Wanted info on fuel maps etc...

[Stealer Of Souls]

Hey.
Anyone know some good sources for info on fuel maps, MAP vs MAF, open loop/closed loop, etc...

Just trying to wrap my head around how an ecu controls fuel (and ignition).

More particularly to do with forced induction engines at part throttle vs WOT.

Thanks.

[JamesM]

PW = REQ_FUEL * VE(kpa,rpm) * MAP * E + accel + Injector_open_time


.......

have a read

http://www.megasquirt.info/v22manual/mtune.htm#theory

read that 5 times.. then once more.. then wire up install ecu then re read the instructions on how it controls things again 5 times when u $&#$% up.

applicable to map based..

[Stealer Of Souls]

Thanks James.

So far what's your opinion on the MS?
Are you using squirt or squirt and spark?
I was thinking of using squirt and spark when I finally come to do a turbo conversion.

[JamesM]

i personally think its great..
its very user friendly. there is quite a bit of support on line.
but its reaslly a thing u have to undertake urself or give to someone else that has done MS before.. me or karl or i think there is one or two others in auckland. i originally built my v2.2 board and used 2tg ignition. back then i wired everything up myself, built the board myself, but i didnt understand exactly how the programming/mapping worked etc.. so i got karl to get the car started and then from there i spent many hours playing around on my laptop connected to the car changing values and finding out what everything diid etc.. i then changed to programmable crank angle based timing using a toothed wheel i welded onto crank pulley... i eventually got the map tuned well and the car was runnign awesome on 18-20psi..
have worked on matt sternes ms quite a bit too
i now have v3 MS2 but i just have a billion things to do on the car and havent got the car running again.

u have a few options with ignnition and as time goes on ppl are developing ways to better control stock ignitors etc. (karl is working on using redtop dizzy/ignitor with MS2 i bleieve)
the whoel thign is a lot of work tho espeically if u dont have any experience with it, so expect to have the car off the road for a couple of weeks at least (if u work hard on it)..

but it is alot of fun learnign about it and great value for money.

[Stealer Of Souls]

I suspected as much. I don't mind having the car off the road. I want to build the engine complete before swapping it into the car and taking out the old donk. So I suspect that it'll be off the road for at least a few weeks anyways..,.
Hopefully when I come to do it I'll have plenty of time to just work on the car.
I'm keen to do everything myself as I wanna know how it all works and goes together. Based upon what's currently available I'd be looking at the V3 MS2. Probably spend the extra $$$ and go for some sort of aftermarket ignition system (MSD perhaps?) to integrate into the MS.

I reckon it'll be good. And hopefully I'll be able to tailor some of the programming anyways (I hate machine code, but I can do it).

I might have to hit you up for info when the time comes. It's a while away yet for me. So many other things I have to do. Realistically at the earliest I probably won't have an engine for the car before this time next year, and that's only if everything goes smoothly over the next 12 months.

[JamesM]

by then i would say that the ignition control will be far better.
as for makign ur own code. i dont really see the point.

[Stealer Of Souls]

Yeah. They'll probably be upto something like version 5 by then!

I suspect that the ignition will get better. I was thinking that I'd go for distributorless ignition, and (from the few things I'd read about the MS)just assumed that it would be easier to get something to provide an complete distributorless system and then control it from the MS... It's a bit of an under-reasearched area for me at the moment.

I notice there is a few people who've already done custom code for different things. Didn't know if I'd really need to or not. But if there are improvements to be had...

[JamesM]

yes quite a few ppl workign on code.. but everything i need seems to be covered.. fans etc.. unless ur really interested in the programming of it i would just leave it up to the other ppl/// it will become standard code as tiem goes on anyway.. they r already developing code for launch control (i think its done?).. boost control and a billion other things..
i use edis distributorless system with evo 3 coil packs

[Stealer Of Souls]

How's that work? Okay? Was it hard to incorporate edis?

I'll have to give you a call sometime to have a chat about all this...
See I was thinking
"Is there really any point using second hand gear when I'm trying to build something real nice? Maybe I'll just use something like an MSD ignition system controlled by the MS. That way i get a shiny new 'hi-performance' ignition system, complete with capacitive multi spark thingamejigs..."

It's great how so many people can work on this and make it a totally kick butt product.
Hopefully by the time I get one it'll have launch control, boost control (including the good old "I need to pass that sod" mode), optional analogue output controls for solenoids and stuff like that.

Man.... Wish I could afford the time/money to build the beast now...

Poos blue top for me a little bit longer sadly....