Engine managment? How's about this --

[8Complex]

I've been researching trying to find a good solution for engine management and I believe I've finally found something that'll work. This unit is basically an S-AFC and an ITC built into one, but programmable by laptop. I believe the company calls it the FTC, and I'm quite sure you've heard of them before : Split Second.

The unit alters both fuel and timing, and comes with a built in 2.5 bar MAP sensor. It alters MAP voltage to regulate fuel, and alters the crank position to regulate timing. The MAP sensor voltage can be altered up to 2.5v, and the timing can be retarded up to 20°.

I haven't had the chance to play with this unit yet, though I do have one on order which I will be canceling soon (I need something more expandable if I want to go over the 350hp mark). I would just hate to cancel before anyone else had the chance to talk them into making them for our cars for sure as they're currently only making them for Dodge Dakotas (of all things *shrug*).

Now theoretically, you could drop 440-550cc injectors into the car, pop this unit in with it's 2.5bar MAP sensor, and your fueling would be nearly right on. Timing would need a bit of tweaking (retarding), but thats pretty self-explanitory if you're watching the EGT's and A/F gauge. Make sure the A/F is right and EGT's are decent and you're good to go. Like I said above, timing can be adjusted from 0° up to 20° of retarding, so this will leave much room for adjustment in most AFI applications.

There is even a unit for you guys with pre-MY00 vehicles with narrow-band front O2 sensor that can force your ECU into open-loop mode early - making the tuning process that much easier.

I was going to run this unit with larger injectors and call it a day, but I've decided I want more expandability due to future plans. If you're interested in the unit, please feel free to contact Split Second about it -- oh and one of the best parts? It's only $529! Thats pretty cheap for a unit that'll rival the Unichip, but let you program it yourself.

www.splitsec.com
(949) 863-1359

* Registered users of the site do not see these ads.

[Graham]

Only make them for the Dodge trucks? Whats that about?


If this unit needs to be wired in, and I assume it would, couldn't we just find which wires we need and call it a day?

Sounds like a pretty cool device, any chance you know how many maps can be programmed in and the timing/AF plots?


Graham

[8Complex]

I think someone there owns one of the trucks, hence it just being made for them at the moment. I had talked to them about it being configured for the Subarus and he said there shouldn't be trouble, he just had to do a bit of research (which was supposed to be done sometime near the end of this week). I think he mainly had to find the wiring and call it a day, which isn't much trouble to those of us with access to ECU pinouts (just about everyone ).

It uses a newer version of the same software that the PSC-1 (programmable MAP sensor unit) used, so IIRC it can be programmed for every 500RPM and 1.5psi increments - might be .5 psi increments, I don't recall exactly.

Forgot to mention, I really see a version of this unit without the built in MAP sensor being great for the WRX guys, but I just don't see them accepting such a "hack" method of tuning (even though the Unichip adjusts the same, though not with the same methods).

[RageHardIntoTheBendies]

Very interesting Thanks for posting that.

[kastle]

Shoot a email over to Robert @ Forced Air Tech... I'm pretty sure that he is now using the SS TMC with his kits... he might be able to get it cheaper and/or help you with it.

[RageHardIntoTheBendies]

Do you know what Kind of temperature sensor that unit uses?

it get's down to -40c here and I wondering how that would effect a unit like this?

[8Complex]

It doesn't use a temp. sensor as it is a piggyback unit. The stock ECU will enrich the mixture automatically when it senses the cold coolant and intake air temp. It just alters signals, so you could bring it down to the point where you have it running perfectly the same off-boost as it does stock.

Hell, this could even be used to tune NA applications, just take the 2.5bar MAP sensor out of the system and use the stock MAP or MAF sensor.

[RageHardIntoTheBendies]

Does the Ecu not need the air temperature to figure out how much air there actually is based on the pressure though?
The HKS VPC has it's own dedicated sensor for that purpose.
I'm guessing the unit is just intended to provide enrichment, based on boost and is not suitible to completely replace the MAF.

Still I'm sure you could use a more robust MAF, and still tune it fine.

