While doing the usual web surfuring on G-body cars, thru a Pontiac site I found a Fuel Injection company that has done fuel injection on just about everthing, even a Mopar 413 Cross Ram intake! They have done T.P.I. set ups for Olds 455. and Pont 400-428-455, a SFI set up for Mopars, Plus DFI for any eng , even a T.P.I. 426 Hemi! heres their link! http://www.rancefi.com/ I e-mailed him about doing a F.I. system for Buick 455, a T.P.I set up infact. this is what he responded back with. Has any of you guys dealt with him or heard of the business? Just curious Thanks
Ta performance has one Ta performance has been toying wirh FI, and has one, but is custome order only and the price is north of three big ones. Check out the below link, and good luck. eddie http://www.taperformance.com/fuel.htm
Ok let me ask this .... is T.P.I better than / or worse than let's say a direct port injection with a throttle body in place of carb on a intake? Kinda like what Kerry S. is building or T/A's?
um I think in terms of efficency the TPI might be better, but in peak horsepower the multi point, but i am not sure. Hopefully someone more smart than myself will post on this topic. Sorry i can't be any help.
What I've heard Throttle body injection (TBI) is just a few steps up from a carburetor. Think of it as a pair of big injectors spraying fuel into the top of the intake manifold where your carb would be, and you get the idea. You have the advantages of injection in as much as you have controlled fuel metering, better emissions, better fuel economy, smoother running, and good cold starting. However, it is difficult to do much tuning beyond that point because the system is fairly generic. As such there is not a lot of engine-specific tuning that you can do, and your horsepower is limited. As a good anecdote on this point, GM uses essentially the same system for all of its TBI cars, just changing out the injectors to handle larger displacement. This is true to the point that if you swap out the 4.3L in an S-10 for a TBI 350, you don't even have to change the computer. You just install 350 injectors on the throttle body unit, hook up the wiring harness, and it will run. (Had a friend that drove his v-8 S-10 like that for a couple of years.) On the plus side for TBI, it is cheap to build and maintain, and only has a couple of moving parts. It's comparitively low-tech, and very reliable (more so than a carburetor, in some cases). Port injection, on the other hand, is just that. TPI (tuned port injection) systems spray gasoline inside the intake manifold directly at the intake ports on the head. TPI almost always has one injector per cylinder, as opposed to 1-2 for the whole engine with TBI. This injection can be very precisely timed to get maximum atomization of the fuel for optimal combustion. As such, there is more potential for power, as well as more potential for fuel economy and cleaner emissions. For the anal-retentive types, you can even go so far as to tune the mix in individual cylinders (kind of useless in a street car, but if you have a formula one car running 15,000 RPM, those things get important). You can adjust the fuel by having the injectors stay open longer, and this can be fairly easily programmed or reprogrammed, depending on what you are trying to do. Combine this with precise spark timing, and it really lets you do some amazing things. A good example of this is a project Toyota Matrix that Sport Compact Car magazine put a turbo on. On the surface that may not sound all that impressive, but when you figure that they got daily driver reliablility on 92 octane with a car running 11psi and 11:1 compression, it's a big deal. That sort of thing could only be accomplished with precise fuel delivery and spark timing; try that with throttle body or a carb and you'll end up with a grenade between your fenders. To get off on a tangent, you can actually have both systems in the same vehicle, if you have the electronics to handle it (and a reason to bother with it). I was looking at a bi-fuel pickup for sale, and it had precisely that. When it was running on natural gas it ran off of a throttle body unit, and when it ran on gasoline it used TPI, and it all went through the same intake manifold. Well, that's all I have for now.:Smarty: Any questions? - Freed
