Electronics for the Redline

[Sp00ner]

What is available for us to tune the car electronically?

Psi-Fi/Rev-It-Up kit...
Intense setup
MAF-T setup

what else?

[Twincharged]

Granatelli MAF-A-Matic
SMT6
Split Second has some frequency tuners
but the SMT6 setup right is by far the best option. It does it all Analog 0-5v, Frequency, external fuel injection driver, and external component switching.

[ptparker]

Originally Posted by Sp00ner

What is available for us to tune the car electronically?

Psi-Fi/Rev-It-Up kit...
Intense setup
MAF-T setup

what else?

I believe that the intense one is the MAF-T

Also ZZPerformance sells the Mini-AFC 2

[Sp00ner]

Ok, so what can't we do, tuning-wise, with these options? What are we limited in? Or is it just in our heads?

[rice eater]

we can't play with the rev limiter, or air fuel as far as I can tell. Please someone tell me I am wrong.

[Sp00ner]

It would seem that we have a few way to adjust the A/F ratios... maybe not the best way to do it, but it's quite possible, just from what I'm seeing.

Redline is an issue though... if you're saying the springs are a bit weak, then I don't think bumping it up would be a good idea...

[ptparker]

Originally Posted by Sp00ner

Ok, so what can't we do, tuning-wise, with these options? What are we limited in? Or is it just in our heads?

With the exception of the SMT-6, All of these attempt to "tune" the car by manipulating the MAF sensor reading.

Twin, feel free to chime in too..

Tuning the car (in the context that you are talking about) is simply put controlling the ignition timing and amount of fuel going into the engine.

MAF-T's (and everything in this family) does this by 'fooling' the cars into thinking there is a different amount (more or less) air going into the engine, theirby allowing the ECU to control the different amounts of fuel. When the car goes into closed loop another problem is that the car will adjust the fuel based on the O2 sensor value also. The problem with our car comes from two places:
1) using a MAF-T is not very effictive in adjusting the timing of the car. The car also uses the MAP (pressure), IAT1 (ambiant air temp), and IAT2 (charged air temp), and knock sensor readings to base its timing advance.
2) using a MAF-T is only so effective in adjusting the fuel going into the engine. There is an algorithm that uses the Throttle Position (TPS), MAP, and MAF sensor to makes sure there isn't a fault in any of the three sensors. If the disparity between these gets too high because of you manipulating the MAF sensor but not changing the other one it will go limp on you (that sounds wrong ; P0068, i think).

The solution to this is not black and white. To gain some control of your timing, you can manipulate your IAT's or even your coolent temp. This seems to have a large effect on timing. Also the car tends to pull back your timing at higher boosts so, you can 'clamp' you MAP sensor.

[rice eater]

I am working with sinister on new Ti ones. we will be ok there. it's just the cost that is a bummer.
valve springs and retainers that is.

[ptparker]

Originally Posted by rice eater

we can't play with the rev limiter, or air fuel as far as I can tell. Please someone tell me I am wrong.

The rev limiter is tricky to mess with, but nothing is impossible. I don't know for a fact, but i think our cam/spring design is why we are limited to 6500. I think the lower end is strong enough to take us at least 1k if not more past that.

What do you mean by "air fuel"? Every one of these MAF-T's, SMT-6, Apex-i things manipulate the "air" side of air fuel. The smt-6 also allows you to manipulate the "fuel" side of the equation too, by controlling injectors independently.

[Sp00ner]

So all of these, other than the SMT, are just messing with the car's MAF reading, thereby fooling it into thinking needs more or less gas. So, you tell the car that it's reading more air than it is, and the car injects more fuel to adjust everything correctly. Got it.

Now the SMT, that's doing the same thing, but it's operating on a couple of different sensor values all at once, instead of just the MAF signal. Right?

The issues come in, once the car knows that something is outside of tolerance, by running it's misc 'rationality' checks, correct?