fuel managment

[RAPTORFAN85]

I know about adj. MAP and crank sensors, but is anybody else running anything different?
I have an OBD2 system (2001) so it would have to be compatable with that.
I have heard about APEXI but havn't heard of anyone runnung it on an OBD2 system.
What are some others to look into? A good controller or even a complete fuel managment system is somthing I don't mind spending some coin on.
I know that there has to be somthing that will work on my jeep!

thanks
jake

[SilverXJ]

I have the Apexi and it is like an adjustable map sensor, but you can adjust different RPM points and at that throttle % it kicks the adjustment in at (both low and hi). There is also the PSC1 which can you can read about on "Help me stroke my 4.0!" thread. I have the Apexi SAFCII on my on my 2000 XJ.

[TurboTom]

I am running a Megasquirt Fuel injection on my 4.0 Turbo setup.
Great stuff ..great price

[SilverXJ]

Your mega squirt is just controlling the fuel injection, not spark?

[TurboTom]

My setup controls the spark also. Pluse from my distributor goes to MS-II (MegaSquirt 2) and then the MS-II controls an MSD box.
I have full control over the timing curve based on RPM vs Manifold pressure

[SilverXJ]

What year Jeep is it on? Any problems tuning it?

[TurboTom]

The engine is a 2000. It is in a 1979 AMC Spirit drag car that I am building. (look in the AMC section here)
As far as tuning, I have a wide band lambda that will let it "kinda " tune itself. I have used quite a few systems in the past and must say the software is pretty good.
I should be getting it on the dyno next month and will tell you more after that.
For what it's worth, I did assemble mine from the kit and the engine started on the base map and revs quite well.
There is a guy in FL that has a MS-II on a 4.0 and says it drives as well as the stock system.
I would always go with a stand alone fuel system on a modified engine, just because you are not limited on what you can do.
It is a big learning curve if you have never done anything like this before. Not impossible...just big.
The Megasquirt forum is a great thing.

[SilverXJ]

I had thought about going with MS, but I decided against it for several reasons. 1) have a 2000 XJ, which uses a twisted pair wire for the gauges. I.e. the gauges are run over two wires.. maybe more, but there isn't a separate wire for each gauge. That also means the stock computer feeds the gauges their data. I know I could go with complete after market gauges, but thats kind of pricey. 2) I don't know where I will be living in teh future and some places hook up to the OBD II port to run checks. MS= No OBD. 3) Its my dd. While MS can be used on a DD I haven't used one before and I wouldn't want to start on my dd. Now.. when I get my Jag V12 running I'll probably convert to EFI and run MS.