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Will Q45 Afm Get Rid Of My Air Flow Cut?

Don Dada

By Don Dada,
in Engines & Forced Induction

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Don Dada Mentor

Don Dada

Posted
Posted

OK guys here's my problem

I tuned my SAFC2 got rid of R&R but still maxing out my afm voltage and getting a cut at about 6200rpm in 5th.

I can't lean it out anymore on top because the ignition is becoming too advanced so my question is can i use the Q45 afm(already got one) and tune this in not allowing ign timing to go too advanced and not allowing it to reach the 5.1V to get this cut? (cuts out for just a sec and then comes back again)

RB25DET

Stock turbo 11psi

Spitfire coils

Safc2

CAI

3"exh

The Mafia Grand Master

The Mafia

Posted
Posted

mine did, just over 6,000rpm on the power fc. I had a picture somewhere of the voltages hitting the ceiling.

I tuned around it though, as i Had a powerfc.

But if yours is maxing out at 6200rpm in 5th, why would you need to bother fixing it? Do you do circut work, or do you like racing on the streets above 230kmph?

SECURITY Grand Master

SECURITY

Posted
Posted

i dont think your Q45 will work because your ecu wont recognise its signal. your SAFC doesnt have the capability to convert the Q45's signal to match the ecu's (i may be mistaken).

looks like you're going to need to upgrade to another EMS or buy an SITC to go with your SAFC to retard timing up top as you adjust your voltages.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
mine did, just over 6,000rpm on the power fc. I had a picture somewhere of the voltages hitting the ceiling.

I tuned around it though, as i Had a powerfc.

But if yours is maxing out at 6200rpm in 5th, why would you need to bother fixing it? Do you do circut work, or do you like racing on the streets above 230kmph?

actually that does raise an interesting question

Why on earth is his tuner... tuning in 5th?

wtf :)

Don Dada Mentor

Don Dada

Posted
  • Author
Posted
mine did, just over 6,000rpm on the power fc. I had a picture somewhere of the voltages hitting the ceiling.

I tuned around it though, as i Had a powerfc.

But if yours is maxing out at 6200rpm in 5th, why would you need to bother fixing it? Do you do circut work, or do you like racing on the streets above 230kmph?

I get it 4th sometimes too when it's colder an when it happens it registers high level of knk on the safc -- 150+ which has me bummin out!!!

So is it possible to get around this with the q45 afm and safc2 combo?

Adriano Grand Master

Adriano

Posted
Posted

The issue is that the output voltage of the safc is hitting 5.1 v so fitting a q45 wont fix it. What afr is it running when it gets to 5v? just before it cuts out. You can certainly pull a couple of deg of base timing to allow furthur leaning of the mixtures which will reduce the chance of hitting the cut.

Don Dada Mentor

Don Dada

Posted
  • Author
Posted
The issue is that the output voltage of the safc is hitting 5.1 v so fitting a q45 wont fix it. What afr is it running when it gets to 5v? just before it cuts out. You can certainly pull a couple of deg of base timing to allow furthur leaning of the mixtures which will reduce the chance of hitting the cut.

Afr's are approx 11:6 and ign timing @ 20* Anything more than 20* and i start to get knk on the safc2

If i pull out a few deg say -3* this now means everywhere in the band will now be decreased by 3* right?

My tuning pts are as follows:

RPM IGN AFR

2400 15* 12.4

2800 14* 12.3

3200 20* 12.1

3600 26* 12.0

4000 24* 12.0

4400 16* 12.0

4800 15* 12.0

5200 17* 11.9

5600 17* 11.8

6000 20* 11.6

6400 20* 11.1

6800 20* 11.0

Are these timing values acceptable and how does it compare to a pfc tuned 25 with similar mods?

The ride pulls sweet but has not been dynoed yet. No knk unless i hit that fu@ked up cut or the limiter!!!

rob82 Mentor

rob82

Posted
Posted
Afr's are approx 11:6 and ign timing @ 20* Anything more than 20* and i start to get knk on the safc2

If i pull out a few deg say -3* this now means everywhere in the band will now be decreased by 3* right?

My tuning pts are as follows:

RPM IGN AFR

2400 15* 12.4

2800 14* 12.3

3200 20* 12.1

3600 26* 12.0

4000 24* 12.0

4400 16* 12.0

4800 15* 12.0

5200 17* 11.9

5600 17* 11.8

6000 20* 11.6

6400 20* 11.1

6800 20* 11.0

Are these timing values acceptable and how does it compare to a pfc tuned 25 with similar mods?

The ride pulls sweet but has not been dynoed yet. No knk unless i hit that fu@ked up cut or the limiter!!!

You could still lean the mixtures out to 12:1 but if your getting knock then back the timing on the cas 2degs and see how you go. Are you sure the base timing is correct - be aware that you need to check the std ECU data to do it properly as it has idle ignition control - which means it varies timing based on desired idle rpm.

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