TPI to Carb electrical swap
Thread Starter
Heel & Toe
Joined: May 2008
Posts: 22
Likes: 0
TPI to Carb electrical swap
I've recently just swapped my '90 L98 to a carburated setup. After I did that, I realized that after removing my computer I'm going to have to rewire some of the car. What exactly does that entail? and how am is it supposed to be done?! lol. Any help would be greatly appreciated.
Safety Car
Joined: May 2006
Posts: 4,290
Likes: 140
From: Salem NH
I've recently just swapped my '90 L98 to a carburated setup. After I did that, I realized that after removing my computer I'm going to have to rewire some of the car. What exactly does that entail? and how am is it supposed to be done?! lol. Any help would be greatly appreciated.
-- Joe
Thread Starter
Heel & Toe
Joined: May 2008
Posts: 22
Likes: 0
I'm still working on the buildup, so I don't know about the speedo yet. I disconnected the ECU because I've got a new MSD ignition that should handle that job fine, but what else am I going to have to worry about with changing to a carburated setup?
Thread Starter
Heel & Toe
Joined: May 2008
Posts: 22
Likes: 0
Safety Car
Joined: May 2006
Posts: 4,290
Likes: 140
From: Salem NH
The speedo is wired into the ECM, which then sends a modified signal to the CCM, which runs the LCD on his dash. The speedo will not 'work' as in read roadspeed or increase miles, my question to him was did it even illuminate when the CCM lost connectivity to the ECM or did it go into error mode. I'm thinking it probably reads the odometer since he still has the CCM in place but is flashing 'sys' on the DIC. Unless he wires the VSS to provide a 4k PPM signal on pin E2 of the CCM it won't work.
-- Joe
Safety Car
Joined: May 2006
Posts: 4,290
Likes: 140
From: Salem NH
-- Joe
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!
Joe Kucinski
7 Bolt-On Upgrades From Extreme Online Store to Level Up Your C6 Corvette
Pouria Savadkouei
Safety Car
Joined: Apr 2004
Posts: 4,532
Likes: 7
From: Lahaina Hi
Leave the computer.
The computer you need for the in fuel tank pump,the gas gauge the oil presure ,the volts,and so on.
If you want to remove the ecm then go ahead ,you just have to hook everything up on different gauges and redo your dash.I just left mine in place and hooked up my temp ,oil,and all that ,which is the same as factory.Why make work for yourself.
The computer you need for the in fuel tank pump,the gas gauge the oil presure ,the volts,and so on.
If you want to remove the ecm then go ahead ,you just have to hook everything up on different gauges and redo your dash.I just left mine in place and hooked up my temp ,oil,and all that ,which is the same as factory.Why make work for yourself.
Melting Slicks
Joined: May 2007
Posts: 2,382
Likes: 2
From: Kathleen FL
Because I'm also replacing my dash with analog guages, I've taken out the ECM because it eliminates a ton of wiring. I'm gonna be making a custom dash and door panels. Should be a nice streetable race car. I'm thinking that the car should weigh in at 2700 lbs because the entire dash, interior, radio. speakers, carpet, panels and A/C are gone. All the wiring that was in the car originally was totally sickening.
Drifting
Joined: May 2005
Posts: 1,302
Likes: 1
From: Tomahawk WI
Because I'm also replacing my dash with analog guages, I've taken out the ECM because it eliminates a ton of wiring. I'm gonna be making a custom dash and door panels. Should be a nice streetable race car. I'm thinking that the car should weigh in at 2700 lbs because the entire dash, interior, radio. speakers, carpet, panels and A/C are gone. All the wiring that was in the car originally was totally sickening.
