You have a 3.4L right? So you put a MPFI system off of a 3.1L instead of the SFI system that a 3.4L would've come with? Or I guess a TBI system? I would think an SFI system would get you well into the 20's on the highway with overdrive.Had me worried there brah!
Any carb swap versus the stock one is gonna be an improvement! I tell you what man. These trucks don't get great mileage anyway. I've been told by some folks that they could get 20+. I've never seen that personally. I've gotten about 16 at best, and that is with the EFI setup from the 91 that is currently on it! My old 91 wouldn't get 20 and it was almost new when I got it. If you get 16-18 I think you're probably doing pretty good in an old carbureted truck.
I have a regular ass TBI system from a 1991 truck on it. My truck is an 84, so I retrofitted it on there. My truck's engine was never in a Camaro. It's a crate engine I got in 2010 right before they quit making them around 2011. To be fair, it's not tuned. It has 4.3 injectors on it with a bored out stock intake. I'm sure it could be better. I had the 4bbl Holley tuned pretty well though too and it never got good fuel economy either though. Usually around 14-15. Oddly enough, it didn't matter how I drove it or where. On trips it got that. Around town it got that. Driving it like grandpa it got that. Standing on the throttle all the time it got about that. But with EFI you are right....I should be doing at least around 20.You have a 3.4L right? So you put a MPFI system off of a 3.1L instead of the SFI system that a 3.4L would've come with? Or I guess a TBI system? I would think an SFI system would get you well into the 20's on the highway with overdrive.
I checked the flex plate bolts this weekend and realized I couldn’t even get to them with a torque wrench. The torque converter only backed out about a 1/2”. I should have known better. I’ve dint the job before. Just didn’t think it through. On the positive side, I started the truck with the torque converter unbolted and the noise is definitely coming from the flex plate. It has a pretty good wiggle. Looking back, I should have tried to get a wrench in there to snug them up. I just don’t want to break the thread lock on the bolts. I do feel better knowing what the noise is tho. I’m just gonna wait for it to bread and replace it. Should be fine for a while.
Tracked another tank and got 14.6 mpg. Super consistent with however I drive. For tuning, does it matter if I do it with the weather change we’re having? How much does it really effect it?
Cool the hear you guys are talking about EFI. I’m considering it for my Jimmy. Main thing is keeping the check engine light off so I can pass smog. Crazy to think you can take off a pos carb, spend and time on the swap, and still get bad gas mileage. Probably worth it in my case tho considering my Jimmy doesn’t run lol. What’s something like that cost to do on a 2.8 1985? My coworker said forget all that and LS it. Probably not likely.