Welcome to the all new Geo Metro Forum. We hope you enjoy your visit.You're currently viewing our forum as a guest. This means you are limited to certain areas of the board and there are features you can't use and images you can't see. Registration is simple, fast, and completely free. If you're already a member please log in to your account to access all of our features: Join our community! |
| Tofuball's '94 XFi; It's all about city MPG | |
|---|---|
| Tweet Topic Started: Mar 12 2011, 08:59 AM (39,414 Views) | |
| Tofuball | Mar 23 2012, 02:38 PM Post #526 |
|
Strange Mechanic
![]()
|
Geo Glenn is my hero.
|
![]() |
|
| Coche Blanco | Mar 23 2012, 02:40 PM Post #527 |
|
Troll Certified
![]()
|
Take another pic showing the difference better, thanks. (it'll help in future threads) |
![]() |
|
| todaugen | Mar 23 2012, 04:51 PM Post #528 |
![]()
|
Hey hey hey there...he belongs to all of us
|
![]() |
|
| t3ragtop | Mar 24 2012, 05:30 PM Post #529 |
|
Turbo3 and Twincam Tweaker
![]()
|
the other way to go for the 30mm cam gear is to use one from a g13b dohc 16v (swift gt engine.) those have the 2 alignment slots on the center like the thin one in your pic. |
![]() |
|
| Tofuball | Mar 25 2012, 05:07 PM Post #530 |
|
Strange Mechanic
![]()
|
Getting there... Ground off two teeth on the dizzy and going to use that as the cam reset sensor for now.
|
![]() |
|
| starscream5000 | Mar 26 2012, 06:48 PM Post #531 |
|
Got 70 MPG?
![]()
|
Nice choice for the oil filter
|
![]() |
|
| Tofuball | Mar 27 2012, 06:39 AM Post #532 |
|
Strange Mechanic
![]()
|
Heh, thanks. It's not the final setup, gonna run it like that for a bit but I have a remote mount kit and an oil cooler I'm going to hook up. |
![]() |
|
| Tofuball | Apr 1 2012, 03:46 PM Post #533 |
|
Strange Mechanic
![]()
|
Pulled the XFi harness . . .![]() Unwrapped it . . . ![]() Here is a picture that illustrates the old style of BATCH injection . . . these are the three injector plugs from the turbo model, they all run off the same two wires, they all fire at once. ![]() Edited by Tofuball, Apr 1 2012, 03:47 PM.
|
![]() |
|
| Coche Blanco | Apr 1 2012, 04:00 PM Post #534 |
|
Troll Certified
![]()
|
How does that work? (batch fire) |
![]() |
|
| Tofuball | Apr 2 2012, 05:46 AM Post #535 |
|
Strange Mechanic
![]()
|
What part don't you understand? I'll try and explain, I'm actually halfway out the door on my way to work so I'll try and make this quick. It is very similar to our TBI (Throttle Body Injection)- I believe our TBI fires three times per cam rotation - the batch system may or may not do the same, however batch is much easier for a manufacturer to design, it only requires one injector driver channel, and no additional timing equipment on the engine or ECU (Engine Control Unit) besides the distributor. The factory batch injectors have two "nozzles" in the pintle cap that spray on either side of the hot valve, like a hose. This helps the older style injectors get a smaller droplet size, better fuel-to throttle response (you can run leaner, smoother) and less fuel stuck to the walls of the intake manifold then a TBI. To do timed sequential injection (the setup I am doing), the ECU has to know engine position with a much greater degree of accuracy. That is why I am using that toothed wheel (32 teeth, minus 2, minus 2, minus 2) for my crankshaft sprocket - it lets the ECU know where the pistons are. On top of that, I have a cam position sensor, made by cutting all but one tooth off the distributor. That cam position sensor, combined with the crank position sensor, allows the ECU to know engine position and speed well enough to be able to fire the injectors at the ideal time for whatever I am tuning for (power, economy, emissions, usually injector timing is used to tune for emissions or economy rather then power). The results? Theoretically, smaller droplet size, even better fuel-to-throttle response, even less fuel stuck to walls, and (to some degree) intake charge shaping (choosing where in the piston charge the fuel concentration is) And now I'm late for work. Bye! |
![]() |
|
| Tofuball | Apr 3 2012, 01:58 PM Post #536 |
|
Strange Mechanic
![]()
|
Changed the front wheel bearings, wrote up a how-to if anyone wants to know how to change the 94 and earlier style bearings. http://geometroforum.com/topic/4749908/1/ |
![]() |
|
| Tofuball | Apr 3 2012, 05:24 PM Post #537 |
|
Strange Mechanic
![]()
|
![]() Starting to look like it belongs in a car . . . |
![]() |
|
| wanderling | Apr 3 2012, 08:19 PM Post #538 |
![]()
|
What is the difference between an XFI engine and the engine in a regular metro, if any? |
![]() |
|
| Scoobs | Apr 3 2012, 08:23 PM Post #539 |
|
:D
![]()
|
Camshaft and timing gear. |
![]() |
|
| Coche Blanco | Apr 3 2012, 08:35 PM Post #540 |
|
Troll Certified
![]()
|
Camshaft and pistons. ECU is too, if you count that. |
![]() |
|
| 1 user reading this topic (1 Guest and 0 Anonymous) | |
| Go to Next Page | |
| « Previous Topic · Project Forum · Next Topic » |


Welcome to the all new Geo Metro Forum. We hope you enjoy your visit.









7:24 PM Jul 10