Greddy, Apexi, or Megasquirt

[Brown-Boy]

So I've used the search button and looked through the other forums and I need a little more information about which engine management would be the best thing for a certain application. As of right now I'm rebuilding my BP engine, everything is apart, head and block. I'm going to add on the turbo when the engine is put back together. I going to put on a vj-11 turbo still unsure what size injectors I need to use. Nothing is going to be done to internals of the engine so everything is pretty much stock minus the turbo. What engine management would be best for this type of application? It will just be a daily driver and taken to the track a few times.

[mooseheadc]

Re: Greddy, Apexi, or Megasquirt

I'm going to add on the turbo when the engine is put back together. I going to put on a vj-11 turbo still unsure what size injectors I need to use.

Don't use Stock, too small. Around a 34 lbs Injector is a good start,
but I use the '5th Injector' mod and adjustable Fuel pressure
regulator. This bypasses the stock ECU and lets you use
smaller injectors that allow a better idle, yet not burn pistons
at speed.
I went with a SOHC block with DOHC head to get lower
compression which is more friendly to slightly larger turbos(T25),
so keep this in mind

You are going to add a BOV, right?

What engine management would be best for this type of application? It will just be a daily driver and taken to the track a few times.

For what you are doing, the S-AFC should be OK.

Megasquirt is overkill, unless you plan running a bigger
turbo in the future, or feel like adding goodies like knock sensors
and such later on, and spending a lot of time tweaking that software
to get the last bit of safe HP out of that motor

[Brown-Boy]

Ok so you bring up some good points. What vehicles would these injectors come off of? Is there a list of vehicle with injectors that will work with no modification?
Yes I am using a BOV.
I was leaning toward the S-AFC but I've read that it will mess your timing up on the vehicle because it only controls fuel. Is there something else I need to worry about investing in if I go that route?

[mooseheadc]

Ok so you bring up some good points. What vehicles would these injectors come off of? Is there a list of vehicle with injectors that will work with no modification?

I've not seen a list of interchange. Densos should drop in without
trouble from other asian imports, just match impedance(or add resistors)
if needed, but IIRC ones from Supras are a drop in.

I went with ones from a Mustang, but I replaced connectors and had
to mess around with ORings to stop leaks. But the lower price
made up for all that.

I was leaning toward the S-AFC but I've read that it will mess your timing up on the vehicle because it only controls fuel. Is there something else I need to worry about investing in if I go that route?

I'm not having a _real_ problem with that yet, but not running exactly
the way I want, for the boost I want to run.

My next step is to bypass the stock ignitor system and tie in a
MSD 6BTM box that allow you to play with retarding the spark.

Now a Megasquirt will do all that, and them some, but will take
a lot more tweak time

Start with the SAFC, and the MSD fuel regulator and slightly
larger injectors, plus have a decent set of AF and EGTemp
gauges so you know whats going on.

That should get you running, and add on other stuff as you feed the need
for squeezing the most out of the motor

[Brown-Boy]

This is easily the best information I have encountered so far. I just need a way to start, then from there I might upgrade. This so far seems like a good start. My only trouble is with tuning and this seems like it's just want I was looking for.

[mooseheadc]

This is easily the best information I have encountered so far. I just need a way to start, then from there I might upgrade. This so far seems like a good start. My only trouble is with tuning and this seems like it's just want I was looking for.

I was planning to do the megasquirt, but got antsy to get the motor
going, and did the 5th injector and other stuff to get it running ASAP
and it ran better than I thought it would, so I keep putting off getting
the MSII.

Just waiting for a MSD BM box to show for cheap at a swapmeet,
or one of their timing units you can add onto a 6A, that I have
an extra of already: but to tell the truth,its running strong enough
that as long as I keep the RPMs low so its stays out of the open loop
(where it runs not as good as I'd like, Timing issues) mode, I'm
happy how it works for the street. I would go for the MSII
if a lot of Racing was in my future, however, than finding
somebody to custom chip the ECU

You're running a smaller turbo than my setup, but you are running
more compression, watch for lean run/knock till you get stuff tweaked.
My Intercooler is more to help with that, than to add more power.

Like I said, get good gauges, and look at the spark plug color
often at first.

[Brown-Boy]

Has anyone used the BP26 GTX ecu? From my understanding you could use this ecu but you can't use the knock sensor if you have it on a N/A BP. Could you use the GTX ecu and the MSD boost timing controller if you can't use the knock sensor on the ecu?

[Gforcefd]

Well the BPT ecu is 200 bucks for a used one, if you can find it, plus what another 200 for msd boot timing controller? Might as well buy the megasquirt for 300, or buy a emanage ultimate for 500.

[Brown-Boy]

The reason I say the MSD btc is because without a knock sensor how else am I going to deal with timing. Everyone says go with MegaSquirt but I find it hard to believe that everyone has used it on their vehicle or even seen one up close.

[mattswabb]

megasquirt is more than 300 when all said and done. For a complete package already built expect $800+. That's the ecu, relay box, cables, wires and a wide band O2 sensor. You can save by buildiing it yourself, not using the relay box and modifying the existing harness. You also need some other sensors and a tps/throttle body from an auto BP. The manual tps is a switch and the auto is a potentiometer.

Eventually I'll post on how the megasquirt works out. I have everything necessary for the BPT GTX but haven't been motivated to install it yet. Maybe after the new year.

[Brown-Boy]

It's not as cheap as a lot of people say when you get everything. It does seem VERY labor intensive. Just from all my research I don't doubt it is good but I don't know if I want to put all the time into making MS work on my car. After it is all done I don't know how long I am going to keep the car that's another reason I don't know if I want to invest all the time with MS.

[mooseheadc]

The reason I say the MSD btc is because without a knock sensor how else am I going to deal with timing. Everyone says go with MegaSquirt but I find it hard to believe that everyone has used it on their vehicle or even seen one up close.

Many Ford V8 guys don't use a knock sensor when adding a turbo
or supercharger. You just have to pay more attention, and have good gauges when working on the boost limits

You can melt pistons with a knock sensor, it just take a few more runs
if you have your presets screwed up on too much timing or not enough
gas

I'd like a MS, but I just don't have time to dick with the setup,
while ganging a few MSD boxes to works things can be done
in a weekend, and at a good swapmeet, you can pick up used
MSD units for not much $$, or even Ebay, if you get lucky

[Brown-Boy]

The ecu should be good for fuel. I guess I'll have to make sure I have sufficient cooling, a proper intercooler, good ignition, and always use premium gas. I don't plan on running huge amounts of boost, only what the stock turbo can do.

[yvanlavoie20]

greedy

e-manage ultimate is GREAT and the new software V2 is cool, with autolearn for injectors and sub injectors...easy to use and compatible with mazda ecu. can unlock rev limiter and control injectors up to 50% bigger. you can add up to 8 injectors for boost duty and control the mazda ignition ( add or remove timing )

yvan