will the cobra maf just work or do i need an SAFC or some sort of control unit?
the plug is the same so will it just plug in and work?
Your computer has to know what to do with the signal.
The Cobra MAF is going to react entirely differently than the stock MAF so the computer won’t know how much air is really getting in.
yeah thats why im worried.
paired with an AEM EMS or something to control my signal it should work tho eh…
sasha im looking your way here bro
AEM EMS wont work for your car. you’re too much a gino for it.
i think u should get Megasquirt ty :lol:
Sasha I guess I shouldn’t get you the ems ehhh!!!
if IM too gino for it then it would probably enter self destruct mode if you try to hook one up.
**gino status max. self destruct in t-minus 5, 4, 3, 2… **
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will the cobra maf just work or do i need an SAFC or some sort of control unit?]
Hey, Jim Wolf Technologies … offers this set up - althought he alters the ecu mapings for the new mass air.[[/quote]
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yah man i know, but just to be sure i cut a small piece of skin off my arm and took it to a lab. it turns out that im actually NOT made of money. soooo i dont think thats an option.
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yah man i know, but just to be sure i cut a small piece of skin off my arm and took it to a lab. it turns out that im actually NOT made of money. soooo i dont think thats an option.[/quote]
:lol: :lol: good one…
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yah man i know, but just to be sure i cut a small piece of skin off my arm and took it to a lab. it turns out that im actually NOT made of money. soooo i dont think thats an option.[/quote]
you can afford an EMS but not a JWT ECU?
i dont know i basically said it as a joke.
i cant get jim wolf through PI.
whats the price on the JWT?
Get Greddy Emanage, It will run the maf or just get the boost sensor and you wont need it you can use your stock one.
Hey, the cheaper was is to hook upp an ems. Do you have an ems? If not maybe you can try this.
Use the stock MAFS sensor and hook up the ems. And instead of hooking up the MAF to the ems - make a new circuit by installing a new (or used) map sensor ( I use Honda stock map sensor - because they are good to 0.7 Bar).
I piggy back both power and ground off the tps sensor (5v and ground) to the new map sensor and run a new wire from the map sensor to the ems (note - on the ems you are suppose to wire the MAF sensor in ems an out the ems) - NO OUTPUT FROM THE EMS.
This is how I wire all my turbo cars. (ex. - I just wired up recently a 2002 Mazda Protege5 - like this )
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yah man i know, but just to be sure i cut a small piece of skin off my arm and took it to a lab. it turns out that im actually NOT made of money. soooo i dont think thats an option.[/quote]
you can afford an EMS but not a JWT ECU?[/quote]
ahem. MAPS
JWT is highway robbery. He has a basic map that he will reprogram your ECU with that allows the 85mm MAF.
But, look around. There’s a zillion posts from Nissan members saying they’ve had to send and resend their ECU to JWT time and time again, then end up using an SAFC to fix it.
Avery’s not far off … the megasquirt is a good way to go, there’s also a DIY (but already made) fuel controller from Australia that makes the SAFC look like a child’s toy. Rather than be RPM sensitive, it’s actually demand sensitive.
Either or … 85mm MAF is fricking enormous.
What does the stock SR max out at … 250hp?
I’d sooner ditch the MAF for MAP than go through the $$$ to run an 85mm MAF.
Of course there’s ghetto ways to do it with 2 x 10 kohm potentiometers … but that’s a little too ghetto.
Basically, your MAF is set with a predetermined volume. The MAF that is in your car is specific to the size of the housing it is in … this is how the calculation is made.
If you change the housing, the ECU will not compensate for the extra air.
It’s an equation if you alter one field, you have to alter the other, or the equation will turn out wrong.
So if A is the volume of the housing and B is the signal to the ECU with C being the ECUs output (to injectors).
If you increase A 30% (going from SR housing to Cobra housing, keeping SR MAF)
B must be adjusted accordingly.
So if your Housing is 30% larger, you are getting 30% more air than the ECU thinks. So the signal must be boosted to tell the ECU to add 30% more fuel.
Because the MAF signal is linear 0.1v-5v, all these values are preprogrammed into your ECU. If you are getting a reading of 1.5v and you need 30% more fuel, you would need to boost the signal by 30% as well. So your ECU will see a signal of 1.95v (1.5v + 30%). Your ECU will treat that as having a 30% increase in demand for fuel for the same air.
The formula will always remain the same, you just play with the variables.
Problem is the Cobra MAF is calibrated to itself, not your ECU. Just plugging it in will probably make your car not run at all.
This is what an SAFC (and similar) does. Using an RPM sensitive switch (think shift light) the SAFC alters the MAF signal accordingly. You input the variables (MAF, Injectors) and it fools the ECU for you.
The formula never changes, and this is what allows you to “hack” it.
In theory, you could take a MAF that is 30% larger, and as long as you coupled it with injectors that are also 30% larger, the ECU would be able to handle it.
Problem is the idle/low RPM circuit will be super rich. Again, easy enough to skirt around with an RPM switch or pressure switch or even the WOT switch from the TPS.
30% larger MAF, 30% larger injectors
Wire a potentiometer in and trim the MAF signal at idle until you get a nice idle setting.
Find a resistor that matches the same value from your potentiometer.
Then you run that resistor inline of the MAF signal.
You then run a switched bypass.
Open MAF- resitor- ECU
closed MAF - ECU
At whatever value you want, your little system will bypass the resistor altogether and give you the “full rich” mode.
You could use WOT, RPM, boost, even manual (pedal switch) to switch between them.
Ghetto … sure. If you have the time to sit down and think about it, you could easily build a fully adjustable system.
Dangerous? This one makes me laugh. You’re just as likely to blow up a motor doing this as you are trying to tune your SAFC.
Any time you’re playing with fuel, it pays to know what you’re doing.