Anyone every tried adapting Chevy TPI electronics onto a Buick v-8. It seems like it wouldn't be that difficult, especially if one was to use an older system utilizing an HEI type dist.
tpi (tuned port injection?) or TBI (throttle body injection) the tpi would more than likely take a lot of work to get it to fit. (relocating the runners). a TBI would be a bit easier mechanically electrically it would be less of a headache to go with an after market computer than a factory computer. for a 455 a tbi from a 454 truck could work ok but not performance orientated. and not looking for anything spectacular. to do it right would be to use an aftermarket computer. i believe there are a few threads about a TBI onto a 455 with your same question. -nate
TPI, drilling a dual or single plane intake for injectors and adapting the TPI thottle body to the carb flange. Not familier with the aftermarket computers, but I see how that would be easier and cleaner on the install. I was assuming to use a GM ECM with a programable piggy back to alter fuel and timing. Nothing in the works, just pondering.
Don't know about Chevy setup, but, a guy in New York had a EFI on a 455 in a older 4 door. I saw it at a Buick Race in Cecil County several years ago. A real sleeper. Diver
gsdave, I fabricated everthing. The engine is a 1970 462 in my 86 Regal. I use a Megasquirt ECU to control the fuel, ignition is handles by a standard HEI. The top picture is with the BBK TPI 58mm throttle body for 1988 F-body,30lb injectors, adjustable,boost referenced pressure regulator, custom fuel rails, modified T/A SP-1 intake manifold, custom fabricated sheetmetal "airbox", K&N airfilter. The lower picture is the same only instead of the BBK throttle body, I modified a CCC q-jet to function as a throttle body and bolted it directly to the intake. Boot work EXCELLENT! Dean
Dean, I've been wanting to talk to you about that but didn't know whos engine I was looking at. How does the q jet work for a TB, did you strip out any of the insides? also what did you do for a TPS and IAC or did you use the idle solenoid? I too am going with a MS. but i've been running into $ and parts roadblocks as vendors taking their time. Thanks again, Nate
Dean, thanks for the info, I am in the begining stages of doing a twin turbo 350. I am working on the headers first. Was planning on doing a blow thru carb in the beginning but you never know. :TU:
Dean,was the Q-Jet used as a throttle body for looks or does the spreadbore arrangement is better than a square one as a TBI unit?Both set ups look clean. Sorry for the hijack.
The lower picture is the same only instead of the BBK throttle body, I modified a CCC q-jet to function as a throttle body and bolted it directly to the intake. Boot work EXCELLENT! Do you have the secondaries linked to move with the primaries? This is the coolest setup I have seen, it would even work well with Ram-Air!!
Hector, I'm wondering that too. although if you look at new cars with their TB's if you notice it has a cam for the throttle cable to change it's speed of opening and approching WOT for the quicker. I'd imagine that the Q jet setup from idle to WOT would have a simmilar response w/o this cam. However, you don't see that on his BBK setup.
In response to some of your questions, I will explain how it works. The CCC q-jet has been completly gutted. The primary venturies have been romoved for smoother, less restricted airflow, Idle Air Valve tower removed, all unessesary openings filled in. Did not have to change much on the secodary side exept remove the secondary air valve, metering rods, and smoothed the bores from less turbulance. The primary and secondary throttle linkage works as normal. Look at the photo and you will notice I left in place the throttle position sensor, which is the main reason for using this type of carb as a "budget" throttle body. Also I left in place, is the throttle kicker solenoid to kick up the throttle when the A/C is on. How does it drive with the CCC q-jet throttle body? Very simular to my Edlebrock RPM 850 Q-jet series carb in this picture. How does the CCC throttle body compare to BBK and "AIRBOX" set-up? The 1150 58mm BBK throttle body with the AIRBOX creates substantial increase in low speed, mid range, and top end torque. The car is actually hard to drive "easy" because it takes very little throttle movement to get the car moving from a stop, throttle responce is UNBEILIEVABLE! Here is another pic. Dean
I need to know more about this! It is so cool. If you don't mind me asking, how much does a system like this cost? Any more pics and details would be great. Especially on the system with the airbox and the BBK throttle body. Brett
Dean thanks for the extra info. Brett, Dean, is running the Megasquirt, I plan on too once i get :dollar: and parts in order. Check out http://www.megasquirt.info/ for information. however there is a lot there so try not to get too discouraged first. you can buy it from www.diyautotune.com I've purchased from there a few times. and they have a great kit with each bag labeled where the part is supposed to go. Remember that this is a DIY kit. So support is thru their forum. (and their pretty good at getting your problems figured out.) the Megasquirt (MS) kit leaves a lot of options on fuel systems, and ignition. However it doesn't YET support Coil on Plug ignition or direct injection, YET. they are also working on electronic transmission control as well and talk now is that it will be controlled by a similar module. Can you say GM 6 speed trans behind a Buick 455? off the top of my head. injectors 8 new = 180 ms kit = 247 test unit mega stim = 45 relay kit. = 64 wire marked for use = 65 AL intake = 150 throttle body (emissions carb came with my 75 engine) = 0 fuel pump = 108 fuel tank 93 caprice = 125 shipped bungs for intake = 50 wide band 02 = 200 ford EDIS module 35 new crank trigger 40 (the 2 above items are avail complete from ebay for about 20-30 bucks) custom machining to crank pulley = 100 (for ignition) temp sensor, throttle position sensor = free from buddies trashed caviler. GM coil packs for EDIS, free =from buddies severly overheated northstar so above is at 1405 i'm missing my fuel rail and all fuel fittings (upgrade factory lines) oh and my adj. fuel pressure regulator. milder builds may cost less such as factory injectors from a more common car(42 lb are from a ford lightning), factory regulator. use HEI instead of EDIS. using factory tank. using diffrent wiring.
This thread got me thinking about a project I started to investigate nearly 10 years ago for my old Goat. I just looked up the website and thought they had a cool project going. Scroll down to the bottom of the pics and you'll see a Vega project powered by BUICK!!! http://rancefi.com/
actually you could make a tpi system work if you use the buick intake and a new throttle body like deans the ecm injectors rails and all that would work you would just have to change the firing order around to the buick by tuning or move the wires around on the injectors to get it right
There are a few software tools that you could use to modify the stock chevy GM ECM without needing a piggyback controller (tunercat, winbin, etc.)
I have used both the 165 mas air and the 730 ecm for this venture. GM ecms are easy to program but had a lot of problems getting the fuel cure were I needed it. I am considering trying the 749 ecm for a turbo 455 Riviera project I am building. (even tho I have a mega squirt system sitting on my desk.) (going to run E85 also) If you need any help I have the programmer and chips and could write a baseline chip for you. And if your going to run a TPI style throttle body, Professional Products make 52 and 58mm models and there a lot cheaper than everyone else. They also carry blank fuel rails. They have an Olds and Pontiac fuel injection system already, maybe we can push for a Buick. professional-products.com
Dean By the way who welded in the injector bosses for you? they look great. I have a lot of big block Buick and fuel injection experience but I can't weld aluminum very well.
