LS-1 MAF translator vs ARC-2/ VPC

[Kevin Jewer]

Yeah, I've been on that list for years. But I wouldnt want the complexity of combining the two to get adequate fuel delivery. I think its far better to go with bigger injectors and push off fuel cut the usual way (aside from TMO or dSMlink). But if you already have a WI system in place, its not to hard to change the mixture and/or change nozzles.

 

[natedogg]

We didn't install the WI system to delay fuel cut. We did it to cool the intake charge and increase the octane to allow higher boost pressures w/o detonation. I think its a fairly easy setup with the translator...just grab the purple wire and tap the line that energizes our solenoid when the WI system is active. Then adjust the aux knob on the translator to run a little richer when the purple wire is energized.

 

[cazual]

Ok... for the guys that already have the translator can we get some more reviews. Any dyno runs, how is the idle, etc. Thanks

 

[Ramchargers]

Lets talk about the fuel cut thing a bit. This is a very simple version of what happens and not exactly 100% perfect (no flames please) but it IS accurate for the purpose of this discussion and the usefullness of the dreaded FC switch. No matter what your skill level you should get this. Remember I said simple version. If you exceed a set number (that relates to airflow) in the PCM it says to itself (recognizing the voice right away): "in the course of normal operation I should never see this much air, I might hurt myself, I need to turn off the injectors before I break some parts" this = fuel cut. When you put a bigger injector in the car and use an AFC to reduce the delivered fuel you also reduce that number and do not approach fuel cut. You need to reduce fuel because the computer does not know that you have bigger injectors and decides that for this much air I need this much fuel and since my injectors are this big I need to turn them on this long. (reread that) So now my "big" injectors are too big, an AFC fixes that. If we turn up the boost even more, we again hit fuel cut though. With a translator we can stop from sending this info to the computer ever so we never see fuel cut. The down side is that we can now run out of fuel because the ECU doesn't add any more. We can add more boost but we get no more fuel, eventually we will break something. Enter the WOT control. If you need more fuel at wot you can add it there. A couple problems, you could run out if injector on time (pulsewidth) or you might have too much boost for the adjustment. YOU NEED A SCAN TOOL. Turn up the boost slowly with the fuel cut switch OFF, Watch the O2 or EGT until you get it right using the adjustmments on the MAFT. If you hit fuel cut turn the fuel cut switch on and add fuel with the WOT retune with your scan tool add boost till you run out of fuel or break some parts. </SARCASM> At this point we once again need to look at bigger injectors except we now do not need an AFC since the MAFT has those adjustments in it. Hope this helps, if you understand good, if you don't please get with me privatly.
[email protected]
888 293 7267 (toll free)
Mike Licht

 

[natedogg]

Mike that was a good explanation and I understood it completely. I have another question related to it. I like my fuel cut enabled for street tuning, because, if and when I f**k up in the tuning department, the fuel cut algorithm keeps me from destroying my car. Now when I put bigger injectors in and adjust the base setting on the translator accordingly, is this, in effect, delaying the point at which I will hit fuel cut assuming I still have the fuel cut dip switch off (aka fuel cut still enabled). In other words, does the base setting on the translator work the same as compensation throughout the RPM band on an SAFC assuming larger injectors?

Also, just out of curiosity, does the dip switch limit the frequency that the ECU sees taking into account the fixed air temp and pressure values, therfore disabling fuel cut? Or does it simply limit the voltage that the translator sees from the GM MAS?

Thank you for your time.

 

[Kevin Jewer]

How is it possible that the translator can increase fuel with the WOT knob without increasing the airflow signal (getting closer to fuel cut) You would have to be affecting IDC some other way for this to work.

 

[natedogg]

Originally posted by 95GSXracer
How is it possible that the translator can increase fuel with the WOT knob without increasing the airflow signal (getting closer to fuel cut) You would have to be affecting IDC some other way for this to work.

I believe that's where the base setting comes in. Larger injectors increase the amount of fuel one receives every pulse. Setting the translators base setting for larger injectors lets the ECU see less frequency per amount of air flow because the ECU itself still thinks your running the stockers, but your getting the extra fuel from the larger injectors themselves. Now adjusting the WOT knob allows the ECU to see more frequency per air flow to give extra richness to your mixture. The way I see it, dampening the frequency measurement to the ECU throughout the RPM band (aka base setting) in conjunction with larger injectors allows for a larger range of tuning at WOT.

