In researching a propane conversion for my delivery truck I came accross a system that could be used with just about any fuel. It uses a tps, map, tach and o2 inputs. It made me wonder does anyone else make a custom fuel injection fo the hotrod crowd. I figured someone here might know.

I was thinking of building a liquid propane injection for my 1980 bbc truck project with this system too.

Let me know what you guys think.

John

I did not built my system from scratch, but I am running a DIY controller with injector and MAP upgrades on my turbo engine. The one problem I can see with the propane injection is the amount of pressure required to keep it at a liquid. Seems to me that plumbing would be a nightmare. I can tell you most anything about the controller and hardware side of the installation, but the propane you are on your own. Let me know what exactly it is you want to know and what system you are looking at. There are many different controllers from Do It Yourself(DIY) to oem type aftermarket stuff. Price and fuction, of course, vary wildly.

Chris

MegaSquirt

http://www.megasquirt.info/index.html

most "bang for the buck" ....

Well, I have to disagree. If you want a capable controller with options available the Genboard V3.1 is 100 time better than the motorola megasquirt. V3 is much nicer than alot of oem controllers and cost very little more than the ms. Here is a link:

www.vems-group.org

Chris

Thanks guys for all the info.

Turbo I would be modeling my system after the Schwanns Ice cream trucks system. They have a pump that recirculates the propane back to the tank. I am not sure at what pressure their system runs at but I am trying to find out. The biggest problem is controlling the pressure, liquid propane is hard to regulate because it is very sensitive to temperature (ie 90*f = 150 psi 70* =115psi). Most under hood temps would put the pressures up into the 250-300 psi range. It is a cool idea (pardon the pun) because the liquid injection makes more power than the gasoline version due to the refrigeration effect. It is easier to use vapor injection, which is probably what I will end up doing.

Being that I am hard headed I will at least have to try and do it. The DIY systems should be able to do what I need them to do. Any info on your system turbo would be greatly appreciated.

Thanks

John

well, im no expert, have´nt even built a MS .. i´ve just read alot
about them , and they seem good .. =)

i´m definetly gone look into your suggestion ....
its cool that their website is a wiki!

thanks for the tip!

Iam building a tow rig for my drag car and it has a 2nd gen ecu thats made by holley instead of msd.its a manual control open loop unit,but I have a closed loope kit to instal later..now this is my problem, I just bought a blower from ebay and the holley techs say I cant run my 900cfm pro-jection tbi because it does not have a map sensor"manifold absolute pressure sensor" or a maf "mass air flow sensor" can I add one or both and splice into"add on" to the system,I understand the ecu needs to know when the boost kicks in to richen the injectors .is their a kit or were can I be pointed to to find this info?thank you for your time...Jake

Sounds like you have a pretty good handle on it. I think it will be a cool project and with a turbo would be really cool because of the air charge cooling. Anything you want to know on my setup I can go through. Just let me know what you want to know.

Chris

I think I read some info on those thoughts and there was a lot of concern about the injectors freezing with the pressure drop and small orfice.

I am doing a very similiar thing with my Turbo Engine except using an edlebrock system. The main thing that is that the ECU has to be able to be tuned to work with a 2-3BAR MAP sensor depending on boost level. It sounds like the ECU you have is setup for alphaN control which is about the worst way to control EFI. Fuel is controlled by RPM and throttle position only.....which is piss poor. My ECU did speed density(MAP and MAT), but would not handle 2BAR without reprogramming. I decided, and I think you will also, that a new ECU is the best choice. I went with the Genboard and it is running very well.

Chris

I've built 2 Megasquirts. They take a while to assemble, but are quite easy to do if you can solder and are very careful

The AVR - VEMS was based on megasquirt, actually they priated the code. Initial version contained reference to MS authors code but then they decided to turn.

True that the original code was just C based ms code. I am not sure what you are trying to say by "turn", but what happened is that the VEMS group began to develp much more robust and tunable code along with adding about five times the features of the MS. Most of the MS crowd talks crap about VEMS becuase they are jealous of the fact that the fairytale UMS is not close to being finished and the Genboard V3 is already finish, running engines, and more powerful than the planned UMS.

Chris

Yeah it's cool it's a wiki but they are still converting over apparently, as it stands I was unable to find the price/avail info on it. Seems like it might be kind of important LOL!
When you click on [online order-page] it just re-loads the same page.

I'm also *looking into* a DIY FI for the Mustang Re-Build project so this is of great interest to me.

Any suggestions/recommendations as to what injectors to use? How about pumps, do you HAVE to use an "in-tank" pump? (doesn't seem so to me but what do I know.

meanroy,

Here is a link to the VEMS web shop. There have been some problems keeping it online, but if you try a couple of times it should load: http://shop.x-dsl.hu/catalog/index.php?cPath=1. The site is certainly under construction and we are working to try to start a good manual for newbies. As it is now, there is some pain involved when you first get started, but any DIY project is that way. I will be the first to say it is more difficult than megasquirt, but with the added features it is a must. There is also tuning software under development to try to make everything easier.

Pricing is $178 euros for an assembled board with minimal final assembly of tall components and input fuse and filtering required. You can then get the case and plugs separate or source a different type if you like.

As for the pump, you need a high pressure pump with return line to the tank. Injectors just have to be sized for HP output.

Glassratt,

I dont think that splicing into the existing system will work too well unless there is an ECU upgrade so that your ECU will be tunable under boost. You will just have to talk to Holley about that. I found that Edelbrock's system is not upgradable so that is why I went DIY.
Chris