Just finished putting the finishing touches on my Megesquit F.I. system this weekend. I started it for the first time Sat afternoon, and spent the entine day today getting all the settings just right in the ecu. It works EXCELLENT. So far all I can do is free-rev it on the engine stand, but it idles like a purring kitten, and starts up with a stab of the start button, after much tunning. The engine (355) will be installed in my 88 2500 Chevy pick-up for drivability tuning, and permanent use. I assembled everything myself, the ecu, relay board, stimulator, wiring, injectors, custom intake and throttle body, fuel system, all of it. The fuel rails were built by me with 3/4 tubing, custom injector bungs (made by me) and the mounting of the fuel pressure regulator. The intake is a Holley Street Dominator spread bore single plane intake, purchased at a swap meet for $60. I mounted injector bungs in the ports by drilling 3/4 holes, and epoxying (JB weld), my special made injector bungs in to it. The throttle body is a modified 1987 MCSS CCC carb, I JB welded all the passages and holes, removed the choke horn, removed the venturies, removed the secondary air valve, removed all internal parts except the T.P.S. sensor. The injectors and fuel pressure regulator are from the 1989 Olds Quad 4 engines. All the senosor, and injector connectors were scavenged from the salvage yards. Fuel pump is after market for Fuel Injection sysyems (max 125 psi), but My system only uses 43 psi. It was Free from a Friend. After I learn all the ins-and outs of the tunning part, I am going to build another system for the 455 in the Regal!! Pictures of the engine are here: http://community.webshots.com/album/143609563JsJMpB?923 If for some reason the link does not work, goto webshots and do a search for user "4speednova" and goto the Megaquirt F.I. album. More to come after installation in the the vehical. ENJOY! Supernova455
That is great. I am curious to know how much experience you have with FI- people occasionally ask me about the Megasquirt, and I've always kinda guessed that it is a good system for someone who is very familiar with FI, but a first-timer might want to try something else. Would you agree? -Bob Cunningham
Megasquirt is the first F.I. system I have ever built. All it takes is doing some reaserch, and following the insrtustions to the MS system. The instrustions are very good...eeerrr correct. I enjoy the challenges of doing somthing new.
Kudos to you! Enginuity and willingness to take a challenge always draw my admiration. Please make it a point to keep us posted on how the installation and tuning progress.
It's about time someone did this! If I had the money, I would be doing the same thing. Thanks for sharing it with us.
How did you go about finding the right parts? I guess it would be a little easier using a small block- the fuel delivery requirements aren't nearly as high (read: expensive). I could handle the soldering and stuff no problem... I've been doing that for the last 10 years. I also design PC boards and do some circuit design at my job, so I have a lot of electrical experience. I would be lost when it came time to go hunt through the junkyard. Clint, Why do you say that about the SPX? Is it because they have a place for the injectors cast into the manifold? I know I'd love to have that setup on my stage 2!
Yup. To get the bung placemnet right on a regular SP1 without any help requires a fair bit of paid work. About $500 USD + 275 for the SP-1. Now it's down to $375, and the injector placement is correct!
Cool! That could help justify the cost of buying the new manifold. Man, if I only had the $$. As it is, I will be lucky to get the car finished.
Very interesting !!!!!! I am glad you posted pics as well, as some of the other members said, thats time well spent. I actually have a friend who has a complete idea on how to do FI on a 455, using most of the parts from 350 chevy FI, 231 v6, and a holley FI system. There is talk between us to start this year on one for my pickup as well. and of course if it works, I would keep all informed. :grin:
Yeah, my car will be getting one of these systems eventually. The plan is to have a 550hp stage 2 with power brakes, fuel injection, and a gear vendors overdrive unit. Should be able to drive it anywhere!
Well, it's up and running, quite good too! I have worked most of the VE table to perfect. New pics are up. I know it's not a Buick, and I know it's a Chevy pickup truck, buy I needed somthing to test it out on first before I built a system for the 455 in the 86 Regal. Check out page #2 http://community.webshots.com/album/143609563JsJMpB?923 dean
WOW!!!! Nice pics.. I wish it were pics of a 455 with headers in a 88 chevy.. I am doing one in a 90 and I do not think headers will fit, the frame rails are very different than the 83 it was in, and that was tight.. Anyone done this swap with headers?
I built a megasquirt for my turbo camaro a few weeks ago too. It's working out great so far. This car was EFI to begin with so it didn't take as much work as a carbed car would to convert. But it did clean things up fuel wise a lot. Before I was just using a pressure regulator that rased fuel pressure with boost to get more fuel. Now I can run large injectors, tune them to where I want, and still have a nice clean idle... And don't think I haven't thought about putting this thing on the 430 :Brow:
I had one problem since i'v been running the MS. I ran it out of gas! I has been running great, and starts every time no matter what the temp. or weather. The engine makes so much low end torque that I don't need an idle compesator even with the a/c on full blast and sitting still in gear, and that is with a single plane intake manifold. Throttle responce is superb to any carb I have ever had. All I have to do now is set the table to achive better fuel economy (I have a heavy right foot). I will be starting to modify my T/A manifold on the 455 in the Regal for injector bungs to build a similar system for it. I have definatly been bitten by the F.I. BUG! Dean
Great news Dean. I've been thiking of buying a pre-assembled unit and getting started on it for my Skylark. I'll have the manifold drilled and bungs attached before the new intake goes on at the least. Can you do a breakdown of total investment on the project?
