instrument cluster, and HVAC system. It also sends information to the cluster such as the fuel gauge and other gauge funtions. If you remove the ECM or PCM completely and substitute the DFI box for engine fuel and spark management, the CCM will not be able to talk to a ECM or PCM that is not there. Then it will loose its ability to do its job to control the HVAC and other sub systems.
For those wanting total control and programability the DFI or other aftermarket EFI system is the answer. These are usually installed so that the original ECM or PCM remains in the car to keep the CCM happy. To do this all one has to do is to share a few siganls between the CCM and othe new DFI ECU, hence the term piggy back. With the programming tools that are now available only the more radical engines would require a DFI system.
For those wanting total control and programability the DFI or other aftermarket EFI system is the answer. These are usually installed so that the original ECM or PCM remains in the car to keep the CCM happy. To do this all one has to do is to share a few siganls between the CCM and othe new DFI ECU, hence the term piggy back. With the programming tools that are now available only the more radical engines would require a DFI system.
Jeff
Melting Slicks
Joined: Jul 1999
Posts: 2,875
Likes: 0
From: Olive Branch (Memphis suburb) MS
Cruise-In II Veteran
Thread Starter
Le Mans Master
Joined: Mar 2000
Posts: 8,950
Likes: 4
From: Lafayette LA