[8Complex]

Ahhhh, MAF. Well, I'm not entirely positive you can replace the stock MAF, but I am sure you can alter it's signal. Does the voltage range of the stock MAF's run over the 3-5psi level where fuel cut occours? If so, you could just tune down the voltage still and use larger injectors to get more fuel.

With this unit, you could actually plug in a different MAF, tune it's voltage, and then also control timing. So I guess you could replace the MAF with another, you'd just be using this to correct the voltage of it's output for the ECU. (voice=cheesy announcer)As an added bonus(/voice) you could control timing on top of that.

Has anyone looked into swapping the WRX MAF into the same location as the stock MY98-99 MAF? That should work ok, and you could then alter the signal for your purposes & injector sizing.

[WRXpkr]

So,
{quote}
I really see a version of this unit without the built in MAP sensor being great for the WRX guys, but I just don't see them accepting such a "hack" method of tuning {QUOTE}
what exatly do you mean? i was thinking of going with the 500$ hks dealy...
the last post there you seem to be thinking it might work better for the WRX as it is?
Signed:
Interested and Confused

Just did a quick search and found this... it kinda pertains to the other ecu thread, but that ones long enough... lol
http://www.ecutecparts.com/sys-tmpl/product/

[8Complex]

Trent - Not saying that it won't work well, or as well, just saying that it's looked more like a hack to a lot of the WRX'ers. I've gotten that response on a lot of common things that us RS-T's and other FI other cars have used to get the job done. *shrug*

Either way, it'll work the same, it'll just not control boost like the Unichip, and may be a bit more involved to tweak, though I'm not sure exactly how the Unichip changes the output values from the ECU. Does it change the input signals, or the output signals? No idea, but if it changes input signals to change the output signals, it's doing the exact same thing.

[Darshu]

Ahhhh, MAF. Well, I'm not entirely positive you can replace the stock MAF, but I am sure you can alter it's signal. Does the voltage range of the stock MAF's run over the 3-5psi level where fuel cut occours? If so, you could just tune down the voltage still and use larger injectors to get more fuel.

8- What were you talking about when you mentioned the 3-5psi fuel cut on a MAF-equipped Impreza? I wasn't aware there was one. I know it'll throw a CEL for positive manifold pressure, but I hadn't heard of this before.

[8Complex]

I thought that the MY98-99's had fuel cut when they ran up above 4-5psi on the stock MAF's. Perhaps I remember wrong? I've never turbo'd or worked on a turbo pre-MY00 MAF-based scoob other then an old Legacy turbo.

Actually, looking how the quote you posted above was stated, I'd like to change that to : "Ahhhh, MAF. Well, I don't think you can replace the stock MAF with a MAP sensor, but I am sure you can alter it's signal."

This is probably a good alternative to those who are going turbo with MY98-99's and are worried about their MAF's yet don't want to go complete standalone. Drop in injectors, plug in another vehicle's MAF, and tweak to your heart's content.

[Darshu]

8- Ah ok, I just wanted to be sure I was reading you right. For the record, MAF-equipped 98-99 RSes don't have a fuel cut based on MAP, though they do have a MAP sensor that does god only knows what (someone can tell me, I'm sure) and will throw a CEL if you hit boost (easy mod to keep it from seeing boost -- two one way check valves and some vacuum line)

Also, it's the MY99 RSes that have a problematic hot film MAF design. The MY98 RS uses a hot wire MAF that doesn't have the same durability issues.

Just wanting to make sure we're working off the same page

[8Complex]

Darshu - Good info. I didn't know that it didn't throw code based upon airflow, but upon manifold pressure. I had thought that it was strictly a MAF-based system, but I guess Subaru has the MAP in there to check it like the older Legacy turbo's. I used a potentiometer on my friend's turbo Legacy to raise the fuel cut, worked like a charm and didn't effect the a/f ratio either.

[RageHardIntoTheBendies]

The MY99 EJ25 does not have a MAP sensor, the EJ20 has both.
The MY98 may have one as part of the EGR system?

As far as I know the only problem with running Positive manifold pressure on a MY is the crank case breather.
SCC Ran just fine with no CE's.