LS4 / F40 swap - fieroguru (Page 79/216) fieroguru MAY 01, 06:22 AM quote Originally posted by ericjon262: so are you just going to wire in a toggle switch for P/N? or the actual range switch? Actual range switch. blander66 MAY 02, 09:37 AM quote Yeah, I could probably have one of the electrical engineers or ET's at work help me set something up (my PLC programming is quite limited, one class in grad school), but I would prefer to find a solution that others could use as well. So I am keeping things relatively simple/basic and will see how far I get with this approach before pulling out the other more technical options. I do a lot of model based controls work and have access to cheaper control modules if you do think to go this route let me know I may be able to write the needed code which would then make this something that could be used on any future swaps with this combo fieroguru MAY 03, 07:04 PM Just been driving the car and working on the SD side of the tune. It runs quite smooth in town and through the RPM range. This car is soooo much fun to drive! I am on vacation for the next week, so I will be doing some more work on the finishing details of the swap. dobey MAY 04, 01:00 PM quote Originally posted by fieroguru: Just been driving the car and working on the SD side of the tune. It runs quite smooth in town and through the RPM range. This car is soooo much fun to drive! I am on vacation for the next week, so I will be doing some more work on the finishing details of the swap. That's great! Hopefully you don't get a week full of cold and rain out there, as the forecast currently looks to be for here. I'm on vacation this coming week as well, hoping to make a little progress on my build. But unfortunately, the forecast isn't looking so great over here. Seems like you'll be putting a thousand miles on your car in no time though. fieroguru MAY 04, 02:30 PM quote Originally posted by dobey: Seems like you'll be putting a thousand miles on your car in no time though. I am real close to having 1K on the swap. Just filled up from the commute/tuning tank and got 17.5 mpg... all the running around at 4K+ and about 7 WOT 3rd gear blasts take their toll on the fuel efficiency. This morning I took the car on a 221 mile trip with 60 miles 2/4 lane and the rest open interstate at 70-75mpg. Sole purpose of the trip was to check the mileage and it averaged 27.3mpg for the trip. The old SBC swap would get 22-23 mpg, so 220 was about the limit of its range, this car did the 220 with 1/4 tank left to go and only used 8.1 gallons. It was about 60ish outside for this trip, so on a warmer day I might be able to get a little higher mpg... but I am pleased with what it is delivering. If I can keep my foot out of the loud pedal, it might get to 20-22 mpg on my daily commute. The other thing I learned today was I need new rear tires. They are the ones from the old SBC car and are 4+ years old. Prior to today, I hadn't gone WOT in 2nd (just 3rd gear), but today I gently launched in first, revved to about 4K and shifted to second and then rolled into the pedal for WOT. About 4K in 2nd the tires just broke loose and the rear started to drift to the passenger side... need more traction. fieroguru MAY 05, 07:49 PM It was raining, so I wasn't temped to take the car out driving, so I backed it into the garage and started taking it apart. One of the projects for vacation week is swapping out the 85mm MAF for the LS3/LS7 card MAF. I started off with a section of 4" tubing and made a shelf so the MAF would have a flat space to mount: Here is the inside of the tube with the MAF sensor installed: Removed the old MAF and test fitted the new tube section: I welded to the tube section to the original air intake tube (fewer silicone couplers and clamps). Once the welds were smoothed, I sanded the tube and applied some more truck bed coating to it: While letting the tube dry, it was time to swap out the connector end since they were different. The good news is it literally is just swapping out the connector end. Here are the two connector ends (LS2 on the left, LS7 on the right). Each one was opened up, the terminals released and pulled out of the housing: Here are the terminals from the harness: The terminals are flipped between the two MAF sensors, so I just had to install the new connector flipped over. The really nice part is the terminal retaining latches are flipped as well between the two housings, so I didn't even need to rotate each wire 180 degrees. Just slide off the old connector, flip the new connector and slide it onto the terminals in the harness... doesn't get much easier. fieroguru MAY 06, 06:35 PM New MAF sensor and modified intake tube are now installed: While the TB was off, I drilled the MAP sensor hole over sized so I could switch back to the LS4 MAP sensor. I ordered the adapter harness, but got an email that it was back ordered. So I ordered just the LS2 MAP female connector end and I can make my own adapter harness with the LS4 MAP pigtail that I removed when I did the harness. Here is a picture of the LS4 MAP sensor installed: While still working in the engine bay, I removed the thermostat that I had previously drilled a couple of holes in. It was taking the car too long to get up to temp and on cool mornings it wouldn't get much above 165 degrees. I also took the time today to prep the A/C system for a charge. I replaced all the o-rings, swapped out the orifice tube and added the R134A fittings. I hope to have the A/C all charged up later this week. Another key project for this week is to make all the yellow disappear... not a fan of it at all. Makes the car look too "ricky racer" and draws too much attention. Time and $$$ are just not in the cards right now to get the car painted vodoo blue, but I can make the yellow disappear. First step was to remove all the stickers (Pontiac, Formula, Fiero): Later this week, some Gunmetal Grey Plasti-dip will arrive and I will use it to cover the yellow painted surfaces. So the car will still have the wide stripe (not really a fan of it either), but at least it will be in a more subtle color and when it is time to paint, the plasti-dip will just peel off. Rickady88GT MAY 06, 09:40 PM So much to learn in this thread, Thanks for the info. Rickady88GT MAY 07, 07:35 PM Is there a PCV valve in this elbow that needs to be replaced during the swap? fieroguru MAY 07, 07:45 PM quote Originally posted by Rickady88GT: Is there a PCV valve in this elbow that needs to be replaced during the swap? The LS engines don't use a traditional PCV valve, they have a small orifice restricter in one of the 2 hard lines coming out of the valve covers. Its more of a fixed air bleed setup.