Search found 7 matches

by lapuwali
Thu May 25, 2006 9:52 am
Forum: MicroSquirt General Information
Topic: taking advantage of higher injector pulse width resolution
Replies: 11
Views: 1599

So, having req. fuel set as low as possible will give you the best possible resolution.

In the example above, I'd not set the max table value at only 140, but at 240 or thereabouts (give yourself a bit of extra headroom to go above your current "max"), then set your req. fuel down so 240 gives you ...
by lapuwali
Thu Apr 27, 2006 9:57 am
Forum: Injectors, Fuel & Air Supply
Topic: Using MS to control CIS/K-Jetronic FI systems
Replies: 28
Views: 4727

I love this. Multiple injectors to control the pressure? Why not just move those injectors to the ports and forget the CIS fuel distributor altogether?! CIS is one of the simplest FI systems available, and you guys are dreaming up all kinds of ways to make it very complex. Trying to control the ...
by lapuwali
Tue Apr 25, 2006 1:23 pm
Forum: Injectors, Fuel & Air Supply
Topic: Using MS to control CIS/K-Jetronic FI systems
Replies: 28
Views: 4727

No, L-Jet doesn't do this, either, nor does MS. Even full sequential systems usually don't control fuel to the cylinders individually, they just calculate a value for the whole engine and divide by the number of cylinders (conceptually).

To get per cylinder fuel control, you need to measure each ...
by lapuwali
Mon Apr 03, 2006 12:20 pm
Forum: Injectors, Fuel & Air Supply
Topic: Changing from K-jetronic to MS and throttle bodies.
Replies: 4
Views: 891

No, you won't need it. With CIS, you really only need it if you're not willing to turn on the key and wait a second or two for the fuel pump to build pressure.

There's a shop called Blitz Racing that makes bungs for using EFI injectors in a K-Jet manifold, btw.
by lapuwali
Fri Dec 30, 2005 12:27 pm
Forum: Injectors, Fuel & Air Supply
Topic: Using MS to control CIS/K-Jetronic FI systems
Replies: 28
Views: 4727

I investigated this very problem several years ago. The main problem with controlling the distributor plunger directly is trying to find a servo that would move both fast enough and precisely enough that didn't cost $4000. You can get fast, you can get precise, but both together require lab-grade ...
by lapuwali
Wed Apr 20, 2005 1:15 pm
Forum: Injectors, Fuel & Air Supply
Topic: Mini 3 Port Injection
Replies: 86
Views: 16501

The charge stealing issue is actually quite serious. You're not the first to travel down this path. It is obviously possible, as the MPi engine shows, but it requires some tricks that MS will have a hard time with.

Running rich doesn't fix the problem. You end up with one very rich cylinder and ...
by lapuwali
Tue Apr 12, 2005 1:47 pm
Forum: Injectors, Fuel & Air Supply
Topic: Mini 3 Port Injection
Replies: 86
Views: 16501

What's not being said explicitly but only implied is that you should abandon any hope of "port" injection in your A-series unless you want to do a LOT of development. Throttle body injection works fine. One larger TB will be easier to set up than two smaller ones, as well as cheaper.