That's not to say you can't still hit fuel cut or the frequency limit induced by the dip switch (which, from what I gather, will cause you to run lean) if your flowing massive amounts of air. If this is the case, its time for even larger injectors, or pulling back the WOT adjustment and adding extra fuel pressure with an AFPR.

All this is based on my assumptions. Let me know of any obvious flaws in my judgement. I'm not a mechanical engineer.

 

[dsmturboawd]

well, i am the first to have problems with this thing. i got a check engine to day and we traced it back to the mas.

oh well.

 

[BobTurbo]

Give us some details, and we will surely straighten out the problem.

Switch settings
LED activity
troubleshooting results

Bob

 

[Ramchargers]

Let us know what is up so we can figure it out quickly for you.
Mike

 

[spitfire]

Ok, everything sounds great with the translator and all but the only thing that has me wondering is will the maf itself hold boost pressure when used in a blow through setup? It just seems to me that boost will leak from between the maf core and the ends. Im sure I can seal the maf with some rtv or something similar but will this effect the maf's operation? I've checked the other foums but cant find an answer.
Im just trying to decide which setup to use (blow through/draw through), and this will be the deciding factor.
thanks

 

[DSMraver]

Spitfire, please read the entire thread before asking a question.

This question has already been addressed, yes the GM MAF will hold boost.

 

[spitfire]

dsmraver
Ive been reading forum threads on this topic since there it was a dual mas discussion. I never saw a post about it holding boost, sorry i must have missed it. (in the many forums and tons af pages i looked).
Oh, by the way have you seen it hold boost?
Or just heard it will?
yes, im serious
thanks

 

[Ramchargers]

I have seen it hold boost, yes it will, I have posted this a least twice. Sorry you did not see it.
Mike Licht

 

[spitfire]

translator being ordered as we speak.
thanks mike

 

[Vince]

Can the ends of the MAS be beaded safely by a welder or is there
some other way of keeping the pipes from blowing off in a blow thru
application?

 

[DrZiplok]

The ends of the GM MAF are already beaded to a degree; I'd expect that with a decent clamp they will hold a hose at 30psi without too much trouble.

You could remove the ends and bead them with an Aluminium welder, or machine the retaining groove deeper if you experienced problems.

 

[Tallen]

wheres the CAS/CAS wires on a 2G? or could i just tap pin #58 on the ECU for an RPM signal?

theres only 2 wires on a 2g CAS righto???
one is black and the other is black with a stripe?

 

[BobTurbo]

The ECU RPM signal is fine.

 

[Motohead1]

Ok Mike or Bob have ya found out why the green led is still dimmly lit with my aplication? Its working as advertised no problem but just wondering why it is? BTW my setup is 14b ported 3"exhaust 550s stock pump AFPR at 34psi running a 3"mas and all 4 switches in the off position. At idle the green led is dimmly lit? but everything is working fine infact I can rev it hard enough in nutral to make the green led light go full bright and make the red WOT light flash. Also its a 90 cas rpm tapped on the white wire.

 

[Tallen]

moto...mine does the same
lets see what they say. mine works as said too....and i know the idle settings are right too becuase i can adjsut idle and mid and see a diference. maybe its a bug in the box? i went as far as tapping the ECU rpm signal!

oh yea i triple checked all wiring.

 

[Pfunk47]

Is there any progress on the UICP for a Blow through design that Dejon Tool said they were going to do, or somebody said they where going to do it. If so, when will it be ready?? and what IC's will it fit ??

 

[Ramchargers]

Originally posted by Motohead1
Ok Mike or Bob have ya found out why the green led is still dimmly lit with my aplication? Its working as advertised no problem but just wondering why it is? BTW my setup is 14b ported 3"exhaust 550s stock pump AFPR at 34psi running a 3"mas and all 4 switches in the off position. At idle the green led is dimmly lit? but everything is working fine infact I can rev it hard enough in nutral to make the green led light go full bright and make the red WOT light flash. Also its a 90 cas rpm tapped on the white wire.

WHO SAID BUG!? Ding, ding, you win. We discovered a software bug in the softeare that controls the operation of the LED sometimes. It in no way affects the operation of the unit just the light. We will offer a fix at no charge to anyone who wants it once we create one ( the easy fix is to just change the instructions )
Mike Licht

 

[eclipse2via]

Originally posted by Pfunk47
Is there any progress on the UICP for a Blow through design that Dejon Tool said they were going to do, or somebody said they where going to do it. If so, when will it be ready?? and what IC's will it fit ??

How about asking Dave and getting back to us?

 

[eclipse2via]

Mike what is the latest info on shipping units?