That's the beauty of Megasquirt. Even the pre-assembled ones are $240-$250. That way you don't have to mess around with soldering it all together. www.glensgarage.com http://www.rs-autosport.com/v2.htm Actually, I just looked at the newer versions and assembled...they do get up to $400...but I'm running the older one and it works great!
seems like a factory gm one could be reprogramed with the buick firing order for 250 bucks and do everything needed could be wrong though. im kinda dumb when it comes to this stuff. i understand the basic concept and the tuning and how to hook everything up. but have trouble with wiring in the tranny and building the boards
If anyone's interested I have one I bought about a year ago with the digital readout but never had time to finish it. It is about 25% assembled and I just don't have any time. $100.00 would take everything I got. Mike
Some good news! It runs! I got it running sunday, and have tuned it to idle, and start up real good. So far, I have it driven down the street, and around the block. At idle and low speeds my fuel map is pretty good. I have not been able to get into the throttle hard yet because I can only make adjustments sitting in the driveway because the battery in my laptop computer is dead, and will not charge up. I will have to by a power inverter to power the laptop so I can motor down the road and tune while someone else just drives the car. I am very pleased with the performance at this point in time. In comparison to the carberator, the throttle responce UNBELIEVABLE! It is very sensative, and very easy to spin the tires when starting from a stop, just somthing I will have to get used to "finnessing" the throttle. More to come after I get my full thottle dialed in. And maybe a short video clip to follow. Dean
The system is running very good now with some tuning. One thing I have found out is that the quad 4 injectors don't seem to be 30lbs units as listed, I think they are more like 17lbs/hr. This is bacause I just could not get the VE map numbers in the ball park where they should. But as I played around with the numbers, and doing some guessing/estimating, entering the the figure of around 17lb injectors, my tuning parameters became realistic, and the perfromance proved it. Idle, throttle responce and low and midrange torque are outstanding, but the injectors just wont supply the demand of fuel needed past 4000rpm. So i have orderd some "real" 30lb injectors from Summit, which should be good for around 400-450 hp. I should be able to have those installed and tuned in in about a week or two. And then its off to the RACE TRACK again!! Dean
That's great that you got it running. Good job! I thought that 30's from a stock V6 sounded big. The stock ones from my 3.4L 94 camaro are 17#/hr. Real 30's should do really well. I went through some calculations with my 430 a while back and came up with 410hp running a 255lph pump, 24lb/hr injectors running at 70 psi fuel pressre. That's at a 13:1 A/F ratio. I also came up with 520hp running a 255lph pump, 36lb/hr injectors running at 50psi with a 13:1 A/F ratio. One thing I noticed with your intake setup...do you think 1/4" fuel line is a bit too small? Especially for a 455. I'm going way overboard and running -10AN line(5/8") everywhere. I shouldn't really need that much unless I'm going to be running a monster 500+ in^3 1000hp motor...but you never know :3gears: But from looking at stock stuff, my 3.4L V6 from the factory came with a 3/8" feed fuel line and a 5/16" return line. Just something you might want to keep an eye on.
I first had fuel pressure set a 43.5 psi, which is where the factory quad 4 regulator was set at on the car the injectors are from. I have upped the fuel pressure to 45 at the time being, but have suspended all tuning untill I install the new injectors. The motor runs and drives great, as I had expected and maybe a little better. I just can't get over 4000rpm without my duty cycle on the injectors going to 100% very quicky, and then the motor sounds like it's on a rev limiter. Using Megatune to richen the fuel map just makes the duty cylce reach 100% sooner, and my o2 sensor will still show very low voltage, like .1 or .2 (wide band). It idles silky smooth, and the low and mid range torque is brutal (pushing shoulder blades into seat), I love it!! Dean
Oh, ok. At some point you had mentioned having 1/4" NPT threads in your fuel rail and from the pictures it looked like that front SS braided cross-over hose was 1/4"(-4). But yea, I'd think 3/8"(-6) line would be good for a feed unless you start getting extream. I just wanted to never have to upgrade the engine lines so I went with -10 feed and -8 return...I'll never come close to out growing that.
Just installed my new Accell 30lb injectors, they fit perfect in my custom fuel rails. Finished a little bit of tuning for the evening. They are working perfect, I have been able to tune the idle silky smooth, and have not had a single spit or sputter from it. All that is left now to do is find what fuel pressure they work best at because there was no litirature with them saying what fuel pressure they are rated at. My fuel pressure regulator is still at 45 psi. I might turn it back down to 43.5psi and see how it does. If any one knows what the best fuel pressure they operate at, please let me know. Dean
To my knowledge all injectors are rated at 43.5psi. Although I don't think it's usually that critical since most fuel rail gauges aren't even accurate enough to measure a pressure down to the half psi. You've probably seen this before but there's a little calculator on this page that tells you what an injectors flow rate will be if you change the pressure: http://www.megasquirt.info/v22manual/minj.htm#size I would say set your fuel pressure to some where around 43-44 and tell megasquirt you're running 30#/hr injectors and then tune the VE table with your wideband. I'm using 36#/hr injectors in my 3.4L megasquirted V6 and I'm running ~44-45psi or so and I just told megasquirt that they're 36# and the VE looked pretty good after getting the A/F ratios what I wanted with my wideband. Good luck! And thanks for leading the way in megasquirted big block buicks. I hope to follow soon...
awsome that u got the car running, fuelinjectedf 455s sounds cool, what kinda gas milage do u think you'll be getting when u get it tuned just right? can this be done with a buick350?
I just shot a short vid of the engine, I will post a link as soon as it gets to me from Streetfire. Right now fuel consumption is high, because of all the driving, and throttling to get it tuned. I don't expect great gas mileage out of it, probably about 10-12mpg on a good day, but I have a heavy foot so more like 8mpg LOL. The carb gave me 15mpg on the highway, but does not have near the throttle responce, or push in the seat that the FI gives. Here is a picture of the completed set up. Dean
Sorry if I overlooked it, but where did you get the fuel-rail extrusions from? I ordered the MSD injector pocket drill-bit last week for my K-B Wildcat intake.
I purchaced my fuel rail extrusion from the site below. It takes exactly one foot in length to do each side. I got 4' in case I made a serious mistake I could not fix. I drilled a 3/8 pilot hole, and then used a 17/64 drill bit for the injector hole, then used a 45 degree stone to chamfer the edge to ease injector installation. I used 1/4" npt -6 fittings on the ends, but next time I will use -6 o-ring fittings to ease installation of the fuel hose. http://www.rossmachineracing.com/extrusion.html Dean
