Who reprogramed your computer? Did you buy their wiring harness or have yours revamped? How expensive was it? I'm leaning toward Street and Performance but would like feedback from a few others and what you're using. Thanks

 

My car came with a LS7 and has a computer/wiring harness from Street & Performance. Everything works great with the engine. I'm not sure what the total cost is, but I believe the computer is around $400 or so. Mine came with an additional tune allegedly bumping up the HP from 505 to 570. I haven't had the chance to verify this.

 

Street & Performance is an excellent place to get your harness from. They are not the cheapest around, but there knowledge of swapping LS engines into anything makes up for the cost. I have used two of their harnesses and they are a great quality. The owner Mark will talk with you on the phone about any issues you may have. I think they make some parts for the C2's also, like a crossmember, headers, and a clutch master cylinder bracket. Good luck with your build!

 

Thanks guys. I have spoken to Mark. I was just wondering if there were any other notable companies worth looking into.

 

we used the computer that came with the engine. the comp and pedal were out of
a caddy. dale at tachitup in dayton ohio tuned the engine. the ls3 and comp stuff
came from pace. jim

 

A couple of names that I have heard good things about are Speartech and PSI conversions. From what I know both of these companies have great reputations and can build you a custom harness to run your eelectric fans and kick on with A/C. Go over to LS1 tech and look around in the conversions and hybrids section, there is some excellent info there. I don't really like the other parts of that forum because people don't always have a great attitude, but the conversion section has alot of friendly people hanging out. The engine secton has some great info if you want to build your motor up.

 

Here are three companies that offer wiring harness w/ computers for LS motors going into midyears.

http://currentperformance.com/LS2.html $1100 for LS7 wiring kit
Street and performance 479 394 5711
Fred's electric 877 255 6249

 

Thanks again guys I've spoken to Speartech today. They were also very helpful.

 

Current performance did mine. Jared is a great guy and always has a quick turn-around. I bought an ECU and custom harness from him. He even easily handled my oddball configuration, LS2 w/LS6 intake and TB on 24 tooth reluctor! Later, when I switched intakes, all it took was a phone call and 2 days later I had the modified harness extensions I needed from him to make my new setup work with the same ECU.

 

oh, and to answer the first part, who tuned it, well I had it done locally on a dyno and recommend you do the same! not sure where you are located, fill out your profile for even better help from CF members!

 

I have used John Spears at Speartech, on several cars, and his harnesses and tunes have always been spot on. He builds nice harnesses, and can make it however you want it. He has done thousands of harnesses and computer tunes, and is always innovating. He was the first person to offer a harness for manual shifting of the GM 6 speed automatic trans. I was building a car with one, and at that time, the only way to do it, was to install a Body Control module from a donor car, as the tap-up/Tap-down shifting used the BCM. John made a little stand alone module that worked like a charm! A very knowledgeable guy, who can help you troubleshoot almost any engine control issue.


The current project uses a GM "connect and cruise" drivetrain. It will be interesting to see how good the tune is on the ECM. The harness is clearly not as nice as John's harness, since GM is making a "one size fits all" harness, but it went in pretty good. The nice thing about the GM harness, is that it comes with a complete fuse/relay center that mounts in a drip-proof box, under the hood. Only a small number of wires actually go into the passenger compartment. With past harnesses, I always had to make room for fuse panels and relays inside the car, and because space was so limited on a Corvette, they were not always easy to get at to troubleshoot. With the GM setup, you can check all the fuses and relays, by just popping the top off the fuse/relay center under the hood, just like a modern GM vehicle.

Regards, John McGraw

 

Thank Mikey and John.

John , I would like to stick the ecm and tac under the dash but after looking at my stock Vette, I really can't see any good place to put it and have any easy access to it. Plus if you add a Vintage Air unit under there I would assume it takes up all the pass side. I thought about maybe between the radio and the firewall. Where have you put yours if I can ask?

 

I placed my ECM above the battery on the right hand side. I also use vintage air. Here's a link to where/how we did it. Let me know and I can send you additional pictures

http://64corvette.landkamer.net/2011...-all-together/

 

I used a hole cutter to thread the ECU harness into and place the ECU behind the kick panel. The engine harness comes out above where the battery should be. I moved the battery into the trunk.

 

I put my ECM on the driver's side firewall, back under the fender. It is almost hidden from sight. I mount it with ribber well nuts, as it is almost impossible to get nuts on the backside in this area. The mounting screws go into the plenum that comes from the cowl vent. Of course, this is the current generation controllers, that are tiny by comparison with the LS1 generation of controllers. The LS1 controllers are huge, and finding the space for one is more difficult. Last car I did with a LS1 controller, was a a 59, and I mounted the ECM to the top of the splash shield, where it was easy to remove and access, as well as protected from splash.

I really like keeping all this stuff in the engine compartment, as space is at such a premium under the dash.


Regards, John McGraw

 

my ecm is on the passenger side firewall in the engine bay. my fuse block was in the fender area there, but it has since been moved to the compartment behind the passenger seat, along with the battery.
reality is, you don't need to access the fuse center much, so you could velcro it to the tunnel behind the radio like you suggested. plenty of room, and with velcro plus a little extra loom, you could just remove a radio side panel to reach it and pull it out to access the fuses.

 

We have done 19 LS based swaps over the last 6 years, working on number 20 right now. I have used Current Performance in the past with great results, Jared has an amazing wealth of knowledge and his ability to troubleshoot over the phone is nothing short of amazing.

If you are a little more ambitious I would suggest you try to build your own engine harness, it's not as hard as you might think and you can build a harness that will fit your car however you want it to. The main advantage is that you can hide the harness, most of it anyhow. The premade harnesses will get you going but I have never been totally happy with the wire routing, and I hate the GM split loom.

As for programming I have used Current Performance in the past with great results but for the last few swaps I have used this guy http://www.lt1swap.com/programming.htm. He charges $75 for most reflashes and the start/run tunes have been excellent out of the box even with forced induction. His site has a wealth of information if you want to try and make your own harness.

I have not had any luck with anything Street & Performance offers. My personal bad experiences include accessory drives, headers, MAF sensors and swap kits.

 

I've talked with the guy at LT1 Swap and i'm going to send him my stock GM harness and PCM to rework. Seems like a nice guy and very knowlegable. The price is reasonable too.

 

biggd, What is he getting to redo you harness if I can ask?

 

Actually he told me he stopped doing harnesses due to time constraints. I found another guy that's going to do the harness and PCM for $450 Go to LT1350.com in Erie PA.